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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>shm_unlink</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_534"> </a>NAME</h4><blockquote>shm_unlink - remove a shared memory object(<b>REALTIME</b>)</blockquote><h4><a name = "tag_000_008_535"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="sysmman.h.html">sys/mman.h</a>>int shm_unlink(const char * <i>name</i>);</code></pre></blockquote><h4><a name = "tag_000_008_536"> </a>DESCRIPTION</h4><blockquote>The<i>shm_unlink()</i>function removes the name of the shared memory object named by thestring pointed to by<i>name</i>.If one or more references to the shared memory object existwhen the object is unlinked,the name is removed before<i>shm_unlink()</i>returns, but the removal of the memory object contents is postponeduntil all open and map referencesto the shared memory object have been removed.</blockquote><h4><a name = "tag_000_008_537"> </a>RETURN VALUE</h4><blockquote>Upon successful completion, a value of zero is returned.Otherwise, a value of -1 is returned and<i>errno</i>will be set to indicate the error.If -1 is returned,the named shared memory object will not be changed by this function call.</blockquote><h4><a name = "tag_000_008_538"> </a>ERRORS</h4><blockquote>The <i>shm_unlink()</i>function will fail if:<dl compact><dt>[EACCES]<dd>Permission is denied to unlink the namedshared memory object.<dt>[ENAMETOOLONG]<dd>The length of the<i>name</i>string exceeds {NAME_MAX} while_POSIX_NO_TRUNC is in effect.<dt>[ENOENT]<dd>The named shared memory objectdoes not exist.<dt>[ENOSYS]<dd>The function<i>shm_unlink()</i>is not supported by this implementation.</dl></blockquote><h4><a name = "tag_000_008_539"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_540"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_541"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_542"> </a>SEE ALSO</h4><blockquote><i><a href="close.html">close()</a></i>,<i><a href="mmap.html">mmap()</a></i>,<i><a href="munmap.html">munmap()</a></i>,<i><a href="shmat.html">shmat()</a></i>,<i><a href="shmctl.html">shmctl()</a></i>,<i><a href="shmdt.html">shmdt()</a></i>,<i><a href="shm_open.html">shm_open()</a></i>,<i><a href="sysmman.h.html"><sys/mman.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the POSIX Realtime Extension (1003.1b-1993/1003.1i-1995)</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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