168 lines
3.6 KiB
HTML
168 lines
3.6 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of UNLOCKPT</TITLE>
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</HEAD><BODY>
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<H1>UNLOCKPT</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2017-07-13<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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unlockpt - unlock a pseudoterminal master/slave pair
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>#define _XOPEN_SOURCE</B>
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<BR>
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<B>#include <<A HREF="file:///usr/include/stdlib.h">stdlib.h</A>></B>
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<P>
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<B>int unlockpt(int </B><I>fd</I><B>);</B>
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<P>
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Feature Test Macro Requirements for glibc (see
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<B><A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A></B>(7)):
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<P>
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<B>unlockpt</B>():
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<BR>
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<DL COMPACT><DT id="1"><DD>
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Since glibc 2.24:
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<BR> _XOPEN_SOURCE >= 500 ||
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<BR> (_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED)
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<BR>
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Glibc 2.23 and earlier:
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<BR> _XOPEN_SOURCE
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</DL>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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The
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<B>unlockpt</B>()
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function unlocks the slave pseudoterminal device
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corresponding to the master pseudoterminal referred to by
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<I>fd</I>.
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<P>
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<B>unlockpt</B>()
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should be called before opening the slave side of a pseudoterminal.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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When successful,
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<B>unlockpt</B>()
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returns 0.
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Otherwise, it returns -1 and sets
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<I>errno</I>
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appropriately.
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<A NAME="lbAF"> </A>
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<H2>ERRORS</H2>
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<DL COMPACT>
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<DT id="2"><B>EBADF</B>
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<DD>
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The
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<I>fd</I>
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argument is not a file descriptor open for writing.
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<DT id="3"><B>EINVAL</B>
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<DD>
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The
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<I>fd</I>
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argument is not associated with a master pseudoterminal.
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</DL>
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<A NAME="lbAG"> </A>
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<H2>VERSIONS</H2>
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<B>unlockpt</B>()
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is provided in glibc since version 2.1.
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<A NAME="lbAH"> </A>
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<H2>ATTRIBUTES</H2>
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For an explanation of the terms used in this section, see
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<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
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<TABLE BORDER>
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<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>unlockpt</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe<BR></TD></TR>
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</TABLE>
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<A NAME="lbAI"> </A>
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<H2>CONFORMING TO</H2>
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POSIX.1-2001, POSIX.1-2008.
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<A NAME="lbAJ"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?3+grantpt">grantpt</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+posix_openpt">posix_openpt</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+ptsname">ptsname</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?4+pts">pts</A></B>(4),
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<B><A HREF="/cgi-bin/man/man2html?7+pty">pty</A></B>(7)
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<A NAME="lbAK"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="4"><A HREF="#lbAB">NAME</A><DD>
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<DT id="5"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="6"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="7"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="8"><A HREF="#lbAF">ERRORS</A><DD>
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<DT id="9"><A HREF="#lbAG">VERSIONS</A><DD>
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<DT id="10"><A HREF="#lbAH">ATTRIBUTES</A><DD>
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<DT id="11"><A HREF="#lbAI">CONFORMING TO</A><DD>
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<DT id="12"><A HREF="#lbAJ">SEE ALSO</A><DD>
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<DT id="13"><A HREF="#lbAK">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:59 GMT, March 31, 2021
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</BODY>
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</HTML>
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