这个和网卡的event-notify是一样的逻辑，内核看到有什么事情发生，可以通知到用户，然后用户可以根据自己的需求做一些处理。第一次看到，记录一下算是可以日后可以用到的功能。
man inotify。
inotify – monitoring filesystem events
描述： The inotify API provides a mechanism for monitoring filesystem events. Inotify can be used to monitor individual files, or to monitor directories. When a directory is monitored, inotify will return events for the directory itself, and for files inside the directory.
The following system calls are used with this API:
* inotify_init(2) creates an inotify instance and returns a file descriptor referring to the inotify instance. The more recent inotify_init1(2) is like inotify_init(2), but has a flags argument that provides access to some extra functionality.
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