int read_background(int start, int reading)
static int read_background(int start, int reading)
int read_background(int start, int reading){	if (cd->background)		return -1;	/* can't do twice */	outw(dc_normal | BACK_AHEAD, r_data_control);	if (!reading && start_read(start))		return -2;	cd->adapter_first = cd->adapter_last = start;	cd->background = 1;	/* flag a read is going on */	return 0;}