extern int ser_base_flush_output (struct serial *scb);
extern int ser_base_flush_input (struct serial *scb);
extern int ser_base_send_break (struct serial *scb);
extern void ser_base_raw (struct serial *scb);
extern serial_ttystate ser_base_get_tty_state (struct serial *scb);
extern int ser_base_flush_output (struct serial *scb);
extern int ser_base_flush_input (struct serial *scb);
extern int ser_base_send_break (struct serial *scb);
extern void ser_base_raw (struct serial *scb);
extern serial_ttystate ser_base_get_tty_state (struct serial *scb);