RES_STAYOPEN
_res.options |= RES_STAYOPEN; /* just keep this udp socket open */
{ "stayopen", RES_STAYOPEN },
(_res.options & RES_STAYOPEN) == 0) {
_res.options |= RES_STAYOPEN | RES_USEVC;
_res.options &= ~(RES_STAYOPEN | RES_USEVC);
case RES_STAYOPEN: return "styopn";
(statp->options & RES_STAYOPEN) == 0U) {