/*

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

 *

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 *

 * 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).

 *

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

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 */

/*

 * @test

 * @key regression

 * @bug 8012015

 * @summary Make sure reserved (but uncommitted) memory is not accessible

 * @library /testlibrary /test/lib

 * @modules java.base/sun.misc

 *          java.management

 * @build ReserveMemory

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main ReserveMemory

 */

import jdk.test.lib.*;

import sun.hotspot.WhiteBox;

public class ReserveMemory {

  private static boolean isWindows() {

    return System.getProperty("os.name").toLowerCase().startsWith("win");

  }

  private static boolean isOsx() {

    return System.getProperty("os.name").toLowerCase().startsWith("mac");

  }

  public static void main(String args[]) throws Exception {

    if (args.length > 0) {

      WhiteBox.getWhiteBox().readReservedMemory();

      throw new Exception("Read of reserved/uncommitted memory unexpectedly succeeded, expected crash!");

    }

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

          "-Xbootclasspath/a:.",

          "-XX:+UnlockDiagnosticVMOptions",

          "-XX:+WhiteBoxAPI",

          "-XX:-TransmitErrorReport",

          "-XX:-CreateCoredumpOnCrash",

          "-Xmx32m",

          "ReserveMemory",

          "test");

    OutputAnalyzer output = new OutputAnalyzer(pb.start());

    if (isWindows()) {

      output.shouldContain("EXCEPTION_ACCESS_VIOLATION");

    } else if (isOsx()) {

      output.shouldContain("SIGBUS");

    } else {

      output.shouldContain("SIGSEGV");

    }

  }

}