Re: Log every access to a file

From: Matthew Seaman (m.seaman_at_infracaninophile.co.uk)
Date: 10/29/03

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    Date: Wed, 29 Oct 2003 10:00:15 +0000
To: andi payn <andi_payn@speedymail.org>

    On Wed, Oct 29, 2003 at 01:07:26AM -0800, andi payn wrote:

    > The second is to use fam. I should mention that I've only used fam under
    > linux, and, after a brief glance, it looks like the FreeBSD port
    > (/usr/ports/devel/fam) is not as powerful--in particular, FreeBSD
    > apparently doesn't provide imon support (a way for the filesystem to
    > make a callback to a usermode app like fam--no dnotify or anything
    > similar, either, apparently). Which implies that it's probably just a
    > heavier-weight way of doing the exact same thing--periodically stat'ing
    > a list of files--and that there is no better solution available.

    Check the kevent(2) man page. It's a generic mechanism for having the
    kernel message your process when some condition occurs, such as
    modification of a file. Unfortunately other than knowing something
    happened, it doesn't tell you a great deal else, like who it was that
    made the alteration.

    Even so, fam(1) has apparently not been patched to use kevent(2) under
    FreeBSD, so, yes, it's probably going to operate by polling the file
    status every so often.

            Cheers,

            Matthew 

    -- 
Dr Matthew J Seaman MA, D.Phil.                       26 The Paddocks
                                                      Savill Way
PGP: http://www.infracaninophile.co.uk/pgpkey         Marlow
Tel: +44 1628 476614                                  Bucks., SL7 1TH UK

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