res_query_async
struct asr_query *res_query_async(const char *, int, int, void *);
as = res_query_async(name, class, type, NULL);
DEF_WEAK(res_query_async);
PROTO_NORMAL(res_query_async);
if ((aq = res_query_async("ipv4only.arpa.", LDNS_RR_CLASS_IN,
if ((aq = res_query_async(name, rrclass, rrtype, res->asr_ctx))
as = res_query_async(s->name, C_IN, T_MX, NULL);
as = res_query_async(domain, C_IN, T_MX, NULL);
(q = res_query_async(dname, class, type, NULL)) &&
as = res_query_async(record, C_IN, type, NULL);