1/* Copyright (C) 2000-2023 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 <https://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 `dup2' for the given file descriptors during the `spawn' call. */
26int
27__posix_spawn_file_actions_adddup2 (posix_spawn_file_actions_t *file_actions,
28 int fd, int newfd)
29{
30 struct __spawn_action *rec;
31
32 if (!__spawn_valid_fd (fd) || !__spawn_valid_fd (newfd))
33 return EBADF;
34
35 /* Allocate more memory if needed. */
36 if (file_actions->__used == file_actions->__allocated
37 && __posix_spawn_file_actions_realloc (file_actions) != 0)
38 /* This can only mean we ran out of memory. */
39 return ENOMEM;
40
41 /* Add the new value. */
42 rec = &file_actions->__actions[file_actions->__used];
43 rec->tag = spawn_do_dup2;
44 rec->action.dup2_action.fd = fd;
45 rec->action.dup2_action.newfd = newfd;
46
47 /* Account for the new entry. */
48 ++file_actions->__used;
49
50 return 0;
51}
52weak_alias (__posix_spawn_file_actions_adddup2,
53 posix_spawn_file_actions_adddup2)
54