95 	size_t canon_head;  member
230 		n = ldata->canon_head - ldata->read_tail;  in chars_in_buffer()
256 	if (ldata->icanon && ldata->canon_head == ldata->read_tail)  in n_tty_check_throttle()
332 	ldata->read_head = ldata->canon_head = ldata->read_tail = 0;  in reset_buffer_flags()
966 	if (ldata->read_head == ldata->canon_head) {  in eraser()
976 			ldata->read_head = ldata->canon_head;  in eraser()
980 			ldata->read_head = ldata->canon_head;  in eraser()
992 	while (MASK(ldata->read_head) != MASK(ldata->canon_head)) {  in eraser()
1000 			 MASK(head) != MASK(ldata->canon_head));  in eraser()
1042 				while (MASK(tail) != MASK(ldata->canon_head)) {  in eraser()
1072 	if (ldata->read_head == ldata->canon_head && L_ECHO(tty))  in eraser()
1322 			size_t tail = ldata->canon_head;  in n_tty_receive_char_special()
1352 				if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_special()
1367 			smp_store_release(&ldata->canon_head, ldata->read_head);  in n_tty_receive_char_special()
1380 			if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_special()
1417 		if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char()
1697 			overflow = ldata->icanon && ldata->canon_head == tail;  in n_tty_receive_buf_common()
1769 			ldata->canon_head = ldata->read_tail;  in n_tty_set_termios()
1774 			ldata->canon_head = ldata->read_head;  in n_tty_set_termios()
1902 		return ldata->canon_head != ldata->read_tail;  in input_available_p()
1987 	size_t tail, canon_head;  in canon_copy_from_read_buf()  local
1994 	canon_head = smp_load_acquire(&ldata->canon_head);  in canon_copy_from_read_buf()
1995 	n = min(*nr, canon_head - ldata->read_tail);  in canon_copy_from_read_buf()
2041 	return ldata->read_tail != canon_head;  in canon_copy_from_read_buf()
2052 	size_t tail, canon_head;  in canon_skip_eof()  local
2054 	canon_head = smp_load_acquire(&ldata->canon_head);  in canon_skip_eof()
2058 	if (tail == canon_head)  in canon_skip_eof()
2450 	if (ldata->canon_head == ldata->read_tail)  in inq_canon()
2452 	head = ldata->canon_head;  in inq_canon()