IntroductionSome applications that you write from time to time may require you to study changes that occur on the file system. These changes could be that a file arrives, is modified, is closed, etc. Your program can then respond accordingly to these interesting events.
In today's post, I'll show you how to monitor the file system for changes using the hinotify package.
What is inotify?inotify is short for inode notify. It's a piece of the Linux Kernel that adds notifications at the filesystem level so that userspace programs can take advantage of these events. The Wikipedia page on inotify has a good explanation for further reading.
The CodeThere are 3 main jobs that we need to take care of here:
- Create awareness with INotify
- Register your interest in changes
- Respond to the changes
I've tried to comment this code as best I can to show you what's going on. It's all pretty straight forward. Delaying the main thread may seem unintuitive, however without this call being made the program will finish execution without collecting data (because INotify doesn't block!).