[kaffe] Bug Report: multiple sockets can't bind to same multicast address

[Everton da Silva Marques]

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Hi,

Kaffe (1.1.1 and 1.1.2) does not allow multiple multicast
sockets to bind to the same address/port pair.

I have attached a small test program which shows the issue.
The output from the test program is:

// Correct output:
/usr/local/j2sdk1.4.2_01/bin/java -classpath build mcast.MulticastListener
FIRST multicast socket bound to 224.0.0.9:1234
FIRST multicast socket joined 224.0.0.9 on interface 0.0.0.0
SECOND multicast socket bound to 224.0.0.9:1234
SECOND multicast socket joined 224.0.0.9 on interface 0.0.0.0

// Output under Kaffe 1.1.1 and 1.1.2:
/usr/local/kaffe-1.1.2/bin/java -classpath build mcast.MulticastListener
FIRST multicast socket bound to 224.0.0.9:1234
FIRST multicast socket joined 224.0.0.9 on interface 108.103.35.8
could not create SECOND multicast socket: java.net.BindException: Address already in use

Is this known?

Thanks,
Everton


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package mcast;

import java.io.IOException;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.DatagramPacket;
import java.net.MulticastSocket;
import java.net.UnknownHostException;

class MulticastListener {

    private static final String mcastAddr = "224.0.0.9";
    private static final int    mcastPort = 1234;

    private static void go() {

	//
	// Multicast Address
	//

	InetAddress multicastAddress;
        try {
	    multicastAddress = InetAddress.getByName(mcastAddr);
        }
        catch (UnknownHostException e) {
            System.err.println("could not solve multicast address: " + e);
            return;
        }

	//
	// First Socket
	//

	MulticastSocket firstMcastSock;
	try {
            firstMcastSock = new MulticastSocket(mcastPort);
	}
	catch (Exception e) {
            System.err.println("could not create FIRST multicast socket: " + e);
            return;
	}

	System.out.println("FIRST multicast socket bound to " + mcastAddr + ":" + mcastPort);

	try {
	    firstMcastSock.joinGroup(multicastAddress);
	}
	catch (IOException e) {
            System.err.println("could not join FIRST socket to multicast group: " + e);
            return;
	}

	try {
	    System.out.println("FIRST multicast socket joined " + mcastAddr + " on interface " + firstMcastSock.getInterface().getHostName());
	}
	catch (SocketException e) {
	    System.err.println("could not get interface for FIRST multicast socket");
	}

	//
	// Second Socket
	//

	MulticastSocket secondMcastSock;
	try {
            secondMcastSock = new MulticastSocket(mcastPort);
	}
	catch (Exception e) {
            System.err.println("could not create SECOND multicast socket: " + e);
            return;
	}

	System.out.println("SECOND multicast socket bound to " + mcastAddr + ":" + mcastPort);

	try {
	    secondMcastSock.joinGroup(multicastAddress);
	}
	catch (IOException e) {
            System.err.println("could not join SECOND socket to multicast group: " + e);
            return;
	}

	try {
	    System.out.println("SECOND multicast socket joined " + mcastAddr + " on interface " + secondMcastSock.getInterface().getHostName());
	}
	catch (SocketException e) {
	    System.err.println("could not get interface for SECOND multicast socket");
	}

    }

    public static void main(String args[]) {
	go();
    }
}

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