TF_EXCLUDE
tp->t_flags |= TF_EXCLUDE;
tp->t_flags &= ~TF_EXCLUDE;
{ TF_EXCLUDE, 'X' },
if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) {
tp->t_flags &= ~TF_EXCLUDE;
{ TF_EXCLUDE, 'X' },