1 /* $NetBSD: h_fpufork.c,v 1.1 2020/02/11 03:15:10 riastradh Exp $ */
2
3 /*-
4 * Copyright (c) 2020 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __RCSID("$NetBSD: h_fpufork.c,v 1.1 2020/02/11 03:15:10 riastradh Exp $");
31
32 #include <sys/wait.h>
33
34 #include <err.h>
35 #include <sched.h>
36 #include <stdio.h>
37 #include <unistd.h>
38
39 int
main(void)40 main(void)
41 {
42 pid_t child, pid;
43 volatile double x = 1;
44 register double y = 2*x;
45 int status;
46
47 pid = fork();
48 switch (pid) {
49 case -1: /* error */
50 err(1, "fork");
51 case 0: /* child */
52 _exit(y == 2 ? 0 : 1);
53 default: /* parent */
54 break;
55 }
56
57 if ((child = wait(&status)) == -1)
58 err(1, "wait");
59 if (WIFSIGNALED(status))
60 errx(1, "child exited on signal %d", WTERMSIG(status));
61 if (!WIFEXITED(status))
62 errx(1, "child didn't exit");
63 return WEXITSTATUS(status);
64 }
65