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Re: kernel extension

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Re: kernel extension

Subject: Re: kernel extension
From: Mike Fischer <email@hidden>
Date: Fri, 23 Jun 2006 22:20:51 +0200

Am 23.06.2006 um 21:03 schrieb David A Rowland <email@hidden>:

I'm trying to make a kernel extension launch at boot time by placing
a startup item in Library/StartupItems. I have followed all the
rules, I think. The directory structure is:

MyKext
   MyKext
   com.My.kext
   StartupItems.plist


Should be "StartupParameters.plist" I think. That's what I use.

So your kext bundle is actually installed inside the StartupItem? Why not in /System/Library/Extensions/ ?

All the permissions have been set by PackageMaker and seem to be
right -- root, wheel


Permissions for the StartupItem which work look like this:

/Library/StartupItems/MyKext				root:wheel 755
/Library/StartupItems/MyKext/MyKext			root:wheel 754
/Library/StartupItems/MyKext/StartupParameters.plist	root:wheel 644

Permissions for a kext which work in my case look like this:

/System/Library/Extensions/MyKext.kext root:wheel 755 /System/Library/Extensions/MyKext.kext/Contents root:wheel 755 /System/Library/Extensions/MyKext.kext/Contents/Info.plist root:wheel 644 /System/Library/Extensions/MyKext.kext/Contents/MacOS root:wheel 755 /System/Library/Extensions/MyKext.kext/Contents/MacOS/MyKext root:wheel 644


MyKext contains scripts to call kextload for the .kext

But it doesn't work. var/log/system.log seems to show a violation of
permissions, but I'm not sure that is the problem.


What does the following command in a Terminal window show?

$ sudo SystemStarter start "MyKext" (assuming that "MyKext" is the service advertised in the StartupParameters.plist as "Provides")

Is there a sample installation for kernel extensions that I could examine?

I don't know. I do know that I have an installer which is able to install and load a StartupItem and a kext and activate both from its postflight script by doing this:

kextload /System/Library/Extensions/MyKext.kext
SystemStarter start "MyStartupService"


HTH
Mike
--
Mike Fischer     Softwareentwicklung, EDV-Beratung
                                Schulung, Vertrieb
Address: Bundesstrasse 9, D-20146 Hamburg, Germany
Phone: +49 (0)40/45038886, Fax: +49 (0)40/45038887

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