1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2012 Jukka A. Ukkonen
5 * All rights reserved.
6 *
7 * This software was developed by Jukka Ukkonen for FreeBSD.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include "namespace.h"
32 #include <unistd.h>
33 #include <fcntl.h>
34 #include <errno.h>
35 #include "un-namespace.h"
36
37 int __dup3(int, int, int);
38
39 int
__dup3(int oldfd,int newfd,int flags)40 __dup3(int oldfd, int newfd, int flags)
41 {
42 int fdflags;
43
44 if (oldfd == newfd) {
45 errno = EINVAL;
46 return (-1);
47 }
48
49 if ((flags & ~(O_CLOEXEC | O_CLOFORK)) != 0) {
50 errno = EINVAL;
51 return (-1);
52 }
53
54 fdflags = ((flags & O_CLOEXEC) != 0 ? FD_CLOEXEC : 0) |
55 ((flags & O_CLOFORK) != 0 ? FD_CLOFORK : 0);
56
57 return (_fcntl(oldfd, F_DUP3FD | (fdflags << F_DUP3FD_SHIFT), newfd));
58 }
59
60 __weak_reference(__dup3, dup3);
61 __weak_reference(__dup3, _dup3);
62