1  /* Test posix_spawn_file_actions_addclose() function.
       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 <spawn.h>
      20  
      21  #include "signature.h"
      22  SIGNATURE_CHECK (posix_spawn_file_actions_addclose, int,
      23                   (posix_spawn_file_actions_t *, 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    posix_spawn_file_actions_t actions;
      49  
      50    ASSERT (posix_spawn_file_actions_init (&actions) == 0);
      51  
      52    /* Test behaviour for invalid file descriptors.  */
      53    {
      54      errno = 0;
      55      ASSERT (posix_spawn_file_actions_addclose (&actions, -1) == EBADF);
      56    }
      57    /* This behaviour is not mandated by POSIX, but happens to pass on all
      58       platforms.  */
      59    {
      60      int bad_fd = big_fd ();
      61      errno = 0;
      62      ASSERT (posix_spawn_file_actions_addclose (&actions, bad_fd) == EBADF);
      63    }
      64  
      65    posix_spawn_file_actions_destroy (&actions);
      66  
      67    return 0;
      68  }