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<h3>

Gary E. Miller pushed to branch master

at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>

</h3>

<h4>

Commits:

</h4>

<ul>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/96f0cdd7c825756863bf796f64bd0d901e4c9254">96f0cdd7</a></strong>

<div>

<span>by James Browning</span>

<i>at 2018-08-06T21:16:10Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Documentation updates

</pre>

</li>

</ul>

<h4>5 changed files:</h4>

<ul>

<li class="file-stats">

<a href="#8a07f8ef10555b2000b881e85dc86b4252e403eb">

devel/README

</a>

</li>

<li class="file-stats">

<a href="#6311c8a7ff207240e9427c5f70f5b4fcb6c8371c">

devel/hacking.txt

</a>

</li>

<li class="file-stats">

<a href="#d294410bda3341a7eeac07460e2389ff2f48ea34">

devel/ntpv5.txt

</a>

</li>

<li class="file-stats">

<a href="#64837cdcecb4698c05529359fee836d139ed2ba7">

devel/testing.txt

</a>

</li>

<li class="file-stats">

<a href="#7bb1ded6cb62df2554422eb291b61743d3759964">

devel/tour.txt

</a>

</li>

</ul>

<h4>Changes:</h4>

<li id="8a07f8ef10555b2000b881e85dc86b4252e403eb">

<a href="https://gitlab.com/NTPsec/ntpsec/commit/96f0cdd7c825756863bf796f64bd0d901e4c9254#8a07f8ef10555b2000b881e85dc86b4252e403eb"><strong>devel/README</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="20" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="20" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -20,7 +20,7 @@ ifdex-ignores::</td>

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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext">     Lists and explains a large number of internal configuration symbols.    </span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="21" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="22" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="22" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext">make-tarball::</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC23" class="line" lang="plaintext">     <span class="idiff left right">S</span>cript for building a release tarball.</span>

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<td class="diff-line-num new old_line" data-linenumber="24" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext">     <span class="idiff left right">The s</span>cript for building a release tarball.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="24" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="25" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext">ntpv5.txt::</span>

</pre>

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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext">     Design notes towards NTPv5.</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="29" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="29" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -29,7 +29,7 @@ pre-release.txt::</td>

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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext">     A collection of ideas about testing before a release.</span>

</pre>

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext">release::</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="32" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="32" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC32" class="line" lang="plaintext">     <span class="idiff left right">S</span>cript for shipping a release.</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="32" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext">     <span class="idiff left right">The s</span>cript for shipping a release.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC33" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="34" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC34" class="line" lang="plaintext">TODO::</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="35" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="35" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

35

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext">     List of items the NTPsec developers are working on.</span>

</pre>

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<br>

</li>

<li id="6311c8a7ff207240e9427c5f70f5b4fcb6c8371c">

<a href="https://gitlab.com/NTPsec/ntpsec/commit/96f0cdd7c825756863bf796f64bd0d901e4c9254#6311c8a7ff207240e9427c5f70f5b4fcb6c8371c"><strong>devel/hacking.txt</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="21" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="21" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -21,7 +21,7 @@ to a minimum.</td>

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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext">Time-critical code must be written in C. Use Python for any code that</span>

</pre>

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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext">is not time-critical, as this reduces line count and complexity (thus,</span>

</pre>

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<pre style="margin: 0;">-<span id="LC24" class="line" lang="plaintext">also, expected defect rates). If you need a NTP-specific C function</span>

</pre>

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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext">also, expected defect rates). If you need a<span class="idiff left right">n</span> NTP-specific C function</span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="25" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext">not available in Python, try to improve the libntpc extension</span>

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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext">in ../libntp/pymodule.c to expose it.</span>

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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext"></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="29" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="29" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -29,7 +29,7 @@ The only scripting language allowed and supported other than Python is</td>

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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext">POSIX sh (this is more restricted than bash!).  Python is preferred, as</span>

</pre>

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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext">it's easier to verify portability in Python than it is in sh.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="32" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC32" class="line" lang="plaintext">Please read our C and Python guidelines carefully<span class="idiff left right">. T</span>hey're not just</span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="32" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext">Please read our C and Python guidelines carefully<span class="idiff left right">; t</span>hey're not just</span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC33" class="line" lang="plaintext">about style, they're serious measures to reduce defect rates.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC34" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="35" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext">== C Guidelines ==</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="48" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="48" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -48,15 +48,15 @@ You *may* use C11-style anonymous unions.</td>

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<pre style="margin: 0;"> <span id="LC48" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext">Only POSIX-1.2001/SUSv3 library functions should be used (a few</span>

</pre>

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<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext">specific exceptions are noted below).  If a library</span>

</pre>

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<pre style="margin: 0;">-<span id="LC51" class="line" lang="plaintext">function not in that standard is required, then a wrapper function for back</span>

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<td class="diff-line-num new old_line" data-linenumber="52" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="51" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

51

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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext">function not in that standard is required, then a wrapper function for back<span class="idiff left right">ward</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="52" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

52

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<td class="diff-line-num new_line" data-linenumber="52" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

52

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC52" class="line" lang="plaintext">compatibility must be provided.  One notable case is clock_gettime()</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="53" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

53

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<td class="diff-line-num new_line" data-linenumber="53" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

53

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext">which is used, when available, for increased accuracy, and has a</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="54" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

54

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<td class="diff-line-num new_line" data-linenumber="54" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

54

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext">fallback implementation using native time calls.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="55" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

55

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<td class="diff-line-num new_line" data-linenumber="55" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

55

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC55" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="56" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

56

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<td class="diff-line-num new_line old" data-linenumber="56" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC56" class="line" lang="plaintext">You can <span class="idiff left right">view</span> POSIX-1.2001, with 2004 Corrigendum, online for free here:</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="57" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="56" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

56

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC56" class="line" lang="plaintext">You can <span class="idiff left right">read</span> POSIX-1.2001, with 2004 Corrigendum, online for free here:</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="57" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

57

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<td class="diff-line-num new_line" data-linenumber="57" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

57

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC57" class="line" lang="plaintext">    http://pubs.opengroup.org/onlinepubs/009695399/toc.htm</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="58" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

58

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<td class="diff-line-num new_line" data-linenumber="58" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

58

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC58" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="59" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

59

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<td class="diff-line-num new_line old" data-linenumber="59" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC59" class="line" lang="plaintext">You can <span class="idiff left right">view</span> POSIX.1-2001, SUSv3, online for free here:</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="60" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="59" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

59

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC59" class="line" lang="plaintext">You can <span class="idiff left right">see</span> POSIX.1-2001, SUSv3, online for free here:</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="60" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="60" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC60" class="line" lang="plaintext">    http://www.unix-systems.org/version3/</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="61" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

61

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<td class="diff-line-num new_line" data-linenumber="61" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

61

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<pre style="margin: 0;"> <span id="LC61" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="62" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="62" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC62" class="line" lang="plaintext">POSIX threads *are* considered part of the standardized API and may be used.</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="109" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="109" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -109,16 +109,16 @@ Don't use gettimeofday(2).  While this is nominally POSIX, it is</td>

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<td class="diff-line-num old_line" data-linenumber="109" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC109" class="line" lang="plaintext">deprecated and may be removed in the future.  Use clock_gettime(2)</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="110" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="110" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC110" class="line" lang="plaintext">instead.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="111" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="111" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC111" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="112" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="112" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC112" class="line" lang="plaintext">Use pselect(2) rather tha<span class="idiff left right">t</span> select(2), to avoid introducing struct</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="113" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="112" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC112" class="line" lang="plaintext">Use pselect(2) rather tha<span class="idiff left right">n</span> select(2), to avoid introducing struct</span>

</pre>

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<pre style="margin: 0;"> <span id="LC113" class="line" lang="plaintext">timeval.</span>

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<pre style="margin: 0;"> <span id="LC114" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC115" class="line" lang="plaintext">In general, avoid introducing the type struct timeval into the code,</span>

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<pre style="margin: 0;"> <span id="LC116" class="line" lang="plaintext">in favor of the higher-resolution struct timespec. Early on in</span>

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<pre style="margin: 0;">-<span id="LC117" class="line" lang="plaintext">NTPsec's history we found a bug introduced by poor data management</span>

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<td class="diff-line-num new new_line" data-linenumber="117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC117" class="line" lang="plaintext">NTPsec's history<span class="idiff left right">,</span> we found a bug introduced by poor data management</span>

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<pre style="margin: 0;"> <span id="LC118" class="line" lang="plaintext">where these two time representations bumped into each other; we don't</span>

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<pre style="margin: 0;"> <span id="LC119" class="line" lang="plaintext">want that to happen again. Thus, if you must refer to struct timeval due to</span>

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<pre style="margin: 0;"> <span id="LC120" class="line" lang="plaintext">an external interface, move the data to/from a struct timespec as</span>

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<pre style="margin: 0;">-<span id="LC121" class="line" lang="plaintext">close to that callsite as possible.</span>

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<pre style="margin: 0;">+<span id="LC121" class="line" lang="plaintext">close to that call<span class="idiff left right"> </span>site as possible.</span>

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<pre style="margin: 0;"> <span id="LC122" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC123" class="line" lang="plaintext">=== Coding style and indentation ===</span>

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<pre style="margin: 0;"> <span id="LC124" class="line" lang="plaintext"></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="128" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="128" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -128,7 +128,7 @@ likes. It's a bit archaic, but we've stuck with it to preserve</td>

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<pre style="margin: 0;"> <span id="LC128" class="line" lang="plaintext">continuity; you should, too.</span>

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<pre style="margin: 0;"> <span id="LC129" class="line" lang="plaintext"></span>

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<td class="diff-line-num old_line" data-linenumber="130" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC130" class="line" lang="plaintext">A discussion about using uncrustify to mass convert all the C sources</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="131" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC131" class="line" lang="plaintext">to a more <span class="idiff left right">modern</span> indentation and format style is ongoing.  As it will</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="131" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC131" class="line" lang="plaintext">to a more <span class="idiff left right">current</span> indentation and format style is ongoing.  As it will</span>

</pre>

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<pre style="margin: 0;"> <span id="LC132" class="line" lang="plaintext">result in a coordinated flag day in ongoing development, it will be</span>

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<pre style="margin: 0;"> <span id="LC133" class="line" lang="plaintext">carefully announced in the mailto:devel@ntpsec.org mailing list before</span>

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<pre style="margin: 0;"> <span id="LC134" class="line" lang="plaintext">being merged and pushed.</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="153" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="153" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -153,7 +153,7 @@ HAVE_*_H::</td>

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<pre style="margin: 0;"> <span id="LC153" class="line" lang="plaintext">    Guard symbol derived by configuration logic from checking</span>

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<pre style="margin: 0;"> <span id="LC154" class="line" lang="plaintext">    for the presence of a system header.  For example, the symbol</span>

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<td class="diff-line-num old_line" data-linenumber="155" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC155" class="line" lang="plaintext">    HAVE_SYS_FOOBAR_H gets defined only if waf configure detects</span>

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<td class="diff-line-num old old_line" data-linenumber="156" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC156" class="line" lang="plaintext">    the presence of <span class="idiff left right">a </span>sys/foobar.h in the system include directory.</span>

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<pre style="margin: 0;">+<span id="LC156" class="line" lang="plaintext">    the presence of sys/foobar.h in the system include directory.</span>

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<pre style="margin: 0;"> <span id="LC157" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC158" class="line" lang="plaintext">HAVE_*::</span>

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<pre style="margin: 0;"> <span id="LC159" class="line" lang="plaintext">    Without an H suffix, a HAVE symbol is set on the availability</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="168" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="168" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -168,7 +168,7 @@ NEED_*::</td>

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<pre style="margin: 0;"> <span id="LC168" class="line" lang="plaintext">OVERRIDE_*::</span>

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<pre style="margin: 0;"> <span id="LC169" class="line" lang="plaintext">    Override a default for debugging purposes. These are values</span>

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<pre style="margin: 0;"> <span id="LC170" class="line" lang="plaintext">    (buffer lengths and the like) which waf is not expected to</span>

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<pre style="margin: 0;">-<span id="LC171" class="line" lang="plaintext">    <span class="idiff left right">normally override</span> but which might need to be forced.</span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="171" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC171" class="line" lang="plaintext">    <span class="idiff left right">override normally</span> but which might need to be forced.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC172" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC173" class="line" lang="plaintext">USE_*::</span>

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<td class="diff-line-num old_line" data-linenumber="174" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC174" class="line" lang="plaintext">    Use symbols are set internally within other conditionals to</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="196" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="196" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -196,7 +196,7 @@ Do not rely on assumptions about how structure or unions are padded.</td>

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<pre style="margin: 0;"> <span id="LC196" class="line" lang="plaintext">Historically, the NTP code assumed self-alignment.  We're trying</span>

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<pre style="margin: 0;"> <span id="LC197" class="line" lang="plaintext">to eliminate that assumption, but the work isn't finished.</span>

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<pre style="margin: 0;"> <span id="LC198" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC199" class="line" lang="plaintext">Do not assume <span class="idiff left right">pointers can be cast</span> to ints, or vice-versa.  While this</span>

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<pre style="margin: 0;">+<span id="LC199" class="line" lang="plaintext">Do not assume <span class="idiff left right">you can cast pointers</span> to ints, or vice-versa.  While this</span>

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<pre style="margin: 0;"> <span id="LC200" class="line" lang="plaintext">is true on effectively all modern hardware, the code runs on some</span>

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<pre style="margin: 0;"> <span id="LC201" class="line" lang="plaintext">sufficiently old iron that this is not necessarily the case even if</span>

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<pre style="margin: 0;"> <span id="LC202" class="line" lang="plaintext">the compiler and toolchain have been modernized.</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="211" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -211,14 +211,14 @@ specify multiple module names in an import rather than going strictly</td>

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<pre style="margin: 0;"> <span id="LC211" class="line" lang="plaintext">with one per line.  The point is to encourage you to group your import</span>

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<pre style="margin: 0;"> <span id="LC212" class="line" lang="plaintext">declarations in informative ways.</span>

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<pre style="margin: 0;"> <span id="LC213" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC214" class="line" lang="plaintext">You *must* write Python code to be 'polyglot', that <span class="idiff left right">is able to</span> run</span>

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<pre style="margin: 0;">+<span id="LC214" class="line" lang="plaintext">You *must* write Python code to be 'polyglot', that <span class="idiff left right">can</span> run</span>

</pre>

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<pre style="margin: 0;"> <span id="LC215" class="line" lang="plaintext">unaltered under 2 or 3.  Practices for doing so are documented in</span>

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<pre style="margin: 0;"> <span id="LC216" class="line" lang="plaintext">detail at</span>

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<pre style="margin: 0;"> <span id="LC217" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC218" class="line" lang="plaintext">http://www.catb.org/esr/faqs/practical-python-porting/</span>

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<pre style="margin: 0;"> <span id="LC219" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC220" class="line" lang="plaintext">Note that Python 3.x versions before 3.3 had sufficiently serious</span>

</pre>

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<pre style="margin: 0;">-<span id="LC221" class="line" lang="plaintext">back-compatibility issues that trying to make them run is probably</span>

</pre>

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<pre style="margin: 0;">+<span id="LC221" class="line" lang="plaintext">back<span class="idiff left right">ward</span>-compatibility issues that trying to make them run is probably</span>

</pre>

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<pre style="margin: 0;"> <span id="LC222" class="line" lang="plaintext">doomed.  The first 3.x version under which our Python has been</span>

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<pre style="margin: 0;"> <span id="LC223" class="line" lang="plaintext">extensively tested is 3.5.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC224" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="240" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="240" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -240,15 +240,15 @@ caused many problems. The waf script is embedded in the top level of</td>

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<pre style="margin: 0;"> <span id="LC240" class="line" lang="plaintext">the distribution; run "./waf --help" or consult INSTALL for basic</span>

</pre>

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<pre style="margin: 0;"> <span id="LC241" class="line" lang="plaintext">instructions.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC242" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="243" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC243" class="line" lang="plaintext">Full waf documentation is at<span class="idiff left right">:</span> https://waf.io/</span>

</pre>

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<pre style="margin: 0;">+<span id="LC243" class="line" lang="plaintext">Full waf documentation is at https://waf.io/</span>

</pre>

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<pre style="margin: 0;"> <span id="LC244" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC245" class="line" lang="plaintext">=== Naming conventions ===</span>

</pre>

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<pre style="margin: 0;"> <span id="LC246" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="247" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="247" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC247" class="line" lang="plaintext">Every binary and script we install has an "ntp" prefix on the name<span class="idiff left right">,</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="248" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="247" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC247" class="line" lang="plaintext">Every binary and script we install has an "ntp" prefix on the name<span class="idiff left right"> </span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC248" class="line" lang="plaintext">because namespace pollution is rude.  If you write a new tool that you</span>

</pre>

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<pre style="margin: 0;"> <span id="LC249" class="line" lang="plaintext">want us to install, follow this convention.</span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="250" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC250" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="251" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="251" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC251" class="line" lang="plaintext">Generally we favor "ntp" rather than "ntp-" for consistency and to</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="252" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="251" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC251" class="line" lang="plaintext">Generally<span class="idiff left right">,</span> we favor "ntp" rather than "ntp-" for consistency and to</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="252" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="252" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC252" class="line" lang="plaintext">reduce the amount people have to type. Choose tastefully.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="253" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC253" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="254" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="254" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC254" class="line" lang="plaintext">=== Well-tempered output ===</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="256" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -256,14 +256,14 @@ reduce the amount people have to type. Choose tastefully.</td>

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<pre style="margin: 0;"> <span id="LC256" class="line" lang="plaintext">We are devotees of the Unix rule that programs should play nicely</span>

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<pre style="margin: 0;"> <span id="LC257" class="line" lang="plaintext">with other programs.  We like output formats that are simple,</span>

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<pre style="margin: 0;"> <span id="LC258" class="line" lang="plaintext">regular, and machine-parseable without ambiguity. The practical</span>

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<pre style="margin: 0;">-<span id="LC259" class="line" lang="plaintext">goal to aim at, given our choice of scripting languages, <span class="idiff left right">is</span></span>

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<td class="diff-line-num new new_line" data-linenumber="259" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC259" class="line" lang="plaintext">goal to aim at, given our choice of scripting languages, </span>

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<pre style="margin: 0;"> <span id="LC260" class="line" lang="plaintext">is to make writing script wrappers in Python easy.</span>

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<pre style="margin: 0;"> <span id="LC261" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC262" class="line" lang="plaintext">There is more than one way to arrange this.  If you can design a</span>

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<pre style="margin: 0;"> <span id="LC263" class="line" lang="plaintext">simple tabular output format, or something resembling an RFC 2822 header</span>

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<pre style="margin: 0;"> <span id="LC264" class="line" lang="plaintext">that's easy for both human eyes and programs to parse, do that.</span>

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<pre style="margin: 0;"> <span id="LC265" class="line" lang="plaintext">Besides being simple, formats like these are easily handled by either</span>

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<pre style="margin: 0;">-<span id="LC266" class="line" lang="plaintext">Python or shellscripts.</span>

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<td class="diff-line-num new new_line" data-linenumber="266" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC266" class="line" lang="plaintext">Python or shell<span class="idiff left right"> </span>scripts.</span>

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<pre style="margin: 0;"> <span id="LC267" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC268" class="line" lang="plaintext">Such simplicity is often difficult or impractical for heterogeneous</span>

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<pre style="margin: 0;"> <span id="LC269" class="line" lang="plaintext">data that needs to be both grouped and labeled, so we have another</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="272" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="272" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -272,7 +272,7 @@ convention for those cases. Here it is:</td>

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<pre style="margin: 0;"> <span id="LC272" class="line" lang="plaintext">[quote]</span>

</pre>

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<pre style="margin: 0;"> <span id="LC273" class="line" lang="plaintext">Wherever it is reasonable, tools that generate complex reports to</span>

</pre>

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<pre style="margin: 0;"> <span id="LC274" class="line" lang="plaintext">standard output should be able to emit two formats. The default can be</span>

</pre>

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<pre style="margin: 0;">-<span id="LC275" class="line" lang="plaintext">relatively unstructured multiline text for human eyeballs. There</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="276" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="275" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC275" class="line" lang="plaintext"><span class="idiff left right">[a] </span>relatively unstructured multiline text for human eyeballs. There</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="276" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC276" class="line" lang="plaintext">should also be a -j/--json option that emits a self-describing JSON</span>

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<td class="diff-line-num old_line" data-linenumber="277" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC277" class="line" lang="plaintext">object.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC278" class="line" lang="plaintext"></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="284" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="284" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -284,7 +284,7 @@ and no JSON option, it is quite likely to be rejected.</td>

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<pre style="margin: 0;"> <span id="LC284" class="line" lang="plaintext">Our preferred format for dates is RFC 3339 (a version of ISO 8601 for</span>

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<pre style="margin: 0;"> <span id="LC285" class="line" lang="plaintext">UTC with some options frozen; full year required, medial T required,</span>

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<pre style="margin: 0;"> <span id="LC286" class="line" lang="plaintext">explicit Zulu timezone). Local times should be expressed in ISO 8601,</span>

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<pre style="margin: 0;">-<span id="LC287" class="line" lang="plaintext">always with full 4-digit year.</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="288" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="287" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC287" class="line" lang="plaintext">always with <span class="idiff left right">the </span>full 4-digit year.</span>

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<pre style="margin: 0;"> <span id="LC288" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC289" class="line" lang="plaintext">=== Copyrights and licenses ===</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="290" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC290" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="308" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="308" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -308,7 +308,7 @@ When you create a new file, mark it as follows (updating the year)</td>

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<pre style="margin: 0;"> <span id="LC308" class="line" lang="plaintext">as required:</span>

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<td class="diff-line-num old_line" data-linenumber="309" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC309" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC310" class="line" lang="plaintext">------------------------------------------------</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="311" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC311" class="line" lang="plaintext">/* Copyright 201<span class="idiff left right">7</span> by the NTPsec project contributors</span>

</pre>

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<pre style="margin: 0;">+<span id="LC311" class="line" lang="plaintext">/* Copyright 201<span class="idiff left right">8</span> by the NTPsec project contributors</span>

</pre>

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<pre style="margin: 0;"> <span id="LC312" class="line" lang="plaintext"> * SPDX-License-Identifier: BSD-2-Clause</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="313" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC313" class="line" lang="plaintext"> */</span>

</pre>

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<pre style="margin: 0;"> <span id="LC314" class="line" lang="plaintext">------------------------------------------------</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="316" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="316" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -316,7 +316,7 @@ as required:</td>

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<td class="diff-line-num new_line" data-linenumber="316" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC316" class="line" lang="plaintext">For documentation:</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="317" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="317" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC317" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="318" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="318" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC318" class="line" lang="plaintext">------------------------------------------------</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="319" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="319" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC319" class="line" lang="plaintext">// Copyright 201<span class="idiff left right">7</span> by the NTPsec project contributors</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="320" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="319" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC319" class="line" lang="plaintext">// Copyright 201<span class="idiff left right">8</span> by the NTPsec project contributors</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="320" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="320" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC320" class="line" lang="plaintext">// SPDX-License-Identifier: CC-BY-4.0</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="321" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="321" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC321" class="line" lang="plaintext">------------------------------------------------</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="322" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="322" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC322" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="328" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="328" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -328,11 +328,11 @@ When you modify a file, leave existing copyright markings in place -</td>

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<td class="diff-line-num new_line" data-linenumber="328" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC328" class="line" lang="plaintext">especially all references to Dr. Dave Mills, to Mr. Harlan Stenn, and</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="329" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="329" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC329" class="line" lang="plaintext">to the Network Time Foundation.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="330" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="330" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC330" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="331" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="331" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC331" class="line" lang="plaintext">You *may* add <span class="idiff left right">a </span>project copyright and replace the inline license</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="332" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="331" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC331" class="line" lang="plaintext">You *may* add project copyright and replace the inline license</span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="332" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="332" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC332" class="line" lang="plaintext">with an SPDX tag. For example:</span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="333" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

333

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<td class="diff-line-num new_line" data-linenumber="333" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC333" class="line" lang="plaintext"></span>

</pre>

</td>

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<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="334" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="334" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC334" class="line" lang="plaintext">------------------------------------------------</span>

</pre>

</td>

</tr>

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<td class="diff-line-num old old_line" data-linenumber="335" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="335" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC335" class="line" lang="plaintext">/* Copyright 201<span class="idiff left right">7</span> by the NTPsec project contributors</span>

</pre>

</td>

</tr>

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<td class="diff-line-num new old_line" data-linenumber="336" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="335" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC335" class="line" lang="plaintext">/* Copyright 201<span class="idiff left right">8</span> by the NTPsec project contributors</span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="336" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="336" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC336" class="line" lang="plaintext"> * SPDX-License-Identifier: NTP</span>

</pre>

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<pre style="margin: 0;"> <span id="LC337" class="line" lang="plaintext"> */</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="338" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC338" class="line" lang="plaintext">------------------------------------------------</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="347" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="347" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -347,7 +347,7 @@ before moving.</td>

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<td class="diff-line-num old_line" data-linenumber="347" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

347

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<td class="diff-line-num new_line" data-linenumber="347" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC347" class="line" lang="plaintext">When you change anything user-visible, you are expected to update the</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="348" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="348" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC348" class="line" lang="plaintext">relevant documentation *in the same commit*.  No exceptions.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="349" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

349

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<td class="diff-line-num new_line" data-linenumber="349" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC349" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="350" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="350" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC350" class="line" lang="plaintext">Otherwise we'd have to inflict long, tedious document reviews on</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="351" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="350" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC350" class="line" lang="plaintext">Otherwise<span class="idiff left right">,</span> we'd have to inflict long, tedious document reviews on</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="351" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

351

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<td class="diff-line-num new_line" data-linenumber="351" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

351

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC351" class="line" lang="plaintext">everybody. Nobody wants that.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="352" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

352

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<td class="diff-line-num new_line" data-linenumber="352" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC352" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="353" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

353

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<td class="diff-line-num new_line" data-linenumber="353" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC353" class="line" lang="plaintext">=== Documentation format and structure ===</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="379" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="379" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -379,14 +379,14 @@ that appears on a man page.</td>

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<td class="diff-line-num old_line" data-linenumber="379" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="379" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC379" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="380" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="380" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC380" class="line" lang="plaintext">=== Version number ===</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="381" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="381" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC381" class="line" lang="plaintext"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="382" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

382

</td>

<td class="diff-line-num new_line old" data-linenumber="382" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC382" class="line" lang="plaintext">We use a variant of three<span class="idiff left right"> </span>part Semantic Versioning, of the form X.Y.Z.</span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="383" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="382" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC382" class="line" lang="plaintext">We use a variant of three<span class="idiff left right">-</span>part Semantic Versioning, of the form X.Y.Z.</span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="383" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

383

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<td class="diff-line-num new_line" data-linenumber="383" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

383

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC383" class="line" lang="plaintext">X, Y, and Z are non-negative decimal integers.</span>

</pre>

</td>

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<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="384" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

384

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<td class="diff-line-num new_line" data-linenumber="384" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

384

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC384" class="line" lang="plaintext"></span>

</pre>

</td>

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<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="385" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

385

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<td class="diff-line-num new_line" data-linenumber="385" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

385

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC385" class="line" lang="plaintext">X is the "major" version number.</span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="386" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

386

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<td class="diff-line-num new_line" data-linenumber="386" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

386

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC386" class="line" lang="plaintext">Y is the "minor" version number.</span>

</pre>

</td>

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<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="387" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

387

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<td class="diff-line-num new_line" data-linenumber="387" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

387

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC387" class="line" lang="plaintext">Z is the "revision" number.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="388" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

388

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<td class="diff-line-num new_line" data-linenumber="388" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

388

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<pre style="margin: 0;"> <span id="LC388" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="389" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

389

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<td class="diff-line-num new_line old" data-linenumber="389" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC389" class="line" lang="plaintext">Each release will result in an incremented version number<span class="idiff left right">,</span> and the</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="390" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="389" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

389

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC389" class="line" lang="plaintext">Each release will result in an incremented version number and the</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="390" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

390

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<td class="diff-line-num new_line" data-linenumber="390" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

390

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<pre style="margin: 0;"> <span id="LC390" class="line" lang="plaintext">version number string will be tagged into the git repository.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="391" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

391

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<td class="diff-line-num new_line" data-linenumber="391" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

391

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<pre style="margin: 0;"> <span id="LC391" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="392" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

392

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<td class="diff-line-num new_line" data-linenumber="392" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

392

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC392" class="line" lang="plaintext">We have dropped even/odd minor version number stable/development</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="447" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="447" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -447,8 +447,8 @@ Our GitLab group is at https://gitlab.com/groups/NTPsec</td>

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<td class="diff-line-num old_line" data-linenumber="447" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

447

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<td class="diff-line-num new_line" data-linenumber="447" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

447

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<pre style="margin: 0;"> <span id="LC447" class="line" lang="plaintext">Please use the issue tracker and the pull request process at GitLab.com.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="448" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

448

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<td class="diff-line-num new_line" data-linenumber="448" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

448

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC448" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="449" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

449

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<td class="diff-line-num new_line" data-linenumber="449" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

449

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<pre style="margin: 0;"> <span id="LC449" class="line" lang="plaintext">If you wish, you can request to join the GitLab project team at</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="450" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

450

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<td class="diff-line-num new_line old" data-linenumber="450" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC450" class="line" lang="plaintext">https://gitlab.com/groups/NTPsec/group_members and we will add you to the</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="451" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

451

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<td class="diff-line-num new_line old" data-linenumber="450" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC451" class="line" lang="plaintext">team with Guest access<span class="idiff left right">.  T</span>his will cause GitLab to send issue tracker</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="452" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="450" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

450

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC450" class="line" lang="plaintext">https://gitlab.com/groups/NTPsec/group_members<span class="idiff left right">,</span> and we will add you to the</span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="452" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="451" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

451

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC451" class="line" lang="plaintext">team with Guest access<span class="idiff left right">; t</span>his will cause GitLab to send issue tracker</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="452" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

452

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<td class="diff-line-num new_line" data-linenumber="452" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

452

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC452" class="line" lang="plaintext">updates and pipeline updates to your email address.  You do not have</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="453" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

453

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<td class="diff-line-num new_line" data-linenumber="453" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

453

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC453" class="line" lang="plaintext">to formally be a member of the GitLab team to participate, contribute,</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="454" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

454

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<td class="diff-line-num new_line" data-linenumber="454" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

454

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC454" class="line" lang="plaintext">or send issues, patches, or pull requests.</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="470" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="470" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -470,13 +470,13 @@ at least send context (-c) or unified (-u) diffs rather than the</td>

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<td class="diff-line-num old_line" data-linenumber="470" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

470

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<td class="diff-line-num new_line" data-linenumber="470" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

470

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC470" class="line" lang="plaintext">default ed (-e) style, which is very brittle.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="471" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

471

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<td class="diff-line-num new_line" data-linenumber="471" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

471

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC471" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="472" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

472

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<td class="diff-line-num new_line" data-linenumber="472" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

472

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<pre style="margin: 0;"> <span id="LC472" class="line" lang="plaintext">You can email your patch to mailto:devel@ntpsec.org if you are a member of</span>

</pre>

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<pre style="margin: 0;">-<span id="LC473" class="line" lang="plaintext">that mailing list<span class="idiff left right">,</span> or you can email your patch to</span>

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<pre style="margin: 0;">+<span id="LC473" class="line" lang="plaintext">that mailing list or you can email your patch to</span>

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<pre style="margin: 0;"> <span id="LC474" class="line" lang="plaintext">mailto:contact@ntpsec.org if you are not.</span>

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<pre style="margin: 0;"> <span id="LC475" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC476" class="line" lang="plaintext">Please make sure your "From:" header in the email is correct, as that</span>

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<pre style="margin: 0;">-<span id="LC477" class="line" lang="plaintext">is what will be used as attribution of the commit.</span>

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<pre style="margin: 0;">+<span id="LC477" class="line" lang="plaintext">is what will be used as <span class="idiff left right">the </span>attribution of the commit.</span>

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<pre style="margin: 0;"> <span id="LC478" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC479" class="line" lang="plaintext">The <span class="idiff left right">person on the team that merges in</span> your patch will use the git</span>

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<pre style="margin: 0;">+<span id="LC479" class="line" lang="plaintext">The <span class="idiff left right">team member who merges</span> your patch will use the git</span>

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<pre style="margin: 0;"> <span id="LC480" class="line" lang="plaintext">parameter ---author from the email From header and the git parameter</span>

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<pre style="margin: 0;"> <span id="LC481" class="line" lang="plaintext">--date from the email Date header.</span>

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<pre style="margin: 0;"> <span id="LC482" class="line" lang="plaintext"></span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -503,7 +503,7 @@ should consist of:</td>

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<pre style="margin: 0;"> <span id="LC503" class="line" lang="plaintext">  git format-patch. Bulleted list items are also OK.</span>

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<pre style="margin: 0;"> <span id="LC504" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC505" class="line" lang="plaintext">* In some cases it may be appropriate to end your summary line with a comma</span>

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<pre style="margin: 0;">-<span id="LC506" class="line" lang="plaintext">  or ellipsis ("...") to indicate that it runs directly into <span class="idiff left right">a</span> following</span>

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<pre style="margin: 0;">+<span id="LC506" class="line" lang="plaintext">  or ellipsis ("...") to indicate that it runs directly into <span class="idiff left right">the</span> following</span>

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<pre style="margin: 0;"> <span id="LC507" class="line" lang="plaintext">  paragraph. You should still try to make the summary self-contained when</span>

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<pre style="margin: 0;"> <span id="LC508" class="line" lang="plaintext">  you do this.</span>

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<pre style="margin: 0;"> <span id="LC509" class="line" lang="plaintext"></span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -517,14 +517,14 @@ change and you can easily fit it in the summary line along with your</td>

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<pre style="margin: 0;"> <span id="LC517" class="line" lang="plaintext">summary.</span>

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<pre style="margin: 0;"> <span id="LC518" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC519" class="line" lang="plaintext">Yes, we know the pre-git portions of the history violate some of these.</span>

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<pre style="margin: 0;">-<span id="LC520" class="line" lang="plaintext">That was then<span class="idiff left right">,</span> this is now.</span>

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<pre style="margin: 0;">+<span id="LC520" class="line" lang="plaintext">That was then<span class="idiff left right">;</span> this is now.</span>

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<pre style="margin: 0;"> <span id="LC521" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC522" class="line" lang="plaintext">=== How to refer to previous commits ===</span>

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<pre style="margin: 0;"> <span id="LC523" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC524" class="line" lang="plaintext">The best (most human-friendly) way to reference a commit is by quoting its</span>

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<pre style="margin: 0;">-<span id="LC525" class="line" lang="plaintext">summary line<span class="idiff left right">.  I</span>f you need to disambiguate, give its date and author.</span>

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<pre style="margin: 0;">+<span id="LC525" class="line" lang="plaintext">summary line<span class="idiff left right">; i</span>f you need to disambiguate, give its date and author.</span>

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<pre style="margin: 0;"> <span id="LC526" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC527" class="line" lang="plaintext">The worst way is to quote its git hash<span class="idiff left right">,</span> because humans are not good at</span>

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<pre style="margin: 0;">+<span id="LC527" class="line" lang="plaintext">The worst way is to quote its git hash because humans are not good at</span>

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<pre style="margin: 0;"> <span id="LC528" class="line" lang="plaintext">keeping random strings of hex digits in working memory.  Besides, hashes</span>

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<pre style="margin: 0;"> <span id="LC529" class="line" lang="plaintext">will break if the history is ever moved to another VCS or the repository</span>

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<pre style="margin: 0;"> <span id="LC530" class="line" lang="plaintext">has to be surgically altered.</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="539" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="539" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -539,7 +539,7 @@ of the bubble commute cleanly, but the developer on one side or the other</td>

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<pre style="margin: 0;"> <span id="LC539" class="line" lang="plaintext">forgot to rebase so his commit would be a fast-forward.</span>

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<pre style="margin: 0;"> <span id="LC540" class="line" lang="plaintext"></span>

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541

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541

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<pre style="margin: 0;"> <span id="LC541" class="line" lang="plaintext">We strongly dislike unnecessary merge bubbles.  They make the</span>

</pre>

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542

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<td class="diff-line-num new_line old" data-linenumber="542" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC542" class="line" lang="plaintext">repository history <span class="idiff left right">difficult</span> to read, and can make bisection tests</span>

</pre>

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542

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC542" class="line" lang="plaintext">repository history <span class="idiff left right">hard</span> to read, and can make bisection tests</span>

</pre>

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543

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<pre style="margin: 0;"> <span id="LC543" class="line" lang="plaintext">trickier. We prefer the code to have a simple, close-to-linear</span>

</pre>

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544

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<pre style="margin: 0;"> <span id="LC544" class="line" lang="plaintext">history even if that means older commits are sometimes fast-forwarded</span>

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545

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<pre style="margin: 0;"> <span id="LC545" class="line" lang="plaintext">from new ones because a long-lived branch was rebased.</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="556" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="556" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -556,8 +556,8 @@ local commits on the new tip.  You may find it helpful to set</td>

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<pre style="margin: 0;"> <span id="LC556" class="line" lang="plaintext">    rebase = true</span>

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<pre style="margin: 0;"> <span id="LC557" class="line" lang="plaintext">-------------------------------------------------------------</span>

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558

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<pre style="margin: 0;"> <span id="LC558" class="line" lang="plaintext"></span>

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<td class="diff-line-num new_line old" data-linenumber="559" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC559" class="line" lang="plaintext">Setting this option adds --rebase to all your pulls<span class="idiff left right">.  T</span>his may cause</span>

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<td class="diff-line-num new_line old" data-linenumber="559" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC560" class="line" lang="plaintext">minor inconvenience when you have uncommitted local changes; you</span>

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<pre style="margin: 0;">+<span id="LC559" class="line" lang="plaintext">Setting this option adds --rebase to all your pulls<span class="idiff left right">; t</span>his may cause</span>

</pre>

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC560" class="line" lang="plaintext"><span class="idiff left right">a </span>minor inconvenience when you have uncommitted local changes; you</span>

</pre>

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<pre style="margin: 0;"> <span id="LC561" class="line" lang="plaintext">should be able to use "git stash" to get around that.</span>

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<td class="diff-line-num new_line" data-linenumber="562" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC562" class="line" lang="plaintext"></span>

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC563" class="line" lang="plaintext">== Logging tags ==</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="602" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="602" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -602,7 +602,7 @@ each release.</td>

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<td class="diff-line-num old_line" data-linenumber="602" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="602" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC602" class="line" lang="plaintext">. Modify the .../VERSION file with the new version number.</span>

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<td class="diff-line-num new_line" data-linenumber="603" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC603" class="line" lang="plaintext">  Version number strings look like "1.1.1"</span>

</pre>

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<pre style="margin: 0;"> <span id="LC604" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC605" class="line" lang="plaintext">. Modify the .../NEWS file, changing the "Repository head"<span class="idiff left right">.</span></span>

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<pre style="margin: 0;">+<span id="LC605" class="line" lang="plaintext">. Modify the .../NEWS file, changing the "Repository head"</span>

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606

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606

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<pre style="margin: 0;"> <span id="LC606" class="line" lang="plaintext">  to the current date and the version string.</span>

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607

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607

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<pre style="margin: 0;"> <span id="LC607" class="line" lang="plaintext"></span>

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608

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<pre style="margin: 0;"> <span id="LC608" class="line" lang="plaintext">. Run the "release" script in this (devel) directory.</span>

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<br>

</li>

<li id="d294410bda3341a7eeac07460e2389ff2f48ea34">

<a href="https://gitlab.com/NTPsec/ntpsec/commit/96f0cdd7c825756863bf796f64bd0d901e4c9254#d294410bda3341a7eeac07460e2389ff2f48ea34"><strong>devel/ntpv5.txt</strong></a>

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1

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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext">= Preliminary design notes for the NTPv5 protocol =</span>

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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext">NTPv4 is showing its age.  There are functional capabilities that</span>

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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext">would be very useful if they could be standardized<span class="idiff left right">,</span> but</span>

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">would be very useful if they could be standardized but</span>

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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext">currently are not.</span>

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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext">This document will first list these missing bits, then discuss</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="14" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="14" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -14,8 +14,8 @@ ways to incorporate them.</td>

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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext">Reference IDs are used by Stratum 1 sources to identify clocks and</span>

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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext">clock types, and by hosts at higher strata to perform loop detection.</span>

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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC17" class="line" lang="plaintext">The REFID field is <span class="idiff left right">4</span> octets long, sufficient to hold an IPv4 address</span>

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<td class="diff-line-num new_line old" data-linenumber="17" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext">for loop detection<span class="idiff left right">. T</span>his is inadequate for IPv6, so the reference ID of</span>

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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext">The REFID field is <span class="idiff left right">four</span> octets long, sufficient to hold an IPv4 address</span>

</pre>

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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">for loop detection<span class="idiff left right">; t</span>his is inadequate for IPv6, so the reference ID of</span>

</pre>

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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext">an IPv6 host is a 4-octet hash of its actual address. Hash collisions</span>

</pre>

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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext">have been observed in the wild, possibly resulting in false-positive</span>

</pre>

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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext">loop detection.</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="29" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="29" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -29,7 +29,7 @@ Most servers ship UTC.  Some ship TAI. Some perform leap-second</td>

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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext">smearing, some do not.</span>

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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext">The new protocol should enable a server to advertise its timescale,</span>

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<pre style="margin: 0;">-<span id="LC32" class="line" lang="plaintext">including, if applicable in its timescale, its current leapsecond offset.</span>

</pre>

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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext">including, if applicable in its timescale, its current leap<span class="idiff left right"> </span>second offset.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC33" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC34" class="line" lang="plaintext">=== Era ===</span>

</pre>

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<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="61" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="61" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -61,12 +61,12 @@ not incremented; "v5" becomes a set of required extension blocks.</td>

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<pre style="margin: 0;"> <span id="LC61" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC62" class="line" lang="plaintext">A difficulty with this approach is that some firewalls and routers are</span>

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<pre style="margin: 0;"> <span id="LC63" class="line" lang="plaintext">known to silently discard RFC7822 extension blocks as a way of</span>

</pre>

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<pre style="margin: 0;">-<span id="LC64" class="line" lang="plaintext">preventing DoS attacks<span class="idiff left right">.  T</span>his would create propagation issues</span>

</pre>

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<pre style="margin: 0;">+<span id="LC64" class="line" lang="plaintext">preventing DoS attacks<span class="idiff left right">; t</span>his would create propagation issues</span>

</pre>

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<pre style="margin: 0;"> <span id="LC65" class="line" lang="plaintext">difficult to diagnose.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC66" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC67" class="line" lang="plaintext">=== NTPNG ===</span>

</pre>

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<pre style="margin: 0;"> <span id="LC68" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC69" class="line" lang="plaintext">In this approach, a new port number is allocated. The protocol<span class="idiff left right"> is</span></span>

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<pre style="margin: 0;">+<span id="LC69" class="line" lang="plaintext">In this approach, a new port number is allocated. The protocol</span>

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<pre style="margin: 0;"> <span id="LC70" class="line" lang="plaintext">design is unconstrained except that it must carry the semantic</span>

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<pre style="margin: 0;"> <span id="LC71" class="line" lang="plaintext">content of the v4 header minus the unused Reference Timestamp</span>

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<pre style="margin: 0;"> <span id="LC72" class="line" lang="plaintext">field.</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="81" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="81" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -81,7 +81,7 @@ the first byte of the v4 packet header structure, so that the version</td>

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<pre style="margin: 0;"> <span id="LC81" class="line" lang="plaintext">number and packet mode are at the same offset as in v4. The version</span>

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<pre style="margin: 0;"> <span id="LC82" class="line" lang="plaintext">field *is* incremented to 5.</span>

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<pre style="margin: 0;"> <span id="LC83" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC84" class="line" lang="plaintext">The following payload <span class="idiff left right">is </span>design is unconstrained except that it must</span>

</pre>

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<pre style="margin: 0;">+<span id="LC84" class="line" lang="plaintext">The following payload design is unconstrained except that it must</span>

</pre>

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<pre style="margin: 0;"> <span id="LC85" class="line" lang="plaintext">carry the semantic content of the v4 header minus the unused Reference</span>

</pre>

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<pre style="margin: 0;"> <span id="LC86" class="line" lang="plaintext">Timestamp field.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC87" class="line" lang="plaintext"></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -117,7 +117,7 @@ A chunk system appropriate for NTP can be summarized as follows:</td>

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<pre style="margin: 0;"> <span id="LC117" class="line" lang="plaintext">* If the first character is not uppercase, the chunk is non-critical</span>

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<pre style="margin: 0;"> <span id="LC118" class="line" lang="plaintext">  and may be skipped.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC119" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC120" class="line" lang="plaintext">* Chunk content is not constrained and is interpreted based <span class="idiff left right">i</span>n the</span>

</pre>

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<pre style="margin: 0;">+<span id="LC120" class="line" lang="plaintext">* Chunk content is not constrained and is interpreted based <span class="idiff left right">o</span>n the</span>

</pre>

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<pre style="margin: 0;"> <span id="LC121" class="line" lang="plaintext">  chunk type.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC122" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC123" class="line" lang="plaintext">Note that this is not identical to PNG chunk layout; one difference is</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="135" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="135" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -135,10 +135,10 @@ worthwhile would incorporate at least most of the following:</td>

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<pre style="margin: 0;"> <span id="LC135" class="line" lang="plaintext">something that runs over HTTPS on the NTS-KE port.</span>

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<pre style="margin: 0;"> <span id="LC136" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC137" class="line" lang="plaintext">2. Let client and server packets be formatted differently. Achieve</span>

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<pre style="margin: 0;">-<span id="LC138" class="line" lang="plaintext">data minimization by just taking <span class="idiff left right">the unnecessary fields out of client</span></span>

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<pre style="margin: 0;">+<span id="LC138" class="line" lang="plaintext">data minimization by just taking <span class="idiff left right">unnecessary fields out of client </span></span>

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<pre style="margin: 0;"> <span id="LC139" class="line" lang="plaintext">packets altogether.</span>

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<pre style="margin: 0;"> <span id="LC140" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC141" class="line" lang="plaintext">3. Forbid use of the legacy MAC field, thus fixing the hairiness</span>

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<pre style="margin: 0;">+<span id="LC141" class="line" lang="plaintext">3. Forbid <span class="idiff left right">the </span>use of the legacy MAC field, thus fixing the hairiness</span>

</pre>

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<pre style="margin: 0;"> <span id="LC142" class="line" lang="plaintext">around extension parsing.</span>

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<pre style="margin: 0;"> <span id="LC143" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC144" class="line" lang="plaintext">4. Make NTS mandatory. In the NTPv5 packet format, the version, mode,</span>

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<br>

</li>

<li id="64837cdcecb4698c05529359fee836d139ed2ba7">

<a href="https://gitlab.com/NTPsec/ntpsec/commit/96f0cdd7c825756863bf796f64bd0d901e4c9254#64837cdcecb4698c05529359fee836d139ed2ba7"><strong>devel/testing.txt</strong></a>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -16,14 +16,14 @@ that says</td>

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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext">ntpq: can't find Python NTP library -- check PYTHONPATH.</span>

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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext">---------------------------------------------------------------------</span>

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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC19" class="line" lang="plaintext"><span class="idiff left right">y</span>ou *may* have a problem.  A lot of what was C code in legacy versions</span>

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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"><span class="idiff left right">Y</span>ou *may* have a problem.  A lot of what was C code in legacy versions</span>

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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext">(pretty much everything except ntpd itself, in fact) has been moved to</span>

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<td class="diff-line-num new_line old" data-linenumber="21" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC21" class="line" lang="plaintext">Python <span class="idiff left right">in order </span>to improve maintainability and decrease attack</span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="21" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

21

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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext">Python to improve maintainability and decrease attack</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="22" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext">surface.  Most of these tools share a Python library of critical</span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext">functions.  If you can't load that library, you can't test effectively.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext"></span>

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext">The waf build is supposed to create a symbolic link from</span>

</pre>

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<pre style="margin: 0;">-<span id="LC26" class="line" lang="plaintext">build/main/ntpclients/ntp to pylib in the build directory<span class="idiff left right">. T</span>his should enable</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="27" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext">build/main/ntpclients/ntp to pylib in the build directory<span class="idiff left right">; t</span>his should enable</span>

</pre>

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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext">ntpq to "import ntp" before you install to rootspace. If that link is not</span>

</pre>

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<pre style="margin: 0;"> <span id="LC28" class="line" lang="plaintext">created or doesn't point to pylib/ under your build directory, report</span>

</pre>

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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext">this as a bug. If it is, but ./ntpq startup fails anyway, you may</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="40" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="40" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -40,7 +40,7 @@ report it as a bug.</td>

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<td class="diff-line-num old_line" data-linenumber="40" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC40" class="line" lang="plaintext">Be aware that if this sort of problem occurs in an NTPsec instance</span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="41" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext">installed from a binary package, it is almost certainly not an NTPsec</span>

</pre>

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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext">bug but a packaging error that the NTPsec maintainers themselves can't</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="43" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="43" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC43" class="line" lang="plaintext">fix. In that case you need to report it to your distribution</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="44" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext">fix. In that case<span class="idiff left right">,</span> you need to report it to your distribution</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="44" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="44" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC44" class="line" lang="plaintext">maintainers.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="45" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="46" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext">== Preliminary one-off test ==</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="64" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="64" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -64,7 +64,7 @@ Run "ntpq -p" to see if things look normal.</td>

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64

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<pre style="margin: 0;"> <span id="LC64" class="line" lang="plaintext"></span>

</pre>

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65

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<pre style="margin: 0;"> <span id="LC65" class="line" lang="plaintext">== Full qualification test ==</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="66" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

66

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<pre style="margin: 0;"> <span id="LC66" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="67" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC67" class="line" lang="plaintext">For a longer test, including over reboots.<span class="idiff left right">..</span></span>

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<td class="diff-line-num new old_line" data-linenumber="68" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="67" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC67" class="line" lang="plaintext">For a longer test, including over reboots.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="68" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC68" class="line" lang="plaintext"></span>

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<td class="diff-line-num old_line" data-linenumber="69" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="69" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC69" class="line" lang="plaintext">Install your new code using "./waf install" (as root).</span>

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<td class="diff-line-num old_line" data-linenumber="70" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC70" class="line" lang="plaintext">That will install your new ntpd into /usr/local/sbin/ntpd</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="87" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="87" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -87,7 +87,7 @@ Note that under Fedora and CentOS, "dnf update" may undo that edit</td>

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<pre style="margin: 0;"> <span id="LC87" class="line" lang="plaintext">and revert to running the system version.</span>

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<pre style="margin: 0;"> <span id="LC88" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC89" class="line" lang="plaintext">Older versions used /etc/rc.d/init.d/ntpd. The file /etc/sysconfig/ntpd</span>

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<pre style="margin: 0;">-<span id="LC90" class="line" lang="plaintext">gets sourced into the init script so you can put real code in there</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="90" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC90" class="line" lang="plaintext">gets sourced into the init script so you can put <span class="idiff left right">the </span>real code in there</span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC91" class="line" lang="plaintext">(systemd doesn't do that)  You can insert this:</span>

</pre>

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<pre style="margin: 0;"> <span id="LC92" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="93" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC93" class="line" lang="plaintext">--------------------------------------------------</span>

</pre>

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<br>

</li>

<li id="7bb1ded6cb62df2554422eb291b61743d3759964">

<a href="https://gitlab.com/NTPsec/ntpsec/commit/96f0cdd7c825756863bf796f64bd0d901e4c9254#7bb1ded6cb62df2554422eb291b61743d3759964"><strong>devel/tour.txt</strong></a>

<hr>

<table class="code white" style="font-family: monospace; font-size: 90%;" bgcolor="#fff" width="100%" cellpadding="0" cellspacing="0">

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="17" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="17" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -17,9 +17,9 @@ a higher-level view than individual comments.</td>

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<td class="diff-line-num old_line" data-linenumber="17" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

17

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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext"></span>

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<td class="diff-line-num old_line" data-linenumber="18" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="18" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext">=== l_fp, s_fp, u_fp ===</span>

</pre>

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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext"></span>

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<td class="diff-line-num new_line old" data-linenumber="20" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext">C doesn't have any native fixed-point types, only float types. <span class="idiff left right"> In</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC21" class="line" lang="plaintext"><span class="idiff left right">order t</span>o do certain time calculations without loss of precision, NTP</span>

</pre>

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<pre style="margin: 0;">-<span id="LC22" class="line" lang="plaintext">home-brews three fixed-point types of its own.  Of these l_fp is the</span>

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<td class="diff-line-num new old_line" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="20" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext">C doesn't have any native fixed-point types, only float types. </span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"><span class="idiff left right">T</span>o do certain time calculations without loss of precision, NTP</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="22" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext">home-brews three fixed-point types of its own.  Of these<span class="idiff left right">,</span> l_fp is the</span>

</pre>

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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext">most common, with 32 bits of precision in both integer and fractional</span>

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<td class="diff-line-num new_line" data-linenumber="24" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext">parts. Gory details are in include/ntp_fp.h.</span>

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<td class="diff-line-num old_line" data-linenumber="25" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext"></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="32" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="32" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -32,24 +32,24 @@ become an l_fp.  For most calculations with l_fp it's easier to</td>

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<pre style="margin: 0;"> <span id="LC32" class="line" lang="plaintext">envision it as a 64bit integer that represents time with a unit of</span>

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<pre style="margin: 0;"> <span id="LC33" class="line" lang="plaintext">2^-32s, slightly short of 233 ps.</span>

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<pre style="margin: 0;"> <span id="LC34" class="line" lang="plaintext"></span>

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<td class="diff-line-num old old_line" data-linenumber="35" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="35" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC35" class="line" lang="plaintext">When used to represent dates internally an l_fp must be interpreted <span class="idiff left right">in</span></span>

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<td class="diff-line-num new_line old" data-linenumber="35" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC36" class="line" lang="plaintext">relati<span class="idiff left right">on</span> to the NTP era (the left 32 bits of the integer part of the</span>

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<td class="diff-line-num new old_line" data-linenumber="37" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="35" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext">When used to represent dates internally an l_fp must be interpreted </span>

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<td class="diff-line-num new old_line" data-linenumber="37" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="36" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC36" class="line" lang="plaintext">relati<span class="idiff left right">ve</span> to the NTP era (the left 32 bits of the integer part of the</span>

</pre>

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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext">NTP date that got cut off).  The NTP prime epoch (or epoch 0) is then</span>

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<td class="diff-line-num old_line" data-linenumber="38" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext">an *unsigned* number of seconds since 1900-01-01T00:00:00Z and</span>

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<pre style="margin: 0;">-<span id="LC39" class="line" lang="plaintext">unsigned decimal fractional seconds<span class="idiff left right">.  Just to complicate matters,</span></span>

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<td class="diff-line-num new_line old" data-linenumber="39" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC40" class="line" lang="plaintext"><span class="idiff left right">h</span>owever, some uses of l_fp are time offsets with a signed seconds</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="41" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="39" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC39" class="line" lang="plaintext">unsigned decimal fractional seconds<span class="idiff left right">, just to complicate matters.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="41" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="40" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext"><span class="idiff left right">H</span>owever, some uses of l_fp are time offsets with a signed seconds</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="41" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

41

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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext">part.  Under the assumption that only adjacent epochs get compared,</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="42" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="42" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext">the offset calculations work correctly without taking the era number</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="43" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC43" class="line" lang="plaintext">into account.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC44" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="45" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="45" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC45" class="line" lang="plaintext">Most time offsets are much smaller than the NTP epoch, so a 32<span class="idiff left right"> </span>bit</span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="45" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC46" class="line" lang="plaintext">representation is used for these. <span class="idiff left right"> Actually, t</span>here were two of these:</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="47" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="45" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC47" class="line" lang="plaintext">s_fp for signed offsets and u_fp for strictly non-negative ones.<span class="idiff left right">  The</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="48" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="45" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC48" class="line" lang="plaintext"><span class="idiff left right">signed version has already been removed in NTPsec.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC45" class="line" lang="plaintext">Most time offsets are much smaller than the NTP epoch, so a 32<span class="idiff left right">-</span>bit</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="49" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="46" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC46" class="line" lang="plaintext">representation is used for these. <span class="idiff left right">T</span>here were two of these:</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="49" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC47" class="line" lang="plaintext">s_fp for signed offsets and u_fp for strictly non-negative ones.</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="49" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext"><span class="idiff left right">NTPsec has already removed the singed version</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="49" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="49" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="50" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="50" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext">The comments in libntp/ntp_calendar.c are pretty illuminating about</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="51" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="51" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC51" class="line" lang="plaintext">calendar representations.  A high-level point they don't make is</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="52" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="52" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC52" class="line" lang="plaintext">that ignoring time cycles in l_fp is <span class="idiff left right">exactly </span>how NTP gets around the</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="53" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext">that ignoring time cycles in l_fp is how NTP gets around the</span>

</pre>

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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext">Y2K38 problem. As long as the average clock skew between machines</span>

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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext">is much less than the length of a calendar cycle (which it generally</span>

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<pre style="margin: 0;"> <span id="LC55" class="line" lang="plaintext">will be, by a factor of at least five million) we can map all incoming</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="62" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="62" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -62,10 +62,10 @@ NTP was written well before the 64-bit word size became common. While</td>

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<pre style="margin: 0;"> <span id="LC62" class="line" lang="plaintext">compilers on 32-bit machines sometimes have had "long long" as an</span>

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<pre style="margin: 0;"> <span id="LC63" class="line" lang="plaintext">integral 64-bit type, this was not guaranteed before C99.</span>

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<pre style="margin: 0;"> <span id="LC64" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC65" class="line" lang="plaintext">Thus <span class="idiff left right">in order </span>to do calendar arithmetic, NTP used to carry a "vint64"</span>

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<pre style="margin: 0;">+<span id="LC65" class="line" lang="plaintext">Thus to do calendar arithmetic, NTP used to carry a "vint64"</span>

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<pre style="margin: 0;"> <span id="LC66" class="line" lang="plaintext">(variant 64-bit int) type that was actually a union with several</span>

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<pre style="margin: 0;">-<span id="LC67" class="line" lang="plaintext">different interpretations<span class="idiff left right">. This has been replaced with a scalar</span></span>

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<pre style="margin: 0;">-<span id="LC68" class="line" lang="plaintext"><span class="idiff left right">time64_t which is used the same way but implemented as a uint64_t</span>.</span>

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<pre style="margin: 0;">+<span id="LC67" class="line" lang="plaintext">different interpretations<span class="idiff left right">; the scalar time64_t which is used the same </span></span>

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<pre style="margin: 0;">+<span id="LC68" class="line" lang="plaintext"><span class="idiff left right">way but implemented as a uint64_t has already replaced this</span>.</span>

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<pre style="margin: 0;"> <span id="LC69" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC70" class="line" lang="plaintext">This still has some utility because NTP still runs on 32-bit machines</span>

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<pre style="margin: 0;"> <span id="LC71" class="line" lang="plaintext">with a 32-bit time_t.</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="80" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="80" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -80,7 +80,7 @@ In a clock sample (a time-sync packet with stratum number 1), the</td>

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<pre style="margin: 0;"> <span id="LC80" class="line" lang="plaintext">refid is interpreted as 4 ASCII characters of clock identification.</span>

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<pre style="margin: 0;"> <span id="LC81" class="line" lang="plaintext">In a time-synchronization packet with stratum 2 or higher the refid</span>

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<pre style="margin: 0;"> <span id="LC82" class="line" lang="plaintext">identifies the originating time server; it may be an IPv4 or a hash of</span>

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<pre style="margin: 0;">-<span id="LC83" class="line" lang="plaintext">an IPv6 address.  (If and when the protocol is <span class="idiff left right">fully </span>redesigned for</span>

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<pre style="margin: 0;">+<span id="LC83" class="line" lang="plaintext">an IPv6 address.  (If and when the protocol is redesigned for</span>

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<pre style="margin: 0;"> <span id="LC84" class="line" lang="plaintext">IPv6 the field length will go to 128 bits and it will become a full</span>

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<pre style="margin: 0;"> <span id="LC85" class="line" lang="plaintext">IPv6 address.)</span>

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<pre style="margin: 0;"> <span id="LC86" class="line" lang="plaintext"></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="96" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="96" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -96,7 +96,7 @@ types ship the refid "GPS". It is possible to fudge this ID to</td>

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<pre style="margin: 0;"> <span id="LC96" class="line" lang="plaintext">something more informative in the ntpd configuration command</span>

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<pre style="margin: 0;"> <span id="LC97" class="line" lang="plaintext">for the driver.</span>

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<pre style="margin: 0;"> <span id="LC98" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC99" class="line" lang="plaintext">The conflation of ID-for-humans with loop-detection cookie is not quite</span>

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<pre style="margin: 0;">+<span id="LC99" class="line" lang="plaintext">The conflation of ID-for-humans with <span class="idiff left right">the </span>loop-detection cookie is not quite</span>

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<pre style="margin: 0;"> <span id="LC100" class="line" lang="plaintext">the design error it looks like, as refclocks aren't implicated in</span>

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<pre style="margin: 0;"> <span id="LC101" class="line" lang="plaintext">loop detection.</span>

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<pre style="margin: 0;"> <span id="LC102" class="line" lang="plaintext"></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="115" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="115" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -115,7 +115,7 @@ the millennium.  The struct timespec is newer and associated with</td>

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<pre style="margin: 0;"> <span id="LC115" class="line" lang="plaintext">ANSI/POSIX standardization.</span>

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<pre style="margin: 0;"> <span id="LC116" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC117" class="line" lang="plaintext">The NTP code was written well before calls like clock_gettime(2) that</span>

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<pre style="margin: 0;">-<span id="LC118" class="line" lang="plaintext">use it were standardized, but as part of <span class="idiff left right">of </span>its general cleanup NTPsec</span>

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<pre style="margin: 0;">+<span id="LC118" class="line" lang="plaintext">use it were standardized, but as part of its general cleanup NTPsec</span>

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<pre style="margin: 0;"> <span id="LC119" class="line" lang="plaintext">has been updated to do all its internal computations at nanosecond</span>

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<pre style="margin: 0;"> <span id="LC120" class="line" lang="plaintext">precision or better.  </span>

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<pre style="margin: 0;"> <span id="LC121" class="line" lang="plaintext"></span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -123,7 +123,7 @@ Thus, when you see a struct timeval in the NTPsec code, it's due to</td>

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<pre style="margin: 0;"> <span id="LC123" class="line" lang="plaintext">a precision limit imposed by an external interface.  One such is in</span>

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<pre style="margin: 0;"> <span id="LC124" class="line" lang="plaintext">the code for using the old BSD adjtime(2) call; another is in getting</span>

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<pre style="margin: 0;"> <span id="LC125" class="line" lang="plaintext">packet timestamps from the IP layer.  Our practice is to convert from</span>

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<pre style="margin: 0;">-<span id="LC126" class="line" lang="plaintext">or to nanosecond precision as close to these callsites as possible;</span>

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<pre style="margin: 0;">+<span id="LC126" class="line" lang="plaintext">or to nanosecond precision as close to these call<span class="idiff left right"> </span>sites as possible;</span>

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<pre style="margin: 0;"> <span id="LC127" class="line" lang="plaintext">this doesn't pull additional accuracy out of thin air, but it does </span>

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<pre style="margin: 0;"> <span id="LC128" class="line" lang="plaintext">avoid loss-of-precision bugs due to mixing these structures.</span>

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<pre style="margin: 0;"> <span id="LC129" class="line" lang="plaintext"></span>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="133" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -133,10 +133,10 @@ In ntpd, there are peer control blocks - one per upstream synchronization</td>

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<pre style="margin: 0;"> <span id="LC133" class="line" lang="plaintext">source - that have an IP address in them.  That's what the main</span>

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<pre style="margin: 0;"> <span id="LC134" class="line" lang="plaintext">control logic works with.</span>

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<pre style="margin: 0;"> <span id="LC135" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC136" class="line" lang="plaintext">The peer buffer holds the last <span class="idiff left right">8</span> samples from the upstream source.</span>

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<pre style="margin: 0;">-<span id="LC137" class="line" lang="plaintext">The normal logic uses the one with the lowest round<span class="idiff left right"> </span>trip time.  That's</span>

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<pre style="margin: 0;">+<span id="LC136" class="line" lang="plaintext">The peer buffer holds the last <span class="idiff left right">eight</span> samples from the upstream source.</span>

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<pre style="margin: 0;">+<span id="LC137" class="line" lang="plaintext">The normal logic uses the one with the lowest round<span class="idiff left right">-</span>trip time.  That's</span>

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<pre style="margin: 0;"> <span id="LC138" class="line" lang="plaintext">a hack to minimize errors from queuing delays out on the big bad</span>

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<pre style="margin: 0;">-<span id="LC139" class="line" lang="plaintext">internet.  Refclock data always has a round trip time of <span class="idiff left right">0</span> and the</span>

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<pre style="margin: 0;">+<span id="LC139" class="line" lang="plaintext">internet.  Refclock data always has a round trip time of <span class="idiff left right">zero,</span> and the</span>

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<pre style="margin: 0;"> <span id="LC140" class="line" lang="plaintext">code that finds the lowest RTT picks the most recent slot when the</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="141" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC141" class="line" lang="plaintext">RTTs are equal.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="142" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC142" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="147" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="147" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -147,7 +147,7 @@ There is no type T_Unsigned.  Range checking may not work right.</td>

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<pre style="margin: 0;"> <span id="LC147" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC148" class="line" lang="plaintext">== ntpd control flow ==</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="149" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC149" class="line" lang="plaintext"></span>

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<td class="diff-line-num old old_line" data-linenumber="150" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="150" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC150" class="line" lang="plaintext">In normal operation, after initialization, ntpd <span class="idiff left right">simply </span>loops forever</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="151" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="150" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC150" class="line" lang="plaintext">In normal operation, after initialization, ntpd loops forever</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="151" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC151" class="line" lang="plaintext">waiting for a UDP packet to arrive on some set of open interfaces, or</span>

</pre>

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<pre style="margin: 0;"> <span id="LC152" class="line" lang="plaintext">a clock sample to arrive from a locally-attached reference clock.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC153" class="line" lang="plaintext">Incoming packets and clock samples are fed to a protocol state</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="157" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="157" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -157,20 +157,20 @@ captured by a function in ntpd/ntpd.c tellingly named 'mainloop()'.</td>

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<pre style="margin: 0;"> <span id="LC157" class="line" lang="plaintext">This main loop is interrupted once per second by a timer tick that</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="158" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC158" class="line" lang="plaintext">sets an alarm flag visible to the mainloop() logic.  When execution</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="159" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="159" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC159" class="line" lang="plaintext">gets back around to where that flag is checked, a timer() function may</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="160" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="160" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC160" class="line" lang="plaintext">fire<span class="idiff left right">.  T</span>his is used to adjust the system clock in time and frequency,</span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="160" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC160" class="line" lang="plaintext">fire<span class="idiff left right">; t</span>his is used to adjust the system clock in time and frequency,</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="161" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="161" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC161" class="line" lang="plaintext">implement the kiss-o'-death function and the association polling</span>

</pre>

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<pre style="margin: 0;"> <span id="LC162" class="line" lang="plaintext">function.</span>

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<pre style="margin: 0;"> <span id="LC163" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC164" class="line" lang="plaintext">There may be one asynchronous thread.  It does DNS lookups of server</span>

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<pre style="margin: 0;">-<span id="LC165" class="line" lang="plaintext">and pool hostnames<span class="idiff left right">.  T</span>his is intended to avoid adding startup delay</span>

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<pre style="margin: 0;">+<span id="LC165" class="line" lang="plaintext">and pool hostnames<span class="idiff left right">; t</span>his is intended to avoid adding startup delay</span>

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<pre style="margin: 0;"> <span id="LC166" class="line" lang="plaintext">and jitter to the time synchronization logic due to address lookups</span>

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<pre style="margin: 0;"> <span id="LC167" class="line" lang="plaintext">of unpredictable length.</span>

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<pre style="margin: 0;"> <span id="LC168" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC169" class="line" lang="plaintext">Input handling used to be a lot more complex.  Due to inability to get</span>

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<pre style="margin: 0;"> <span id="LC170" class="line" lang="plaintext">arrival timestamps from the host's UDP layer, the code used to do</span>

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<pre style="margin: 0;">-<span id="LC171" class="line" lang="plaintext">asynchronous I/O with packet I/O indicated by signal, with packets</span>

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<pre style="margin: 0;">+<span id="LC171" class="line" lang="plaintext">asynchronous I/O with packet I/O indicated by <span class="idiff left right">a </span>signal, with packets</span>

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<pre style="margin: 0;"> <span id="LC172" class="line" lang="plaintext">(and their arrival timestamps) being stashed in a ring of buffers that</span>

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<pre style="margin: 0;">-<span id="LC173" class="line" lang="plaintext">was consumed by the <span class="idiff left right">protocol main</span> loop.  Some of this code hasn't been</span>

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<pre style="margin: 0;">+<span id="LC173" class="line" lang="plaintext">was consumed by the <span class="idiff left right">main protocol</span> loop.  Some of this code hasn't been</span>

</pre>

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<pre style="margin: 0;"> <span id="LC174" class="line" lang="plaintext">cleaned up yet.</span>

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<td class="diff-line-num old_line" data-linenumber="175" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC175" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC176" class="line" lang="plaintext">This looked partly like a performance hack, but if so it was an</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="183" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -183,30 +183,30 @@ dropped.</td>

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<pre style="margin: 0;"> <span id="LC183" class="line" lang="plaintext">get those arrival timestamps from the UDP layer ASAP, rather than</span>

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<pre style="margin: 0;"> <span id="LC184" class="line" lang="plaintext">looking at packet read time in userspace. The cost of the latter,</span>

</pre>

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<pre style="margin: 0;"> <span id="LC185" class="line" lang="plaintext">naive approach is additional jitter dominated by process-scheduling</span>

</pre>

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<pre style="margin: 0;">-<span id="LC186" class="line" lang="plaintext">time<span class="idiff left right">.  T</span>his used to be significant relative to users' accuracy</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="187" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="186" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

186

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC186" class="line" lang="plaintext">time<span class="idiff left right">; t</span>his used to be significant relative to users' accuracy</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="187" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

187

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<td class="diff-line-num new_line" data-linenumber="187" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

187

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC187" class="line" lang="plaintext">expectations for NTP, but scheduler timeslices have since decreased</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="188" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

188

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<td class="diff-line-num new_line" data-linenumber="188" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

188

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC188" class="line" lang="plaintext">by orders of magnitude and squashed the issue. We know this from some</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="189" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

189

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<td class="diff-line-num new_line" data-linenumber="189" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

189

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC189" class="line" lang="plaintext">tests setup having run for six months with packet-timestamp fetching</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="190" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

190

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<td class="diff-line-num new_line old" data-linenumber="190" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC190" class="line" lang="plaintext">accidentally disabled...  But they weren't <span class="idiff left right">horribly </span>busy systems.)</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="191" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="190" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

190

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC190" class="line" lang="plaintext">accidentally disabled...  But they weren't busy systems.)</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="191" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

191

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<td class="diff-line-num new_line" data-linenumber="191" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

191

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC191" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="192" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

192

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<td class="diff-line-num new_line" data-linenumber="192" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

192

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC192" class="line" lang="plaintext">The new organization stops pretending; it simply spins on a select</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="193" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

193

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<td class="diff-line-num new_line" data-linenumber="193" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

193

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC193" class="line" lang="plaintext">across all interfaces.  If inbound traffic is more than the daemon can</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="194" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

194

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<td class="diff-line-num new_line" data-linenumber="194" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

194

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC194" class="line" lang="plaintext">handle, packets will pile up in the UDP layer and be dropped at that</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="195" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

195

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<td class="diff-line-num new_line" data-linenumber="195" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

195

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC195" class="line" lang="plaintext">level. The main difference is that dropped packets are less likely to</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="196" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

196

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<td class="diff-line-num new_line old" data-linenumber="196" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC196" class="line" lang="plaintext">be visible in the statistics the server can gather. (<span class="idiff left right">In order t</span>o show,</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="197" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="196" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

196

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC196" class="line" lang="plaintext">be visible in the statistics the server can gather. (<span class="idiff left right">T</span>o show,</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="197" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

197

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<td class="diff-line-num new_line" data-linenumber="197" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

197

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<pre style="margin: 0;"> <span id="LC197" class="line" lang="plaintext">they'd have to make it out of the system IP layer to userland at a</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="198" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

198

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<td class="diff-line-num new_line" data-linenumber="198" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

198

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC198" class="line" lang="plaintext">higher rate than ntpd can process; this is very unlikely.)</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="199" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

199

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<td class="diff-line-num new_line" data-linenumber="199" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

199

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC199" class="line" lang="plaintext"></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="200" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

200

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<td class="diff-line-num new_line" data-linenumber="200" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

200

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC200" class="line" lang="plaintext">There was internal evidence in the NTP Classic build machinery that</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="201" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

201

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<td class="diff-line-num new_line old" data-linenumber="201" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC201" class="line" lang="plaintext">asynchronous I/O on Unix machines probably hadn't <span class="idiff left right">actually </span>worked for</span>

</pre>

</td>

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<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="202" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="201" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

201

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC201" class="line" lang="plaintext">asynchronous I/O on Unix machines probably hadn't worked for</span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="202" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

202

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<td class="diff-line-num new_line" data-linenumber="202" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

202

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC202" class="line" lang="plaintext">quite a while before NTPsec removed it.</span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="203" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

203

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<td class="diff-line-num new_line" data-linenumber="203" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

203

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC203" class="line" lang="plaintext"></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="204" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC204" class="line" lang="plaintext">== System call interface and the PLL ==</span>

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<pre style="margin: 0;"> <span id="LC205" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC206" class="line" lang="plaintext">All of ntpd<span class="idiff left right">'</span>s clock management is done through four system calls:</span>

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<pre style="margin: 0;">+<span id="LC206" class="line" lang="plaintext">All of ntpds clock management is done through four system calls:</span>

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<pre style="margin: 0;"> <span id="LC207" class="line" lang="plaintext">clock_gettime(2), clock_settime(2), and either ntp_adjtime(2) or (in</span>

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<pre style="margin: 0;"> <span id="LC208" class="line" lang="plaintext">exceptional cases) the older BSD adjtime(2) call.  For ntp_adjtime(),</span>

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<pre style="margin: 0;">-<span id="LC209" class="line" lang="plaintext">ntpd <span class="idiff left right">actually </span>uses a thin wrapper that hides the difference between</span>

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<pre style="margin: 0;">+<span id="LC209" class="line" lang="plaintext">ntpd uses a thin wrapper that hides the difference between</span>

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<pre style="margin: 0;"> <span id="LC210" class="line" lang="plaintext">systems with nanosecond-precision and those with only microsecond</span>

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<pre style="margin: 0;"> <span id="LC211" class="line" lang="plaintext">precision; internally, ntpd does all its calculations with nanosecond</span>

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<pre style="margin: 0;"> <span id="LC212" class="line" lang="plaintext">precision.</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="269" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -269,21 +269,21 @@ ntp_adjtime(2). ntp_adjtime(2)/adjtimex(2) uses a kernel interface to</td>

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<pre style="margin: 0;"> <span id="LC269" class="line" lang="plaintext">do its work, using a control technique called a PLL/FLL (phase-locked</span>

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<pre style="margin: 0;"> <span id="LC270" class="line" lang="plaintext">loop/frequency-locked loop) to do it.</span>

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<pre style="margin: 0;"> <span id="LC271" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC272" class="line" lang="plaintext">The older BSD adjtime(2) can be used for slewing as well<span class="idiff left right">,</span> but doesn't</span>

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<pre style="margin: 0;">-<span id="LC273" class="line" lang="plaintext">assume a kernel-level PLL is available.  It is used <span class="idiff left right">only </span>when</span>

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<pre style="margin: 0;">+<span id="LC272" class="line" lang="plaintext">The older BSD adjtime(2) can be used for slewing as well but doesn't</span>

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<pre style="margin: 0;">+<span id="LC273" class="line" lang="plaintext">assume a kernel-level PLL is available.  It is used when</span>

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<pre style="margin: 0;"> <span id="LC274" class="line" lang="plaintext">ntp_adjtime() calls generate a SIGSYS because the system call has not</span>

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<pre style="margin: 0;">-<span id="LC275" class="line" lang="plaintext">been implemented.  Without the PLL calls, convergence to good time is</span>

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<pre style="margin: 0;">-<span id="LC276" class="line" lang="plaintext">observably a lot slower and tracking will accordingly be less</span>

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<pre style="margin: 0;">+<span id="LC275" class="line" lang="plaintext">been implemented.  Without the PLL calls, convergence to <span class="idiff left right">a </span>good time is</span>

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<pre style="margin: 0;">+<span id="LC276" class="line" lang="plaintext">observably a lot slower<span class="idiff left right">,</span> and tracking will accordingly be less</span>

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<pre style="margin: 0;"> <span id="LC277" class="line" lang="plaintext">reliable; support for systems that lack them (notably OpenBSD and</span>

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<pre style="margin: 0;">-<span id="LC278" class="line" lang="plaintext">older Mac OS X versions) has been dropped fom NTPsec.</span>

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<pre style="margin: 0;">+<span id="LC278" class="line" lang="plaintext">older Mac OS X versions) has been dropped f<span class="idiff left right">r</span>om NTPsec.</span>

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<pre style="margin: 0;"> <span id="LC279" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC280" class="line" lang="plaintext">Deep-in-the weeds details about the kernel PLL from Hal Murray follow.</span>

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<pre style="margin: 0;">-<span id="LC281" class="line" lang="plaintext">If you can follow these<span class="idiff left right"> you may be qualified to maintain this code..</span>.</span>

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<pre style="margin: 0;">+<span id="LC281" class="line" lang="plaintext">If you can follow these<span class="idiff left right">, you may be qualified to maintain this code</span>.</span>

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<pre style="margin: 0;"> <span id="LC282" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC283" class="line" lang="plaintext">Deep inside the kernel, there is code that updates the time by reading the</span>

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<pre style="margin: 0;"> <span id="LC284" class="line" lang="plaintext">cycle counter, subtracting off the previous cycle count and multiplying by</span>

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<pre style="margin: 0;"> <span id="LC285" class="line" lang="plaintext">the time/cycle.  The actual implementation is complicated mostly to maintain</span>

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<pre style="margin: 0;">-<span id="LC286" class="line" lang="plaintext">accuracy.  You need ballpark of 9 digits of accuracy on the time/cycle and</span>

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<pre style="margin: 0;">+<span id="LC286" class="line" lang="plaintext">accuracy.  You need ballpark of 9 digits of accuracy on the time/cycle<span class="idiff left right">,</span> and</span>

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<pre style="margin: 0;"> <span id="LC287" class="line" lang="plaintext">that has to get carried through the calculations.</span>

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<pre style="margin: 0;"> <span id="LC288" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC289" class="line" lang="plaintext">On PCs, Linux measures the time/cycle at boot time by comparing with another</span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -301,13 +301,13 @@ You can grep for "MHz" to find these.</td>

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<pre style="margin: 0;"> <span id="LC301" class="line" lang="plaintext">the clock fuzzing to smear the EMI over a broader band to comply with</span>

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<pre style="margin: 0;"> <span id="LC302" class="line" lang="plaintext">FCC rules.  It rounds down to make sure the CPU isn't overclocked.)</span>

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<pre style="margin: 0;"> <span id="LC303" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC304" class="line" lang="plaintext">There is an API call to adjust the time/cycle.  That adjustment is ntpd<span class="idiff left right">'</span>s</span>

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<pre style="margin: 0;">+<span id="LC304" class="line" lang="plaintext">There is an API call to adjust the time/cycle.  That adjustment is ntpds</span>

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<pre style="margin: 0;"> <span id="LC305" class="line" lang="plaintext">drift.  That covers manufacturing errors and temperature changes and such.</span>

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<pre style="margin: 0;"> <span id="LC306" class="line" lang="plaintext">The manufacturing error part is typically under 50 PPM.  I have a few systems</span>

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<pre style="margin: 0;"> <span id="LC307" class="line" lang="plaintext">off by over 100.  The temperature part varies by ballpark of 1 PPM / C.</span>

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<pre style="margin: 0;"> <span id="LC308" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC309" class="line" lang="plaintext">There is another error source which is errors in the calibration code and<span class="idiff left right">/or</span></span>

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<pre style="margin: 0;">-<span id="LC310" class="line" lang="plaintext">time<span class="idiff left right"> </span>keeping code.  If your timekeeping code rounds down occasionally, you</span>

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<pre style="margin: 0;">+<span id="LC309" class="line" lang="plaintext">There is another error source which is errors in the calibration code and</span>

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<pre style="margin: 0;">+<span id="LC310" class="line" lang="plaintext">timekeeping code.  If your timekeeping code rounds down occasionally, you</span>

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<pre style="margin: 0;"> <span id="LC311" class="line" lang="plaintext">can correct for that by tweaking the time/cycle.</span>

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<pre style="margin: 0;"> <span id="LC312" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC313" class="line" lang="plaintext">There is another API that says "slew the clock by X seconds".  That is</span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -320,7 +320,7 @@ implemented in user code with reduced accuracy.</td>

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<pre style="margin: 0;"> <span id="LC320" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC321" class="line" lang="plaintext">There is a PLL kernel option to track a PPS.  It's not compiled into most</span>

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<pre style="margin: 0;"> <span id="LC322" class="line" lang="plaintext">Linux kernels.  (It doesn't work with tickless.)  There is an API to turn it</span>

</pre>

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<pre style="margin: 0;">-<span id="LC323" class="line" lang="plaintext">on.  Then ntpd <span class="idiff left right">basically </span>sits off to the side and watches.</span>

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<pre style="margin: 0;">+<span id="LC323" class="line" lang="plaintext">on.  Then ntpd sits off to the side and watches.</span>

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<pre style="margin: 0;"> <span id="LC324" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC325" class="line" lang="plaintext">RFC 1589 covers the above timekeeping and slewing and kernel PLL.</span>

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<pre style="margin: 0;"> <span id="LC326" class="line" lang="plaintext"></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="335" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="335" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -335,10 +335,10 @@ that the clock is actually a peer."  The code mostly hides the</td>

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<pre style="margin: 0;"> <span id="LC335" class="line" lang="plaintext">difference between clock samples and sync updates from peers.</span>

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<pre style="margin: 0;"> <span id="LC336" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC337" class="line" lang="plaintext">Internally, each refclock has a FIFO holding the last ~64 samples.  For</span>

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<pre style="margin: 0;">-<span id="LC338" class="line" lang="plaintext">things like NMEA, each time the driver gets a valid sample it adds it to the</span>

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<pre style="margin: 0;">+<span id="LC338" class="line" lang="plaintext">things like NMEA, each time the driver<span class="idiff left right">,</span> gets a valid sample it adds it to the</span>

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<pre style="margin: 0;"> <span id="LC339" class="line" lang="plaintext">FIFO.  For the Atom/PPS driver there is a hook that gets called/polled each</span>

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<pre style="margin: 0;"> <span id="LC340" class="line" lang="plaintext">second.  If it finds good data, it adds a sample to the FIFO.  The FIFO is</span>

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<pre style="margin: 0;">-<span id="LC341" class="line" lang="plaintext">a<span class="idiff left right">ctually a</span> ring buffer.  On overflow, old samples are dropped.</span>

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<pre style="margin: 0;">+<span id="LC341" class="line" lang="plaintext">a ring buffer.  On overflow, old samples are dropped.</span>

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<pre style="margin: 0;"> <span id="LC342" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC343" class="line" lang="plaintext">At the polling interval, the driver is "polled".  (Note the possible</span>

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<pre style="margin: 0;"> <span id="LC344" class="line" lang="plaintext">confusion on "poll".)  That is parallel with sending a packet to the</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="352" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="352" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -352,7 +352,7 @@ injects that into the peer buffer for the refclock.</td>

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<pre style="margin: 0;"> <span id="LC352" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC353" class="line" lang="plaintext">== Asynchronous DNS lookup ==</span>

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<pre style="margin: 0;"> <span id="LC354" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC355" class="line" lang="plaintext">The DNS code runs in a separate thread <span class="idiff left right">in order </span>to avoid stalling</span>

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<pre style="margin: 0;">+<span id="LC355" class="line" lang="plaintext">The DNS code runs in a separate thread to avoid stalling</span>

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<pre style="margin: 0;"> <span id="LC356" class="line" lang="plaintext">the main loop while it waits for a DNS lookup to return. And DNS</span>

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<pre style="margin: 0;"> <span id="LC357" class="line" lang="plaintext">lookups can take a *long* time.  Hal Murray notes that</span>

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<pre style="margin: 0;"> <span id="LC358" class="line" lang="plaintext">he thinks he's seen 40 seconds on a failing case.</span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -365,7 +365,7 @@ need - notably an input-buffer pool.  (It also had an obscure bug.)</td>

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<pre style="margin: 0;"> <span id="LC365" class="line" lang="plaintext">The DNS lookups during initialization - of hostnames specified on the</span>

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<pre style="margin: 0;"> <span id="LC366" class="line" lang="plaintext">command line or server lines in ntp.conf - could be done synchronously.</span>

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<pre style="margin: 0;"> <span id="LC367" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC368" class="line" lang="plaintext">But that would delay startup and there are two cases we know of where</span>

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<pre style="margin: 0;">+<span id="LC368" class="line" lang="plaintext">But that would delay startup<span class="idiff left right">,</span> and there are two cases we know of where</span>

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<pre style="margin: 0;"> <span id="LC369" class="line" lang="plaintext">ntpd has to do a DNS lookup during normal operation.</span>

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<pre style="margin: 0;"> <span id="LC370" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC371" class="line" lang="plaintext">One is the try again when DNS for the normal server case doesn't work during</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="386" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="386" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -386,23 +386,23 @@ rather than only replacing dead servers.</td>

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<pre style="margin: 0;"> <span id="LC386" class="line" lang="plaintext">== The build recipe ==</span>

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<pre style="margin: 0;"> <span id="LC387" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC388" class="line" lang="plaintext">The build recipe is, essentially, a big Python program using a set of</span>

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<pre style="margin: 0;">-<span id="LC389" class="line" lang="plaintext">specialized procedures caled 'waf'.  To learn about waf itself see</span>

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<pre style="margin: 0;">+<span id="LC389" class="line" lang="plaintext">specialized procedures cal<span class="idiff left right">l</span>ed 'waf'.  To learn about waf itself see</span>

</pre>

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<pre style="margin: 0;"> <span id="LC390" class="line" lang="plaintext">the https://waf.io/book/[Waf Book]; this section is about the</span>

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<pre style="margin: 0;"> <span id="LC391" class="line" lang="plaintext">organization and particular quirks of NTPsec's build.</span>

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<pre style="margin: 0;"> <span id="LC392" class="line" lang="plaintext"></span>

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<td class="diff-line-num old_line" data-linenumber="393" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

393

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<td class="diff-line-num new_line" data-linenumber="393" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

393

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC393" class="line" lang="plaintext">If you are used to autoconf, you will find the waf recipe</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="394" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

394

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<td class="diff-line-num new_line" data-linenumber="394" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

394

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC394" class="line" lang="plaintext">odd at first.  We replaced autoconf because with waf the</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="395" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

395

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<td class="diff-line-num new_line old" data-linenumber="395" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC395" class="line" lang="plaintext">build recipe is <span class="idiff left right">literally </span>orders of magnitude less complex,</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="396" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="395" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

395

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC395" class="line" lang="plaintext">build recipe is orders of magnitude less complex,</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="396" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

396

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<td class="diff-line-num new_line" data-linenumber="396" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

396

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC396" class="line" lang="plaintext">faster, and more maintainable.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="397" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

397

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<td class="diff-line-num new_line" data-linenumber="397" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

397

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC397" class="line" lang="plaintext"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="398" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

398

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<td class="diff-line-num new_line old" data-linenumber="398" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC398" class="line" lang="plaintext">The top<span class="idiff left right"> </span>level wscript calls wscript files in various subdirectories</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="399" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="398" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

398

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC398" class="line" lang="plaintext">The top<span class="idiff left right">-</span>level wscript calls wscript files in various subdirectories</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="399" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

399

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<td class="diff-line-num new_line" data-linenumber="399" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

399

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC399" class="line" lang="plaintext">using the ctx.recurse() function. These subfiles are all relatively</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="400" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

400

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<td class="diff-line-num new_line" data-linenumber="400" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

400

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC400" class="line" lang="plaintext">simple, consisting mainly of calls to the waf function ctx().  Each</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="401" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

401

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<td class="diff-line-num new_line" data-linenumber="401" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

401

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC401" class="line" lang="plaintext">such call declares a build target to be composed (often using the</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="402" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

402

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<td class="diff-line-num new_line" data-linenumber="402" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

402

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC402" class="line" lang="plaintext">compiler) from various prerequisites.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="403" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

403

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<td class="diff-line-num new_line" data-linenumber="403" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

403

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC403" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="404" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

404

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<td class="diff-line-num new_line" data-linenumber="404" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

404

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC404" class="line" lang="plaintext">The top-level wscript does not itself declare a lot of targets (the</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="405" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

405

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<td class="diff-line-num new_line old" data-linenumber="405" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC405" class="line" lang="plaintext">exceptions are a handful of installable shellscripts and man pages).</span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="406" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="405" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

405

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC405" class="line" lang="plaintext">exceptions are a handful of installable shell<span class="idiff left right"> </span>scripts and man pages).</span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="406" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

406

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<td class="diff-line-num new_line" data-linenumber="406" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

406

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC406" class="line" lang="plaintext">It is mainly concerned with setting up various assumptions for the</span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="407" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

407

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<td class="diff-line-num new_line" data-linenumber="407" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

407

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC407" class="line" lang="plaintext">configure and build phases.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="408" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

408

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<td class="diff-line-num new_line" data-linenumber="408" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

408

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC408" class="line" lang="plaintext"></span>

</pre>

</td>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="410" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="410" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -410,7 +410,7 @@ If you are used to working with Makefiles, you may find the absence</td>

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<td class="diff-line-num old_line" data-linenumber="410" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

410

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<td class="diff-line-num new_line" data-linenumber="410" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

410

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC410" class="line" lang="plaintext">of object files and binaries from the source directory after a build</span>

</pre>

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<pre style="margin: 0;"> <span id="LC411" class="line" lang="plaintext">surprising.  Look under the build/ directory.</span>

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<pre style="margin: 0;"> <span id="LC412" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC413" class="line" lang="plaintext">Most of the complexity in this build is in the configure phase<span class="idiff left right">,</span> when</span>

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<td class="diff-line-num new new_line" data-linenumber="413" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC413" class="line" lang="plaintext">Most of the complexity in this build is in the configure phase when</span>

</pre>

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<pre style="margin: 0;"> <span id="LC414" class="line" lang="plaintext">the build engine is probing the environment.  The product of this</span>

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<pre style="margin: 0;"> <span id="LC415" class="line" lang="plaintext">phase is the file build/config.h, which the C programs include to</span>

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<pre style="margin: 0;"> <span id="LC416" class="line" lang="plaintext">get symbols that describe the environment's capabilities and</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="421" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="421" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -421,7 +421,7 @@ in the wafhelpers/ directory. The entire collection is structured as</td>

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<pre style="margin: 0;"> <span id="LC421" class="line" lang="plaintext">a loadable Python module.  Here are a few useful generalizations:</span>

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<pre style="margin: 0;"> <span id="LC422" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC423" class="line" lang="plaintext">* The main sequence of the configuration logic, and most of the simpler</span>

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<pre style="margin: 0;">-<span id="LC424" class="line" lang="plaintext">  checks<span class="idiff left right">, lives</span> in configure.py.</span>

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<pre style="margin: 0;">+<span id="LC424" class="line" lang="plaintext">  checks<span class="idiff left right"> live</span> in configure.py.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC425" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC426" class="line" lang="plaintext">* Some generic but bulky helper functions live in probes.py.</span>

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<pre style="margin: 0;"> <span id="LC427" class="line" lang="plaintext"></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="476" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="476" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -476,7 +476,7 @@ re-used.</td>

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<pre style="margin: 0;"> <span id="LC476" class="line" lang="plaintext"></span>

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<td class="diff-line-num old_line" data-linenumber="477" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC477" class="line" lang="plaintext">=== ntpdig ===</span>

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<td class="diff-line-num old_line" data-linenumber="478" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC478" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="479" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="479" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC479" class="line" lang="plaintext">ntpdig also uses the pylib library<span class="idiff left right">,</span> but doesn't speak Mode 6.</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="480" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="479" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC479" class="line" lang="plaintext">ntpdig also uses the pylib library but doesn't speak Mode 6.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC480" class="line" lang="plaintext">Instead, it builds and interprets time-synchronization packets </span>

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<pre style="margin: 0;"> <span id="LC481" class="line" lang="plaintext">using some of the same machinery.</span>

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<pre style="margin: 0;"> <span id="LC482" class="line" lang="plaintext"></span>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="492" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -492,7 +492,7 @@ layers of segment reassembly.  The lower layer is the vanilla UDP</td>

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<pre style="margin: 0;"> <span id="LC492" class="line" lang="plaintext">fragment reassembly encapsulated in do_query() and shared with the</span>

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<pre style="margin: 0;"> <span id="LC493" class="line" lang="plaintext">other request types.</span>

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<pre style="margin: 0;"> <span id="LC494" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC495" class="line" lang="plaintext"><span class="idiff left right">In order to avoid blocking for long periods of time, and in order</span> to</span>

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<pre style="margin: 0;">+<span id="LC495" class="line" lang="plaintext"><span class="idiff left right">To avoid blocking for long periods of time, and</span> to</span>

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<pre style="margin: 0;"> <span id="LC496" class="line" lang="plaintext">be cleanly interruptible by control-C, the upper layer does a sequence</span>

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<pre style="margin: 0;"> <span id="LC497" class="line" lang="plaintext">of requests for MRU spans, which are multi-frag sequences of</span>

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<pre style="margin: 0;"> <span id="LC498" class="line" lang="plaintext">ASCIIizations of MRU records, oldest to newest.  The spans include</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="506" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -506,12 +506,12 @@ has finished.</td>

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<pre style="margin: 0;"> <span id="LC506" class="line" lang="plaintext">The code collects all the data, maybe sorts it, then prints it out.</span>

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<pre style="margin: 0;"> <span id="LC507" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC508" class="line" lang="plaintext">There is also a direct mode that prints the individual slots</span>

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<pre style="margin: 0;">-<span id="LC509" class="line" lang="plaintext">as they come in<span class="idiff left right">.  T</span>his avoids needing lots of memory if you want</span>

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<pre style="margin: 0;">+<span id="LC509" class="line" lang="plaintext">as they come in<span class="idiff left right">; t</span>his avoids needing lots of memory if you want</span>

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510

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<pre style="margin: 0;"> <span id="LC510" class="line" lang="plaintext">to get the MRU data from a system that keeps lots of history.</span>

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<pre style="margin: 0;"> <span id="LC511" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC512" class="line" lang="plaintext">A further interesting complication is use of a nonce to foil DDoSes by</span>

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<pre style="margin: 0;">+<span id="LC512" class="line" lang="plaintext">A further interesting complication is <span class="idiff left right">the </span>use of a nonce to foil DDoSes by</span>

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<pre style="margin: 0;"> <span id="LC513" class="line" lang="plaintext">source-address spoofing.  The mrulist() code begins by requesting a</span>

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<pre style="margin: 0;">-<span id="LC514" class="line" lang="plaintext">nonce from ntpd, which it then replays between span requets to</span>

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<pre style="margin: 0;">+<span id="LC514" class="line" lang="plaintext">nonce from ntpd, which it then replays between span reque<span class="idiff left right">s</span>ts to</span>

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<pre style="margin: 0;"> <span id="LC515" class="line" lang="plaintext">convince ntpd that the address it's firehosing all that MRU data at is</span>

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<pre style="margin: 0;"> <span id="LC516" class="line" lang="plaintext">the same one that asked for the nonce. To foil replay attacks, the</span>

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<pre style="margin: 0;"> <span id="LC517" class="line" lang="plaintext">nonce is timed out; you have to re-request another every 16 seconds</span>

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