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SubjectRe: read_proc issue
> I've encountered this problem before, too.  What is the "One True Way"
> to do this cleanly? In other words, if you want to do a calculation
> once every time someone runs "cat /proc/foo", what is the cleanest way
> to do that? The solution we came up with was to check the file offset
> and only do the calculation if offset == 0, which seems pretty
> hackish.

Another approach is to do the calculation open and remember it in per
fd private data. You can recover that and free it on release. It could
even be a buffer holding the actual "content"
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