1 /*

     2  * Copyright 2001 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug 4431020

    27  * @summary On Windows 2000 we observed behaviour that reflects the underlying

    28  * implementation :-

    29  *   1. PortUnreachableException throw per underlying reset

    30  *   2. No PUE throw for DatagramSocket.send

    31  */

    32 import java.net.*;

    33 

    34 public class Concurrent implements Runnable {

    35 

    36     DatagramSocket s;

    37 

    38     public void run() {

    39         try {

    40             byte b[] = new byte[512];

    41             DatagramPacket p = new DatagramPacket(b, b.length);

    42 

    43             int pue_count = 0;

    44             while (true) {

    45                 try {

    46                     System.out.println("receive...");

    47                     s.receive(p);

    48                 } catch (PortUnreachableException pue) {

    49                     System.out.println("receive threw PortUnreachableException");

    50                     pue_count++;

    51                 }

    52                 System.out.println("receiver sleeping");

    53                 Thread.currentThread().sleep(100*pue_count);

    54             }

    55 

    56         } catch (Exception e) { }

    57     }

    58 

    59     Concurrent(InetAddress ia, int port) throws Exception {

    60 

    61         System.out.println("");

    62         System.out.println("***");

    63         System.out.println("Test Description:");

    64         System.out.println("    - Block reader thread on receive");

    65         System.out.println("    - Send datagrams to bad destination with wee pauses");

    66         System.out.println("    - Observe which thread gets the PUE");

    67         System.out.println("");

    68 

    69         /*

    70          * Create the datagram and connect it to destination

    71          */

    72         s = new DatagramSocket();

    73         s.connect(ia, port);

    74         s.setSoTimeout(60000);

    75 

    76         /*

    77          * Start the reader thread

    78          */

    79         Thread thr = new Thread(this);

    80         thr.start();

    81         Thread.currentThread().sleep(2000);

    82 

    83         byte b[] = new byte[512];

    84         DatagramPacket p = new DatagramPacket(b, b.length);

    85 

    86         /*

    87          * Send a bunch of packets to the destination

    88          */

    89         for (int i=0; i<10; i++) {

    90             try {

    91                 System.out.println("Sending...");

    92                 s.send(p);

    93             } catch (PortUnreachableException e) {

    94                 System.out.println("send threw PortUnreachableException");

    95             }

    96             Thread.currentThread().sleep(100);

    97         }

    98 

    99         /*

   100          * Give time for ICMP port unreachables to return

   101          */

   102         Thread.currentThread().sleep(5000);

   103 

   104         s.close();

   105     }

   106 

   107 

   108     public static void main(String args[]) throws Exception {

   109 

   110         InetAddress ia;

   111         int port;

   112         if (args.length >= 2) {

   113             ia = InetAddress.getByName(args[0]);

   114             port = Integer.parseInt(args[1]);

   115         } else {

   116             ia = InetAddress.getLocalHost();

   117             DatagramSocket s1 = new DatagramSocket();

   118             port = s1.getLocalPort();

   119             s1.close();

   120         }

   121 

   122         new Concurrent(ia, port);

   123     }

   124 

   125 }