stdio-common/tst-fileno.c

   1 /* Copyright (C) 1994 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <stdio.h>
  21 #include <unistd.h>
  22
  23 static int
  24 DEFUN(check, (name, stream, fd), CONST char *name AND FILE *stream AND int fd)
  25 {
  26   int sfd = fileno (stream);
  27   printf ("(fileno (%s) = %d) %c= %d\n", name, sfd, sfd == fd ? '=' : '!', fd);
  28   return sfd != fd;
  29 }
  30
  31 int
  32 DEFUN_VOID(main)
  33 {
  34   exit (check ("stdin", stdin, STDIN_FILENO) ||
  35         check ("stdout", stdout, STDOUT_FILENO) ||
  36         check ("stderr", stderr, STDERR_FILENO));
  37 }