TS_ASYNC          769 kern/tty.c     			SET(tp->t_state, TS_ASYNC);
TS_ASYNC          771 kern/tty.c     			CLR(tp->t_state, TS_ASYNC);
TS_ASYNC         2000 kern/tty.c     	if (ISSET(tp->t_state, TS_ASYNC))
TS_ASYNC          321 net/ppp_tty.c  	if (tp->t_state & TS_ASYNC || flag & IO_NDELAY) {