Date: Mon, 16 Aug 1999 11:45:19 +0100 From: Brian Somers <brian@Awfulhak.org> To: Dag-Erling Smorgrav <des@flood.ping.uio.no> Cc: Brian Somers <brian@Awfulhak.org>, Poul-Henning Kamp <phk@critter.freebsd.dk>, Julian Elischer <julian@whistle.com>, cvs-committers@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/miscfs/specfs spec_vnops.c src/sys/sys conf.h Message-ID: <199908161045.LAA76741@keep.lan.Awfulhak.org> In-Reply-To: Your message of "16 Aug 1999 11:11:06 %2B0200." <xzpr9l4rsyd.fsf@flood.ping.uio.no>
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> Brian Somers <brian@Awfulhak.org> writes:
> > From what I can tell, this requires that the driver ignores the minor
> > number ('cos it's the same for all accesses) but keeps a track of of
> > the process id in the device structure. The driver would need to
> > know about fork()s and *all* close()s, and would probably need to
> > use something faster than `sequential' to find the device structure
> > from the pid (some sort of hash).
>
> What if the same process needs several instances of the same device?
Yes - it would need to know about dup*() too and would have to store
an instance number as well as the processid. It's definitely
non-trivial.
> DES
> --
> Dag-Erling Smorgrav - des@flood.ping.uio.no
>
--
Brian <brian@Awfulhak.org> <brian@FreeBSD.org>
<http://www.Awfulhak.org>; <brian@OpenBSD.org>
Don't _EVER_ lose your sense of humour ! <brian@FreeBSD.org.uk>
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