system.c revision 255129
11573Srgrimes/* 21573Srgrimes * Copyright (c) 1988, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * Redistribution and use in source and binary forms, with or without 61573Srgrimes * modification, are permitted provided that the following conditions 71573Srgrimes * are met: 81573Srgrimes * 1. Redistributions of source code must retain the above copyright 91573Srgrimes * notice, this list of conditions and the following disclaimer. 101573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111573Srgrimes * notice, this list of conditions and the following disclaimer in the 121573Srgrimes * documentation and/or other materials provided with the distribution. 13251672Semaste * 3. Neither the name of the University nor the names of its contributors 141573Srgrimes * may be used to endorse or promote products derived from this software 151573Srgrimes * without specific prior written permission. 161573Srgrimes * 171573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271573Srgrimes * SUCH DAMAGE. 281573Srgrimes */ 291573Srgrimes 301573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 311573Srgrimesstatic char sccsid[] = "@(#)system.c 8.1 (Berkeley) 6/4/93"; 321573Srgrimes#endif /* LIBC_SCCS and not lint */ 3392986Sobrien#include <sys/cdefs.h> 3492986Sobrien__FBSDID("$FreeBSD: head/lib/libc/stdlib/system.c 255129 2013-09-01 19:59:54Z jilles $"); 351573Srgrimes 3671579Sdeischen#include "namespace.h" 371573Srgrimes#include <sys/types.h> 381573Srgrimes#include <sys/wait.h> 391573Srgrimes#include <signal.h> 401573Srgrimes#include <stdlib.h> 411573Srgrimes#include <stddef.h> 42254297Speter#include <string.h> 431573Srgrimes#include <unistd.h> 441573Srgrimes#include <paths.h> 4516117Sjraynard#include <errno.h> 4671579Sdeischen#include "un-namespace.h" 4771579Sdeischen#include "libc_private.h" 481573Srgrimes 4955837Sjasoneint 50200150Sed__system(const char *command) 511573Srgrimes{ 5284417Salfred pid_t pid, savedpid; 5316117Sjraynard int pstat; 5416117Sjraynard struct sigaction ign, intact, quitact; 5516117Sjraynard sigset_t newsigblock, oldsigblock; 561573Srgrimes 571573Srgrimes if (!command) /* just checking... */ 581573Srgrimes return(1); 591573Srgrimes 6016117Sjraynard (void)sigemptyset(&newsigblock); 6116228Sjraynard (void)sigaddset(&newsigblock, SIGCHLD); 62255129Sjilles (void)sigaddset(&newsigblock, SIGINT); 63255129Sjilles (void)sigaddset(&newsigblock, SIGQUIT); 6471579Sdeischen (void)_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock); 65254297Speter switch(pid = vfork()) { 661573Srgrimes case -1: /* error */ 67254297Speter (void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL); 68254297Speter return (-1); 691573Srgrimes case 0: /* child */ 7016117Sjraynard /* 7116117Sjraynard * Restore original signal dispositions and exec the command. 7216117Sjraynard */ 7371579Sdeischen (void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL); 741573Srgrimes execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL); 751573Srgrimes _exit(127); 761573Srgrimes } 77254297Speter /* 78254297Speter * If we are running means that the child has either completed 79254297Speter * its execve, or has failed. 80254297Speter * Block SIGINT/QUIT because sh -c handles it and wait for 81254297Speter * it to clean up. 82254297Speter */ 83254297Speter memset(&ign, 0, sizeof(ign)); 84254297Speter ign.sa_handler = SIG_IGN; 85254297Speter (void)sigemptyset(&ign.sa_mask); 86254297Speter (void)_sigaction(SIGINT, &ign, &intact); 87254297Speter (void)_sigaction(SIGQUIT, &ign, &quitact); 88254297Speter savedpid = pid; 89254297Speter do { 90254297Speter pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0); 91254297Speter } while (pid == -1 && errno == EINTR); 9271579Sdeischen (void)_sigaction(SIGINT, &intact, NULL); 9371579Sdeischen (void)_sigaction(SIGQUIT, &quitact, NULL); 9471579Sdeischen (void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL); 9516117Sjraynard return(pid == -1 ? -1 : pstat); 961573Srgrimes} 9755837Sjasone 9856698Sjasone__weak_reference(__system, system); 9971579Sdeischen__weak_reference(__system, _system); 100