/* * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009 * The President and Fellows of Harvard College. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * triple.c * * Runs three copies of some subprogram. */ #include <stdio.h> #include <unistd.h> #include <err.h> #include <test/triple.h> static pid_t spawnv(const char *prog, char **argv) { pid_t pid = fork(); switch (pid) { case -1: err(1, "fork"); case 0: /* child */ execv(prog, argv); err(1, "%s: execv", prog); default: /* parent */ break; } return pid; } static int dowait(int index, int pid) { int status; if (waitpid(pid, &status, 0)<0) { warn("waitpid for copy #%d (pid %d)", index, pid); return 1; } else if (WIFSIGNALED(status)) { warnx("copy #%d (pid %d): signal %d", index, pid, WTERMSIG(status)); return 1; } else if (WEXITSTATUS(status) != 0) { warnx("copy #%d (pid %d): exit %d", index, pid, WEXITSTATUS(status)); return 1; } return 0; } void triple(const char *prog) { pid_t pids[3]; int i, failures = 0; char *args[2]; /* set up the argv */ args[0]=(char *)prog; args[1]=NULL; warnx("Starting: running three copies of %s...", prog); for (i=0; i<3; i++) { pids[i]=spawnv(args[0], args); } for (i=0; i<3; i++) { failures += dowait(i, pids[i]); } if (failures > 0) { warnx("%d failures", failures); } else { warnx("Congratulations! You passed."); } }