/* $OpenBSD: system.c,v 1.8 2005/08/08 08:05:37 espie Exp $ */ /* * Copyright (c) 1988 The Regents of the University of California. * All rights reserved. * * 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 REGENTS 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 REGENTS 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. */ #include <sys/types.h> #include <sys/wait.h> #include <signal.h> #include <stdlib.h> #include <unistd.h> #include <paths.h> extern char **environ; int system(const char *command) { pid_t pid; sig_t intsave, quitsave; sigset_t mask, omask; int pstat; char *argp[] = {"sh", "-c", NULL, NULL}; if (!command) /* just checking... */ return(1); argp[2] = (char *)command; sigemptyset(&mask); sigaddset(&mask, SIGCHLD); sigprocmask(SIG_BLOCK, &mask, &omask); switch (pid = vfork()) { case -1: /* error */ sigprocmask(SIG_SETMASK, &omask, NULL); return(-1); case 0: /* child */ sigprocmask(SIG_SETMASK, &omask, NULL); execve(_PATH_BSHELL, argp, environ); _exit(127); } intsave = signal(SIGINT, SIG_IGN); quitsave = signal(SIGQUIT, SIG_IGN); pid = waitpid(pid, (int *)&pstat, 0); sigprocmask(SIG_SETMASK, &omask, NULL); (void)signal(SIGINT, intsave); (void)signal(SIGQUIT, quitsave); return (pid == -1 ? -1 : pstat); }