Thank you, that was exactly what I was looking for. ++
Unfortunately I can't use it because I have just discovered that File::Tail does not work under windows, or at least not under Active State perl 5.12. It is not available in their package repository, and when I tried to install it by hand most of the tests failed.
Instead I have switched to a simpler algorithm that just monitors the file mtime, and if it changes, reads the entire file. It is inelegant but works.
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