ctermid (3)

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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 >= 1 || _XOPEN_SOURCE || _POSIX_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

Multithreading (see pthreads(7))

The ctermid() function is thread-safe with exceptions. It is not thread-safe if called with a NULL parameter.

CONFORMING TO

Svr4, POSIX.1-2001.

BUGS

The path returned 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.

SEE ALSO

ttyname(3)

COLOPHON

This page is part of release 3.54 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.

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