101 lines
3.7 KiB
Java
101 lines
3.7 KiB
Java
/*
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* Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.nio.ByteBuffer;
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import java.nio.channels.AsynchronousFileChannel;
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import java.nio.channels.FileChannel;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import static java.nio.file.StandardOpenOption.*;
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import java.util.concurrent.ExecutionException;
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/* @test
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* @bug 8263898
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* @summary Verify stream and channel behavior with NUL device
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* @requires os.family == "windows"
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* @run main NulDevice
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*/
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public class NulDevice {
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public static void main(String[] args)
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throws ExecutionException, InterruptedException, IOException {
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Path path = Path.of("nul");
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try (OutputStream os = Files.newOutputStream(path)) {
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os.write(0x02);
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try (InputStream is = Files.newInputStream(path);) {
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if (is.available() != 0) {
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throw new RuntimeException("No bytes should be available");
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}
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int aByte = is.read();
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if (aByte != -1) {
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throw new RuntimeException("Should only read -1 from NUL");
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}
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}
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}
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try (OutputStream os = Files.newOutputStream(path, WRITE)) {
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os.write(0x02);
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}
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try (FileChannel ch = FileChannel.open(path, CREATE, TRUNCATE_EXISTING, WRITE)) {
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byte[] bytes = "Whatever".getBytes();
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ByteBuffer buf = ByteBuffer.allocate(2*bytes.length);
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buf.put(bytes);
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int nw = ch.write(buf);
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if (nw != bytes.length) {
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throw new RuntimeException("Should write " + bytes.length +
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" to NUL");
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}
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}
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try (FileChannel ch = FileChannel.open(path, READ)) {
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if (ch.size() != 0) {
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throw new RuntimeException("Size should be zero");
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}
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ByteBuffer buf = ByteBuffer.allocate(10);
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int nr = ch.read(buf);
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if (nr != -1) {
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throw new RuntimeException("Read returns " + nr + " not -1");
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}
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}
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try (AsynchronousFileChannel ch = AsynchronousFileChannel.open(path, READ, WRITE)) {
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if (ch.size() != 0) {
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throw new RuntimeException("Size should be zero");
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}
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int nw = ch.write(ByteBuffer.wrap(new byte[] {(byte)0x02}), 0L).get();
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if (nw != 1) {
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throw new RuntimeException("Wrote " + nw + " bytes, not one");
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}
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ByteBuffer buf = ByteBuffer.allocate(10);
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int nr = ch.read(buf, 0L).get();
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if (nr != -1) {
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throw new RuntimeException("Read returns " + nr + " not -1");
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}
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}
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}
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}
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