CTERMID(3) manual page
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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.
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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