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
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.
For an explanation of the terms used in this section, see
attributes(7).
Interface |
Attribute |
Value |
ctermid () |
Thread safety |
MT-Safe |
POSIX.1-2001, POSIX.1-2008, 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)