IP_HDRINCL
if (setsockopt(s, IPPROTO_IP, IP_HDRINCL,
case IP_HDRINCL:
if (setsockopt(fd, IPPROTO_IP, IP_HDRINCL, &hincl, sizeof(hincl)) == -1) {
#ifdef IP_HDRINCL
if (setsockopt(igmp_socket, IPPROTO_IP, IP_HDRINCL,
if (setsockopt(fd, IPPROTO_IP, IP_HDRINCL, &hincl, sizeof(hincl)) == -1) {
if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL,