核心,利用mmap进行映射
uio 编写实例 1 https://blog.csdn.net/wujiangguizhen/article/details/12453253 uio编写实例 2 https://blog.csdn.net/sunjing_/article/details/74725976 https://blog.csdn.net/lsz137105/article/details/100588871