/*

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 * 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.

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/**

 * @test

 * @bug 8137121 8137230

 * @summary (fc) Infinite loop FileChannel.truncate

 * @library /lib/testlibrary

 * @build jdk.testlibrary.Utils

 * @run main/othervm/timeout=300 LoopingTruncate

 */

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;

import java.nio.channels.ClosedByInterruptException;

import java.nio.file.Files;

import java.nio.file.Path;

import static java.nio.file.StandardOpenOption.*;

import java.util.concurrent.TimeUnit;

import static jdk.testlibrary.Utils.adjustTimeout;

public class LoopingTruncate {

    // (int)FATEFUL_SIZE == -3 == IOStatus.INTERRUPTED

    static long FATEFUL_SIZE = 0x1FFFFFFFDL;

    // At least 20 seconds

    static long TIMEOUT = adjustTimeout(20_000);

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

        Path path = Files.createTempFile("LoopingTruncate.tmp", null);

        try (FileChannel fc = FileChannel.open(path, CREATE, WRITE)) {

            fc.position(FATEFUL_SIZE + 1L);

            System.out.println("  Writing large file...");

            long t0 = System.nanoTime();

            fc.write(ByteBuffer.wrap(new byte[] {0}));

            long t1 = System.nanoTime();

            System.out.printf("  Wrote large file in %d ns (%d ms) %n",

                t1 - t0, TimeUnit.NANOSECONDS.toMillis(t1 - t0));

            Thread th = new Thread(() -> {

                try {

                    System.out.println("  Truncating large file...");

                    long t2 = System.nanoTime();

                    fc.truncate(FATEFUL_SIZE);

                    long t3 = System.nanoTime();

                    System.out.printf("  Truncated large file in %d ns (%d ms) %n",

                        t3 - t2, TimeUnit.NANOSECONDS.toMillis(t3 - t2));

                } catch (ClosedByInterruptException ignore) {

                } catch (Exception e) {

                    throw new RuntimeException(e);

                }});

            th.start();

            th.join(TIMEOUT);

            if (th.isAlive()) {

                System.err.println("=== Stack trace of the guilty thread:");

                for (StackTraceElement el : th.getStackTrace()) {

                    System.err.println("\t" + el);

                }

                System.err.println("===");

                th.interrupt();

                th.join();

                throw new RuntimeException("Failed to complete on time");

            }

        } finally {

            Files.deleteIfExists(path);

        }

        System.out.println("Test succeeded.");

        System.out.flush();

    }

}