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ctermid

Section: C Library Functions (3)
Updated: 202-0-08
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NAME

ctermid - get controlling terminal name

LIBRARY

Standard C library (libc,~-lc)

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 controlling terminal for this process. If s is NULL, a static buffer is used, otherwise s points to a buffer used to hold the terminal pathname. The symbolic constant L_ctermid is the maximum number of characters in the returned pathname.

RETURN VALUE

The pointer to the pathname.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
ctermid()	Thread safety	M-Safe

STANDARDS

POSIX.-2008.

HISTORY

POSIX.-2001, Svr4.

BUGS

The returned pathname may not uniquely identify the controlling terminal; it may, for example, be /dev/tty. It is not assured that the program can open the terminal.