Re: Kauth
Re: Kauth
- Subject: Re: Kauth
- From: Terry Lambert <email@hidden>
- Date: Tue, 16 May 2006 13:00:27 -0700
On May 16, 2006, at 1:12 AM, Jérome Foucher wrote:
Hi folks !
I've started to use kauth for a future application.
I've looked at KauthORama sample code, and have a few questions for
which I didn't manage to find any answers in the archives.
First of all, the KauthORama's kext does not load automatically at
startup. Is it done on purpose, or is it a bug ?
This is on purpose for this sample code.
There's a lot of documentation on KEXT loading in this lists'
archives, actually; it has to do with when and why KEXTs are loaded,
what keeps them unloaded, whether an application should be used to
load and unload them, etc.. The answer depends on your particular use
and implementation: the problem you are trying to solve.
In general, there's not a lot of documentation on this particular
topic that has been sorted and sifted into one place, though. I
suspect it's because if you force a KEXT to load each time the system
boots, no matter what, then you can end up with a KEXT with a bug that
can turn your system into a doorstop until you delete the KEXT or
reinstall the system.
If you have particular needs, you should look over this lists'
archives carefully.
More annoying, if I do not call "kextunload KauthORama" and shutdown
my Mac, I get a kernel panic (each time, and this happened on all
the machines I've tested). I checked the code a few times and could
not find a bug in it that coulw cause a kernel panic.
Please file a bug via Bugreporter <http://developer.apple.com/bugreporter/
>. Include the stack traceback and other information from having set
the debug flags, so that it's possible to tell where things are
crashing. Als indicate if the code is the stock Apple sample code, or
if you have modified it.
If all of this is "normal", does this mean my user-land app has to
load the kext itself and make sure it's unloaded before the computer
shuts down ?
In general, this should not be necessary, so long as you maintain
appropriate reference/use counts so that a KEXT does not get unloaded
while it's in use. This is covered pretty well in the KEXT
programming information on <http://developer.apple.com/>.
-- Terry _______________________________________________
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