int serial_open(const char *pathname, int flags);
int serial_close(int fd);
int serial_flush(int fd);
+int serial_write(int fd, const void *buf, size_t count);
+int serial_read(int fd, void *buf, size_t count);
void *serial_backup_params(int fd);
void serial_restore_params(int fd, void *backup);
int serial_set_params(int fd, int speed, int bits, int parity, int stopbits,