uv__setsockopt_maybe_char  578 src/unix/udp.c   return uv__setsockopt_maybe_char(handle, IP_MULTICAST_TTL, ttl);
uv__setsockopt_maybe_char  583 src/unix/udp.c   return uv__setsockopt_maybe_char(handle, IP_MULTICAST_LOOP, on);