1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /* Copyright 2013, OmniTI Computer Consulting, Inc. All rights reserved. */
23
24 /*
25 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
26 * Use is subject to license terms.
27 * Copyright 2024 Oxide Computer Company
28 */
29
30 /* Copyright (c) 1988 AT&T */
31 /* All Rights Reserved */
32
33 #include "lint.h"
34 #include <sys/types.h>
35 #include <fcntl.h>
36 #include <errno.h>
37
38 #pragma weak _dup = dup
39 int
dup(int fildes)40 dup(int fildes)
41 {
42 return (fcntl(fildes, F_DUPFD, 0));
43 }
44
45 #pragma weak _dup2 = dup2
46 int
dup2(int fildes,int fildes2)47 dup2(int fildes, int fildes2)
48 {
49 return (fcntl(fildes, F_DUP2FD, fildes2));
50 }
51
52 int
dup3(int fildes,int fildes2,int flags)53 dup3(int fildes, int fildes2, int flags)
54 {
55 int dflags = 0;
56
57 /*
58 * dup3() only supports O_ open flags that translate into file
59 * descriptor flags in the F_GETFD sense.
60 */
61 if (flags & ~(O_CLOEXEC | O_CLOFORK)) {
62 errno = EINVAL;
63 return (-1);
64 }
65
66 /*
67 * This call differs from dup2 such that it is an error when
68 * fildes == fildes2
69 */
70 if (fildes == fildes2) {
71 errno = EINVAL;
72 return (-1);
73 }
74
75 if ((flags & O_CLOEXEC) != 0)
76 dflags |= FD_CLOEXEC;
77 if ((flags & O_CLOFORK) != 0)
78 dflags |= FD_CLOFORK;
79
80 return (fcntl(fildes, F_DUP3FD, fildes2, dflags));
81 }
82