/* * Copyright (c) 1988, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)system.c 8.1 (Berkeley) 6/4/93"; #endif /* LIBC_SCCS and not lint */ #include <sys/cdefs.h> __FBSDID("$FreeBSD: src/lib/libc/stdlib/system.c,v 1.10 2002/03/22 21:53:10 obrien Exp $"); #include "namespace.h" #include <sys/types.h> #include <sys/wait.h> #include <signal.h> #include <stdlib.h> #include <stddef.h> #include <unistd.h> #include <paths.h> #include <errno.h> #include "un-namespace.h" #include "libc_private.h" #if __DARWIN_UNIX03 #include <pthread.h> static pthread_mutex_t __systemfn_mutex = PTHREAD_MUTEX_INITIALIZER; extern int __unix_conforming; #ifdef VARIANT_CANCELABLE extern void _pthread_testcancel(pthread_t thread, int isconforming); #endif /* VARIANT_CANCELABLE */ #endif /* __DARWIN_UNIX03 */ int __system(command) const char *command; { pid_t pid, savedpid; int pstat; struct sigaction ign, intact, quitact; sigset_t newsigblock, oldsigblock; #if __DARWIN_UNIX03 if (__unix_conforming == 0) __unix_conforming = 1; #ifdef VARIANT_CANCELABLE _pthread_testcancel(pthread_self(), 1); #endif /* VARIANT_CANCELABLE */ #endif /* __DARWIN_UNIX03 */ if (!command) { /* just checking... */ if (access(_PATH_BSHELL, F_OK) == -1) /* if no sh or no access */ return(0); else return(1); } #if __DARWIN_UNIX03 pthread_mutex_lock(&__systemfn_mutex); #endif /* __DARWIN_UNIX03 */ /* * Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save * existing signal dispositions. */ ign.sa_handler = SIG_IGN; (void)sigemptyset(&ign.sa_mask); ign.sa_flags = 0; (void)_sigaction(SIGINT, &ign, &intact); (void)_sigaction(SIGQUIT, &ign, &quitact); (void)sigemptyset(&newsigblock); (void)sigaddset(&newsigblock, SIGCHLD); (void)_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock); switch(pid = fork()) { case -1: /* error */ break; case 0: /* child */ /* * Restore original signal dispositions and exec the command. */ (void)_sigaction(SIGINT, &intact, NULL); (void)_sigaction(SIGQUIT, &quitact, NULL); (void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL); #if __DARWIN_UNIX03 pthread_mutex_unlock(&__systemfn_mutex); #endif /* __DARWIN_UNIX03 */ execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL); _exit(127); default: /* parent */ savedpid = pid; do { pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0); } while (pid == -1 && errno == EINTR); break; } (void)_sigaction(SIGINT, &intact, NULL); (void)_sigaction(SIGQUIT, &quitact, NULL); (void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL); #if __DARWIN_UNIX03 pthread_mutex_unlock(&__systemfn_mutex); #endif /* __DARWIN_UNIX03 */ return(pid == -1 ? -1 : pstat); } __weak_reference(__system, system); __weak_reference(__system, _system);