val tcp_set_keepalive_params : Unix.file_descr -> int -> int -> int -> unitval enable_keepalive : fd:Lwt_unix.file_descr -> after:Duration.t -> interval:Duration.t -> probes:int -> unitTcp_socket_optionsval tcp_set_keepalive_params : Unix.file_descr -> int -> int -> int -> unitval enable_keepalive : fd:Lwt_unix.file_descr -> after:Duration.t -> interval:Duration.t -> probes:int -> unit