1 /* $NetBSD: system.c,v 1.16 1998/11/15 17:13:52 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1993 5 * The Regents of the University of California. 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[] = "@(#)system.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: system.c,v 1.16 1998/11/15 17:13:52 christos Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 #include <sys/types.h> 47 #include <sys/wait.h> 48 #include <signal.h> 49 #include <stdlib.h> 50 #include <unistd.h> 51 #include <paths.h> 52 53 extern char **environ; 54 55 int 56 system(command) 57 const char *command; 58 { 59 pid_t pid; 60 sig_t intsave, quitsave; 61 sigset_t nmask, omask; 62 int pstat; 63 char *argp[] = {"sh", "-c", /* LINTED */(char *)command, NULL}; 64 65 if (!command) /* just checking... */ 66 return(1); 67 68 sigemptyset(&nmask); 69 sigaddset(&nmask, SIGCHLD); 70 if (sigprocmask(SIG_BLOCK, &nmask, &omask) == -1) 71 return -1; 72 switch(pid = vfork()) { 73 case -1: /* error */ 74 (void)sigprocmask(SIG_SETMASK, &omask, NULL); 75 return(-1); 76 case 0: /* child */ 77 (void)sigprocmask(SIG_SETMASK, &omask, NULL); 78 execve(_PATH_BSHELL, argp, environ); 79 _exit(127); 80 } 81 82 intsave = signal(SIGINT, SIG_IGN); 83 quitsave = signal(SIGQUIT, SIG_IGN); 84 pid = waitpid(pid, (int *)&pstat, 0); 85 (void)sigprocmask(SIG_SETMASK, &omask, NULL); 86 (void)signal(SIGINT, intsave); 87 (void)signal(SIGQUIT, quitsave); 88 return(pid == -1 ? -1 : pstat); 89 } 90