linux 下的聊天室程序, 用linux c写一个局域网的聊天室程序,基于组播来实现，为方便调试只在本机上实验，不和其他的机器通讯。

加入组播的任何一个成员发送的消息，在组内的其他成员都能收到-linux chat room under the program, using linux c write a LAN Chat program, based on the multicast to achieve, to facilitate debugging only in this machine experiments, and other machines do not communication. To join any one of the members of multicast messages sent in the other members of the group can receive