there are a number of nice packages on cpan for monitoring files in a cross-OS portable fashion, such as File::Monitor, or File::ChangeNotify, or AnyEvent::Filesys::Notify. I believe, for real-time quick notifications, they rely on Mac::FSEvents. Otherwise, they fall back to very slow scanning.
the problem is that Mac::FSEvents no longer compiles on osx yosemite. there are now errors in FSEvents.xs. probably a change in OSX.
is there a different cpan module recommended that provides immediate notification of file changes? I just need a simple blocking call on a few files with a callback.