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