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/*
* Copyright (c) 2006, 2017, 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
* @run main/othervm Zombies
* @bug 6474073 6180151
* @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.");
long mypid = ProcessHandle.current().pid();
System.out.printf("mypid: %d%n", mypid);
final Runtime rt = Runtime.getRuntime();
try {
rt.exec("no-such-file");
throw new Error("expected IOException not thrown");
} catch (IOException expected) {/* OK */}
try {
rt.exec(".");
throw new Error("expected IOException not thrown");
} catch (IOException expected) {/* OK */}
try {
rt.exec(TrueCommand, null, new File("no-such-dir"));
throw new Error("expected IOException not thrown");
} catch (IOException expected) {/* OK */}
Process p = rt.exec(TrueCommand);
ProcessHandle pp = p.toHandle().parent().orElse(null);
System.out.printf("%s pid: %d, parent: %s%n", TrueCommand, p.pid(), pp);
p.waitFor();
// Count all the zombies that are children of this Java process
final String[] zombieCounter = {
"/usr/bin/perl", "-e",
"$a=`/bin/ps -eo ppid,pid,s,command`;" +
"print @b=$a=~/^ *@{[getppid]} +[0-9]+ +Z.*$/mog;" +
"exit @b"
};
ProcessBuilder pb = new ProcessBuilder(zombieCounter);
pb.inheritIO();
int zombies = pb.start().waitFor();
if (zombies != 0) {
throw new Error(zombies + " zombies!");
}
}
}
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