Re: db(3) removal and lastlogx

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Thu, Jun 07, 2012 at 08:36:36AM +0200, Joerg Sonnenberger wrote:
> Hi all,
> there is a bit mechnical work left to remove db(3) dependencies e.g. for
> the password database, but that's mostly that. The last real consume of
> the db(3) API in libc is the lastlogx handling in utmpx. Basically, this
> logs a record in a file indexed by uid. I can think of three different
> approaches for dealing with this:
> 
> (1) Just use a sparse file. This requires by far the least amount of
> code, just some verification logic for a file header and writing to "uid
> * size of entry". Writes should be short enough to ensure atomic writes
> even on NFS. Same for reads. No manual locking needed.

With 32bit uids, this will be very large files. We should avoid this.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--