94 	size_t canon_head;  member
227 		n = ldata->canon_head - ldata->read_tail;  in chars_in_buffer()
255 	if (ldata->icanon && ldata->canon_head == ldata->read_tail)  in n_tty_check_throttle()
331 	ldata->read_head = ldata->canon_head = ldata->read_tail = 0;  in reset_buffer_flags()
982 	if (ldata->read_head == ldata->canon_head) {  in eraser()
992 			ldata->read_head = ldata->canon_head;  in eraser()
996 			ldata->read_head = ldata->canon_head;  in eraser()
1008 	while (MASK(ldata->read_head) != MASK(ldata->canon_head)) {  in eraser()
1016 			 MASK(head) != MASK(ldata->canon_head));  in eraser()
1058 				while (MASK(tail) != MASK(ldata->canon_head)) {  in eraser()
1088 	if (ldata->read_head == ldata->canon_head && L_ECHO(tty))  in eraser()
1328 			size_t tail = ldata->canon_head;  in n_tty_receive_char_special()
1358 				if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_special()
1373 			smp_store_release(&ldata->canon_head, ldata->read_head);  in n_tty_receive_char_special()
1386 			if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_special()
1413 		if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_inline()
1441 		if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_fast()
1723 			overflow = ldata->icanon && ldata->canon_head == tail;  in n_tty_receive_buf_common()
1797 			ldata->canon_head = ldata->read_tail;  in n_tty_set_termios()
1802 			ldata->canon_head = ldata->read_head;  in n_tty_set_termios()
1932 		return ldata->canon_head != ldata->read_tail;  in input_available_p()
2019 	size_t tail, canon_head;  in canon_copy_from_read_buf()  local
2026 	canon_head = smp_load_acquire(&ldata->canon_head);  in canon_copy_from_read_buf()
2027 	n = min(*nr, canon_head - ldata->read_tail);  in canon_copy_from_read_buf()
2073 	return ldata->read_tail != canon_head;  in canon_copy_from_read_buf()
2084 	size_t tail, canon_head;  in canon_skip_eof()  local
2086 	canon_head = smp_load_acquire(&ldata->canon_head);  in canon_skip_eof()
2090 	if (tail == canon_head)  in canon_skip_eof()
2483 	if (ldata->canon_head == ldata->read_tail)  in inq_canon()
2485 	head = ldata->canon_head;  in inq_canon()