C++ (Cpp) get_usb_nr示例

示例#1

文件： sa_wrap.c 项目： Embedded-linux/sysstat

/*
 ***************************************************************************
 * Count number of USB devices plugged into the system.
 *
 * IN:
 * @a	Activity structure.
 *
 * RETURNS:
 * Number of USB devices + a pre-allocation constant.
 ***************************************************************************
 */
__nr_t wrap_get_usb_nr(struct activity *a)
{
	__nr_t n = 0;

	if ((n = get_usb_nr()) >= 0)
		/* Return a positive number even if no USB devices have been found */
		return n + NR_USB_PREALLOC;

	return 0;
}

示例#2

/*
 ***************************************************************************
 * Count number of USB devices plugged into the system.
 *
 * IN:
 * @a	Activity structure.
 *
 * RETURNS:
 * Number of USB devices + a pre-allocation constant. Number cannot exceed
 * MAX_NR_USB.
 ***************************************************************************
 */
__nr_t wrap_get_usb_nr(struct activity *a)
{
	__nr_t n = 0;

	if ((n = get_usb_nr()) >= 0) {
		/* Return a positive number even if no USB devices have been found */
		if ((n + NR_USB_PREALLOC) > MAX_NR_USB)
			return MAX_NR_USB;
		else
			return n + NR_USB_PREALLOC;
	}

	return 0;
}