typedef struct Cursor Cursor;typedef struct Cursorinfo Cursorinfo;struct Cursorinfo {	Cursor;	Lock;}; extern Cursorinfo	cursor;extern Cursor		arrow;extern Memimage		*gscreen;extern int		cursorver;extern Point		cursorpos; Point 		mousexy(void);int		cursoron(int);void		cursoroff(int);void		setcursor(Cursor*);void		flushmemscreen(Rectangle r);Rectangle	cursorrect(void);void		cursordraw(Memimage *dst, Rectangle r); void		drawactive(int);void		drawlock(void);void		drawunlock(void);int		candrawlock(void);void		getcolor(ulong, ulong*, ulong*, ulong*);int		setcolor(ulong, ulong, ulong, ulong);#define		TK2SEC(x)	0extern void	blankscreen(int);void		screeninit(int x, int y, char *chanstr);void		mousetrack(int x, int y, int b, int msec);uchar		*attachscreen(Rectangle*, ulong*, int*, int*, int*); void		fsinit(char *mntpt, int x, int y, char *chanstr);