RES_F_VC
statp->_flags &= ~(RES_F_VC | RES_F_CONN);
if (statp->_vcsock >= 0 && (statp->_flags & RES_F_VC) != 0) {
statp->_flags &= ~RES_F_VC;
if (statp->_vcsock < 0 || (statp->_flags & RES_F_VC) == 0) {
statp->_flags |= RES_F_VC;