ctermid - get controlling terminal name
Standard C library (libc, -lc)
#include <stdio.h>
char *ctermid(char *s);Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
ctermid():
_POSIX_C_SOURCEctermid() 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.
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
ctermid() |
Thread safety | MT-Safe |
POSIX.1-2008.
POSIX.1-2001, Svr4.
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.
ttyname(3)