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Datei: WaitFor.java Sprache: JAVA

/*
* Copyright (c) 2019, 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 8220684
* @summary Process.waitFor(long, TimeUnit) can return false for a process
*          that exited within the timeout
* @run main/othervm WaitFor
*/

import java.io.InputStream;
import java.io.OutputStream;
import java.util.concurrent.TimeUnit;

public class WaitFor {
    public static void main(String[] args) throws Throwable {
        int failCnt = 0;
        for (int i = 0; i < 30; ++i) {
            Process proc = new MyProcess(new ProcessBuilder("true").start());
            boolean exited = proc.waitFor(100, TimeUnit.MILLISECONDS);
            if (!exited && !proc.isAlive()) failCnt++;
        }
        if (failCnt > 10) {
            throw new RuntimeException(failCnt + " processes were still alive"
                + " after timeout");
        }
    }
}

/**
* This class uses the default implementation of java.lang.Process#waitFor(long,
* TimeUnit), and delegates all other calls to the actual implementation of
* Process.
*/
class MyProcess extends Process {
    Process impl;
    public MyProcess(Process impl) { this.impl = impl; }
    public OutputStream getOutputStream() { return impl.getOutputStream(); }
    public InputStream getInputStream() { return impl.getInputStream(); }
    public InputStream getErrorStream() { return impl.getErrorStream(); }
    public int waitFor() throws InterruptedException { return impl.waitFor(); }
    public int exitValue() { return impl.exitValue(); }
    public void destroy() { impl.destroy(); }
    public ProcessHandle toHandle() { return impl.toHandle(); }
}

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