91 lines
2.9 KiB
Java
91 lines
2.9 KiB
Java
/*
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* Copyright 2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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/*
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* @test
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* @summary configuring unconnected Socket before passing to implAccept can cause fd leak
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* @bug 6368984
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* @author Edward Wang
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*/
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import java.io.*;
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import java.net.*;
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public class AcceptCauseFileDescriptorLeak {
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private static final int REPS = 1000;
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public static void main(String[] args) throws Exception {
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final ServerSocket ss = new ServerSocket(0) {
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public Socket accept() throws IOException {
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Socket s = new Socket() { };
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s.setSoTimeout(10000);
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implAccept(s);
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return s;
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}
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};
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Thread t = new Thread(new Runnable() {
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public void run() {
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try {
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for (int i = 0; i < REPS; i++) {
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(new Socket("localhost", ss.getLocalPort())).close();
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}
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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});
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t.start();
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for (int i = 0; i < REPS; i++) {
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ss.accept().close();
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}
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ss.close();
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t.join();
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//
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// The threshold 20 below is a little arbitrary. The point here is that
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// the remaining open file descriptors should be constant independent
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// of REPS.
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//
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if (countOpenFD() > 20) {
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throw new RuntimeException("File descriptor leak detected.");
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}
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}
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/*
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* Actually, this approach to count open file descriptors only
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* works for Solaris/Linux. On Windows platform, this method
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* will simply return zero. So the test will always be passed
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* on Windows, too.
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*/
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private static int countOpenFD() {
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File dirOfFD = new File("/proc/self/fd");
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File[] fds = dirOfFD.listFiles();
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if (fds != null)
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return fds.length;
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else
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return 0;
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}
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}
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