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

 *

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

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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,

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

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/* @test

 * @summary Test failure paths for MAP_SYNC FileChannel.map of non-DAX files

 * @modules java.base/jdk.internal.misc

 * @run main MapSyncFail true

 * @run main MapSyncFail false

 */

import java.io.*;

import java.nio.*;

import java.util.*;

import java.nio.channels.*;

import jdk.nio.mapmode.*;

import jdk.internal.misc.Unsafe;

public class MapSyncFail {

    public static final int K = 1024;

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

        if (args.length != 1) {

            throw new Exception("Expected true or false as argument");

        }

        boolean is_rw = Boolean.valueOf(args[0]);

        FileChannel.MapMode mode = (is_rw ? ExtendedMapMode.READ_WRITE_SYNC : ExtendedMapMode.READ_ONLY_SYNC);

        // it is assumed that /tmp is not a DAX file system

        File file = File.createTempFile("MapSyncFail", null);

        file.deleteOnExit();

        long filesize = (8 * K);

        try (RandomAccessFile raf = new RandomAccessFile(file, "rw")) {

            raf.setLength(filesize);

            FileChannel fc = raf.getChannel();

            MappedByteBuffer mbb = fc.map(mode, 0, filesize);

        } catch(IOException ioe) {

            // when writeback is enabled for the current os/cpu

            // combination the underlying mmap should be attempted and

            // the map call should fail with IOException

            if (!Unsafe.isWritebackEnabled()) {

                throw new Exception("IOException not expected");

            }

            System.out.println("caught " + ioe);

            ioe.printStackTrace();

            return;

        } catch (UnsupportedOperationException uoe) {

            // when writeback is not enabled for the current os/cpu

            // combination the mmap should not be attempted and the

            // map call should fail with UnsupportedOperationException

            if (Unsafe.isWritebackEnabled()) {

                throw new Exception("UnsupportedOperationException not expected");

            }

            System.out.println("caught " + uoe);

            uoe.printStackTrace();

            return;

        }

        throw new Exception("expected IOException or UnsupportedOperationException");

    }

}