创建原始套接字，构造ICMP协议ECHO数据头，发送数据sendto 接收数据recvfrom，分析返回IP数据头及ICMP数据头 程序代码极其简单，适合初学网络编程者参考- Founds the primitive sleeve joint character, structure ICMP the
agreement ECHO data head, transmits data sendto receive data recvfrom,
the analysis returns to the IP data and the ICMP data procedure code
is extremely simple, suitablly begins studies the network programming
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