anchor.diff:  api_to_recvmsg_udp6(doc) ->
       [];
   api_to_recvmsg_udp6(_Config) when is_list(_Config) ->
  +    ?TT(?SECS(10)),
       tc_try(api_to_recvmsg_udp6,
              fun() -> has_support_ipv6() end,
              fun() ->
  -                   ?TT(?SECS(10)),
                      Recv = fun(Sock, To) -> socket:recvmsg(Sock, To) end,
                      InitState = #{domain  => inet6,
                                    recv    => Recv,
  
positive.code: sc_cpe_socket_cleanup_udp6(doc) ->
      [];
  sc_cpe_socket_cleanup_udp6(_Config) when is_list(_Config) ->
      tc_try(sc_cpe_socket_cleanup_udp6,
             fun() -> has_support_ipv6() end,
             fun() ->
                     ?TT(?SECS(5)),
                     InitState = #{domain   => inet6,
                                   type     => dgram,
                                   protocol => udp},
  
negative.code: api_to_recv_tcp4(doc) ->
      [];
  api_to_recv_tcp4(_Config) when is_list(_Config) ->
      ?TT(?SECS(10)),
      tc_try(api_to_recv_tcp4,
             fun() ->
                     Recv = fun(Sock, To) -> socket:recv(Sock, 0, To) end,
                     InitState = #{domain  => inet,
                                   recv    => Recv,
  