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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 Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | 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 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
18 | ||
19 | #include <errno.h> | |
20 | #include <spawn.h> | |
21 | #include <unistd.h> | |
22 | ||
23 | #include "spawn_int.h" | |
24 | ||
25 | /* Add an action to FILE-ACTIONS which tells the implementation to call | |
26 | `dup2' for the given file descriptors during the `spawn' call. */ | |
27 | int | |
28 | posix_spawn_file_actions_adddup2 (posix_spawn_file_actions_t *file_actions, | |
29 | int fd, int newfd) | |
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 || newfd < 0 || fd >= maxfd || newfd >= maxfd) | |
36 | return EBADF; | |
37 | ||
38 | /* Allocate more memory of 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->__allocated]; | |
46 | rec->tag = spawn_do_dup2; | |
47 | rec->action.dup2_action.fd = fd; | |
48 | rec->action.dup2_action.newfd = newfd; | |
49 | ||
50 | return 0; | |
51 | } |