TF_GONE
#define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE)
if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) {
tp->t_flags |= TF_GONE;
{ TF_GONE, 'G' },
#define tty_gone(tp) ((tp)->t_flags & TF_GONE)
{ TF_GONE, 'G' },