1/* Copyright (C) 2000, 2009-2012 Free Software Foundation, Inc.
2   This file is part of the GNU C Library.
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 <http://www.gnu.org/licenses/>.  */
16
17#include <config.h>
18
19/* Specification.  */
20#include <spawn.h>
21
22#include <errno.h>
23#include <unistd.h>
24
25#if !_LIBC
26# define __sysconf(open_max) getdtablesize ()
27#endif
28
29#if !HAVE_WORKING_POSIX_SPAWN
30# include "spawn_int.h"
31#endif
32
33/* Add an action to FILE-ACTIONS which tells the implementation to call
34   'close' for the given file descriptor during the 'spawn' call.  */
35int
36posix_spawn_file_actions_addclose (posix_spawn_file_actions_t *file_actions,
37                                   int fd)
38#undef posix_spawn_file_actions_addclose
39{
40  int maxfd = __sysconf (_SC_OPEN_MAX);
41
42  /* Test for the validity of the file descriptor.  */
43  if (fd < 0 || fd >= maxfd)
44    return EBADF;
45
46#if HAVE_WORKING_POSIX_SPAWN
47  return posix_spawn_file_actions_addclose (file_actions, fd);
48#else
49  /* Allocate more memory if needed.  */
50  if (file_actions->_used == file_actions->_allocated
51      && __posix_spawn_file_actions_realloc (file_actions) != 0)
52    /* This can only mean we ran out of memory.  */
53    return ENOMEM;
54
55  {
56    struct __spawn_action *rec;
57
58    /* Add the new value.  */
59    rec = &file_actions->_actions[file_actions->_used];
60    rec->tag = spawn_do_close;
61    rec->action.open_action.fd = fd;
62
63    /* Account for the new entry.  */
64    ++file_actions->_used;
65
66    return 0;
67  }
68#endif
69}
70