1 /* $OpenBSD: dup3.c,v 1.1.1.1 2018/04/10 23:00:53 bluhm Exp $ */
2 /*
3 * Copyright (c) 2018 Alexander Bluhm <bluhm@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #include <err.h>
19 #include <fcntl.h>
20 #include <unistd.h>
21
22 #include "header.h"
23
24 void
fdops(int fdpre,int fdpost)25 fdops(int fdpre, int fdpost)
26 {
27 if (dup3(fdpre, 5, O_CLOEXEC) == -1)
28 err(1, "dup3 pre");
29 if (dup3(fdpost, 6, O_CLOEXEC) == -1)
30 err(1, "dup3 post");
31 if (dup3(fdpre, 7, O_CLOEXEC) == -1)
32 err(1, "dup3 pepare post overwite");
33 if (dup3(fdpost, 7, O_CLOEXEC) == -1)
34 err(1, "dup3 post overwrite");
35 if (dup3(fdpost, 8, O_CLOEXEC) == -1)
36 err(1, "dup3 pepare pre overwrite");
37 if (dup3(fdpre, 8, O_CLOEXEC) == -1)
38 err(1, "dup3 pre overwite");
39 if (dup3(fdpre, 9, 0) == -1)
40 err(1, "dup3 pepare pre equal");
41 if (dup3(9, 9, O_CLOEXEC) != -1)
42 errx(1, "dup3 pre equal succeeded");
43 if (dup3(fdpost, 10, 0) == -1)
44 err(1, "dup3 pepare post equal");
45 if (dup3(10, 10, O_CLOEXEC) != -1)
46 errx(1, "dup3 post equal succeeded");
47 }
48