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#include <stdlib.h>
22#include <string.h>
23
24#include "spawn_int.h"
25
26/* Add an action to FILE-ACTIONS which tells the implementation to call
27 `open' for the given file during the `spawn' call. */
28int
29posix_spawn_file_actions_addopen (posix_spawn_file_actions_t *file_actions,
30 int fd, const char *path, int oflag,
31 mode_t mode)
32{
33 int maxfd = __sysconf (_SC_OPEN_MAX);
34 struct __spawn_action *rec;
35
36 /* Test for the validity of the file descriptor. */
37 if (fd < 0 || fd >= maxfd)
38 return EBADF;
39
40 char *path_copy = strdup (path);
41 if (path_copy == NULL)
42 return ENOMEM;
43
44 /* Allocate more memory if needed. */
45 if (file_actions->__used == file_actions->__allocated
46 && __posix_spawn_file_actions_realloc (file_actions) != 0)
47 {
48 /* This can only mean we ran out of memory. */
49 free (path_copy);
50 return ENOMEM;
51 }
52
53 /* Add the new value. */
54 rec = &file_actions->__actions[file_actions->__used];
55 rec->tag = spawn_do_open;
56 rec->action.open_action.fd = fd;
57 rec->action.open_action.path = path_copy;
58 rec->action.open_action.oflag = oflag;
59 rec->action.open_action.mode = mode;
60
61 /* Account for the new entry. */
62 ++file_actions->__used;
63
64 return 0;
65}
66