234 lines
8.0 KiB
Java
234 lines
8.0 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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/**
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*
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* @test
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* @modules java.base/java.io:open
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* @library /test/lib
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* @build jdk.test.lib.util.FileUtils UnreferencedFOSClosesFd
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* @bug 6524062
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* @summary Test to ensure that the fd is closed if left unreferenced
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* @run main/othervm UnreferencedFOSClosesFd
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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.FileOutputStream;
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import java.io.IOException;
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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.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 java.util.concurrent.atomic.AtomicInteger;
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import com.sun.management.UnixOperatingSystemMXBean;
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import jdk.test.lib.util.FileUtils;
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public class UnreferencedFOSClosesFd {
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static final String FILE_NAME = "empty.txt";
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/**
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* Subclass w/ no overrides; not close.
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* Cleanup should be via the Cleaner.
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*/
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public static class StreamOverrides extends FileOutputStream {
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protected final AtomicInteger closeCounter;
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public StreamOverrides(String name) throws FileNotFoundException {
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super(name);
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closeCounter = new AtomicInteger(0);
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}
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final AtomicInteger closeCounter() {
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return closeCounter;
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}
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}
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/**
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* Subclass overrides close.
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* Cleanup should be via AltFinalizer calling close().
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*/
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public static class StreamOverridesClose extends StreamOverrides {
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public StreamOverridesClose(String name) throws FileNotFoundException {
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super(name);
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}
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public void close() throws IOException {
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closeCounter.incrementAndGet();
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super.close();
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}
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}
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/**
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* Subclass overrides finalize and close.
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* Cleanup should be via the Cleaner.
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*/
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public static class StreamOverridesFinalize extends StreamOverrides {
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public StreamOverridesFinalize(String name) throws FileNotFoundException {
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super(name);
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}
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@SuppressWarnings({"deprecation","removal"})
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protected void finalize() throws IOException, Throwable {
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super.finalize();
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}
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}
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/**
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* Subclass overrides finalize and close.
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* Cleanup should be via the Cleaner.
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*/
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public static class StreamOverridesFinalizeClose extends StreamOverridesClose {
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public StreamOverridesFinalizeClose(String name) throws FileNotFoundException {
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super(name);
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}
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@SuppressWarnings({"deprecation","removal"})
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protected void finalize() throws IOException, Throwable {
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super.finalize();
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}
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}
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/**
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* Main runs each test case and reports number of failures.
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*/
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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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String name = inFile.getPath();
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FileUtils.listFileDescriptors(System.out);
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long fdCount0 = getFdCount();
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int failCount = 0;
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failCount += test(new FileOutputStream(name));
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failCount += test(new StreamOverrides(name));
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failCount += test(new StreamOverridesClose(name));
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failCount += test(new StreamOverridesFinalize(name));
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failCount += test(new StreamOverridesFinalizeClose(name));
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if (failCount > 0) {
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throw new AssertionError("Failed test count: " + failCount);
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}
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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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private static int test(FileOutputStream fos) throws Exception {
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try {
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System.out.printf("%nTesting %s%n", fos.getClass().getName());
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// Prepare to wait for FOS to be reclaimed
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ReferenceQueue<Object> queue = new ReferenceQueue<>();
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HashSet<Reference<?>> pending = new HashSet<>();
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WeakReference<FileOutputStream> msWeak = new WeakReference<>(fos, queue);
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pending.add(msWeak);
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FileDescriptor fd = fos.getFD();
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WeakReference<FileDescriptor> fdWeak = new WeakReference<>(fd, queue);
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pending.add(fdWeak);
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Field fdField = FileDescriptor.class.getDeclaredField("fd");
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fdField.setAccessible(true);
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int ffd = fdField.getInt(fd);
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Field cleanupField = FileDescriptor.class.getDeclaredField("cleanup");
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cleanupField.setAccessible(true);
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Object cleanup = cleanupField.get(fd);
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System.out.printf(" cleanup: %s, ffd: %d, cf: %s%n", cleanup, ffd, cleanupField);
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if (cleanup == null) {
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throw new RuntimeException("cleanup should not be null");
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}
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WeakReference<Object> cleanupWeak = new WeakReference<>(cleanup, queue);
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pending.add(cleanupWeak);
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System.out.printf(" fdWeak: %s%n msWeak: %s%n cleanupWeak: %s%n",
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fdWeak, msWeak, cleanupWeak);
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AtomicInteger closeCounter = fos instanceof StreamOverrides
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? ((StreamOverrides) fos).closeCounter() : null;
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Reference<?> r;
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while (((r = queue.remove(1000L)) != null)
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|| !pending.isEmpty()) {
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System.out.printf(" r: %s, pending: %d%n",
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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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fos = null;
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fd = null;
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cleanup = null;
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System.gc(); // attempt to reclaim them
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}
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}
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Reference.reachabilityFence(fd);
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Reference.reachabilityFence(fos);
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Reference.reachabilityFence(cleanup);
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// Confirm the correct number of calls to close depending on the cleanup type
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if (closeCounter != null && closeCounter.get() > 0) {
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throw new RuntimeException("Close should not have been called: count: " + closeCounter);
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}
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} catch (Exception ex) {
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ex.printStackTrace(System.out);
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return 1;
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}
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return 0;
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}
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}
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