Re: Kext Load on demand and daemon communication
Re: Kext Load on demand and daemon communication
- Subject: Re: Kext Load on demand and daemon communication
- From: Quinn <email@hidden>
- Date: Wed, 17 Oct 2007 09:46:54 +0100
At 10:53 -0700 16/10/07, Eric Long wrote:
What's the secret to making this work?
It's not what you're missing, it's what the system is missing (-:
Both I/O Kit and launchd are strongly oriented towards
launch-on-demand semantics. What's missing, however, is a connection
between the two. For example, you could imagine a world where your
daemon's launchd property list file contains an I/O Kit matching
dictionary, and launchd launches it whenever a matching I/O Kit
service exists.
Alas, implementing this is tricky, because it would introduce a
layering violation between launchd and I/O Kit. We're hoping to
address this <rdar://problem/4551362>, but you won't see it for a
while (you definitely won't see it on 26 Oct :-).
In the meantime, there are some less-than-ideal workarounds:
o As Shaun mentioned, there's KUNC.
o Another option is for your launchd property list to specify some
on-demand criteria that your KEXT satisfies. For example, your
launchd property list could register a UNIX domain socket with a well
known path. When your KEXT comes up, it connects to that socket,
thereby triggering the launch of your daemon.
S+E
--
Quinn "The Eskimo!" <http://www.apple.com/developer/>
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
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