getrrsetbyname
int getrrsetbyname(const char *, unsigned int, unsigned int, unsigned int, struct rrsetinfo **);
PROTO_DEPRECATED(getrrsetbyname);
rrset_errno = getrrsetbyname(host, C_IN, type, 0, &rrset);
ret = getrrsetbyname(name, C_IN, T_KEY, 0, &rr);
result = getrrsetbyname(hostname, DNS_RDATACLASS_IN,