1331722Seadler/* 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("$FreeBSD$"); 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 49276630Skib#pragma weak system 5055837Sjasoneint 51276630Skibsystem(const char *command) 521573Srgrimes{ 53276630Skib 54276630Skib return (((int (*)(const char *)) 55276630Skib __libc_interposing[INTERPOS_system])(command)); 56276630Skib} 57276630Skib 58276630Skibint 59276630Skib__libc_system(const char *command) 60276630Skib{ 6184417Salfred pid_t pid, savedpid; 6216117Sjraynard int pstat; 6316117Sjraynard struct sigaction ign, intact, quitact; 6416117Sjraynard sigset_t newsigblock, oldsigblock; 651573Srgrimes 661573Srgrimes if (!command) /* just checking... */ 671573Srgrimes return(1); 681573Srgrimes 6916117Sjraynard (void)sigemptyset(&newsigblock); 7016228Sjraynard (void)sigaddset(&newsigblock, SIGCHLD); 71255129Sjilles (void)sigaddset(&newsigblock, SIGINT); 72255129Sjilles (void)sigaddset(&newsigblock, SIGQUIT); 73287292Skib (void)__libc_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock); 74254297Speter switch(pid = vfork()) { 75287292Skib /* 76287292Skib * In the child, use unwrapped syscalls. libthr is in 77287292Skib * undefined state after vfork(). 78287292Skib */ 791573Srgrimes case -1: /* error */ 80287292Skib (void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL); 81254297Speter return (-1); 821573Srgrimes case 0: /* child */ 8316117Sjraynard /* 8416117Sjraynard * Restore original signal dispositions and exec the command. 8516117Sjraynard */ 86287292Skib (void)__sys_sigprocmask(SIG_SETMASK, &oldsigblock, NULL); 871573Srgrimes execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL); 881573Srgrimes _exit(127); 891573Srgrimes } 90254297Speter /* 91254297Speter * If we are running means that the child has either completed 92254297Speter * its execve, or has failed. 93254297Speter * Block SIGINT/QUIT because sh -c handles it and wait for 94254297Speter * it to clean up. 95254297Speter */ 96254297Speter memset(&ign, 0, sizeof(ign)); 97254297Speter ign.sa_handler = SIG_IGN; 98254297Speter (void)sigemptyset(&ign.sa_mask); 99287292Skib (void)__libc_sigaction(SIGINT, &ign, &intact); 100287292Skib (void)__libc_sigaction(SIGQUIT, &ign, &quitact); 101254297Speter savedpid = pid; 102254297Speter do { 103254297Speter pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0); 104254297Speter } while (pid == -1 && errno == EINTR); 105287292Skib (void)__libc_sigaction(SIGINT, &intact, NULL); 106287292Skib (void)__libc_sigaction(SIGQUIT, &quitact, NULL); 107287292Skib (void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL); 108287292Skib return (pid == -1 ? -1 : pstat); 1091573Srgrimes} 11055837Sjasone 111276630Skib__weak_reference(__libc_system, __system); 112276630Skib__weak_reference(__libc_system, _system); 113