CTERMID(3) Linux Programmer's Manual CTERMID(3)
NAME
ctermid - get controlling terminal name
SYNOPSIS
#include <stdio.h>
char *ctermid(char *s);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
ctermid(): _POSIX_C_SOURCE
DESCRIPTION
ctermid() returns a string which is the pathname for the current con-
trolling terminal for this process. If s is NULL, a static buffer is
used, otherwise s points to a buffer used to hold the terminal path-
name. The symbolic constant L_ctermid is the maximum number of charac-
ters in the returned pathname.
RETURN VALUE
The pointer to the pathname.
ATTRIBUTES
For an explanation of the terms used in this section, see at-
tributes(7).
+----------+---------------+---------+
|Interface | Attribute | Value |
+----------+---------------+---------+
|ctermid() | Thread safety | MT-Safe |
+----------+---------------+---------+
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, Svr4.
BUGS
The returned pathname may not uniquely identify the controlling termi-
nal; it may, for example, be /dev/tty.
It is not assured that the program can open the terminal.
SEE ALSO
ttyname(3)
COLOPHON
This page is part of release 5.07 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
GNU 2019-03-06 CTERMID(3)