redhat man page for ctermid

CTERMID(3)						     Linux Programmer's Manual							CTERMID(3)

NAME
       ctermid - get controlling terminal name

SYNOPSIS
       #include <stdio.h>

       char *ctermid(char *s);

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  charac-
       ters in the returned pathname.

RETURN VALUE
       The pointer to the pathname.

CONFORMING TO
       POSIX.1

BUGS
       The path returned 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
								    1993-04-06								CTERMID(3)