I'm implementing a free space on disk bar where while files are being copied, the free space bar updates. I need some way of being notified of file system changes. What's the best way to go about doing this?
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The File System Events Programming Guide has all the info you need. You want to register with the File System Events API (OS X 10.5 and later).
Barry Wark
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Stu Connolly has a great Objective-C wrapper for the FSEvents C API called SCEvents. You can get it here: http://stuconnolly.com/blog/scevents-011/ – Rob Keniger Oct 01 '09 at 03:37
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The above links are dead, so here we go: https://developer.apple.com/library/archive/documentation/Darwin/Conceptual/FSEvents_ProgGuide/UsingtheFSEventsFramework/UsingtheFSEventsFramework.html – StefanS Mar 06 '20 at 07:38
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To monitor operations on individual files you can use kqueue file change notifications. Uli Kusterer has a nice Obj-C wrapper called UKKQueue.
You can get it here: http://zathras.de/angelweb/sourcecode.htm
If you want to watch an entire folder, FSEvents (and the SCEvents wrapper) will probably be of more use.
Nick Forge
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Up-to-date versions of this code can now be found at GitHub: http://github.com/uliwitness/UliKit – Nick Forge Mar 09 '10 at 03:27