SC_EINTR_FLG
scp->sc_flgs &= ~(SC_CANCEL_FLG | SC_EINTR_FLG);
scp->sc_flgs |= SC_EINTR_FLG;
(scp->sc_flgs & (SC_CANCEL_FLG | SC_EINTR_FLG)) ==
(SC_CANCEL_FLG | SC_EINTR_FLG));
tdp->sc_flgs |= SC_EINTR_FLG;