1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 * $FreeBSD: head/lib/libc/gen/dup3.c 326193 2017-11-25 17:12:48Z pfg $
31 */
32
33 #include "namespace.h"
34 #include <unistd.h>
35 #include <fcntl.h>
36 #include <errno.h>
37 #include "un-namespace.h"
38
39 int __dup3(int, int, int);
40
41 int
__dup3(int oldfd,int newfd,int flags)42 __dup3(int oldfd, int newfd, int flags)
43 {
44 int how;
45
46 if (oldfd == newfd) {
47 errno = EINVAL;
48 return (-1);
49 }
50
51 if (flags & ~O_CLOEXEC) {
52 errno = EINVAL;
53 return (-1);
54 }
55
56 how = (flags & O_CLOEXEC) ? F_DUP2FD_CLOEXEC : F_DUP2FD;
57
58 return (_fcntl(oldfd, how, newfd));
59 }
60
61 __weak_reference(__dup3, dup3);
62 __weak_reference(__dup3, _dup3);
63