/* Constants */enum {	/* Dirs */	FsRoot,	FsDDraw,	FsDDrawn,	FsDWsys,	FsDWsysn, 	/* Files */	/*	Keyboard */	FsFCons,	FsFConsctl,	/*	Mouse */	FsFCursor,	FsFMouse,	FsFSnarf,	/*	Window */	FsFKill,	FsFLabel,	FsFWctl,	FsFWinid,	FsFWinname,	/*	draw/ */	FsFNew,	/*	draw/n/ */	FsFCtl,	FsFData,	FsFColormap,	FsFRefresh,}; /* Read response */typedef struct IOResponse IOResponse;struct IOResponse{	char * data;	int count;	const char *err;}; /* Error messages */const char	*Ebadarg,	*Edeleted,	*Einterrupted,	*Einuse,	*Enodev,	*Enofile,	*Enodrawimage,	*Enomem,	*Enoperm,	*Eshortread; /* Macros */#define incref(r)	((*r) = ++(*r))#define decref(r)	((*r) = --(*r))#define iswindow(t) ((t) == FsRoot || (t) > FsDDrawn && (t) < FsFCtl) /* * TODO: These functions should be standard device * file functions taken directly from Inferno devices. */ /* Devdraw */const char* drawopen(Client*, uint);Client* drawnewclient(Draw*);Window* drawwindow(Client*);int drawclientid(Client*);IOResponse drawread(Client*, int, char*, int);IOResponse drawwrite(Client*, int, char*, int);void drawclose(Client*, int);