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<h3>
Eric S. Raymond 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/d9024785b6c5a8b648b4f6a6982b6de1d2afa286">d9024785</a></strong>
<div>
<span>by Eric S. Raymond</span>
<i>at 2016-09-28T05:54:21-04:00</i>
</div>
<pre class="commit-message" style="margin: 0; white-space: pre-wrap">Adopt util/hist.c to use clock_gettime(2).
As a bonus, use the monotonic timer so the results are not affected
by any NTP slewing during the measurement.
</pre>
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<h4>2 changed files:</h4>
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util/README
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util/hist.c
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<h4>Changes:</h4>
<li id="diff-0">
<a href="https://gitlab.com/NTPsec/ntpsec/commit/d9024785b6c5a8b648b4f6a6982b6de1d2afa286#diff-0"><strong>util/README</strong></a>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -11,7 +11,7 @@ hist.c:: This program can be used to calibrate the clock reading</td>
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<pre style="margin: 0"> <span id="LC11" class="line"> jitter of a particular CPU and operating system. It</span>
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<pre style="margin: 0"> <span id="LC12" class="line"> first tickles every element of an array, in order to</span>
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<pre style="margin: 0"> <span id="LC13" class="line"> force pages into memory, then repeatedly calls</span>
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<pre style="margin: 0"> <span id="LC14" class="line"> <span class="idiff left right">gettimeofday</span>() and, finally, writes out the time</span>
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<pre style="margin: 0"> <span id="LC14" class="line"> <span class="idiff left right">clock_gettime</span>() and, finally, writes out the time</span>
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<pre style="margin: 0"> <span id="LC15" class="line"> values for later analysis. From this you can determine</span>
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<pre style="margin: 0"> <span id="LC16" class="line"> the jitter and if the clock ever runs backwards.</span>
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<pre style="margin: 0"> <span id="LC17" class="line"> To compile in the util directory, run waf configure and:</span>
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<a href="https://gitlab.com/NTPsec/ntpsec/commit/d9024785b6c5a8b648b4f6a6982b6de1d2afa286#diff-1"><strong>util/hist.c</strong></a>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -2,7 +2,7 @@</td>
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<pre style="margin: 0"> <span id="LC2" class="line"><span class="cm" style="color: #998; font-style: italic"> * This program can be used to calibrate the clock reading jitter of a</span></span>
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<pre style="margin: 0"> <span id="LC3" class="line"><span class="cm" style="color: #998; font-style: italic"> * particular CPU and operating system. It first tickles every element</span></span>
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<pre style="margin: 0"> <span id="LC4" class="line"><span class="cm" style="color: #998; font-style: italic"> * of an array, in order to force pages into memory, then repeatedly calls</span></span>
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<pre style="margin: 0"> <span id="LC5" class="line"><span class="cm" style="color: #998; font-style: italic"> * <span class="idiff left right">gettimeofday</span>() and, finally, writes out the time values for later</span></span>
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<pre style="margin: 0"> <span id="LC5" class="line"><span class="cm" style="color: #998; font-style: italic"> * <span class="idiff left right">clock_gettime</span>() and, finally, writes out the time values for later</span></span>
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<pre style="margin: 0"> <span id="LC6" class="line"><span class="cm" style="color: #998; font-style: italic"> * analysis. From this you can determine the jitter and if the clock ever</span></span>
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<pre style="margin: 0"> <span id="LC7" class="line"><span class="cm" style="color: #998; font-style: italic"> * runs backwards.</span></span>
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<pre style="margin: 0"> <span id="LC8" class="line"><span class="cm" style="color: #998; font-style: italic"> */</span></span>
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<pre style="margin: 0"> <span id="LC13" class="line"></span>
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<pre style="margin: 0"> <span id="LC14" class="line"><span class="cp" style="color: #999; font-weight: bold">#include <stdio.h></span></span>
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<pre style="margin: 0"> <span id="LC15" class="line"><span class="cp" style="color: #999; font-weight: bold">#include <stdlib.h></span></span>
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<pre style="margin: 0"> <span id="LC16" class="line"><span class="cp" style="color: #999; font-weight: bold">#include <time.h></span></span>
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<pre style="margin: 0"> <span id="LC17" class="line"></span>
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<pre style="margin: 0"> <span id="LC17" class="line"><span class="cp" style="color: #999; font-weight: bold">#define NBUF 100001 </span><span class="cm" style="color: #998; font-style: italic">/* size of basic histogram */</span></span>
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<pre style="margin: 0"> <span id="LC18" class="line"><span class="cp" style="color: #999; font-weight: bold">#define NSRT 20000 </span><span class="cm" style="color: #998; font-style: italic">/* size of overflow histogram */</span></span>
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<pre style="margin: 0"> <span id="LC19" class="line"><span class="cp" style="color: #999; font-weight: bold">#define NCNT (600 * 1000000) </span><span class="cm" style="color: #998; font-style: italic">/* sample interval (us) */</span></span>
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<pre style="margin: 0"> <span id="LC18" class="line"><span class="cp" style="color: #999; font-weight: bold">#define NANOSECONDS 1000000000L</span></span>
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<pre style="margin: 0"> <span id="LC20" class="line"><span class="cp" style="color: #999; font-weight: bold">#define NBUF 100001 </span><span class="cm" style="color: #998; font-style: italic">/* size of basic histogram */</span></span>
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<pre style="margin: 0"> <span id="LC21" class="line"><span class="cp" style="color: #999; font-weight: bold">#define NSRT 20000 </span><span class="cm" style="color: #998; font-style: italic">/* size of overflow histogram */</span></span>
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<pre style="margin: 0"> <span id="LC22" class="line"><span class="cp" style="color: #999; font-weight: bold">#define NCNT (600L * NANOSECONDS) </span><span class="cm" style="color: #998; font-style: italic">/* sample interval (ns) */</span></span>
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<pre style="margin: 0"> <span id="LC24" class="line"><span class="kt" style="color: #458; font-weight: bold">int</span> <span class="n" style="color: #333">col</span> <span class="p">(</span><span class="k" style="font-weight: bold">const</span> <span class="kt" style="color: #458; font-weight: bold">void</span> <span class="o" style="font-weight: bold">*</span><span class="p">,</span> <span class="k" style="font-weight: bold">const</span> <span class="kt" style="color: #458; font-weight: bold">void</span> <span class="o" style="font-weight: bold">*</span><span class="p">);</span></span>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -26,8 +29,7 @@ main(</td>
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<pre style="margin: 0"> <span id="LC29" class="line"> <span class="kt" style="color: #458; font-weight: bold">char</span> <span class="o" style="font-weight: bold">*</span><span class="n" style="color: #333">argv</span><span class="p">[]</span></span>
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<pre style="margin: 0"> <span id="LC30" class="line"> <span class="p">)</span></span>
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<pre style="margin: 0"> <span id="LC31" class="line"><span class="p">{</span></span>
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<pre style="margin: 0"> <span id="LC29" class="line"> <span class="k" style="font-weight: bold">struct</span> <span class="n" style="color: #333">timeval</span> <span class="n" style="color: #333">ts</span><span class="p">,</span> <span class="n" style="color: #333">tr</span><span class="p">;</span></span>
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<pre style="margin: 0"> <span id="LC30" class="line"> <span class="k" style="font-weight: bold">struct</span> <span class="n" style="color: #333">timezone</span> <span class="n" style="color: #333">tzp</span><span class="p">;</span></span>
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<pre style="margin: 0"> <span id="LC32" class="line"> <span class="k" style="font-weight: bold">struct</span> <span class="n" style="color: #333">timespec</span> <span class="n" style="color: #333">ts</span><span class="p">,</span> <span class="n" style="color: #333">tr</span><span class="p">;</span></span>
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<pre style="margin: 0"> <span id="LC33" class="line"> <span class="kt" style="color: #458; font-weight: bold">int</span> <span class="n" style="color: #333">i</span><span class="p">,</span> <span class="n" style="color: #333">j</span><span class="p">,</span> <span class="n" style="color: #333">n</span><span class="p">;</span></span>
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<pre style="margin: 0"> <span id="LC34" class="line"> <span class="kt" style="color: #458; font-weight: bold">long</span> <span class="n" style="color: #333">t</span><span class="p">,</span> <span class="n" style="color: #333">u</span><span class="p">,</span> <span class="n" style="color: #333">v</span><span class="p">,</span> <span class="n" style="color: #333">w</span><span class="p">,</span> <span class="n" style="color: #333">gtod</span><span class="p">[</span><span class="n" style="color: #333">NBUF</span><span class="p">],</span> <span class="n" style="color: #333">ovfl</span><span class="p">[</span><span class="n" style="color: #333">NSRT</span><span class="p">];</span></span>
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<pre style="margin: 0"> <span id="LC35" class="line"></span>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -46,20 +48,20 @@ main(</td>
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<pre style="margin: 0"> <span id="LC48" class="line"><span class="cm" style="color: #998; font-style: italic"> * Construct histogram</span></span>
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<pre style="margin: 0"> <span id="LC49" class="line"><span class="cm" style="color: #998; font-style: italic"> */</span></span>
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<pre style="margin: 0"> <span id="LC50" class="line"> <span class="n" style="color: #333">n</span> <span class="o" style="font-weight: bold">=</span> <span class="mi" style="color: #099">0</span><span class="p">;</span></span>
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<pre style="margin: 0"> <span id="LC49" class="line"> <span class="n" style="color: #333"><span class="idiff left">gettimeofday</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: bold"><span class="idiff">&</span></span><span class="n" style="color: #333"><span class="idiff">ts</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="o" style="font-weight: bold"><span class="idiff">&</span></span><span class="n" style="color: #333"><span class="idiff right">tzp</span></span><span class="p">);</span></span>
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50
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<pre style="margin: 0"> <span id="LC50" class="line"> <span class="n" style="color: #333">t</span> <span class="o" style="font-weight: bold">=</span> <span class="n" style="color: #333">ts</span><span class="p">.</span><span class="n" style="color: #333">tv_sec</span> <span class="o" style="font-weight: bold">*</span> <span class="mi" style="color: #099"><span class="idiff left">1000000</span></span><span class="idiff"> </span><span class="o" style="font-weight: bold"><span class="idiff">+</span></span><span class="idiff"> </span><span class="n" style="color: #333"><span class="idiff">ts</span></span><span class="p"><span class="idiff">.</span></span><span class="n" style="color: #333"><span class="idiff right">tv_u</span>sec</span><span class="p">;</span></span>
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<td class="diff-line-num new new_line" data-linenumber="51" style="background: #ddfbe6; border-right-color: #c7f0d2; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0"> <span id="LC51" class="line"> <span class="n" style="color: #333"><span class="idiff left">clock_gettime</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333"><span class="idiff">CLOCK_MONOTONIC</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="o" style="font-weight: bold"><span class="idiff">&</span></span><span class="n" style="color: #333"><span class="idiff right">ts</span></span><span class="p">);</span></span>
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<td class="diff-line-num new new_line" data-linenumber="52" style="background: #ddfbe6; border-right-color: #c7f0d2; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0"> <span id="LC52" class="line"> <span class="n" style="color: #333">t</span> <span class="o" style="font-weight: bold">=</span> <span class="n" style="color: #333">ts</span><span class="p">.</span><span class="n" style="color: #333">tv_sec</span> <span class="o" style="font-weight: bold">*</span> <span class="n" style="color: #333"><span class="idiff left">NANOSECONDS</span></span><span class="idiff"> </span><span class="o" style="font-weight: bold"><span class="idiff">+</span></span><span class="idiff"> </span><span class="n" style="color: #333"><span class="idiff">ts</span></span><span class="p"><span class="idiff">.</span></span><span class="n" style="color: #333"><span class="idiff right">tv_n</span>sec</span><span class="p">;</span></span>
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<pre style="margin: 0"> <span id="LC53" class="line"> <span class="n" style="color: #333">v</span> <span class="o" style="font-weight: bold">=</span> <span class="n" style="color: #333">t</span><span class="p">;</span></span>
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<td class="diff-line-num new_line" data-linenumber="54" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
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<pre style="margin: 0"> <span id="LC54" class="line"> <span class="k" style="font-weight: bold">while</span> <span class="p">(</span><span class="mi" style="color: #099">1</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="diff-line-num new_line old" data-linenumber="55" style="background: #f9d7dc; border-right-color: #fac5cd; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0"> <span id="LC53" class="line"> <span class="n" style="color: #333"><span class="idiff left">gettimeofday</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: bold"><span class="idiff">&</span></span><span class="n" style="color: #333"><span class="idiff">tr</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="o" style="font-weight: bold"><span class="idiff">&</span></span><span class="n" style="color: #333"><span class="idiff right">tzp</span></span><span class="p">);</span></span>
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<td class="diff-line-num new_line old" data-linenumber="55" style="background: #f9d7dc; border-right-color: #fac5cd; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0"> <span id="LC54" class="line"> <span class="n" style="color: #333">u</span> <span class="o" style="font-weight: bold">=</span> <span class="n" style="color: #333">tr</span><span class="p">.</span><span class="n" style="color: #333">tv_sec</span> <span class="o" style="font-weight: bold">*</span> <span class="mi" style="color: #099"><span class="idiff left">1000000</span></span><span class="idiff"> </span><span class="o" style="font-weight: bold"><span class="idiff">+</span></span><span class="idiff"> </span><span class="n" style="color: #333"><span class="idiff">tr</span></span><span class="p"><span class="idiff">.</span></span><span class="n" style="color: #333"><span class="idiff right">tv_u</span>sec</span><span class="p">;</span> </span>
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<pre style="margin: 0"> <span id="LC55" class="line"> <span class="n" style="color: #333"><span class="idiff left">clock_gettime</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333"><span class="idiff">CLOCK_MONOTONIC</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="o" style="font-weight: bold"><span class="idiff">&</span></span><span class="n" style="color: #333"><span class="idiff right">tr</span></span><span class="p">);</span></span>
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<td class="diff-line-num new new_line" data-linenumber="56" style="background: #ddfbe6; border-right-color: #c7f0d2; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0"> <span id="LC56" class="line"> <span class="n" style="color: #333">u</span> <span class="o" style="font-weight: bold">=</span> <span class="n" style="color: #333">tr</span><span class="p">.</span><span class="n" style="color: #333">tv_sec</span> <span class="o" style="font-weight: bold">*</span> <span class="n" style="color: #333"><span class="idiff left">NANOSECONDS</span></span><span class="idiff"> </span><span class="o" style="font-weight: bold"><span class="idiff">+</span></span><span class="idiff"> </span><span class="n" style="color: #333"><span class="idiff">tr</span></span><span class="p"><span class="idiff">.</span></span><span class="n" style="color: #333"><span class="idiff right">tv_n</span>sec</span><span class="p">;</span> </span>
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<pre style="margin: 0"> <span id="LC57" class="line"> <span class="k" style="font-weight: bold">if</span> <span class="p">(</span><span class="n" style="color: #333">u</span> <span class="o" style="font-weight: bold">-</span> <span class="n" style="color: #333">v</span> <span class="o" style="font-weight: bold">></span> <span class="n" style="color: #333">NCNT</span><span class="p">)</span></span>
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<pre style="margin: 0"> <span id="LC58" class="line"> <span class="k" style="font-weight: bold">break</span><span class="p">;</span></span>
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<td class="diff-line-num old_line" data-linenumber="57" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
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<pre style="margin: 0"> <span id="LC59" class="line"> <span class="n" style="color: #333">w</span> <span class="o" style="font-weight: bold">=</span> <span class="n" style="color: #333">u</span> <span class="o" style="font-weight: bold">-</span> <span class="n" style="color: #333">t</span><span class="p">;</span></span>
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<td class="diff-line-num old_line" data-linenumber="58" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
58
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60
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<pre style="margin: 0"> <span id="LC60" class="line"> <span class="k" style="font-weight: bold">if</span> <span class="p">(</span><span class="n" style="color: #333">w</span> <span class="o" style="font-weight: bold"><=</span> <span class="mi" style="color: #099">0</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="diff-line-num old_line" data-linenumber="59" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
59
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<pre style="margin: 0"> <span id="LC61" class="line"><span class="cm" style="color: #998; font-style: italic">/*</span></span>
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<td class="diff-line-num old_line" data-linenumber="60" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="62" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
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<pre style="margin: 0"> <span id="LC62" class="line"><span class="cm" style="color: #998; font-style: italic"> printf("error <= 0 %ld %ld %ld, %ld %ld\n", w,</span></span>
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<td class="diff-line-num old old_line" data-linenumber="61" style="background: #f9d7dc; border-right-color: #fac5cd; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#f9d7dc">
61
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<td class="diff-line-num new_line old" data-linenumber="63" style="background: #f9d7dc; border-right-color: #fac5cd; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0"> <span id="LC61" class="line"><span class="cm" style="color: #998; font-style: italic"> (long)ts.tv_sec, (long)ts.tv_<span class="idiff left right">u</span>sec,</span></span>
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62
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<td class="diff-line-num new_line old" data-linenumber="63" style="background: #f9d7dc; border-right-color: #fac5cd; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0"> <span id="LC62" class="line"><span class="cm" style="color: #998; font-style: italic"> (long)tr.tv_sec, (long)tr.tv_<span class="idiff left right">u</span>sec);</span></span>
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<pre style="margin: 0"> <span id="LC63" class="line"><span class="cm" style="color: #998; font-style: italic"> (long)ts.tv_sec, (long)ts.tv_<span class="idiff left right">n</span>sec,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="64" style="background: #ddfbe6; border-right-color: #c7f0d2; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0"> <span id="LC64" class="line"><span class="cm" style="color: #998; font-style: italic"> (long)tr.tv_sec, (long)tr.tv_<span class="idiff left right">n</span>sec);</span></span>
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63
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<td class="diff-line-num new_line" data-linenumber="65" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
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<pre style="margin: 0"> <span id="LC65" class="line"><span class="cm" style="color: #998; font-style: italic">*/</span></span>
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64
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<td class="diff-line-num new_line" data-linenumber="66" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
66
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<pre style="margin: 0"> <span id="LC66" class="line"> <span class="p">}</span> <span class="k" style="font-weight: bold">else</span> <span class="k" style="font-weight: bold">if</span> <span class="p">(</span><span class="n" style="color: #333">w</span> <span class="o" style="font-weight: bold">></span> <span class="n" style="color: #333">NBUF</span> <span class="o" style="font-weight: bold">-</span> <span class="mi" style="color: #099">1</span><span class="p">)</span> <span class="p">{</span></span>
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67
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<pre style="margin: 0"> <span id="LC67" class="line"> <span class="n" style="color: #333">ovfl</span><span class="p">[</span><span class="n" style="color: #333">n</span><span class="p">]</span> <span class="o" style="font-weight: bold">=</span> <span class="n" style="color: #333">w</span><span class="p">;</span></span>
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