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+'\" t
+.\" Copyright (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.\" Modified Sat Jul 24 19:51:06 1993 by Rik Faith (faith@cs.unc.edu)
+.TH ctermid 3 2023-07-20 "Linux man-pages 6.05.01"
+.SH NAME
+ctermid \- get controlling terminal name
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <stdio.h>
+.\" POSIX also requires this function to be declared in <unistd.h>,
+.\" and glibc does so if suitable feature test macros are defined.
+.PP
+.BI "char *ctermid(char *" "s" );
+.fi
+.PP
+.RS -4
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.RE
+.PP
+.BR ctermid ():
+.nf
+    _POSIX_C_SOURCE
+.fi
+.SH DESCRIPTION
+.BR ctermid ()
+returns a string which is the pathname for the current
+controlling terminal for this process.
+If
+.I s
+is NULL,
+a static buffer is used, otherwise
+.I s
+points to a buffer used to hold the terminal pathname.
+The symbolic constant
+.B L_ctermid
+is the maximum number of characters in the returned pathname.
+.SH RETURN VALUE
+The pointer to 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 ctermid ()
+T}	Thread safety	MT-Safe
+.TE
+.sp 1
+.SH STANDARDS
+POSIX.1-2008.
+.SH HISTORY
+POSIX.1-2001, Svr4.
+.SH BUGS
+The returned pathname may not uniquely identify the controlling
+terminal; it may, for example, be
+.IR /dev/tty .
+.PP
+It is not assured that the program can open the terminal.
+.\" in glibc 2.3.x, x >= 4, the glibc headers threw an error
+.\" if ctermid() was given an argument; fixed in glibc 2.4.
+.SH SEE ALSO
+.BR ttyname (3)