TS_TSTAMPDCDCLR
CLR(tp->t_flags, TS_TSTAMPDCDCLR);
SET(tp->t_flags, TS_TSTAMPDCDCLR);
ISSET(tp->t_flags, TS_TSTAMPDCDCLR);
if (tp->t_flags & (TS_TSTAMPDCDSET | TS_TSTAMPDCDCLR |
if (tp->t_flags & (TS_TSTAMPDCDSET | TS_TSTAMPDCDCLR |
if (tp->t_flags & (TS_TSTAMPDCDSET | TS_TSTAMPDCDCLR |