res_search
int res_search(const char *, int, int, u_char *, int);
__weak_alias(res_search,_res_search)
status = res_search(host, C_IN, T_AAAA, answer, sizeof(answer));
status = res_search(host, C_IN, T_A, answer, sizeof(answer));
status = res_search(host, C_IN, T_MX, answer, sizeof(answer));