On Tue, 2004-09-28 at 10:53 +0200, Duncan Sands wrote:
> > The userspace monitoring dÃmon uses an ioctl to tell the kernel when the
> > link goes up or down. The driver then sets atm_dev->signal to
> > ATM_PHY_SIG_{FOUND,LOST} which prevents pppd from attempting to dial up
> > while there's no link.
>
> Hmmm, I confess I'd forgotten about this. Are you sure pppd uses it? Last
> time I checked it wasn't used by pppd and also not by the kernel ATM layer.
> Still I agree that the right way to do things is to fix pppd/atm to actually
> use/export this info.
I think it is enforced by the ATM layer, unless I'm misremembering and
it was only the -EAGAIN when the firmware isn't loaded that I'm
remembering. I don't think so though -- I think it was really refusing
to let me run pppd when there was no link. At one point I was walking
round the building trying it in different phone sockets.
> > And even if it were purely cosmetic -- it's so simple it might as well
> > be done in the kernel anyway, surely?
>
> It is also simple to do in user-space :)
Once that's _all_ we'd be doing in userspace, the 'cost' would have to
include the added complexity of the mere _existence_ of the dÃmon, and
getting it to run with hotplug, and all the other stuff which made
people like Phil give up on the whole thing -- and made me swear a lot
and vow to abolish it.
--
dwmw2
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