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b168057a | 1 | /* Copyright (C) 2000-2015 Free Software Foundation, Inc. |
a5a6f926 UD |
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 | |
41bdb6e2 AJ |
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. | |
a5a6f926 UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
a5a6f926 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
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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 | `dup2' for the given file descriptors during the `spawn' call. */ | |
26 | int | |
27 | posix_spawn_file_actions_adddup2 (posix_spawn_file_actions_t *file_actions, | |
28 | int fd, int newfd) | |
29 | { | |
4aebaa6b | 30 | int maxfd = __sysconf (_SC_OPEN_MAX); |
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31 | struct __spawn_action *rec; |
32 | ||
33 | /* Test for the validity of the file descriptor. */ | |
34 | if (fd < 0 || newfd < 0 || fd >= maxfd || newfd >= maxfd) | |
35 | return EBADF; | |
36 | ||
d77cd295 | 37 | /* Allocate more memory if needed. */ |
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38 | if (file_actions->__used == file_actions->__allocated |
39 | && __posix_spawn_file_actions_realloc (file_actions) != 0) | |
d77cd295 | 40 | /* This can only mean we ran out of memory. */ |
a5a6f926 UD |
41 | return ENOMEM; |
42 | ||
43 | /* Add the new value. */ | |
08c7f6b0 | 44 | rec = &file_actions->__actions[file_actions->__used]; |
a5a6f926 UD |
45 | rec->tag = spawn_do_dup2; |
46 | rec->action.dup2_action.fd = fd; | |
47 | rec->action.dup2_action.newfd = newfd; | |
48 | ||
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49 | /* Account for the new entry. */ |
50 | ++file_actions->__used; | |
51 | ||
a5a6f926 UD |
52 | return 0; |
53 | } |