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      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