1 /*
2 * SPDX-License-Identifier: ISC
3 *
4 * Copyright (c) 2013 Todd C. Miller <Todd.Miller@sudo.ws>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 /*
20 * This is an open source non-commercial project. Dear PVS-Studio, please check it.
21 * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
22 */
23
24 #include <config.h>
25
26 #ifndef HAVE_DUP3
27
28 #include <errno.h>
29 #include <fcntl.h>
30 #include <unistd.h>
31
32 #include "sudo_compat.h"
33
34 int
sudo_dup3(int oldd,int newd,int flags)35 sudo_dup3(int oldd, int newd, int flags)
36 {
37 int oflags;
38
39 if (oldd == newd) {
40 errno = EINVAL;
41 return -1;
42 }
43
44 if (dup2(oldd, newd) == -1)
45 return -1;
46
47 oflags = fcntl(newd, F_GETFL, 0);
48 if (oflags == -1)
49 goto bad;
50
51 if (ISSET(flags, O_NONBLOCK)) {
52 if (!ISSET(oflags, O_NONBLOCK)) {
53 SET(oflags, O_NONBLOCK);
54 if (fcntl(newd, F_SETFL, oflags) == -1)
55 goto bad;
56 }
57 } else {
58 if (ISSET(oflags, O_NONBLOCK)) {
59 CLR(oflags, O_NONBLOCK);
60 if (fcntl(newd, F_SETFL, oflags) == -1)
61 goto bad;
62 }
63 }
64 if (ISSET(flags, O_CLOEXEC)) {
65 if (fcntl(newd, F_SETFD, FD_CLOEXEC) == -1)
66 goto bad;
67 }
68 return 0;
69 bad:
70 close(newd);
71 return -1;
72 }
73
74 #endif /* HAVE_DUP3 */
75