pollset 接口在本机（内核）pollset 层中创建并维护一个文件描述符集和感兴趣的事件。

The pollset interface creates and maintains a file descriptor set and its interested events in the native (kernel) pollset layer.

youdao

设备抽象层为上层应用程序提供了一套标准的、与设备无关的通信接口，并且通过文件描述表、设备描述表和驱动描述表建立了从通信接口到设备驱动的映射。

The device Abstract Layer provides a set of standard communication interface functions unrelated with specific device, which is mapped to device drivers by file table, device table and driver table.

youdao

其中软件体系结构包括：驱动程序、硬件抽象层、虚拟机、读取接口数据文件。

The software structure is made up of device driver, hardware abstract layer (HAL), visual machine (VM) and reading ZIF file.

youdao