这是封装的socket库，用poll采用非阻塞模式，接收消息与网线断开处理以回调函数方式到应用层处理，使用起来非常方便，带服务端和客户端的测试实例。,This is the package socket library, use of non-blocking mode by poll, receiving the news and cable disconnect callback function to handle the way to the application layer to d