1 /*
   2  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 8220684
  27  * @summary Process.waitFor(long, TimeUnit) can return false for a process
  28  *          that exited within the timeout
  29  * @run main/othervm WaitFor
  30  */
  31 
  32 import java.io.InputStream;
  33 import java.io.OutputStream;
  34 import java.util.concurrent.TimeUnit;
  35 
  36 public class WaitFor {
  37     public static void main(String[] args) throws Throwable {
  38         int failCnt = 0;
  39         for (int i = 0; i < 100; ++i) {
  40             Process proc = new MyProcess(new ProcessBuilder("true").start());
  41             boolean exited = proc.waitFor(100, TimeUnit.MILLISECONDS);
  42             if (!exited) failCnt++;
  43         }
  44         if (failCnt > 10) {
  45             throw new RuntimeException(failCnt + " processes were still alive"
  46                 + " after timeout");
  47         }
  48     }
  49 }
  50 
  51 /**
  52  * This class uses the default implementation of java.lang.Process#waitFor(long,
  53  * TimeUnit), and delegated all other calls to the actual implementation of
  54  * Process.
  55  */
  56 class MyProcess extends Process {
  57     Process impl;
  58     public MyProcess(Process impl) { this.impl = impl; }
  59     public OutputStream getOutputStream() { return impl.getOutputStream(); }
  60     public InputStream getInputStream() { return impl.getInputStream(); }
  61     public InputStream getErrorStream() { return impl.getErrorStream(); }
  62     public int waitFor() throws InterruptedException { return impl.waitFor(); }
  63     public int exitValue() { return impl.exitValue(); }
  64     public void destroy() { impl.destroy(); }
  65     public ProcessHandle toHandle() { return impl.toHandle(); }
  66 }