serial_ttystate old_ttystate);
extern int ser_base_setbaudrate (struct serial *scb, int rate);
extern int ser_base_setstopbits (struct serial *scb, int num);
+extern int ser_base_setparity (struct serial *scb, int parity);
extern int ser_base_drain_output (struct serial *scb);
extern int ser_base_write (struct serial *scb, const void *buf, size_t count);