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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>pthread_atfork</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_007_1027"> </a>NAME</h4><blockquote>pthread_atfork - register fork handlers</blockquote><h4><a name = "tag_000_007_1028"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="systypes.h.html">sys/types.h</a>>#include <<a href="unistd.h.html">unistd.h</a>>int pthread_atfork(void (*<i>prepare</i>)(void), void (*<i>parent</i>)(void), void (*<i>child</i>)(void));</code></pre></blockquote><h4><a name = "tag_000_007_1029"> </a>DESCRIPTION</h4><blockquote>The<i>pthread_atfork()</i>function declares fork handlersto be called before and after<i><a href="fork.html">fork()</a></i>,in the context of the thread that called<i><a href="fork.html">fork()</a></i>.The<i>prepare</i>fork handler is called before<i><a href="fork.html">fork()</a></i>processing commences.The<i>parent</i>fork handle is called after<i><a href="fork.html">fork()</a></i>processing completes in the parent process.The<i>child</i>fork handler is called after<i><a href="fork.html">fork()</a></i>processing completes in the child process.If no handling is desired at one or more of these three points,the corresponding fork handleraddress(es) may be set to NULL.<p>The order of calls to<i>pthread_atfork()</i>is significant.The<i>parent</i>and<i>child</i>fork handlers are called in the orderin which they were established by calls to<i>pthread_atfork()</i>.The<i>prepare</i>fork handlers are called in the opposite order.</blockquote><h4><a name = "tag_000_007_1030"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>pthread_atfork()</i>returns a value of zero.Otherwise, an error number is returned to indicate the error.</blockquote><h4><a name = "tag_000_007_1031"> </a>ERRORS</h4><blockquote>The <i>pthread_atfork()</i>function will fail if:<dl compact><dt>[ENOMEM]<dd>Insufficient table space exists to record thefork handler addresses.</dl><p>The <i>pthread_atfork()</i>function will not return an error code of [EINTR].</blockquote><h4><a name = "tag_000_007_1032"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1033"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1034"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1035"> </a>SEE ALSO</h4><blockquote><i><a href="atexit.html">atexit()</a></i>,<i><a href="fork.html">fork()</a></i>,<i><a href="systypes.h.html"><sys/types.h></a></i></blockquote><h4>DERIVATION</h4><blockquote>Derived from the POSIX Threads Extension (1003.1c-1995) including PASC 1003.1c-95.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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