ctermid(3) Library Functions Manual ctermid(3)
NAME
ctermid - get controlling terminal name
LIBRARY
Standard C library (libc, -lc)
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 │
└────────────────────────────────────────────┴───────────────┴─────────┘
STANDARDS
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.
SEE ALSO
ttyname(3)
Linux man-pages 6.03 2022-12-15 ctermid(3)
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