I/O设备管理软件一般分为4个层次，如下图所示。图中①②③分别对应（ ）。
- A.设备驱动程序、虚设备管理、与设备无关的系统软件
- B.设备驱动程序、与设备无关的系统软件、虚设备管理
- C.与设备无关的系统软件、中断处理程序、设备驱动程序
- D.与设备无关的系统软件、设备驱动程序、中断处理程序
正确答案及解析
正确答案
解析
具体层次从上往下分别为用户级I/O层、设备无关I/O层、设备驱动程序、中断处理程序、硬件。
硬件：完成具体的I/O操作。
中断处理程序：I/O完成后唤醒设备驱动程序。
设备驱动程序：设置寄存器，检查设备状态。
设备无关I/O层：设备名解析、阻塞进程、分配缓冲区。
用户级I/O层：发出I/O调用。
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