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 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 │
└────────────────────────────────────────────┴───────────────┴─────────┘
STANDARDS
POSIX.1-2008.
HISTORY
POSIX.1-2001, 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 6.9.1 2024-05-02 ctermid(3)
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