🚀 go-pugleaf

Hi,

I'm having a bit of trouble reliably detecting when a socket has been
disconnected from the other end. I've seen various opinions around the place
that a read or write should result in an exception when this has happened,
but the code below fails to produce one (at least on my system which is,
gack, w95).

I'm a bit stumped on what to do with this as there seems to be /no/ reliable
method for detecting this condition.

import java.net.*;
import java.io.IOException;
import java.util.Date;

public class SocketTest implements Runnable{

  public void run(){
    ServerSocket ss = null;
    try {
      ss = new ServerSocket(6666);

      Socket s = ss.accept();

      //disconnect immediately
      s.shutdownInput();
      s.shutdownOutput();
      s.close();
      s = null;
      System.err.println(new Date().toString() +  ": Shut Socket");
    }
    catch (IOException ex) {
      ex.printStackTrace();
    }
    finally {
      if(ss!=null){
        try{
          ss.close();
          System.err.println(new Date().toString() +  ": Shut Server");
        }
        catch(IOException ex){
          ex.printStackTrace();
        }
      }
    }
  }

  public static void main(String[] args) {
    new Thread(new SocketTest()).start();

    try{
      Socket s = new Socket("127.0.0.1",6666);

      try{
        Thread.sleep(5000);
      }catch(InterruptedException ie){
        ie.printStackTrace();
      }

      //will return -1 (indicating that there's nothing to read),
      //BUT won't throw exception even though socket is defunct
      System.err.println(s.getInputStream().read());
    }catch(IOException ex){
      ex.printStackTrace();
    }
  }
}