说明：  通过socket来检测网络的通讯功能，socket是一进程与另一进程进行双向通讯的最终的套接点， socket是伯克利在Unix中推出的计算机系统的IPC和异种机网络互联的基本机制。为了更好的理解 本题目的某些结构，需要深入的了解计算机系统和其网络协议。此文章的内容可以作为计算机编程人员的指导性文章。
(To detect the network through the socket communication functions, socket is one process with another two-way communication process, the ultimate point of sockets, socket is in the Berkeley Unix computer system introduced in the middle of the IPC and network interconnection of heterogeneous machines basic mechanism. In order to better understand some of the structure of this subject requires a deeper understanding of computer systems and its network protocol. The content of this article can serve as a computer programmer guiding article.)