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-<table class="head">
- <tr>
- <td class="head-ltitle">PTHREAD_ATFORK(3)</td>
- <td class="head-vol">Library Functions Manual</td>
- <td class="head-rtitle">PTHREAD_ATFORK(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">pthread_atfork</code> &#x2014;
- <span class="Nd">register fork handlers</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="LIBRARY"><a class="permalink" href="#LIBRARY">LIBRARY</a></h1>
-<p class="Pp"><span class="Lb">POSIX Threads Library (libpthread,
- -lpthread)</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">pthread.h</a>&gt;</code></p>
-<p class="Pp"><var class="Ft">int</var>
- <br/>
- <code class="Fn">pthread_atfork</code>(<var class="Fa">void
- (*prepare)(void)</var>, <var class="Fa">void (*parent)(void)</var>,
- <var class="Fa">void (*child)(void)</var>);</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The
- <a class="permalink" href="#pthread_atfork"><code class="Fn" id="pthread_atfork">pthread_atfork</code></a>()
- function declares fork handlers to be called before and after
- <a class="Xr">fork(2)</a>, in the context of the thread that called
- <a class="Xr">fork(2)</a>.</p>
-<p class="Pp" id="pthread_atfork~2">The handlers registered with
- <a class="permalink" href="#pthread_atfork~2"><code class="Fn">pthread_atfork</code></a>()
- are called at the moments in time described below:</p>
-<dl class="Bl-tag">
- <dt><var class="Fa">prepare</var></dt>
- <dd>Before <a class="Xr">fork(2)</a> processing commences in the parent
- process. If more than one <var class="Fa">prepare</var> handler is
- registered they will be called in the opposite order they were
- registered.</dd>
- <dt><var class="Fa">parent</var></dt>
- <dd>After <a class="Xr">fork(2)</a> completes in the parent process. If more
- than one <var class="Fa">parent</var> handler is registered they will be
- called in the same order they were registered.</dd>
- <dt><var class="Fa">child</var></dt>
- <dd>After <a class="Xr">fork(2)</a> processing completes in the child process.
- If more than one <var class="Fa">child</var> handler is registered they
- will be called in the same order they were registered.</dd>
-</dl>
-<p class="Pp">If no handling is desired at one or more of these three points, a
- null pointer may be passed as the corresponding fork handler.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="RETURN_VALUES"><a class="permalink" href="#RETURN_VALUES">RETURN
- VALUES</a></h1>
-<p class="Pp">If successful, the <code class="Fn">pthread_atfork</code>()
- function will return zero. Otherwise an error number will be returned to
- indicate the error.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="ERRORS"><a class="permalink" href="#ERRORS">ERRORS</a></h1>
-<p class="Pp">The <code class="Fn">pthread_atfork</code>() function will fail
- if:</p>
-<dl class="Bl-tag">
- <dt id="ENOMEM">[<a class="permalink" href="#ENOMEM"><code class="Er">ENOMEM</code></a>]</dt>
- <dd>Insufficient table space exists to record the fork handler addresses.</dd>
-</dl>
-</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">fork(2)</a>, <a class="Xr">pthread(3)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="STANDARDS"><a class="permalink" href="#STANDARDS">STANDARDS</a></h1>
-<p class="Pp">The <code class="Fn">pthread_atfork</code>() function is expected
- to conform to <span class="St">IEEE Std 1003.1
- (&#x201C;POSIX.1&#x201D;)</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">This manpage was written by <span class="An">Alex Vasylenko</span>
- &lt;<a class="Mt" href="mailto:lxv@omut.org">lxv@omut.org</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">June 21, 2004</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>