# File lib/eventmachine.rb, line 540
540:   def self.start_server server, port=nil, handler=nil, *args, &block
541:     begin
542:       port = Integer(port)
543:     rescue ArgumentError, TypeError
544:       # there was no port, so server must be a unix domain socket
545:       # the port argument is actually the handler, and the handler is one of the args
546:       args.unshift handler if handler
547:       handler = port
548:       port = nil
549:     end if port
550: 
551:     klass = if (handler and handler.is_a?(Class))
552:       raise ArgumentError, 'must provide module or subclass of EventMachine::Connection' unless Connection > handler
553:       handler
554:     else
555:       Class.new( Connection ) {handler and include handler}
556:     end
557: 
558:     arity = klass.instance_method(:initialize).arity
559:     expected = arity >= 0 ? arity : -(arity + 1)
560:     if (arity >= 0 and args.size != expected) or (arity < 0 and args.size < expected)
561:       raise ArgumentError, "wrong number of arguments for #{klass}#initialize (#{args.size} for #{expected})" 
562:     end
563: 
564:     s = if port
565:           start_tcp_server server, port
566:         else
567:           start_unix_server server
568:         end
569:     @acceptors[s] = [klass,args,block]
570:     s
571:   end