Linux应用(6)——网络通信/TCP/IP借鉴博客:https://blog.csdn.net/2401_83603768/article/details/151687501;https://blog.csdn.net/sunyctf/article/details/128975665?ops_request_misc=%257B%2522request%255Fid%2522%253A%252233308df854b34cb7450824a35c61f627%2522%252C%2522scm%2522%253A%252220140713.13