# File lib/eventmachine.rb, line 1202
1202:         def EventMachine::open_keyboard handler=nil, *args
1203:                 klass = if (handler and handler.is_a?(Class))
1204:                   raise ArgumentError, 'must provide module or subclass of EventMachine::Connection' unless Connection > handler
1205:                         handler
1206:                 else
1207:                         Class.new( Connection ) {handler and include handler}
1208:                 end
1209: 
1210:                 arity = klass.instance_method(:initialize).arity
1211:                 expected = arity >= 0 ? arity : -(arity + 1)
1212:                 if (arity >= 0 and args.size != expected) or (arity < 0 and args.size < expected)
1213:                         raise ArgumentError, "wrong number of arguments for #{klass}#initialize (#{args.size} for #{expected})"
1214:                 end
1215: 
1216:                 s = read_keyboard
1217:                 c = klass.new s, *args
1218:                 @conns[s] = c
1219:                 block_given? and yield c
1220:                 c
1221:         end