addInput(socket, INPUT_READ) on WinXP

On Windows, when creating a TCPServer socket and calling addInput, i.e.

@srvSock = TCPServer.new("127.0.0.1", 7777)
addInput(srvSock, INPUT_READ, method(:gotCnx))

...

def gotCnx
    begin
      @socket = @srvSocket.accept_nonblock
    rescue Errno::EWOULDBLOCK
      puts "no call here?"
      @socket = nil
    end
end

the specified method (gotCnx) is called again and again, even if noone tries to make a connection (control flow enters rescue). On the net, I found something mentioning a mapping from fd to handle that is done by FXRuby, but maybe this doesn't work for sockets? (I found something about Windows sockets not having handles when not explicitly associated with one).