module Dns:sig..end
libuv provides asynchronous variants of getaddrinfo and getnameinfo.
val getaddrinfo : host:string ->
service:string ->
getaddrinfo_option list -> Unix.addr_info list uv_result Lwt.tAsynchronous getaddrinfo(3).
Either node or service may be NULL but not both.
Be careful: Uwt.Dns.getaddrinfo returns raw error codes,
whereas Unix.getaddrinfo returns the empty list
typegetnameinfo_option =Unix.getnameinfo_option
val getnameinfo : sockaddr -> getnameinfo_option list -> Unix.name_info uv_result Lwt.tAsynchronous getnameinfo(3).