1 /* $NetBSD: system.c,v 1.17 2001/10/31 13:31:26 kleink 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 1.17 2001/10/31 13:31:26 kleink 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 <errno.h> 49 #include <signal.h> 50 #include <stdlib.h> 51 #include <unistd.h> 52 #include <paths.h> 53 54 extern char **environ; 55 56 int 57 system(command) 58 const char *command; 59 { 60 pid_t pid; 61 struct sigaction intsa, quitsa, sa; 62 sigset_t nmask, omask; 63 int pstat; 64 char *argp[] = {"sh", "-c", /* LINTED */(char *)command, NULL}; 65 66 if (command == NULL) /* just checking... */ 67 return(1); 68 69 sa.sa_handler = SIG_IGN; 70 sigemptyset(&sa.sa_mask); 71 sa.sa_flags = 0; 72 73 if (sigaction(SIGINT, &sa, &intsa) == -1) 74 return -1; 75 if (sigaction(SIGQUIT, &sa, &quitsa) == -1) 76 return -1; 77 78 sigemptyset(&nmask); 79 sigaddset(&nmask, SIGCHLD); 80 if (sigprocmask(SIG_BLOCK, &nmask, &omask) == -1) 81 return -1; 82 83 switch(pid = vfork()) { 84 case -1: /* error */ 85 sigaction(SIGINT, &intsa, NULL); 86 sigaction(SIGQUIT, &quitsa, NULL); 87 (void)sigprocmask(SIG_SETMASK, &omask, NULL); 88 return -1; 89 case 0: /* child */ 90 sigaction(SIGINT, &intsa, NULL); 91 sigaction(SIGQUIT, &quitsa, NULL); 92 (void)sigprocmask(SIG_SETMASK, &omask, NULL); 93 execve(_PATH_BSHELL, argp, environ); 94 _exit(127); 95 } 96 97 while (waitpid(pid, &pstat, 0) == -1) { 98 if (errno != EINTR) { 99 pstat = -1; 100 break; 101 } 102 } 103 104 sigaction(SIGINT, &intsa, NULL); 105 sigaction(SIGQUIT, &quitsa, NULL); 106 (void)sigprocmask(SIG_SETMASK, &omask, NULL); 107 108 return (pstat); 109 } 110