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 'dup2' for the given file descriptors during the 'spawn' call. */
35 int
posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t * file_actions,int fd,int newfd)36 posix_spawn_file_actions_adddup2 (posix_spawn_file_actions_t *file_actions,
37 int fd, int newfd)
38 #undef posix_spawn_file_actions_adddup2
39 {
40 int maxfd = __sysconf (_SC_OPEN_MAX);
41
42 /* Test for the validity of the file descriptor. */
43 if (fd < 0 || newfd < 0 || fd >= maxfd || newfd >= maxfd)
44 return EBADF;
45
46 #if HAVE_WORKING_POSIX_SPAWN
47 return posix_spawn_file_actions_adddup2 (file_actions, fd, newfd);
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_dup2;
61 rec->action.dup2_action.fd = fd;
62 rec->action.dup2_action.newfd = newfd;
63
64 /* Account for the new entry. */
65 ++file_actions->_used;
66
67 return 0;
68 }
69 #endif
70 }
71