1 /* Copyright (C) 2000 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 `open' for the given file during the `spawn' call. */
26 int
posix_spawn_file_actions_addopen(posix_spawn_file_actions_t * file_actions,int fd,const char * path,int oflag,mode_t mode)27 posix_spawn_file_actions_addopen(posix_spawn_file_actions_t *file_actions,
28 int fd, const char *path, int oflag,
29 mode_t mode)
30 {
31 int maxfd = sysconf(_SC_OPEN_MAX);
32 struct __spawn_action *rec;
33
34 /* Test for the validity of the file descriptor. */
35 if (fd < 0 || fd >= maxfd)
36 return EBADF;
37
38 /* Allocate more memory if needed. */
39 if (file_actions->__used == file_actions->__allocated
40 && __posix_spawn_file_actions_realloc (file_actions) != 0)
41 /* This can only mean we ran out of memory. */
42 return ENOMEM;
43
44 /* Add the new value. */
45 rec = &file_actions->__actions[file_actions->__used];
46 rec->tag = spawn_do_open;
47 rec->action.open_action.fd = fd;
48 rec->action.open_action.path = path;
49 rec->action.open_action.oflag = oflag;
50 rec->action.open_action.mode = mode;
51
52 /* Account for the new entry. */
53 ++file_actions->__used;
54 return 0;
55 }
56