CTERMID(3) BSD Library Functions Manual CTERMID(3)
NAME
ctermid, ctermid_r -- generate terminal pathname
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdio.h>
char *
ctermid(char *s);
char *
ctermid_r(char *s);
DESCRIPTION
The ctermid() function generates a string that, when used as a pathname, refers to the current controlling terminal of the calling process.
If s is the NULL pointer, a pointer to a static area is returned. Otherwise, the pathname is copied into the memory referenced by s. The
argument s is assumed to be at least L_ctermid (as defined in the include file <stdio.h>) bytes long.
The ctermid_r() function provides the same functionality as ctermid(), except that if s is a NULL pointer, NULL is returned.
The current implementation simply returns '/dev/tty'.
RETURN VALUES
Upon successful completion, a non-NULL pointer is returned. Otherwise, a NULL pointer is returned and the global variable errno is set to
indicate the error.
ERRORS
The current implementation detects no error conditions.
SEE ALSO
ttyname(3)
STANDARDS
The ctermid() function conforms to IEEE Std 1003.1-1988 (``POSIX.1'').
BUGS
By default the ctermid() function writes all information to an internal static object. Subsequent calls to ctermid() will modify the same
object.
BSD
June 4, 1993 BSD
