HelenOS sources

DNS_NAME_MAX_SIZE  180 uspace/srv/net/dnsrsrv/dns_msg.c 	bsize = min(pdu->size - boff, DNS_NAME_MAX_SIZE);
DNS_NAME_MAX_SIZE   98 uspace/srv/net/dnsrsrv/dnsrsrv.c 	    DNS_NAME_MAX_SIZE, 0, NULL);
HelenOS homepage, sources at GitHub