FSEvents and copying large files

I'm using FSEvents to monitor a directory of files that will have some large files copied into it. Currently FSEvents seems to be sending out a notification when I've begun copying the file, and again when it's finished copying the file. When it's a smaller file though, I only get the one event. Is there any way to check if a file is in the middle of being copied?

This is for Snow Leopard by the way.


I ended up just using lsof to check if the file is open at a kernel level. I only begin processing the file once lsof has determined that the file is no longer in use.

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