tests/test-posix_spawn_file_actions_adddup2.c

   1 /* Test posix_spawn_file_actions_adddup2() function.
   2    Copyright (C) 2011-2020 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 <spawn.h>
  20
  21 #include "signature.h"
  22 SIGNATURE_CHECK (posix_spawn_file_actions_adddup2, int,
  23                  (posix_spawn_file_actions_t *, int, int));
  24
  25 #include <errno.h>
  26 #include <limits.h>
  27 #include <unistd.h>
  28
  29 #include "macros.h"
  30
  31 /* Return a file descriptor that is too big to use.
  32    Prefer the smallest such fd, except use OPEN_MAX if it is defined
  33    and is greater than getdtablesize (), as that's how OS X works.  */
  34 static int
  35 big_fd (void)
  36 {
  37   int fd = getdtablesize ();
  38 #ifdef OPEN_MAX
  39   if (fd < OPEN_MAX)
  40     fd = OPEN_MAX;
  41 #endif
  42   return fd;
  43 }
  44
  45 int
  46 main (void)
  47 {
  48   int bad_fd = big_fd ();
  49   posix_spawn_file_actions_t actions;
  50
  51   ASSERT (posix_spawn_file_actions_init (&actions) == 0);
  52
  53   /* Test behaviour for invalid file descriptors.  */
  54   {
  55     errno = 0;
  56     ASSERT (posix_spawn_file_actions_adddup2 (&actions, -1, 2) == EBADF);
  57   }
  58   {
  59     errno = 0;
  60     ASSERT (posix_spawn_file_actions_adddup2 (&actions, bad_fd, 2) == EBADF);
  61   }
  62   {
  63     errno = 0;
  64     ASSERT (posix_spawn_file_actions_adddup2 (&actions, 2, -1) == EBADF);
  65   }
  66   {
  67     errno = 0;
  68     ASSERT (posix_spawn_file_actions_adddup2 (&actions, 2, bad_fd) == EBADF);
  69   }
  70
  71   posix_spawn_file_actions_destroy (&actions);
  72
  73   return 0;
  74 }