我的理解就是Socket就是该模式的一个实现，socket即是一种特殊的文件，一些socket函数就是对其进行的操作（读/写IO、打开、关闭），这些函数我们在后面进行介绍-My understanding is that Socket is the mode of an implementation, the socket is a special file, some socket function is its operation (read/write the IO, open, closed), these functions are described at the back