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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2004 IEEE and The Open Group, All Rights Reserved --><title>unlockpt</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="unlockpt"></a> <a name="tag_03_803"></a><!-- unlockpt --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2004 Edition<br>Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_803_01"></a>NAME</h4><blockquote>unlockpt - unlock a pseudo-terminal master/slave pair</blockquote><h4><a name="tag_03_803_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/stdlib.h.html">stdlib.h</a>><br><br> int unlockpt(int</tt> <i>fildes</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div><tt><br></tt></blockquote><h4><a name="tag_03_803_03"></a>DESCRIPTION</h4><blockquote><p>The <i>unlockpt</i>() function shall unlock the slave pseudo-terminal device associated with the master to which <i>fildes</i>refers.</p><p>Conforming applications shall ensure that they call <i>unlockpt</i>() before opening the slave side of a pseudo-terminaldevice.</p></blockquote><h4><a name="tag_03_803_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, <i>unlockpt</i>() shall return 0. Otherwise, it shall return -1 and set <i>errno</i> to indicate theerror.</p></blockquote><h4><a name="tag_03_803_05"></a>ERRORS</h4><blockquote><p>The <i>unlockpt</i>() function may fail if:</p><dl compact><dt>[EBADF]</dt><dd>The <i>fildes</i> argument is not a file descriptor open for writing.</dd><dt>[EINVAL]</dt><dd>The <i>fildes</i> argument is not associated with a master pseudo-terminal device.</dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_803_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_803_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_803_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_803_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_803_10"></a>SEE ALSO</h4><blockquote><p><a href="grantpt.html"><i>grantpt</i>()</a>, <a href="open.html"><i>open</i>()</a>, <a href="ptsname.html"><i>ptsname</i>()</a>, the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/stdlib.h.html"><i><stdlib.h></i></a></p></blockquote><h4><a name="tag_03_803_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 4, Version 2.</p></blockquote><h4><a name="tag_03_803_12"></a>Issue 5</h4><blockquote><p>Moved from X/OPEN UNIX extension to BASE.</p></blockquote><h4><a name="tag_03_803_13"></a>Issue 6</h4><blockquote><p>The DESCRIPTION is updated to avoid use of the term "must" for application requirements.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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