tests/test-dirfd.c

   1 /* Test of dirfd() function.
   2    Copyright (C) 2023-2024 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 /* Written by Bruno Haible <bruno@clisp.org>, 2023.  */
  18
  19 #include <config.h>
  20
  21 #include <dirent.h>
  22
  23 #include <stdio.h>
  24
  25 #include "macros.h"
  26
  27 int
  28 main ()
  29 {
  30 #if defined _WIN32 && !defined __CYGWIN__
  31   fprintf (stderr, "Skipping test: The DIR type does not contain a file descriptor.\n");
  32   return 77;
  33 #else
  34   /* On all other platforms, we expect to have either
  35        - a dirfd() function, or
  36        - a dirfd macro, or
  37        - a DIR struct with a d_fd member, or
  38        - a DIR struct with a dd_fd member.
  39      If we don't have this, dirfd.c produces a function that always returns -1.
  40      Check here that this does not happen.  */
  41   DIR *d = opendir (".");
  42   int fd = dirfd (d);
  43   ASSERT (fd >= 0);
  44
  45   return test_exit_status;
  46 #endif
  47 }