A software routine that services and controls the hardware activities of an I / O device. It allows user programs to perform data transfers without specific knowledge of the device characteristics.

• 一种维护和控制输入输出设备(硬件)正常工作的(软件)例行程序,它允许用户程序不需具体了解设备特性参数就可以进行数据传送。同device handler, device driver。