tests/test-fdopen.c

   1 /* Test opening a stream with a file descriptor.
   2    Copyright (C) 2011-2021 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 #include <stdio.h>
  20
  21 #include "signature.h"
  22 SIGNATURE_CHECK (fdopen, FILE *, (int, const char *));
  23
  24 #include <errno.h>
  25 #include <unistd.h>
  26
  27 #include "macros.h"
  28
  29 int
  30 main (void)
  31 {
  32   /* Test behavior on failure.  POSIX makes it hard to check for
  33      failure, since the behavior is not well-defined on invalid file
  34      descriptors, so try fdopen 1000 times and if that's not enough to
  35      fail due to EMFILE, so be it.  */
  36
  37   int i;
  38   for (i = 0; i < 1000; i++)
  39     {
  40       errno = 0;
  41       if (! fdopen (STDOUT_FILENO, "w"))
  42         {
  43           ASSERT (errno != 0);
  44           break;
  45         }
  46     }
  47
  48   return 0;
  49 }