udev, init.d and a daemon

Hello,

I've a problem designing a boot script, and I find no example.

The problem:
- Logitech G15 (and like) USB keyboards have a LCD display and few
(or lots) extra keys
- g15daemon is a deamon need to handle the display, and to handle the
extra keys in xorg (xkb-data (>= 0.9+cvs.20070428-1) )
- g15daemon requires the kernel module uinput, to push back the
extra keys (after decoding it, according to keyboard version)

Actual solution:
- a standard init.d script, which start and stop a deamon

Now I'm thinking/writing about a event based rule (with udev) which
handles also some short disconnection of USB bus on some systems.

Problems:
- How to force the deamon to be loaded BEFORE xorg in insserv?
I don't find a "before of" dependency in LSB headers
- How to handle the common case: keyboard is already attached
(daemon is in /usr filesystem), with udev.
- How to load uinput module? Actually I modprobe and I pool
to see if the device is created, every 0.1 seconds for 5 seconds.
Note this could be done concurrently detaching the command, but
anyway is not event based as I would like.

any suggestions/example?
How would it work on upstart?

Notes:
- actually g15daemon doesn't support multiple keyboards, but
libg15 library does.
- init.d script is still need for shutdown phase

ciao
cate




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Marco d'Itri wrote:
> On Aug 11, "Giacomo A. Catenazzi" <cate.RemoveThis@debian.org> wrote:
>
>> - How to handle the common case: keyboard is already attached
>> (daemon is in /usr filesystem), with udev.
>
> cd /lib/udev/
> . ./hotplug.functions
> wait_for_file /dev/log

Thanks. I was looking for such function since years!

>
>> - How to load uinput module? Actually I modprobe and I pool
> I expect that it would be autoloaded by udev when the hardware is
> installed.

uinput is "input from userspace", so no hardware.
But probably CONFIG_INPUT_UINPUT must be set "y" on debian kernels.


>> - init.d script is still need for shutdown phase
> Is there any point in killing such a daemon on shutdown instead of
> letting the generic init scripts do it?

Maybe. I like to manually start and stop daemons (especially
for tests), and for upgrades I think we need a sysadmin method for stop and
(re)start a deamon.
But I'll think more about this.

Anyway, thanks!

ciao
cate


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