RES_USEVC
{ "usevc", RES_USEVC },
ctx->res_state.options |= RES_USEVC;
v_circuit = (_res.options & RES_USEVC) || buflen > PACKETSZ;
((_res.options & RES_USEVC) == 0 || ns != 0)) ||
_res.options |= RES_STAYOPEN | RES_USEVC;
_res.options &= ~(RES_STAYOPEN | RES_USEVC);
case RES_USEVC: return "usevc";
v_circuit = (statp->options & RES_USEVC) || buflen > PACKETSZ;
if ((v_circuit && (statp->options & RES_USEVC) == 0U) ||
if (newmsglen > PACKETSZ || nstatp->options & RES_USEVC)
nstatp->options |= RES_USEVC;