1 /* $NetBSD: system.c,v 1.18 2003/03/04 19:44:10 nathanw 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 1.18 2003/03/04 19:44:10 nathanw 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 #include "reentrant.h" 54 55 #ifdef _REENTRANT 56 extern rwlock_t __environ_lock; 57 #endif 58 extern char **environ; 59 60 int 61 system(command) 62 const char *command; 63 { 64 pid_t pid; 65 struct sigaction intsa, quitsa, sa; 66 sigset_t nmask, omask; 67 int pstat; 68 char *argp[] = {"sh", "-c", /* LINTED */(char *)command, NULL}; 69 70 if (command == NULL) /* just checking... */ 71 return(1); 72 73 sa.sa_handler = SIG_IGN; 74 sigemptyset(&sa.sa_mask); 75 sa.sa_flags = 0; 76 77 if (sigaction(SIGINT, &sa, &intsa) == -1) 78 return -1; 79 if (sigaction(SIGQUIT, &sa, &quitsa) == -1) 80 return -1; 81 82 sigemptyset(&nmask); 83 sigaddset(&nmask, SIGCHLD); 84 if (sigprocmask(SIG_BLOCK, &nmask, &omask) == -1) 85 return -1; 86 87 rwlock_rdlock(&__environ_lock); 88 switch(pid = vfork()) { 89 case -1: /* error */ 90 rwlock_unlock(&__environ_lock); 91 sigaction(SIGINT, &intsa, NULL); 92 sigaction(SIGQUIT, &quitsa, NULL); 93 (void)sigprocmask(SIG_SETMASK, &omask, NULL); 94 return -1; 95 case 0: /* child */ 96 sigaction(SIGINT, &intsa, NULL); 97 sigaction(SIGQUIT, &quitsa, NULL); 98 (void)sigprocmask(SIG_SETMASK, &omask, NULL); 99 execve(_PATH_BSHELL, argp, environ); 100 _exit(127); 101 } 102 rwlock_unlock(&__environ_lock); 103 104 while (waitpid(pid, &pstat, 0) == -1) { 105 if (errno != EINTR) { 106 pstat = -1; 107 break; 108 } 109 } 110 111 sigaction(SIGINT, &intsa, NULL); 112 sigaction(SIGQUIT, &quitsa, NULL); 113 (void)sigprocmask(SIG_SETMASK, &omask, NULL); 114 115 return (pstat); 116 } 117