/*

 * Copyright (c) 2006, 2012, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 6474073

 * @summary Make sure zombies don't get created on Unix

 * @author Martin Buchholz

 */

import java.io.*;

public class Zombies {

    static final String os = System.getProperty("os.name");

    static final String TrueCommand = os.contains("OS X")?

        "/usr/bin/true" : "/bin/true";

    public static void main(String[] args) throws Throwable {

        if (! new File("/usr/bin/perl").canExecute() ||

            ! new File("/bin/ps").canExecute())

            return;

        System.out.println("Looks like a Unix system.");

        final Runtime rt = Runtime.getRuntime();

        try {

            rt.exec("no-such-file");

            throw new Error("expected IOException not thrown");

        } catch (IOException _) {/* OK */}

        try {

            rt.exec(".");

            throw new Error("expected IOException not thrown");

        } catch (IOException _) {/* OK */}

        try {

            rt.exec(TrueCommand, null, new File("no-such-dir"));

            throw new Error("expected IOException not thrown");

        } catch (IOException _) {/* OK */}

        rt.exec(TrueCommand).waitFor();

        // Count all the zombies that are children of this Java process

        final String[] zombieCounter = {

            "/usr/bin/perl", "-e",

            "exit @{[`/bin/ps -eo ppid,s` =~ /^ *@{[getppid]} +Z$/mog]}"

        };

        int zombies = rt.exec(zombieCounter).waitFor();

        if (zombies != 0) throw new Error(zombies + " zombies!");

    }

}