Sockets in python

[OneMustFall]

      Reciently i wrote a simple client (in twisted) using Reconnecting
Factory.
      That client logins to my socket server.. and that`s it.

      Interesting thing is that it is seems that twisted client,
      sends some ping on a TCP level without sending any data to the
      socket directly.
      Because when i pull out cord from the ethernet card simulating
      network falure, client in about 10-15 seconds determines that
      connection lost!! (pretty cool)
      While my server thinks that client is connected.
      I know that sockets ware designed to behave so.. to be tolarate
to
      network problems, but in my case this is bad.. i want it to
      behave like in twisted.

      I have searched in a socketmodule.c from python source code for a
      magic variables, but did not found anything that fits.

      I am using SO_KEEPALIVE on server - but documentations says
      it will only ping (and so timed outed) in a few hours.

      How do i make my server act the same way as twisted client?
      (to make some sort of a low level checking if a connections is
      broken without actualy sending anything to socket)

      The only suspicious lines intwisted is seems :

---------------------------------------------------------------------------
SO_UPDATE_ACCEPT_CONTEXT = 0x700B
SO_UPDATE_CONNECT_CONTEXT = 0x7010

--------------------------------------------------------------------------
            try:
                acc_sock.setsockopt(socket.SOL_SOCKET,
SO_UPDATE_ACCEPT_CONTEXT, struct.pack("I", handle))
            except socket.error, se:
                self.transport.acceptErr(ret, bytes)
            else:
                self.transport.acceptDone(acc_sock,
acc_sock.getpeername())

--------------------------------------------------------------------------
            if have_connectex:
                try:
                    sock.setsockopt(socket.SOL_SOCKET,
SO_UPDATE_CONNECT_CONTEXT, "")
                except socket.error, se:

self.transport.connectErr(failure.Failure(error.ConnectError()))
            self.transport.connectDone()
---------------------------------------------------------------------------

    I tried this all but it trows an exeption and not working and also
i have no i idea what
SO_UPDATE_ACCEPT_CONTEXT , andSO_UPDATE_CONNECT_CONTEXT  means.

Huh. Any Suggestions?