1 /* 2 * Copyright (c) 1988 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char *rcsid = "$OpenBSD: system.c,v 1.6 2003/06/02 20:18:38 millert Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/types.h> 35 #include <sys/wait.h> 36 #include <signal.h> 37 #include <stdlib.h> 38 #include <unistd.h> 39 #include <paths.h> 40 41 extern char **environ; 42 43 int 44 system(command) 45 const char *command; 46 { 47 pid_t pid; 48 sig_t intsave, quitsave; 49 sigset_t mask, omask; 50 int pstat; 51 char *argp[] = {"sh", "-c", NULL, NULL}; 52 53 if (!command) /* just checking... */ 54 return(1); 55 56 argp[2] = (char *)command; 57 58 sigemptyset(&mask); 59 sigaddset(&mask, SIGCHLD); 60 sigprocmask(SIG_BLOCK, &mask, &omask); 61 switch (pid = vfork()) { 62 case -1: /* error */ 63 sigprocmask(SIG_SETMASK, &omask, NULL); 64 return(-1); 65 case 0: /* child */ 66 sigprocmask(SIG_SETMASK, &omask, NULL); 67 execve(_PATH_BSHELL, argp, environ); 68 _exit(127); 69 } 70 71 intsave = signal(SIGINT, SIG_IGN); 72 quitsave = signal(SIGQUIT, SIG_IGN); 73 pid = waitpid(pid, (int *)&pstat, 0); 74 sigprocmask(SIG_SETMASK, &omask, NULL); 75 (void)signal(SIGINT, intsave); 76 (void)signal(SIGQUIT, quitsave); 77 return (pid == -1 ? -1 : pstat); 78 } 79