shmdt.html
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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>shmdt</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_008_561"> </a>NAME</h4><blockquote>shmdt - shared memory detach operation</blockquote><h4><a name = "tag_000_008_562"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="sysshm.h.html">sys/shm.h</a>>int shmdt(const void *<i>shmaddr</i>);</code></pre></blockquote><h4><a name = "tag_000_008_563"> </a>DESCRIPTION</h4><blockquote>The<i>shmdt()</i>function detaches the shared memory segment located at the addressspecified by<i>shmaddr</i>.from the address space of the calling process.</blockquote><h4><a name = "tag_000_008_564"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>shmdt()</i>will decrement the value of<i>shm_nattch</i>in the data structure associated with the shared memory ID of the attachedshared memory segment and return 0.<p>Otherwise, the shared memory segment will not be detached,<i>shmdt()</i>will return -1 and<i>errno</i>will be set to indicate the error.</blockquote><h4><a name = "tag_000_008_565"> </a>ERRORS</h4><blockquote>The<i>shmdt()</i>function will fail if:<dl compact><dt>[EINVAL]<dd>The value of<i>shmaddr</i>is not the data segment start address of a shared memory segment.</dl></blockquote><h4><a name = "tag_000_008_566"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_567"> </a>APPLICATION USAGE</h4><blockquote>The POSIX Realtime Extension defines alternative interfaces for interprocess communication.Application developers who need to use IPC should design theirapplications so that modules using the IPC routines described in<a href="ipc.html">IPC</a>can be easily modified to use the alternative interfaces.</blockquote><h4><a name = "tag_000_008_568"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_569"> </a>SEE ALSO</h4><blockquote><i><a href="exec.html">exec</a></i>,<i><a href="exit.html">exit()</a></i>,<i><a href="fork.html">fork()</a></i>,<i><a href="shmat.html">shmat()</a></i>,<i><a href="shmctl.html">shmctl()</a></i>,<i><a href="shmget.html">shmget()</a></i>,<i><a href="shm_open.html">shm_open()</a></i>,<i><a href="shm_unlink.html">shm_unlink()</a></i>,<i><a href="sysshm.h.html"><sys/shm.h></a></i>,<a href="ipc.html">IPC</a>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from Issue 2 of the SVID.</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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