1/* Copyright (C) 2000-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library 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 GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <spawn.h>
20#include <unistd.h>
21
22#include "spawn_int.h"
23
24/* Add an action to FILE-ACTIONS which tells the implementation to call
25 `close' for the given file descriptor during the `spawn' call. */
26int
27posix_spawn_file_actions_addclose (posix_spawn_file_actions_t *file_actions,
28 int fd)
29{
30 int maxfd = __sysconf (_SC_OPEN_MAX);
31 struct __spawn_action *rec;
32
33 /* Test for the validity of the file descriptor. */
34 if (fd < 0 || fd >= maxfd)
35 return EBADF;
36
37 /* Allocate more memory if needed. */
38 if (file_actions->__used == file_actions->__allocated
39 && __posix_spawn_file_actions_realloc (file_actions) != 0)
40 /* This can only mean we ran out of memory. */
41 return ENOMEM;
42
43 /* Add the new value. */
44 rec = &file_actions->__actions[file_actions->__used];
45 rec->tag = spawn_do_close;
46 rec->action.open_action.fd = fd;
47
48 /* Account for the new entry. */
49 ++file_actions->__used;
50
51 return 0;
52}
53