inotify
inotify is a replacement for dnotify that overcomes the latter's limitations, such as the inability to unmount the file-system on which we are dnotifying on, the requirement of opening a file-descriptor for every directory we want to be informed, the shortage of the number & type of events and not getting to know the exact file/directory that has changed on disk. inotify overcomes all this by providing a much cleaner interface and is a part of the 2.6.13 kernel. The kernel Documentation is at Documentation/file-systems/inotify.txt.
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