tests/test-posix_spawn_file_actions_addopen.c

   1 /* Test posix_spawn_file_actions_addopen() function.
   2    Copyright (C) 2011-2024 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 #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 test_exit_status;
  72 }