参考链接:
Linux struct itimerval用法:
http://blog.csdn.net/hbuxiaofei/article/details/35569229
Linux定时器实验:
https://wenku.baidu.com/view/bb8416d2b9f3f90f76c61b8e.html
Linux 内核的定时机制实验
原文:http://www.cnblogs.com/tanrong/p/6925006.html