90 lines
3.1 KiB
Java
90 lines
3.1 KiB
Java
/*
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* Copyright (c) 2006, 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @run main/othervm Zombies
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* @bug 6474073 6180151
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* @summary Make sure zombies don't get created on Unix
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* @author Martin Buchholz
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*/
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import java.io.*;
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public class Zombies {
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static final String os = System.getProperty("os.name");
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static final String TrueCommand = os.contains("OS X")?
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"/usr/bin/true" : "/bin/true";
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public static void main(String[] args) throws Throwable {
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if (! new File("/usr/bin/perl").canExecute() ||
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! new File("/bin/ps").canExecute())
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return;
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System.out.println("Looks like a Unix system.");
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long mypid = ProcessHandle.current().pid();
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System.out.printf("mypid: %d%n", mypid);
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final Runtime rt = Runtime.getRuntime();
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try {
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String[] cmd = {"no-such-file"};
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rt.exec(cmd);
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throw new Error("expected IOException not thrown");
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} catch (IOException expected) {/* OK */}
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try {
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String[] cmd = {"."};
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rt.exec(cmd);
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throw new Error("expected IOException not thrown");
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} catch (IOException expected) {/* OK */}
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try {
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String[] cmd = {TrueCommand};
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rt.exec(cmd, null, new File("no-such-dir"));
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throw new Error("expected IOException not thrown");
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} catch (IOException expected) {/* OK */}
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Process p = rt.exec(TrueCommand);
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ProcessHandle pp = p.toHandle().parent().orElse(null);
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System.out.printf("%s pid: %d, parent: %s%n", TrueCommand, p.pid(), pp);
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p.waitFor();
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// Count all the zombies that are children of this Java process
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final String[] zombieCounter = {
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"/usr/bin/perl", "-e",
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"$a=`/bin/ps -eo ppid,pid,s,command`;" +
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"print @b=$a=~/^ *@{[getppid]} +[0-9]+ +Z.*$/mog;" +
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"exit @b"
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};
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ProcessBuilder pb = new ProcessBuilder(zombieCounter);
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pb.inheritIO();
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int zombies = pb.start().waitFor();
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if (zombies != 0) {
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throw new Error(zombies + " zombies!");
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}
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}
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}
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