1 /* 2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * @test 26 * @bug 8137121 27 * @summary Infinite loop in sun.nio.ch.FileChannelImpl.truncate 28 * @run main/othervm InfTrunc 29 */ 30 31 import java.io.IOException; 32 import java.nio.ByteBuffer; 33 import java.nio.channels.FileChannel; 34 import java.nio.channels.SeekableByteChannel; 35 import java.nio.file.Files; 36 import java.nio.file.Path; 37 import static java.nio.file.StandardOpenOption.*; 38 import java.util.EnumSet; 39 40 public class InfTrunc { 41 42 // (int)FATEFUL_SIZE == -3 == IOStatus.INTERRUPTED 43 static long FATEFUL_SIZE = 0x1FFFFFFFDL; 44 45 static long TIMEOUT = 10_000; // 10 seconds 46 47 public static void main(String[] args) throws Throwable { 48 Path path = Files.createTempFile("inftrunc", null); 49 try { 50 Thread th = new Thread(() -> { 51 try (SeekableByteChannel ch = Files.newByteChannel(path, 52 EnumSet.of(CREATE, WRITE))) { 53 ch.position(FATEFUL_SIZE + 1L); 54 ch.write(ByteBuffer.wrap(new byte[] {0})); 55 ch.truncate(FATEFUL_SIZE); 56 } catch (IOException ioe) { 57 throw new RuntimeException(ioe); 58 }}); 59 th.start(); 60 th.join(TIMEOUT); 61 62 if (th.isAlive()) { 63 th.interrupt(); 64 throw new RuntimeException("Failed to complete on time"); 65 } 66 } finally { 67 Files.deleteIfExists(path); 68 } 69 } 70 }