聊天程序，主要系统调用，包括：套接字（）

代码说明：

聊天程序，主要的系统调用包括：socket()-创建Socket；bind()-将创建的Socket与本地端口绑定；connect()与accept()-建立Socket连接；listen()-服务器监听是否有连接请求；send()-数据的可控缓冲发送；recv()-可控缓冲接收；closesocket()-关闭Socket。-Chat program, the main system calls, including: socket ()- Create Socket bind ()- will create a Socket with the local port binding connect () and accept ()- establish a Socket connection listen ()- server monitor whether there is connection requests send ()- data buffer to send controllable recv ()- controllable receiver buffer closesocket ()- Close Socket.