dwww: tpablo.net

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 con-
trolling terminal for this process. If s is NULL, a static buffer is
used, otherwise s points to a buffer used to hold the terminal path-
name. The symbolic constant L_ctermid is the maximum number of charac-
ters in the returned pathname.

RETURN VALUE
The pointer to the pathname.

ATTRIBUTES
For an explanation of the terms used in this section, see at-
tributes(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 termi-
nal; it may, for example, be /dev/tty.

It is not assured that the program can open the terminal.