| /* |
| * Copyright (c) 2007, 2018, 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. |
| */ |
| |
| import java.io.File; |
| import java.io.FileDescriptor; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.RandomAccessFile; |
| import java.lang.management.ManagementFactory; |
| import java.lang.management.OperatingSystemMXBean; |
| import java.lang.ref.Cleaner; |
| import java.lang.ref.Reference; |
| import java.lang.ref.ReferenceQueue; |
| import java.lang.ref.WeakReference; |
| import java.lang.reflect.Field; |
| import java.nio.file.Path; |
| import java.util.ArrayDeque; |
| import java.util.HashSet; |
| |
| import com.sun.management.UnixOperatingSystemMXBean; |
| |
| import jdk.test.lib.util.FileUtils; |
| |
| /** |
| * @test |
| * @bug 8080225 |
| * @library /test/lib |
| * @build jdk.test.lib.util.FileUtils UnreferencedRAFClosesFd |
| * @modules java.base/java.io:open |
| * @summary Test to ensure that an unclosed and unreferenced RandomAccessFile closes the fd |
| * @run main/othervm UnreferencedRAFClosesFd |
| */ |
| public class UnreferencedRAFClosesFd { |
| |
| static final String FILE_NAME = "empty.txt"; |
| |
| /* standalone interface */ |
| public static void main(String argv[]) throws Exception { |
| |
| File inFile= new File(System.getProperty("test.dir", "."), FILE_NAME); |
| inFile.createNewFile(); |
| inFile.deleteOnExit(); |
| |
| FileUtils.listFileDescriptors(System.out); |
| long fdCount0 = getFdCount(); |
| |
| String name = inFile.getPath(); |
| RandomAccessFile raf; |
| try { |
| // raf is explicitly *not* closed to allow cleaner to work |
| raf = new RandomAccessFile(name, "rw"); |
| } catch (FileNotFoundException e) { |
| System.out.println("Unexpected exception " + e); |
| throw(e); |
| } |
| FileDescriptor fd = raf.getFD(); |
| |
| Field fdField = FileDescriptor.class.getDeclaredField("cleanup"); |
| fdField.setAccessible(true); |
| Cleaner.Cleanable cleanup = (Cleaner.Cleanable)fdField.get(fd); |
| |
| // Prepare to wait for FOS, FD, Cleanup to be reclaimed |
| ReferenceQueue<Object> queue = new ReferenceQueue<>(); |
| HashSet<Reference<?>> pending = new HashSet<>(3); |
| pending.add(new WeakReference<>(cleanup, queue)); |
| pending.add(new WeakReference<>(raf, queue)); |
| pending.add(new WeakReference<>(fd, queue)); |
| |
| Reference<?> r; |
| while (((r = queue.remove(10L)) != null) |
| || !pending.isEmpty()) { |
| System.out.printf("r: %s, pending: %d%n", r, pending.size()); |
| if (r != null) { |
| pending.remove(r); |
| } else { |
| cleanup = null; |
| raf = null; |
| fd = null; |
| System.gc(); // attempt to reclaim the RAF, cleanup, and fd |
| } |
| } |
| |
| // Keep these variables in scope as gc roots |
| Reference.reachabilityFence(cleanup); |
| Reference.reachabilityFence(fd); |
| Reference.reachabilityFence(raf); |
| Reference.reachabilityFence(pending); |
| |
| // Check the final count of open file descriptors |
| long fdCount = getFdCount(); |
| if (fdCount != fdCount0) { |
| System.out.printf("initial count of open file descriptors: %d%n", fdCount0); |
| System.out.printf("final count of open file descriptors: %d%n", fdCount); |
| FileUtils.listFileDescriptors(System.out); |
| } |
| } |
| |
| |
| // Get the count of open file descriptors, or -1 if not available |
| private static long getFdCount() { |
| OperatingSystemMXBean mxBean = ManagementFactory.getOperatingSystemMXBean(); |
| return (mxBean instanceof UnixOperatingSystemMXBean) |
| ? ((UnixOperatingSystemMXBean) mxBean).getOpenFileDescriptorCount() |
| : -1L; |
| } |
| } |