dev.h

用于motorala 68K系列处理器的小实时多任务操作系统 The OMU Kernel was written to provide a cut-down Unix-like O/S for a

/*
 * Structure of a device handler table entry.
 */

struct dev {
	int		inuse;			/* In use flag */
	int             (*openfnc)();
	int             (*closefnc)();
	int             (*stratfnc)();          /* Block devs only */
	int             (*rd_fnc)();            /* Char devs only */
	int             (*wr_fnc)();            /* Char devs only */
	int		(*sig_fnc)();		/* Signal device (interrupt) */
};

# define        NULLDEV         (( int (*)()) '\0')
# define        ioctlfnc        stratfnc

/*
 * Mention device switches.
 */

extern struct dev bdevsw[];
extern struct dev cdevsw[];