java.net.Socket.close does not throw IOException on second close

Name: yyC67448 Date: 09/30/97



The java.net.Socket.close() does not throw IOException when
closing already closed socket.

Here is the test demonstrating the bug:

-------------------------------- Test.java -----------------------------
import java.io.*;
import java.net.*;


class test
{

  public static void main(String args[])
  {
    InetAddress sin = null;
    Socket soc = null;
    int value = 0;


    /*
     * Try to get localhost address
     */
    try {
      sin = InetAddress.getLocalHost();
    } catch(Exception e)
    {
      System.out.println("Can not get localhost Address:" + e);
      System.exit(-1);
    }


    /*
     * Hope Telnet service enabled on localhost.
     */
    try {
      soc = new Socket(sin, 23, true);
    } catch(Exception e)
    {
      System.out.println("Can not create socket:" + e);
      System.exit(-1);
    }

    /*
     * Try to close socket
     */
    try {
      soc.close();
    } catch(Exception e)
    {
System.out.println("Can not close socket first time:" + e);
System.exit(-1);
    }

    /*
     * Try to close once more...
     */
    try {
      soc.close();
    } catch(IOException 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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