[openbeos] Re: driver/module shutdown notification for R1
- From: "Ingo Weinhold" <bonefish@xxxxxxxxxxxxxxx>
- To: openbeos@xxxxxxxxxxxxx
- Date: Sat, 14 Jun 2003 15:25:01 +0200 CEST
On Sat, 14 Jun 2003 15:16:53 +0200 "Waldemar Kornewald" <
Waldemar.Kornewald@xxxxxx> wrote:
> > >Actually, this should be no problem.
> > >We add the ioctl and std_ops action B_UNLOAD_ON_SHUTDOWN.
> > >When the system is shut down the kernel calls
> > >
> > >if(ioctl(fd,B_UNLOAD_ON_SHUTDOWN...) == B_OK)
> > > unload_driver(fd);
> > >
> > >and
> > >
> > >if(module->std_ops(B_UNLOAD_ON_SHUTDOWN) == B_OK)
> > > unload_module(module);
> > >
> > >for each module and driver that is loaded.
> > >
> > >Drivers/modules that do not support this automatically return
> > > B_ERROR or
> > >something like that.
> > >The same goes for drivers/modules that do not need this behaviour.
> > > They
> just
> > >do not implement it and the switch-case part in the driver will
> > > fall
> through
> > >and return B_ERROR.
> > >
> > >Why should we need an additional call for driver/modules if we can
> > > use
> the
> > >current API without any problems?
> > >The advantage is that old drivers will still work and can be
> > > adapted
> without
> > >much work (just add a new "case" statement).
> > >
> > >Waldemar
> > >
> > >
> > >
> > Isn't the 'uninit_driver()' function meant for this purpose? The
> > BeBook
> > says it's called when unloading the driver ...
>
> Good point. :))
>
> Still, how do modules know that the system is shutting down?
> This was actually the source of my problem. PPP is a module in BONE
> (and
> will be a module in OBOS, too). The PPP module must disconnect before
> the
> system is shut down.
> I could write some application for that task and execute it in the
> shutdown
> script, but when we go embedded (OBIA ;) it will be better to have
> this in
> the kernel itself. And it is better not to rely upon scripts for jobs
> that
> could be done automatically. This would be the next step to a
> terrible
> Linux-I-script-everything-please-edit-me-with-a-text-editor-super-
> duper-comp
> licated-world! ;)
Is there anything that speaks against, that the kernel simply stops all
services and unloads all drivers/modules when the system is shut down?
CU, Ingo
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