Linux内核编程，设计某一个函数，输入为Linux系统某一个进程的进程号（PID），函数将*该进程的所有子孙。Linux内核进程家族为多叉树数据结构，以祖先进程为根节点。对于这种数据结构，后序遍历树的每个节点，在遍历同时删除节点，就可以删除整个进程树。-Linux kernel programming, design one function, one input for a Linux system process ID (PID), the function will kill all descendants of that process. Linux kernel process family is multi-tree data structure to the process is the root ancestor. For this data structure, post-order traversal of the tree each node in the node traversal and delete, you can delete the entire process tree.