虚拟设备在嵌入式LINUX系统中的使用

在Linux系统中，系统是把设备映射为一个特殊的设备文件，用户程序可以象对其它文件一样对此设备文件进行操作。我们可以根据这一点，构造一个不连接任何硬件的设备文件，即虚拟设备。利用这个设备，我们可以把一系列的底层操作转化为应用层操作，以减低上层工作量。

The Use of Virtual Device in Embedded LINUX System

In this paper, it is introduced that device is mapped to a special device file by LUNUX system. The user's program is capable of operating such device file as other common files. Based on that, it is possible to make a device file without connecting any hardware, that is to say a virtual device. Using the virtual device, it is very likely that a series of operations in bottom layer are converted to application layer, so that the workload in application layer is reduced.