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glibc  2.9
tst-fileno.c
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00001 /* Copyright (C) 1994, 1997, 2000 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <stdio.h>
00020 #include <stdlib.h>
00021 #include <unistd.h>
00022 
00023 static int
00024 check (const char *name, FILE *stream, int fd)
00025 {
00026   int sfd = fileno (stream);
00027   printf ("(fileno (%s) = %d) %c= %d\n", name, sfd,
00028          sfd == fd ? '=' : '!', fd);
00029   return sfd != fd;
00030 }
00031 
00032 int
00033 main (void)
00034 {
00035   return (check ("stdin", stdin, STDIN_FILENO) ||
00036          check ("stdout", stdout, STDOUT_FILENO) ||
00037          check ("stderr", stderr, STDERR_FILENO));
00038 }