struct parport_config {	int num;	unsigned long ppbase;	unsigned char real;	unsigned short usb_vid;	unsigned short usb_pid;	int (*open) (int num);	void (*close) (int handle);	int (*transfer) (WD_TRANSFER *tr, int fd, unsigned int request, int ppbase, int ecpbase, int num);};struct parport_config __attribute__ ((visibility ("hidden"))) *config_get(int num);unsigned char __attribute__ ((visibility ("hidden"))) config_is_real_pport(int num);unsigned short __attribute__ ((visibility ("hidden"))) config_usb_vid(int num);unsigned short __attribute__ ((visibility ("hidden"))) config_usb_pid(int num);