ioctl:比read/write等函数更通用的操作设备的方法
https://blog.csdn.net/qq_53144843/article/details/126982285
https://blog.csdn.net/weixin_42570192/article/details/121323337
https://blog.csdn.net/u013318019/article/details/123023235
https://www.cnblogs.com/blogernice/articles/9877626.html
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