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CTERMID(3) Linux Programmer's Manual CTERMID(3)
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
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
For an explanation of the terms used in this section, see attributes(7).
┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
│ctermid() │ Thread safety │ MT-Safe │
└──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, Svr4.
BUGS
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.
SEE ALSO
ttyname(3)
GNU 2021-03-22 CTERMID(3)