int (*noflush_set_tty_state) (serial_t, serial_ttystate, serial_ttystate);
int (*setbaudrate) (serial_t, int rate);
int (*setstopbits) (serial_t, int num);
int (*noflush_set_tty_state) (serial_t, serial_ttystate, serial_ttystate);
int (*setbaudrate) (serial_t, int rate);
int (*setstopbits) (serial_t, int num);