典型的守护进程实例，通过进程快照查找目标进程是否存在，如不存在则重新启动。-A classic watch dog of process, use process snap to find out whether the target process is working.

tcpDog ,闻入其名,对tcp 感兴趣的狗狗,祝大家狗年进步(TcpDog, smell into its, interested in TCP dog, I wish you all the year of the dog)