root/maint/gnulib/tests/test-posix_spawn_file_actions_addclose.c

/* */

DEFINITIONS

1. big_fd
2. main

   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 }

/* */