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Datei: T.java Sprache: JAVA

/*
* Copyright (c) 2019, Google Inc. All rights reserved.
* 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.
*/
import java.lang.ProcessBuilder;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class T {
    public static boolean run() {
        boolean res = false;
        String echoInput = "foo";
        ProcessBuilder pb = new ProcessBuilder("echo", echoInput);

        try {
            // Starting a ProcessBuilder causes the process reaper thread to be
            // created. The process reaper thread has small stack size. In JDK
            // 13, the REAPER_DEFAULT_STACKSIZE is 128K. With JDK 8, it is 32K.
            // Using the process reaper thread can demonstrate the TLS problem.
            // The reaper thread can fail with StackOverflow in one of the
            // failure mode with certain TLS sizes. In another observed
            // failure mode the VM fails to create a thread with error message
            // 'Failed to start thread - pthread_create failed'.
            System.out.println("Starting a new process ...");
            Process process = pb.start();
            process.waitFor();
            String echoOutput = output(process.getInputStream());
            System.out.println("Echo Output: " + echoOutput);
            if (echoOutput.equals(echoInput)) {
                res = true;
            } else {
                // 'res' is false, fail
                System.out.println("Unexpected Echo output: " + echoOutput +
                                   ", expects: " + echoInput);
            }
        } catch (Exception e) {
            System.out.println(e.toString());
            e.printStackTrace();
        }
        return res;
    }

    private static String output(InputStream inputStream) throws IOException {
        String s = "";
        try (BufferedReader br =
                 new BufferedReader(new InputStreamReader(inputStream))) {
            s = br.readLine();
        }
        return s;
    }
}

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