accept(integer(), binary(), binary(), term(), pid(), non_neg_integer()) ::
  {:ok, term()} | {:error, :system_error | :not_found}

accept_connect_request(integer()) ::
  {:ok, non_neg_integer()} | {:error, :system_error | :already_closed}

close(integer(), boolean(), non_neg_integer(), binary()) ::
  {:ok, non_neg_integer()} | {:error, :system_error | :already_closed}

destroy(integer()) :: :ok | {:error, :system_error | :already_closed}

dgram_send(integer(), binary()) ::
  {:ok, non_neg_integer()} | {:error, :system_error | :already_closed}

is_closed?(integer()) :: boolean()

on_packet(integer(), binary()) ::
  {:ok, non_neg_integer()} | {:error, :system_error | :already_closed}

on_timeout(integer()) ::
  {:ok, non_neg_integer()} | {:error, :system_error | :already_closed}

open_stream(integer(), boolean()) ::
  {:ok, non_neg_integer(), non_neg_integer()}
  | {:error, :system_error | :already_closed}

reject_connect_request(integer(), integer()) ::
  {:ok, non_neg_integer()} | {:error, :system_error | :already_closed}

stream_send(integer(), non_neg_integer(), binary(), boolean()) ::
  {:ok, non_neg_integer()} | {:error, :system_error | :already_closed}