author | chegar |
Tue, 19 Jun 2018 09:13:58 +0100 | |
branch | http-client-branch |
changeset 56771 | 73a6534bce94 |
parent 48737 | 7c12219870fd |
child 54770 | 62b6e7587b1f |
child 57308 | f22d38b23756 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2017, 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.management java.base/java.io:+open java.base/java.net:+open |
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* @run main/othervm UnreferencedSockets |
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* @run main/othervm -Djava.net.preferIPv4Stack=true UnreferencedSockets |
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* @summary Check that unreferenced sockets are closed |
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*/ |
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|
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import java.io.FileDescriptor; |
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import java.io.InputStream; |
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import java.io.OutputStream; |
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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.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.io.IOException; |
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import java.net.ServerSocket; |
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import java.net.Socket; |
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import java.net.SocketImpl; |
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import java.nio.file.Files; |
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import java.nio.file.Path; |
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import java.nio.file.Paths; |
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import java.util.ArrayDeque; |
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import java.util.List; |
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import java.util.Optional; |
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import java.util.concurrent.TimeUnit; |
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import com.sun.management.UnixOperatingSystemMXBean; |
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public class UnreferencedSockets { |
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/** |
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* The set of sockets we have to check up on. |
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*/ |
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final static ArrayDeque<NamedWeak> pendingSockets = new ArrayDeque<>(100); |
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/** |
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* Queued sockets when they are unreferenced. |
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*/ |
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final static ReferenceQueue<Object> pendingQueue = new ReferenceQueue<>(); |
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// Server to echo a stream |
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static class Server implements Runnable { |
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ServerSocket ss; |
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Server() throws IOException { |
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ss = new ServerSocket(0); |
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pendingSockets.add(new NamedWeak(ss, pendingQueue, "serverSocket")); |
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extractRefs(ss, "serverSocket"); |
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} |
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public int localPort() { |
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return ss.getLocalPort(); |
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} |
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public void run() { |
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try { |
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Socket s = ss.accept(); |
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pendingSockets.add(new NamedWeak(s, pendingQueue, "acceptedSocket")); |
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extractRefs(s, "acceptedSocket"); |
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InputStream in = s.getInputStream(); |
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int b = in.read(); |
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OutputStream out = s.getOutputStream(); |
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out.write(b); |
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// do NOT close but 'forget' the socket reference |
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out = null; |
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in = null; |
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s = null; |
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} catch (Exception ioe) { |
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ioe.printStackTrace(); |
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} finally { |
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try { |
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ss.close(); |
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ss = null; |
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} catch (IOException x) { |
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x.printStackTrace(); |
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} |
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} |
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} |
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} |
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public static void main(String args[]) throws Exception { |
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// Create and close a ServerSocket to warm up the FD count for side effects. |
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try (ServerSocket s = new ServerSocket(0)) { |
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// no-op; close immediately |
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s.getLocalPort(); // no-op |
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} |
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long fdCount0 = getFdCount(); |
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listProcFD(); |
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// start a server |
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Server svr = new Server(); |
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Thread thr = new Thread(svr); |
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thr.start(); |
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Socket s = new Socket("localhost", svr.localPort()); |
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pendingSockets.add(new NamedWeak(s, pendingQueue, "clientSocket")); |
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extractRefs(s, "clientSocket"); |
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OutputStream out = s.getOutputStream(); |
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130 |
out.write('x'); |
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|
131 |
out.flush(); |
7c12219870fd
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|
132 |
InputStream in = s.getInputStream(); |
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|
133 |
int b = in.read(); // wait for it back |
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|
134 |
System.out.printf(" data sent and received%n"); |
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|
135 |
// Do NOT close the Socket; forget it |
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|
136 |
|
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diff
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|
137 |
Object ref; |
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diff
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|
138 |
int loops = 20; |
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diff
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|
139 |
while (!pendingSockets.isEmpty() && loops-- > 0) { |
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|
140 |
ref = pendingQueue.remove(1000L); |
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diff
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|
141 |
if (ref != null) { |
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|
142 |
pendingSockets.remove(ref); |
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|
143 |
System.out.printf(" ref queued: %s, remaining: %d%n", ref, pendingSockets.size()); |
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|
144 |
} else { |
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|
145 |
s = null; |
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|
146 |
out = null; |
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|
147 |
in = null; |
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|
148 |
System.gc(); |
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diff
changeset
|
149 |
} |
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|
150 |
} |
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diff
changeset
|
151 |
|
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|
152 |
thr.join(); |
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|
153 |
|
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diff
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|
154 |
// List the open file descriptors |
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|
155 |
long fdCount = getFdCount(); |
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|
156 |
System.out.printf("Initial fdCount: %d, final fdCount: %d%n", fdCount0, fdCount); |
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|
157 |
listProcFD(); |
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diff
changeset
|
158 |
|
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rriggs
parents:
diff
changeset
|
159 |
if (loops == 0) { |
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diff
changeset
|
160 |
throw new AssertionError("Not all references reclaimed"); |
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|
161 |
} |
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|
162 |
} |
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diff
changeset
|
163 |
|
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diff
changeset
|
164 |
// Get the count of open file descriptors, or -1 if not available |
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|
165 |
private static long getFdCount() { |
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diff
changeset
|
166 |
OperatingSystemMXBean mxBean = ManagementFactory.getOperatingSystemMXBean(); |
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diff
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|
167 |
return (mxBean instanceof UnixOperatingSystemMXBean) |
7c12219870fd
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|
168 |
? ((UnixOperatingSystemMXBean) mxBean).getOpenFileDescriptorCount() |
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diff
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|
169 |
: -1L; |
7c12219870fd
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diff
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|
170 |
} |
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rriggs
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diff
changeset
|
171 |
|
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diff
changeset
|
172 |
// Reflect to find references in the socket implementation that will be gc'd |
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diff
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|
173 |
private static void extractRefs(Socket s, String name) { |
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diff
changeset
|
174 |
try { |
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rriggs
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diff
changeset
|
175 |
|
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rriggs
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diff
changeset
|
176 |
Field socketImplField = Socket.class.getDeclaredField("impl"); |
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rriggs
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diff
changeset
|
177 |
socketImplField.setAccessible(true); |
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rriggs
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diff
changeset
|
178 |
Object socketImpl = socketImplField.get(s); |
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rriggs
parents:
diff
changeset
|
179 |
|
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diff
changeset
|
180 |
Field fileDescriptorField = SocketImpl.class.getDeclaredField("fd"); |
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rriggs
parents:
diff
changeset
|
181 |
fileDescriptorField.setAccessible(true); |
7c12219870fd
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rriggs
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diff
changeset
|
182 |
FileDescriptor fileDescriptor = (FileDescriptor) fileDescriptorField.get(socketImpl); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
183 |
extractRefs(fileDescriptor, name); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
184 |
|
7c12219870fd
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rriggs
parents:
diff
changeset
|
185 |
Class<?> socketImplClass = socketImpl.getClass(); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
186 |
System.out.printf("socketImplClass: %s%n", socketImplClass); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
187 |
if (socketImplClass.getClass().getName().equals("java.net.TwoStacksPlainSocketImpl")) { |
7c12219870fd
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rriggs
parents:
diff
changeset
|
188 |
Field fileDescriptor1Field = socketImplClass.getDeclaredField("fd1"); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
189 |
fileDescriptor1Field.setAccessible(true); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
190 |
FileDescriptor fileDescriptor1 = (FileDescriptor) fileDescriptor1Field.get(socketImpl); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
191 |
extractRefs(fileDescriptor1, name + "::twoStacksFd1"); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
192 |
|
7c12219870fd
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rriggs
parents:
diff
changeset
|
193 |
} |
7c12219870fd
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rriggs
parents:
diff
changeset
|
194 |
} catch (NoSuchFieldException | IllegalAccessException ex) { |
7c12219870fd
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rriggs
parents:
diff
changeset
|
195 |
ex.printStackTrace(); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
196 |
throw new AssertionError("missing field", ex); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
197 |
} |
7c12219870fd
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rriggs
parents:
diff
changeset
|
198 |
} |
7c12219870fd
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rriggs
parents:
diff
changeset
|
199 |
|
7c12219870fd
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rriggs
parents:
diff
changeset
|
200 |
private static void extractRefs(FileDescriptor fileDescriptor, String name) { |
7c12219870fd
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rriggs
parents:
diff
changeset
|
201 |
Object cleanup = null; |
7c12219870fd
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rriggs
parents:
diff
changeset
|
202 |
int rawfd = -1; |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
203 |
try { |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
204 |
if (fileDescriptor != null) { |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
205 |
Field fd1Field = FileDescriptor.class.getDeclaredField("fd"); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
206 |
fd1Field.setAccessible(true); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
207 |
rawfd = fd1Field.getInt(fileDescriptor); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
208 |
|
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
209 |
Field cleanupfdField = FileDescriptor.class.getDeclaredField("cleanup"); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
210 |
cleanupfdField.setAccessible(true); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
211 |
cleanup = cleanupfdField.get(fileDescriptor); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
212 |
pendingSockets.add(new NamedWeak(fileDescriptor, pendingQueue, |
7c12219870fd
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rriggs
parents:
diff
changeset
|
213 |
name + "::fileDescriptor: " + rawfd)); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
214 |
pendingSockets.add(new NamedWeak(cleanup, pendingQueue, name + "::fdCleanup: " + rawfd)); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
215 |
|
7c12219870fd
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rriggs
parents:
diff
changeset
|
216 |
} |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
217 |
} catch (NoSuchFieldException | IllegalAccessException ex) { |
7c12219870fd
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rriggs
parents:
diff
changeset
|
218 |
ex.printStackTrace(); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
219 |
throw new AssertionError("missing field", ex); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
220 |
} finally { |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
221 |
System.out.print(String.format(" fd: %s, fd: %d, cleanup: %s%n", |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
222 |
fileDescriptor, rawfd, cleanup)); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
223 |
} |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
224 |
} |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
225 |
|
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
226 |
private static void extractRefs(ServerSocket s, String name) { |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
227 |
try { |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
228 |
|
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
229 |
Field socketImplField = ServerSocket.class.getDeclaredField("impl"); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
230 |
socketImplField.setAccessible(true); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
231 |
Object socketImpl = socketImplField.get(s); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
232 |
|
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
233 |
Field fileDescriptorField = SocketImpl.class.getDeclaredField("fd"); |
7c12219870fd
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rriggs
parents:
diff
changeset
|
234 |
fileDescriptorField.setAccessible(true); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
235 |
FileDescriptor fileDescriptor = (FileDescriptor) fileDescriptorField.get(socketImpl); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
236 |
|
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
237 |
Field fdField = FileDescriptor.class.getDeclaredField("fd"); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
238 |
fdField.setAccessible(true); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
239 |
int rawfd = fdField.getInt(fileDescriptor); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
240 |
|
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
241 |
Field cleanupField = FileDescriptor.class.getDeclaredField("cleanup"); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
242 |
cleanupField.setAccessible(true); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
243 |
Object cleanup = cleanupField.get(fileDescriptor); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
244 |
|
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
245 |
System.out.print(String.format(" fd: %s, fd: %d, cleanup: %s, socket: %s%n", |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
246 |
fileDescriptor, rawfd, cleanup, s)); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
247 |
|
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
248 |
pendingSockets.add(new NamedWeak(fileDescriptor, pendingQueue, |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
249 |
name + "::fileDescriptor: " + rawfd)); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
250 |
pendingSockets.add(new NamedWeak(cleanup, pendingQueue, name + "::fdCleanup: " + rawfd)); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
251 |
|
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
252 |
} catch (NoSuchFieldException | IllegalAccessException ex) { |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
253 |
ex.printStackTrace(); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
254 |
throw new AssertionError("missing field", ex); |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
255 |
} |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
256 |
} |
7c12219870fd
8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner
rriggs
parents:
diff
changeset
|
257 |
|
7c12219870fd
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rriggs
parents:
diff
changeset
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/** |
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* Method to list the open file descriptors (if supported by the 'lsof' command). |
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*/ |
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static void listProcFD() { |
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List<String> lsofDirs = List.of("/usr/bin", "/usr/sbin"); |
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Optional<Path> lsof = lsofDirs.stream() |
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.map(s -> Paths.get(s, "lsof")) |
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.filter(f -> Files.isExecutable(f)) |
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.findFirst(); |
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lsof.ifPresent(exe -> { |
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try { |
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System.out.printf("Open File Descriptors:%n"); |
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long pid = ProcessHandle.current().pid(); |
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ProcessBuilder pb = new ProcessBuilder(exe.toString(), "-p", Integer.toString((int) pid)); |
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pb.inheritIO(); |
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Process p = pb.start(); |
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p.waitFor(10, TimeUnit.SECONDS); |
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} catch (IOException | InterruptedException ie) { |
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ie.printStackTrace(); |
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} |
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}); |
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} |
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|
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// Simple class to identify which refs have been queued |
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static class NamedWeak extends WeakReference<Object> { |
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private final String name; |
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|
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NamedWeak(Object o, ReferenceQueue<Object> queue, String name) { |
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super(o, queue); |
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this.name = name; |
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} |
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|
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public String toString() { |
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return name + "; " + super.toString(); |
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} |
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} |
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} |