wsdisplay_addscreendata
struct wsdisplay_addscreendata gscr;
#define WSDISPLAYIO_ADDSCREEN _IOW('W', 83, struct wsdisplay_addscreendata)
#define WSDISPLAYIO_GETSCREEN _IOWR('W', 85, struct wsdisplay_addscreendata)
(struct wsdisplay_addscreendata *)data));
#define d ((struct wsdisplay_addscreendata *)data)
(struct wsdisplay_addscreendata *)data));
struct wsdisplay_addscreendata *);
struct wsdisplay_addscreendata *sd)
struct wsdisplay_addscreendata asd;