RES_DEFNAMES
#define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
ac->ac_options = RES_RECURSE | RES_DEFNAMES | RES_DNSRCH;
PRINTOPT(RES_DEFNAMES, "DEFNAMES");
as->as_ctx->ac_options & RES_DEFNAMES &&
{ "DEFNAMES", RES_DEFNAMES },