Subject: Re: Cardbus
To: Lennart Augustsson <>
From: Chris G. Demetriou <>
List: tech-kern
Date: 12/28/1999 16:01:58
Lennart Augustsson <> writes:
> wrote:
> >         Traditionally UNIX assumes there will be no changes made to device
> >         attach/detach during its runtime.  Because of it UNIX do not really
> >         have a good way to notify of changes to the userland programs, and
> >         not many userland programs are designed to be adaptable to those
> >         changes.  I think that we may need to hide those dynamic changes to
> >         network devices (interface removal, pcmcia slot power down and
> >         other things) from the userland programs to "preserve" traditional,
> >         not-too-many-changes-to-list-of-devices view from uesrland.
> I think we need to bite the bullet.  Devices that come and go are here.
> We can try and hide it a little, but they are still here.  I'd rather see some
> mechanism to notify userland about changes so we can cope with these
> things.

I agree.

The "things never change" may well have been good in the 70s and 80s,
but it's been a while since devices have been hot-pluggable in
commodity hardware (PCs) (even discounting hot-pluggable SCSI devices
which have been been kinda-supported for varying levels of 'kinda' for
years in various systems).

PCMCIA/CardBus, USB, ...  it's only going to get worse.  UNIX-like
systems are going to have to cope, unless they want to be relegated to
running only in static-configuration server-ish environments.  (Can't
even really do workstations, thanks to USB's pluggability and users'

Chris Demetriou - -
Disclaimer: Not speaking for NetBSD, just expressing my own opinion.