MCAST_JOIN_GROUP
|| option == MCAST_JOIN_GROUP
if (option == MCAST_LEAVE_GROUP || option == MCAST_JOIN_GROUP) {
case MCAST_JOIN_GROUP:
SOCKET_OPTION_INFO_ENTRY(IPPROTO_IP, MCAST_JOIN_GROUP),
if (setsockopt(fd, level, MCAST_JOIN_GROUP, &gr, sizeof(gr)) < 0)
#ifndef MCAST_JOIN_GROUP