/*

 * Copyright (c) 2014, 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.

 */

/* @test

 * @bug 8054029

 * @summary Block devices should not report size=0 on Linux

 */

import java.io.RandomAccessFile;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.nio.channels.FileChannel;

import java.nio.file.AccessDeniedException;

import java.nio.file.NoSuchFileException;

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

public class BlockDeviceSize {

    private static final String BLK_FNAME = "/dev/sda1";

    private static final Path BLK_PATH = Paths.get(BLK_FNAME);

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

        try (FileChannel ch = FileChannel.open(BLK_PATH, READ);

             RandomAccessFile file = new RandomAccessFile(BLK_FNAME, "r")) {

            long size1 = ch.size();

            long size2 = file.length();

            if (size1 != size2) {

                throw new RuntimeException("size differs when retrieved" +

                        " in different ways: " + size1 + " != " + size2);

            }

            System.out.println("OK");

        } catch (NoSuchFileException nsfe) {

            System.err.println("File " + BLK_FNAME + " not found." +

                    " Skipping test");

        } catch (AccessDeniedException ade) {

            System.err.println("Access to " + BLK_FNAME + " is denied." +

                    " Run test as root.");

        }

    }

}