1 /*

     2  * Copyright (c) 2019, Google Inc. All rights reserved.

     3  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

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

     5  *

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

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

     8  * published by the Free Software Foundation.

     9  *

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

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

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

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

    14  * accompanied this code).

    15  *

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

    17  * 2 along with this work; if not, write to the Free Software Foundation,

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

    19  *

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

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

    22  * questions.

    23  */

    24 import java.lang.ProcessBuilder;

    25 import java.io.BufferedReader;

    26 import java.io.IOException;

    27 import java.io.InputStream;

    28 import java.io.InputStreamReader;

    29 

    30 public class T {

    31     public static boolean run() {

    32         boolean res = false;

    33         String echoInput = "foo";

    34         ProcessBuilder pb = new ProcessBuilder("echo", echoInput);

    35 

    36         try {

    37             // Starting a ProcessBuilder causes the process reaper thread to be

    38             // created. The process reaper thread has small stack size. In JDK

    39             // 13, the REAPER_DEFAULT_STACKSIZE is 128K. With JDK 8, it is 32K.

    40             // Using the process reaper thread can demonstrate the TLS problem.

    41             // The reaper thread can fail with StackOverflow in one of the

    42             // failure mode with certain TLS sizes. In another observed

    43             // failure mode the VM fails to create a thread with error message

    44             // 'Failed to start thread - pthread_create failed'.

    45             System.out.println("Starting a new process ...");

    46             Process process = pb.start();

    47             process.waitFor();

    48             String echoOutput = output(process.getInputStream());

    49             System.out.println("Echo Output: " + echoOutput);

    50             if (echoOutput.equals(echoInput)) {

    51                 res = true;

    52             } else {

    53                 // 'res' is false, fail

    54                 System.out.println("Unexpected Echo output: " + echoOutput +

    55                                    ", expects: " + echoInput);

    56             }

    57         } catch (Exception e) {

    58             System.out.println(e.toString());

    59             e.printStackTrace();

    60         }

    61         return res;

    62     }

    63 

    64     private static String output(InputStream inputStream) throws IOException {

    65         String s = "";

    66         try (BufferedReader br =

    67                  new BufferedReader(new InputStreamReader(inputStream))) {

    68             s = br.readLine();

    69         }

    70         return s;

    71     }

    72 }

    73