1 /* $NetBSD: compat_dup3.c,v 1.2 2024/05/20 01:33:40 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2024 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31 #include <sys/cdefs.h>
32 #if defined(LIBC_SCCS) && !defined(lint)
33 __RCSID("$NetBSD: compat_dup3.c,v 1.2 2024/05/20 01:33:40 christos Exp $");
34 #endif /* LIBC_SCCS and not lint */
35
36 #include "namespace.h"
37 #define __LIBC12_SOURCE__
38 #include <fcntl.h>
39 #include <compat/include/unistd.h>
40
41 __warn_references(dup3,
42 "warning: reference to compatibility dup3(); include <unistd.h> to generate correct reference")
43
44 int
dup3(int oldfd,int newfd,int flags)45 dup3(int oldfd, int newfd, int flags)
46 {
47 if (oldfd != newfd) {
48 return __dup3100(oldfd, newfd, flags);
49 }
50 if (flags & (O_NONBLOCK|O_NOSIGPIPE)) {
51 int e = fcntl(newfd, F_GETFL, 0);
52 if (e == -1)
53 return -1;
54 e |= flags & (O_NONBLOCK|O_NOSIGPIPE);
55 e = fcntl(newfd, F_SETFL, e);
56 if (e == -1)
57 return -1;
58 }
59 if (flags & O_CLOEXEC)
60 return fcntl(newfd, F_SETFD, FD_CLOEXEC);
61 return 0;
62 }
63