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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>mq_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_007_782"> </a>NAME</h4><blockquote>mq_unlink - remove a message queue(<b>REALTIME</b>)</blockquote><h4><a name = "tag_000_007_783"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="mqueue.h.html">mqueue.h</a>>int mq_unlink(const char *<i>name</i>);</code></pre></blockquote><h4><a name = "tag_000_007_784"> </a>DESCRIPTION</h4><blockquote>The<i>mq_unlink()</i>function removes the message queue named by the pathname<i>name</i>.After a successful call to<i>mq_unlink()</i>with<i>name</i>,a call to<i><a href="mq_open.html">mq_open()</a></i>with<i>name</i>fails if the flag O_CREAT is not set in<i>flags</i>.If one or more processes have the message queue open when<i>mq_unlink()</i>is called, destruction of the message queue is postponeduntil all references to the message queue have been closed.Calls to<i><a href="mq_open.html">mq_open()</a></i>to re-create the message queue may failuntil the message queue is actually removed.However, the<i>mq_unlink()</i>call need not block until all references have been closed;it may return immediately.</blockquote><h4><a name = "tag_000_007_785"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,the function returns a value of zero.Otherwise,the named message queue is unchanged by this function call,and the function returns a value of -1 and sets<i>errno</i>to indicate the error.</blockquote><h4><a name = "tag_000_007_786"> </a>ERRORS</h4><blockquote>The <i>mq_unlink()</i>function will fail if:<dl compact><dt>[EACCES]<dd>Permission is denied to unlink the namedmessage queue.<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 message queuedoes not exist.<dt>[ENOSYS]<dd>The function<i>mq_unlink()</i>is not supported by this implementation.</dl></blockquote><h4><a name = "tag_000_007_787"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_788"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_789"> </a>SEE ALSO</h4><blockquote><i><a href="mq_close.html">mq_close()</a></i>,<i><a href="mq_open.html">mq_open()</a></i>,<i><a href="mqueue.h.html"><mqueue.h></a></i>,<i><a href="msgctl.html">msgctl()</a></i>,<i><a href="msgget.html">msgget()</a></i>,<i><a href="msgrcv.html">msgrcv()</a></i>,<i><a href="msgsnd.html">msgsnd()</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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