1 /* $NetBSD: system.c,v 1.12 1997/07/13 20:17:05 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1988 The Regents of the University of California. 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char *sccsid = "from: @(#)system.c 5.10 (Berkeley) 2/23/91"; 40 #else 41 __RCSID("$NetBSD: system.c,v 1.12 1997/07/13 20:17:05 christos Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include <sys/types.h> 46 #include <sys/wait.h> 47 #include <signal.h> 48 #include <stdlib.h> 49 #include <unistd.h> 50 #include <paths.h> 51 52 extern char **environ; 53 54 int 55 system(command) 56 const char *command; 57 { 58 pid_t pid; 59 sig_t intsave, quitsave; 60 int omask; 61 int pstat; 62 char *argp[] = {"sh", "-c", (char *) command, NULL}; 63 64 if (!command) /* just checking... */ 65 return(1); 66 67 omask = sigblock(sigmask(SIGCHLD)); 68 switch(pid = vfork()) { 69 case -1: /* error */ 70 (void)sigsetmask(omask); 71 return(-1); 72 case 0: /* child */ 73 (void)sigsetmask(omask); 74 execve(_PATH_BSHELL, argp, environ); 75 _exit(127); 76 } 77 78 intsave = signal(SIGINT, SIG_IGN); 79 quitsave = signal(SIGQUIT, SIG_IGN); 80 pid = waitpid(pid, (int *)&pstat, 0); 81 (void)sigsetmask(omask); 82 (void)signal(SIGINT, intsave); 83 (void)signal(SIGQUIT, quitsave); 84 return(pid == -1 ? -1 : pstat); 85 } 86