anchor.diff:           sc_rs_recv_send_shutdown_receive_tcpL/1,
            sc_rs_recvmsg_send_shutdown_receive_tcp4/1,
            sc_rs_recvmsg_send_shutdown_receive_tcp6/1,
  +         sc_rs_recvmsg_send_shutdown_receive_tcpL/1,
   
            %% *** Traffic ***
            traffic_send_and_recv_chunks_tcp4/1,
  
positive.code:                                        end
                                 end,
                     Send      = fun(Sock, Data) when is_binary(Data) ->
                                    MsgHdr = #{iov => [Data]},
                                    socket:sendmsg(Sock, MsgHdr)
                                 end,
                     InitState = #{domain => inet6,
                                   proto  => tcp,
                                   recv   => Recv,
                                   send   => Send,
                                   data   => MsgData},
  
negative.code: %% don't clash.
  mk_unique_path() ->
      [NodeName | _] = string:tokens(atom_to_list(node()), [$@]),
      %% ?LIB:f("/tmp/socket_~s_~w", [NodeName, erlang:unique_integer()]).
      ?LIB:f("/tmp/socket_~s_~w", [NodeName, erlang:system_time(nanosecond)]).
  
  which_local_socket_addr(local = Domain) ->
      #{family => Domain,
  