182 lines
4.4 KiB
HTML
182 lines
4.4 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 TTYNAME</TITLE>
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</HEAD><BODY>
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<H1>TTYNAME</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2019-10-10<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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ttyname, ttyname_r - return name of a terminal
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/unistd.h">unistd.h</A>></B>
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<B>char *ttyname(int </B><I>fd</I><B>);</B>
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<B>int ttyname_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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</PRE>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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The function
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<B>ttyname</B>()
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returns a pointer to the null-terminated pathname of the terminal device
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that is open on the file descriptor <I>fd</I>, or NULL on error
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(for example, if <I>fd</I> is not connected to a terminal).
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The return value may point to static data, possibly overwritten by the
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next call.
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The function
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<B>ttyname_r</B>()
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stores this pathname in the buffer
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<I>buf</I>
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of length
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<I>buflen</I>.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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The function
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<B>ttyname</B>()
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returns a pointer to a pathname on success.
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On error, NULL is returned, and
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<I>errno</I>
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is set appropriately.
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The function
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<B>ttyname_r</B>()
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returns 0 on success, and an error number upon 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="1"><B>EBADF</B>
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<DD>
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Bad file descriptor.
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<DT id="2">
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<DD>
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<B>ENODEV</B>
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File descriptor refers to a slave pseudoterminal device
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but the corresponding pathname could not be found (see NOTES).
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<DT id="3"><B>ENOTTY</B>
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<DD>
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File descriptor does not refer to a terminal device.
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<DT id="4"><B>ERANGE</B>
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<DD>
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(<B>ttyname_r</B>())
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<I>buflen</I>
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was too small to allow storing the pathname.
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</DL>
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<A NAME="lbAG"> </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>ttyname</B>()
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</TD><TD>Thread safety</TD><TD>MT-Unsafe race:ttyname<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>ttyname_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="lbAH"> </A>
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<H2>CONFORMING TO</H2>
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POSIX.1-2001, POSIX.1-2008, 4.2BSD.
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<A NAME="lbAI"> </A>
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<H2>NOTES</H2>
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A process that keeps a file descriptor that refers to a
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<B><A HREF="/cgi-bin/man/man2html?4+pts">pts</A></B>(4)
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device open when switching to another mount namespace that uses a different
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<I>/dev/ptmx</I>
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instance may still accidentally find that a device path of the same name
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for that file descriptor exists.
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However, this device path refers to a different device and thus
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can't be used to access the device that the file descriptor refers to.
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Calling
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<B>ttyname</B>()
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or
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<B>ttyname_r</B>()
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on the file descriptor in the new mount namespace will cause these
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functions to return NULL and set
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<I>errno</I>
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to
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<B>ENODEV</B>.
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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?1+tty">tty</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?2+fstat">fstat</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?3+ctermid">ctermid</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+isatty">isatty</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?4+pts">pts</A></B>(4)
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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">ATTRIBUTES</A><DD>
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<DT id="11"><A HREF="#lbAH">CONFORMING TO</A><DD>
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<DT id="12"><A HREF="#lbAI">NOTES</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: 00:05:58 GMT, March 31, 2021
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</BODY>
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</HTML>
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