MRT_INIT
if (setsockopt(s, IPPROTO_IP, MRT_INIT, &value, sizeof(value)) == -1)
if (optname != MRT_INIT &&
case MRT_INIT:
case MRT_INIT:
if (setsockopt(fd, IPPROTO_IP, MRT_INIT, &flag,
if (setsockopt(igmp_socket, IPPROTO_IP, MRT_INIT,
if (setsockopt(igmp_socket, IPPROTO_IP, MRT_INIT,