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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
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-<table class="head">
- <tr>
- <td class="head-ltitle">TIMERADD(3)</td>
- <td class="head-vol">Library Functions Manual</td>
- <td class="head-rtitle">TIMERADD(3)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">timeradd</code>,
- <code class="Nm">timersub</code>, <code class="Nm">timerclear</code>,
- <code class="Nm">timerisset</code>, <code class="Nm">timercmp</code>,
- <code class="Nm">timespecadd</code>, <code class="Nm">timespecsub</code>,
- <code class="Nm">timespecclear</code>,
- <code class="Nm">timespecisset</code>, <code class="Nm">timespeccmp</code>
- &#x2014; <span class="Nd">operations on timevals and timespecs</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="In">#include
- &lt;<a class="In">sys/time.h</a>&gt;</code></p>
-<p class="Pp"><var class="Ft">void</var>
- <br/>
- <code class="Fn">timeradd</code>(<var class="Fa" style="white-space: nowrap;">struct
- timeval *a</var>, <var class="Fa" style="white-space: nowrap;">struct
- timeval *b</var>, <var class="Fa" style="white-space: nowrap;">struct
- timeval *res</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
- <br/>
- <code class="Fn">timersub</code>(<var class="Fa" style="white-space: nowrap;">struct
- timeval *a</var>, <var class="Fa" style="white-space: nowrap;">struct
- timeval *b</var>, <var class="Fa" style="white-space: nowrap;">struct
- timeval *res</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
- <br/>
- <code class="Fn">timerclear</code>(<var class="Fa" style="white-space: nowrap;">struct
- timeval *tvp</var>);</p>
-<p class="Pp"><var class="Ft">int</var>
- <br/>
- <code class="Fn">timerisset</code>(<var class="Fa" style="white-space: nowrap;">struct
- timeval *tvp</var>);</p>
-<p class="Pp"><var class="Ft">int</var>
- <br/>
- <code class="Fn">timercmp</code>(<var class="Fa" style="white-space: nowrap;">struct
- timeval *a</var>, <var class="Fa" style="white-space: nowrap;">struct
- timeval *b</var>,
- <var class="Fa" style="white-space: nowrap;">CMP</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
- <br/>
- <code class="Fn">timespecadd</code>(<var class="Fa" style="white-space: nowrap;">struct
- timespec *a</var>, <var class="Fa" style="white-space: nowrap;">struct
- timespec *b</var>, <var class="Fa" style="white-space: nowrap;">struct
- timespec *res</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
- <br/>
- <code class="Fn">timespecsub</code>(<var class="Fa" style="white-space: nowrap;">struct
- timespec *a</var>, <var class="Fa" style="white-space: nowrap;">struct
- timespec *b</var>, <var class="Fa" style="white-space: nowrap;">struct
- timespec *res</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
- <br/>
- <code class="Fn">timespecclear</code>(<var class="Fa" style="white-space: nowrap;">struct
- timespec *ts</var>);</p>
-<p class="Pp"><var class="Ft">int</var>
- <br/>
- <code class="Fn">timespecisset</code>(<var class="Fa" style="white-space: nowrap;">struct
- timespec *ts</var>);</p>
-<p class="Pp"><var class="Ft">int</var>
- <br/>
- <code class="Fn">timespeccmp</code>(<var class="Fa" style="white-space: nowrap;">struct
- timespec *a</var>, <var class="Fa" style="white-space: nowrap;">struct
- timespec *b</var>,
- <var class="Fa" style="white-space: nowrap;">CMP</var>);</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">These macros are provided for manipulating
- <var class="Fa">timeval</var> and <var class="Fa">timespec</var> structures
- for use with the <a class="Xr">clock_gettime(2)</a>,
- <a class="Xr">clock_settime(2)</a>, <a class="Xr">gettimeofday(2)</a> and
- <a class="Xr">settimeofday(2)</a> calls. The <var class="Fa">timeval</var>
- structure is defined in
- <code class="In">&lt;<a class="In">sys/time.h</a>&gt;</code> as:</p>
-<div class="Bd Pp Li">
-<pre>struct timeval {
- long tv_sec; /* seconds since Jan. 1, 1970 */
- long tv_usec; /* and microseconds */
-};</pre>
-</div>
-<p class="Pp">And the <var class="Fa">timespec</var> structure is defined in
- <code class="In">&lt;<a class="In">time.h</a>&gt;</code> as:</p>
-<div class="Bd Pp Li">
-<pre>struct timespec {
- time_t tv_sec; /* seconds */
- long tv_nsec; /* and nanoseconds */
-};</pre>
-</div>
-<p class="Pp" id="timeradd"><a class="permalink" href="#timeradd"><code class="Fn">timeradd</code></a>()
- and
- <a class="permalink" href="#timespecadd"><code class="Fn" id="timespecadd">timespecadd</code></a>()
- add the time information stored in <var class="Fa">a</var> to
- <var class="Fa">b</var> and store the result in <var class="Fa">res</var>.
- The results are simplified such that the value of
- <var class="Fa">res-&gt;tv_usec</var> or
- <var class="Fa">res-&gt;tv_nsec</var> is always less than 1 second.</p>
-<p class="Pp" id="timersub"><a class="permalink" href="#timersub"><code class="Fn">timersub</code></a>()
- and
- <a class="permalink" href="#timespecsub"><code class="Fn" id="timespecsub">timespecsub</code></a>()
- subtract the time information stored in <var class="Fa">b</var> from
- <var class="Fa">a</var> and store the result in
- <var class="Fa">res</var>.</p>
-<p class="Pp" id="timerclear"><a class="permalink" href="#timerclear"><code class="Fn">timerclear</code></a>()
- and
- <a class="permalink" href="#timespecclear"><code class="Fn" id="timespecclear">timespecclear</code></a>()
- initialize their argument to midnight (0 hour) January 1st, 1970 (the
- Epoch).</p>
-<p class="Pp" id="timerisset"><a class="permalink" href="#timerisset"><code class="Fn">timerisset</code></a>()
- and
- <a class="permalink" href="#timespecisset"><code class="Fn" id="timespecisset">timespecisset</code></a>()
- return true if their argument is set to any time value other than the
- Epoch.</p>
-<p class="Pp" id="timercmp"><a class="permalink" href="#timercmp"><code class="Fn">timercmp</code></a>()
- and
- <a class="permalink" href="#timespeccmp"><code class="Fn" id="timespeccmp">timespeccmp</code></a>()
- compare <var class="Fa">a</var> to <var class="Fa">b</var> using the
- comparison operator given in <var class="Fa">CMP</var>, and return the
- result of that comparison.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">clock_gettime(2)</a>,
- <a class="Xr">gettimeofday(2)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Fn">timeradd</code>() family of macros were
- imported from <span class="Ux">NetBSD 1.1</span>, and appeared in
- <span class="Ux">FreeBSD 2.2.6</span>. The
- <code class="Fn">timespecadd</code>() family of macros were imported from
- <span class="Ux">NetBSD 1.3</span> into <span class="Ux">FreeBSD 3.0</span>,
- though they were not exposed to userland until <span class="Ux">FreeBSD
- 12.0</span>.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">July 30, 2018</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>