Date: Fri, 31 Dec 1999 17:13:14 +0100 From: Wilko Bulte <wilko@yedi.iaf.nl> To: Brian Fundakowski Feldman <green@FreeBSD.ORG> Cc: Chuck Robey <chuckr@picnic.mat.net>, FreeBSD-current@FreeBSD.ORG Subject: Re: multiple cd devices Message-ID: <19991231171314.A92878@yedi.iaf.nl> In-Reply-To: <Pine.BSF.4.10.9912310922230.4996-100000@green.dyndns.org>; from green@FreeBSD.ORG on Fri, Dec 31, 1999 at 09:25:42AM -0500 References: <Pine.BSF.4.21.9912310152050.2014-100000@picnic.mat.net> <Pine.BSF.4.10.9912310922230.4996-100000@green.dyndns.org>
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On Fri, Dec 31, 1999 at 09:25:42AM -0500, Brian Fundakowski Feldman wrote:
> On Fri, 31 Dec 1999, Chuck Robey wrote:
>
> > On Fri, 31 Dec 1999, Brian Fundakowski Feldman wrote:
> >
> > > The way certain devices, like cd with its monotonically increasing counter
> > > where devices are probed in order and assigned device based on precedence
> > > and not hardwiring/controller connection, work is consistent between
> > > the kernel and MAKEDEV. If you have 2 cd devices, you have cd0 and cd1,
> > > so MAKEDEV accepts "cd2" for "two cd devices". All CD devices work
> > > that way. Disks don't, because there is potential for hard-wiring
> > > there, and will often be gaps.
> >
> > Why are "certain" devices wildly different than all other ones? I've
> > never encountered that kind of syntax before, and I can't see that it's
> > documented anywhere at all. Certainly, MAKEDEV itself (in it's
> > comments) treats cd* just like all the others, specifying that the number
> > following is a unit number, and *not* a quantity. I don't know when this
> > happened, but it's surely not obvious. Not one word in the handbook,
> > either.
>
> *shrug* This is the only rationality I could think of. Obviously, this
> breaks POLA, so it should be changed (with ample warning).
As for ample warning: I've seen MAKEDEVs display a list of the devices
they are creating. I think the Tru64 version does this. I myself think this
is a good behaviour (and hope people won't start yelling 'bloat' for once)
W/
--
Wilko Bulte Arnhem, The Netherlands - The FreeBSD Project
WWW : http://www.tcja.nl http://www.freebsd.org
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