Notifications for file system changed?

cocoa, objective-c

Solution

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).

Problem

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?

Original source