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    SubjectRe: read_proc issue
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    > 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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