Name: yyC67448 Date: 09/15/98




The java.net.DatagramSocket.setReceiveBufferSize(int size) method does not
throw IllegalArgumentException if size = 0;

Here is the javadoc comment for this method:

---------------------------------

    /**
     * Sets the SO_RCVBUF option to the specified value for this
     * DatagramSocket. The SO_RCVBUF option is used by the platform's
     * networking code as a hint for the size to use to allocate set
     * the underlying network I/O buffers.
     *
     * <p>Increasing buffer size can increase the performance of
     * network I/O for high-volume connection, while decreasing it can
     * help reduce the backlog of incoming data. For UDP, this sets
     * the maximum size of a packet that may be sent on this socket.
     *
     * <p>Because SO_RCVBUF is a hint, applications that want to
     * verify what size the buffers were set to should call
     * <href="#getReceiveBufferSize>getReceiveBufferSize</a>.
     *
     * @param size the size to which to set the receive buffer
     * size. This value must be greater than 0.
     *
     * @exception IllegalArgumentException if the value is 0 or is
     * negative.
     */

---------------------------------


Here is the test demonstrating the bug:

---------------------------- test.java --------------------------------
import java.net.*;


class test
{

  public static void main(String args[])
  {
     DatagramSocket soc = null;
     
     try {
       soc = new DatagramSocket();
     } catch(Exception e)
     {
         System.out.println("Unexpected exception:" + e);
         System.exit(-1);
     }

     try {
        soc.setReceiveBufferSize(0);
     } catch(IllegalArgumentException e)
     {
System.out.println("OKAY");
System.exit(0);
     } catch(Exception e)
     {
System.out.println("Unexpected exception:" + e);
System.exit(-1);
     }

     System.out.println("No exceptions.");
      
  }
}



---------------------- Output from the test -----------------
No exceptions.
-----------------------------------------------------------------


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