241 lines
5.0 KiB
HTML
241 lines
5.0 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 PTSNAME</TITLE>
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</HEAD><BODY>
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<H1>PTSNAME</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2017-09-15<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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ptsname, ptsname_r - get the name of the slave pseudoterminal
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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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>char *ptsname(int </B><I>fd</I><B>);</B>
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<BR>
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<B>int ptsname_r(int </B><I>fd</I><B>, char *</B><I>buf</I><B>, size_t </B><I>buflen</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>ptsname</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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<P>
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<B>ptsname_r</B>():
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<BR> _GNU_SOURCE
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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>ptsname</B>()
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function returns the name of the slave pseudoterminal device
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corresponding to the master referred to by
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<I>fd</I>.
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<P>
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The
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<B>ptsname_r</B>()
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function is the reentrant equivalent of
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<B>ptsname</B>().
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It returns the name of the slave pseudoterminal device as a
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null-terminated string in the buffer pointed to by
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<I>buf</I>.
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The
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<I>buflen</I>
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argument specifies the number of bytes available in
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<I>buf</I>.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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On success,
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<B>ptsname</B>()
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returns a pointer to a string in static storage which will be
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overwritten by subsequent calls.
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This pointer must not be freed.
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On failure, NULL is returned.
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<P>
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On success,
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<B>ptsname_r</B>()
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returns 0.
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On failure, a nonzero value is returned
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and
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<I>errno</I>
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is set to indicate the error.
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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>EINVAL</B>
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<DD>
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(<B>ptsname_r</B>()
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only)
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<I>buf</I>
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is NULL.
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(This error is returned only for
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glibc 2.25 and earlier.)
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<DT id="3"><B>ENOTTY</B>
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<DD>
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<I>fd</I>
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does not refer to a pseudoterminal master device.
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<DT id="4"><B>ERANGE</B>
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<DD>
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(<B>ptsname_r</B>()
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only)
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<I>buf</I>
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is too small.
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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>ptsname</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>ptsname</B>()
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</TD><TD>Thread safety</TD><TD>MT-Unsafe race:ptsname<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>ptsname_r</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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<B>ptsname</B>():
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<BR> POSIX.1-2001, POSIX.1-2008.
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<P>
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<B>ptsname</B>()
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is part of the UNIX 98 pseudoterminal support (see
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<B><A HREF="/cgi-bin/man/man2html?4+pts">pts</A></B>(4)).
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<P>
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<B>ptsname_r</B>()
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is a Linux extension, that is proposed for inclusion
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in the next major revision of POSIX.1 (Issue 8).
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A version of this function is documented on Tru64 and HP-UX, but
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on those implementations, -1 is returned on error, with
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<I>errno</I>
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set to indicate the error.
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Avoid using this function in portable programs.
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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+ttyname">ttyname</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+unlockpt">unlockpt</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="5"><A HREF="#lbAB">NAME</A><DD>
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<DT id="6"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="7"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="8"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="9"><A HREF="#lbAF">ERRORS</A><DD>
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<DT id="10"><A HREF="#lbAG">VERSIONS</A><DD>
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<DT id="11"><A HREF="#lbAH">ATTRIBUTES</A><DD>
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<DT id="12"><A HREF="#lbAI">CONFORMING TO</A><DD>
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<DT id="13"><A HREF="#lbAJ">SEE ALSO</A><DD>
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<DT id="14"><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: 00:05:53 GMT, March 31, 2021
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</BODY>
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</HTML>
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