/*
 * 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. 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.
 *
 * @(#)system.c 8.1 (Berkeley) 6/4/93
 * $FreeBSD: src/lib/libc/stdlib/system.c,v 1.11 2007/01/09 00:28:10 imp 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"

int __system(const char *);

int
__system(const char *command)
{
        pid_t pid, savedpid;
        int pstat;
        struct sigaction ign, intact, quitact;
        sigset_t newsigblock, oldsigblock;

        if (!command)           /* just checking... */
                return(1);

        /*
         * Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save
         * existing signal dispositions.
         */
        ign.sa_handler = SIG_IGN;
        sigemptyset(&ign.sa_mask);
        ign.sa_flags = 0;
        _sigaction(SIGINT, &ign, &intact);
        _sigaction(SIGQUIT, &ign, &quitact);
        sigemptyset(&newsigblock);
        sigaddset(&newsigblock, SIGCHLD);
        _sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
        switch(pid = fork()) {
        case -1:                        /* error */
                break;
        case 0:                         /* child */
                /*
                 * Restore original signal dispositions and exec the command.
                 */
                _sigaction(SIGINT, &intact, NULL);
                _sigaction(SIGQUIT,  &quitact, NULL);
                _sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
                execl(_PATH_BSHELL, "sh", "-c", command, NULL);
                _exit(127);
        default:                        /* parent */
                savedpid = pid;
                do {
                        pid = _wait4(savedpid, &pstat, 0, NULL);
                } while (pid == -1 && errno == EINTR);
                break;
        }
        _sigaction(SIGINT, &intact, NULL);
        _sigaction(SIGQUIT,  &quitact, NULL);
        _sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
        return(pid == -1 ? -1 : pstat);
}

__weak_reference(__system, system);
__weak_reference(__system, _system);