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-'\" t
-.\" Copyright (c) 1995 Jim Van Zandt <jrv@vanzandt.mv.com>
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.\" Modified 2001-12-13, Martin Schulze <joey@infodrom.org>
-.\" Added ttyname_r, aeb, 2002-07-20
-.\"
-.TH ttyname 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-ttyname, ttyname_r \- return name of a terminal
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.BI "char *ttyname(int " fd );
-.BI "int ttyname_r(int " fd ", char " buf [. buflen "], size_t " buflen );
-.fi
-.SH DESCRIPTION
-The function
-.BR ttyname ()
-returns a pointer to the null-terminated pathname of the terminal device
-that is open on the file descriptor \fIfd\fP, or NULL on error
-(for example, if \fIfd\fP is not connected to a terminal).
-The return value may point to static data, possibly overwritten by the
-next call.
-The function
-.BR ttyname_r ()
-stores this pathname in the buffer
-.I buf
-of length
-.IR buflen .
-.SH RETURN VALUE
-The function
-.BR ttyname ()
-returns a pointer to a pathname on success.
-On error, NULL is returned, and
-.I errno
-is set to indicate the error.
-The function
-.BR ttyname_r ()
-returns 0 on success, and an error number upon error.
-.SH ERRORS
-.TP
-.B EBADF
-Bad file descriptor.
-.TP
-.\" glibc commit 15e9a4f378c8607c2ae1aa465436af4321db0e23
-.B ENODEV
-.I fd
-refers to a slave pseudoterminal device
-but the corresponding pathname could not be found (see NOTES).
-.TP
-.B ENOTTY
-.I fd
-does not refer to a terminal device.
-.TP
-.B ERANGE
-.RB ( ttyname_r ())
-.I buflen
-was too small to allow storing the pathname.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR ttyname ()
-T} Thread safety MT-Unsafe race:ttyname
-T{
-.na
-.nh
-.BR ttyname_r ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, 4.2BSD.
-.SH NOTES
-A process that keeps a file descriptor that refers to a
-.BR pts (4)
-device open when switching to another mount namespace that uses a different
-.I /dev/ptmx
-instance may still accidentally find that a device path of the same name
-for that file descriptor exists.
-However, this device path refers to a different device and thus
-can't be used to access the device that the file descriptor refers to.
-Calling
-.BR ttyname ()
-or
-.BR ttyname_r ()
-on the file descriptor in the new mount namespace will cause these
-functions to return NULL and set
-.I errno
-to
-.BR ENODEV .
-.SH SEE ALSO
-.BR tty (1),
-.BR fstat (2),
-.BR ctermid (3),
-.BR isatty (3),
-.BR pts (4)