1  /* Test posix_spawn_file_actions_adddup2() 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_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  }