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<h3>
Eric S. Raymond pushed to branch master
at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>
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<h4>
Commits:
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<ul>
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<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/f96d85a3e781877ee26fdc0e8c067f6443b0c40b">f96d85a3</a></strong>
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<span>by Eric S. Raymond</span>
<i>at 2016-10-01T17:28:48-04:00</i>
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<pre class="commit-message" style="margin: 0; white-space: pre-wrap">Much-needed clarification of the system clock API.
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<h4>1 changed file:</h4>
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<a href="#diff-0" style="text-decoration: none">
devel/tour.txt
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<h4>Changes:</h4>
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<a href="https://gitlab.com/NTPsec/ntpsec/commit/f96d85a3e781877ee26fdc0e8c067f6443b0c40b#diff-0"><strong>devel/tour.txt</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">@@ -167,9 +167,40 @@ quite a while before NTPsec removed it.</td>
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<pre style="margin: 0"> <span id="LC167" class="line">== System call interface and the PLL ==</span>
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<pre style="margin: 0"> <span id="LC168" class="line"></span>
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<pre style="margin: 0"> <span id="LC169" class="line">All of ntpd's clock management is done through four system calls:</span>
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<pre style="margin: 0"> <span id="LC170" class="line">clock_gettime(2), clock_settime(2), ntp_adjtime(2), and (on some</span>
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<pre style="margin: 0"> <span id="LC171" class="line">systems) adjtimex(). The settimeofday(2) call from older BSD</span>
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172
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<pre style="margin: 0"> <span id="LC172" class="line">Unuxes (in POSIX but deprecated) is no longer used.</span>
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<td class="diff-line-num new new_line" data-linenumber="170" 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="LC170" class="line">clock_gettime(2), clock_settime(2), and either ntp_adjtime(2) or (on</span>
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<pre style="margin: 0"> <span id="LC171" class="line">some systems, including Linux) adjtimex(2).</span>
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<pre style="margin: 0"> <span id="LC172" class="line"></span>
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<pre style="margin: 0"> <span id="LC173" class="line">The clock_gettime(2) and clock_settime(2) calls are standardized in</span>
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<pre style="margin: 0"> <span id="LC174" class="line">POSIX; ntp_adjtime(3) and adjtimex(2) are not, exhibiting some</span>
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<pre style="margin: 0"> <span id="LC175" class="line">variability in behavior across platforms. Where adjtimex(2) exists</span>
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<pre style="margin: 0"> <span id="LC176" class="line">(notably under Linux), ntp_adjtime(2) is implemented as a thin</span>
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<pre style="margin: 0"> <span id="LC177" class="line">userspace wrapper around it.</span>
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<pre style="margin: 0"> <span id="LC178" class="line"></span>
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<pre style="margin: 0"> <span id="LC179" class="line">There is some confusion abroad about this interface because it has</span>
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<pre style="margin: 0"> <span id="LC180" class="line">left a trail of abandoned experiments behind it.</span>
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181
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<pre style="margin: 0"> <span id="LC181" class="line"></span>
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<pre style="margin: 0"> <span id="LC182" class="line">Older BSD systems read the clock using gettimeofday(2) </span>
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<pre style="margin: 0"> <span id="LC183" class="line">(in POSIX but deprecated) and set it using settimeofday(2),</span>
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<pre style="margin: 0"> <span id="LC184" class="line">which was never standardized. There was also an adjtime(2)</span>
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<td class="diff-line-num new new_line" data-linenumber="185" 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">
185
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<pre style="margin: 0"> <span id="LC185" class="line">call similar to, but less powerful than, ntp_adjtime(2)/adjtimex(2).</span>
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186
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<pre style="margin: 0"> <span id="LC186" class="line">None of these calls are still used in NTPsec.</span>
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187
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<pre style="margin: 0"> <span id="LC187" class="line"></span>
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<td class="diff-line-num new new_line" data-linenumber="188" 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">
188
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<pre style="margin: 0"> <span id="LC188" class="line">Also, glibc (and possibly other C libraries) implement two other</span>
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<td class="diff-line-num new new_line" data-linenumber="189" 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">
189
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<pre style="margin: 0"> <span id="LC189" class="line">related calls, ntp_gettime(3) and ntp_gettimex(3). These are not used</span>
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190
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<pre style="margin: 0"> <span id="LC190" class="line">by the NTP suite itself (except that the ntptime test program attempts</span>
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<td class="diff-line-num new new_line" data-linenumber="191" 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">
191
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<pre style="margin: 0"> <span id="LC191" class="line">to exercise ntp_gettime(3)), but rather are intended for time-using</span>
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<td class="diff-line-num new new_line" data-linenumber="192" 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">
192
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<pre style="margin: 0"> <span id="LC192" class="line">applications that also want an estimate of clock error and the</span>
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<td class="diff-line-num new new_line" data-linenumber="193" 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">
193
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<pre style="margin: 0"> <span id="LC193" class="line">leap-second offset. Neither has been standardized by POSIX, and they</span>
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194
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<pre style="margin: 0"> <span id="LC194" class="line">have not achieved wide use in applications.</span>
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195
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<pre style="margin: 0"> <span id="LC195" class="line"></span>
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196
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<pre style="margin: 0"> <span id="LC196" class="line">Both ntp_gettime(3) and ntp_gettimex(3) can be implemented as wrappers</span>
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197
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<pre style="margin: 0"> <span id="LC197" class="line">around ntp_adjtime(2)/adjtimex(2). Thus, on a Linux system, the</span>
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<td class="diff-line-num new new_line" data-linenumber="198" 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">
198
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<pre style="margin: 0"> <span id="LC198" class="line">library ntp_gettime(3) call could conceivably go through two levels </span>
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<td class="diff-line-num new new_line" data-linenumber="199" 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">
199
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<pre style="margin: 0"> <span id="LC199" class="line">of indirection, being implemented in terms of ntp_adjtime(2) which</span>
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200
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<pre style="margin: 0"> <span id="LC200" class="line">is in turn implemented by adjtimex(2).</span>
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201
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<pre style="margin: 0"> <span id="LC201" class="line"></span>
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202
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<pre style="margin: 0"> <span id="LC202" class="line">Unhelpfully, the non-POSIX calls in the above assortment are very</span>
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203
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<pre style="margin: 0"> <span id="LC203" class="line">poorly documented.</span>
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173
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204
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<pre style="margin: 0"> <span id="LC204" class="line"></span>
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174
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205
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<pre style="margin: 0"> <span id="LC205" class="line">The roles of clock_gettime(2) and clock_settime(2) are simple.</span>
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<td class="diff-line-num old_line" data-linenumber="175" 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">
175
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206
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<pre style="margin: 0"> <span id="LC206" class="line">They're used for reading and setting ("stepping", in NTP jargon) the</span>
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