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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_close</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_726"> </a>NAME</h4><blockquote>mq_close - close a message queue(<b>REALTIME</b>)</blockquote><h4><a name = "tag_000_007_727"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="mqueue.h.html">mqueue.h</a>>int mq_close(mqd_t <i>mqdes</i>);</code></pre></blockquote><h4><a name = "tag_000_007_728"> </a>DESCRIPTION</h4><blockquote>The<i>mq_close()</i>function removes the association between the message queue descriptor,<i>mqdes</i>,and its message queue.The results of using this message queue descriptor after successfulreturn from this<i>mq_close()</i>,and until the return of this message queue descriptor from a subsequent<i><a href="mq_open.html">mq_open()</a></i>,are undefined.<p>If the process has successfully attached a notification requestto the message queue via this<i>mqdes</i>,this attachment will be removed,and the message queue is availablefor another process to attach for notification.</blockquote><h4><a name = "tag_000_007_729"> </a>RETURN VALUE</h4><blockquote>Upon successful completion, the<i>mq_close()</i>function returns a value of zero;otherwise, the function returns a value of -1 and sets<i>errno</i>to indicate the error.</blockquote><h4><a name = "tag_000_007_730"> </a>ERRORS</h4><blockquote>The <i>mq_close()</i>function will fail if:<dl compact><dt>[EBADF]<dd>The<i>mqdes</i>argument is not a valid message queue descriptor.<dt>[ENOSYS]<dd>The function<i>mq_close()</i>is not supported by this implementation.</dl></blockquote><h4><a name = "tag_000_007_731"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_732"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_733"> </a>SEE ALSO</h4><blockquote><i><a href="mq_open.html">mq_open()</a></i>,<i><a href="mq_unlink.html">mq_unlink()</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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