1 /* Copyright (C) 2000 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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. */
23 #include "spawn_int.h"
25 /* Add an action to FILE-ACTIONS which tells the implementation to call
26 `dup2' for the given file descriptors during the `spawn' call. */
28 posix_spawn_file_actions_adddup2 (posix_spawn_file_actions_t
*file_actions
,
31 int maxfd
= sysconf (_SC_OPEN_MAX
);
32 struct __spawn_action
*rec
;
34 /* Test for the validity of the file descriptor. */
35 if (fd
< 0 || newfd
< 0 || fd
>= maxfd
|| newfd
>= maxfd
)
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. */
44 /* Add the new value. */
45 rec
= &file_actions
->__actions
[file_actions
->__used
];
46 rec
->tag
= spawn_do_dup2
;
47 rec
->action
.dup2_action
.fd
= fd
;
48 rec
->action
.dup2_action
.newfd
= newfd
;
50 /* Account for the new entry. */
51 ++file_actions
->__used
;