A lot depends on what is producing the log file. Is using file test operators or stat() a possibility? If the last modification date on a log file is over a threshold value, can you assume the process has stopped writing to it?
Actually we've been thinking about this ourselves, and despite what I wrote in the first node of this thread, I suppose that eventually we'll either use that or run fuser externally rather than processing /proc ourselves (or we'll check if Linux::Fuser works with current kernels -I suppose so, BTW- and if so, then use that instead).

In reply to Re^2: How to detect if file is in use? by blazar
in thread How to detect if file is in use? by blazar

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