SOCKET_OPTION_MULTICAST_LOOP  173 net/udp/udp_socket_libevent.h     SOCKET_OPTION_MULTICAST_LOOP = 1 << 2
SOCKET_OPTION_MULTICAST_LOOP  173 net/udp/udp_socket_win.h     SOCKET_OPTION_MULTICAST_LOOP = 1 << 2