sig
  type t =
      TCP_ESTABLISHED
    | TCP_SYN_SENT
    | TCP_SYN_RECV
    | TCP_FIN_WAIT1
    | TCP_FIN_WAIT2
    | TCP_TIME_WAIT
    | TCP_CLOSE
    | TCP_CLOSE_WAIT
    | TCP_LAST_ACK
    | TCP_LISTEN
    | TCP_CLOSING
    | TCP_MAX_STATES
  val to_int : Procfs.Net.Tcp_state.t -> int
  val of_int : int -> Procfs.Net.Tcp_state.t
end