+ if not typ then
+ local addrinfo, err = getaddrinfo(address)
+ if not addrinfo then return nil, err end
+ if addrinfo[1] and addrinfo[1].family == "inet6" then
+ typ = "tcp6"
+ else
+ typ = "tcp"
+ end
+ end
+ local create = luasocket[typ]
+ if type( create ) ~= "function" then
+ err = "invalid socket type"
+ end
+