1 /* 2 * Copyright (c) 2015, 2017, 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 8137230 27 * @summary (fc) Infinite loop FileChannel.truncate 28 * @library /test/lib 29 * @build jdk.test.lib.Utils 30 * @run main/othervm/timeout=300 LoopingTruncate 31 */ 32 33 import java.nio.ByteBuffer; 34 import java.nio.channels.FileChannel; 35 import java.nio.channels.ClosedByInterruptException; 36 import java.nio.file.Files; 37 import java.nio.file.Path; 38 import static java.nio.file.StandardOpenOption.*; 39 import java.util.concurrent.TimeUnit; 40 import static jdk.test.lib.Utils.adjustTimeout; 41 42 public class LoopingTruncate { 43 44 // (int)FATEFUL_SIZE == -3 == IOStatus.INTERRUPTED 45 static long FATEFUL_SIZE = 0x1FFFFFFFDL; 46 47 // At least 20 seconds 48 static long TIMEOUT = adjustTimeout(20_000); 49 50 public static void main(String[] args) throws Throwable { 51 Path path = Files.createTempFile("LoopingTruncate.tmp", null); 52 try (FileChannel fc = FileChannel.open(path, CREATE, WRITE)) { 53 fc.position(FATEFUL_SIZE + 1L); 54 System.out.println(" Writing large file..."); 55 long t0 = System.nanoTime(); 56 fc.write(ByteBuffer.wrap(new byte[] {0})); 57 long t1 = System.nanoTime(); 58 System.out.printf(" Wrote large file in %d ns (%d ms) %n", 59 t1 - t0, TimeUnit.NANOSECONDS.toMillis(t1 - t0)); 60 61 Thread th = new Thread(() -> { 62 try { 63 System.out.println(" Truncating large file..."); 64 long t2 = System.nanoTime(); 65 fc.truncate(FATEFUL_SIZE); 66 long t3 = System.nanoTime(); 67 System.out.printf(" Truncated large file in %d ns (%d ms) %n", 68 t3 - t2, TimeUnit.NANOSECONDS.toMillis(t3 - t2)); 69 } catch (ClosedByInterruptException ignore) { 70 } catch (Exception e) { 71 throw new RuntimeException(e); 72 }}); 73 th.start(); 74 th.join(TIMEOUT); 75 76 if (th.isAlive()) { 77 System.err.println("=== Stack trace of the guilty thread:"); 78 for (StackTraceElement el : th.getStackTrace()) { 79 System.err.println("\t" + el); 80 } 81 System.err.println("==="); 82 83 th.interrupt(); 84 th.join(); 85 throw new RuntimeException("Failed to complete on time"); 86 } 87 } finally { 88 Files.deleteIfExists(path); 89 } 90 91 System.out.println("Test succeeded."); 92 System.out.flush(); 93 } 94 }