On Wed, Feb 27, 2002 at 09:42:04PM +0000, Alan Cox wrote:
> > 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"
It might also be an idea to export proc_calc_metrics() from
fs/proc/proc_misc.c because quite a lot of code actually tries to do
exactly the same.
Erik
-- J.A.K. (Erik) Mouw, Information and Communication Theory Group, Faculty of Information Technology and Systems, Delft University of Technology, PO BOX 5031, 2600 GA Delft, The Netherlands Phone: +31-15-2783635 Fax: +31-15-2781843 Email: J.A.K.Mouw@its.tudelft.nl WWW: http://www-ict.its.tudelft.nl/~erik/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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