CTERMID(3) Linux Programmer's Manual CTERMID(3)

ctermid - get controlling terminal name

#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

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.

The pointer to the pathname.

see_pthreads(7))">)">Multithreading (see pthreads(7))

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

Svr4, POSIX.1-2001.

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.

ttyname(3)

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2013-07-04 GNU

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