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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char *rcsid = "$OpenBSD: system.c,v 1.4 2001/09/04 23:35:58 millert Exp $"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <sys/types.h> 39 #include <sys/wait.h> 40 #include <signal.h> 41 #include <stdlib.h> 42 #include <unistd.h> 43 #include <paths.h> 44 45 extern char **environ; 46 47 int 48 system(command) 49 const char *command; 50 { 51 pid_t pid; 52 sig_t intsave, quitsave; 53 sigset_t mask, omask; 54 int pstat; 55 char *argp[] = {"sh", "-c", NULL, NULL}; 56 57 if (!command) /* just checking... */ 58 return(1); 59 60 argp[2] = (char *)command; 61 62 sigemptyset(&mask); 63 sigaddset(&mask, SIGCHLD); 64 sigprocmask(SIG_BLOCK, &mask, &omask); 65 switch(pid = vfork()) { 66 case -1: /* error */ 67 sigprocmask(SIG_SETMASK, &omask, NULL); 68 return(-1); 69 case 0: /* child */ 70 sigprocmask(SIG_SETMASK, &omask, NULL); 71 execve(_PATH_BSHELL, argp, environ); 72 _exit(127); 73 } 74 75 intsave = signal(SIGINT, SIG_IGN); 76 quitsave = signal(SIGQUIT, SIG_IGN); 77 pid = waitpid(pid, (int *)&pstat, 0); 78 sigprocmask(SIG_SETMASK, &omask, NULL); 79 (void)signal(SIGINT, intsave); 80 (void)signal(SIGQUIT, quitsave); 81 return(pid == -1 ? -1 : pstat); 82 } 83