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 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