sysdeps/posix/ctermid.c

   1 /* Copyright (C) 1991, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <stdio.h>
  20 #include <string.h>
  21
  22
  23 /* Return the name of the controlling terminal.
  24    If S is not NULL, the name is copied into it (it should be at
  25    least L_ctermid bytes long), otherwise a static buffer is used.  */
  26 char *
  27 ctermid (s)
  28      char *s;
  29 {
  30   static char name[L_ctermid];
  31
  32   if (s == NULL)
  33     s = name;
  34
  35   return strcpy (s, "/dev/tty");
  36 }