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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>unlockpt</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_010_289"> </a>NAME</h4><blockquote>unlockpt - unlock a pseudo-terminal master/slave pair</blockquote><h4><a name = "tag_000_010_290"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="stdlib.h.html">stdlib.h</a>>int unlockpt(int <i>fildes</i>);</code></pre></blockquote><h4><a name = "tag_000_010_291"> </a>DESCRIPTION</h4><blockquote>The<i>unlockpt()</i>function unlocks the slave pseudo-terminal device associated with the masterto which <i>fildes</i> refers.<p>Portable applications must call<i>unlockpt()</i>before opening the slave side of a pseudo-terminal device.</blockquote><h4><a name = "tag_000_010_292"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>unlockpt()</i>returns 0. Otherwise, it returns -1 and sets<i>errno</i>to indicate the error.</blockquote><h4><a name = "tag_000_010_293"> </a>ERRORS</h4><blockquote>The<i>unlockpt()</i>function may fail if:<dl compact><dt>[EBADF]<dd>The <i>fildes</i> argument is not a file descriptor open for writing.<dt>[EINVAL]<dd>The <i>fildes</i> argument is not associated with a master pseudo-terminaldevice.</dl></blockquote><h4><a name = "tag_000_010_294"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_295"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_296"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_297"> </a>SEE ALSO</h4><blockquote><i><a href="grantpt.html">grantpt()</a></i>,<i><a href="open.html">open()</a></i>,<i><a href="ptsname.html">ptsname()</a></i>,<i><a href="stdlib.h.html"><stdlib.h></a></i>.</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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