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