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