TCTRL_SEND_REQUEST
if ((v == 0) && ((sc->sc_flags & TCTRL_SEND_REQUEST) == 0 ||
sc->sc_flags & TCTRL_SEND_REQUEST) {
if (sc->sc_flags & TCTRL_SEND_REQUEST) {
sc->sc_flags &= ~TCTRL_SEND_REQUEST;
sc->sc_flags |= TCTRL_SEND_REQUEST;