用纯C实现的网络对战五子棋，基本完成五子棋的基本功能以及网络连接。程序打开时应先打开服务器端，再打开客户机端。-Pure C implementation of online play backgammon, the basic completion of the basic functions of backgammon and a network connection. The program should be open to open the server side, and then