SR_PRIV int serial_read(int fd, void *buf, size_t count);
SR_PRIV void *serial_backup_params(int fd);
SR_PRIV void serial_restore_params(int fd, void *backup);
SR_PRIV int serial_read(int fd, void *buf, size_t count);
SR_PRIV void *serial_backup_params(int fd);
SR_PRIV void serial_restore_params(int fd, void *backup);