Mike Smith writes:
>
> On May 6, 2005, at 2:48 PM, Andrew Gallatin wrote:
>
> >> Could you give us a little more to go on, please? I'm really
> >> interested in getting rid of KUNCExecute(), but I can't find any
> ...
> > I use devfs to dynamically create character devices nodes when my
> > driver is loaded. So I think I can probably use the WatchPaths
> > directive to watch for my character device nodes appearing. It will
> > require a wrapper shell script.... Hmm..
>
> Yuck!
Yeah, I forgot how kqueue notifications work. I can't be notified
when my device node is created, without watching all of /dev, which
is not practical.
> You ought to be able to register a service with launchd against a
> 'known'
> port, and then simply message the port to have your service launched.
>
> This is probably the easiest way to get launch/message-on-demand
> semantics out of the kernel at this point.
Thank you, but I think you've just totally confused me. All that I
know about mach ipc could be written on the head of a pin, with plenty
of room for dancing angels. So please take pity.
What's a known port? How is it reserved so somebody else won't get
stomped on? How do I send a message to this port from my driver? Can
you point me at an example which does this?
It sounds like this could essentially be used like a mach version of
FreeBSD's devd, where I can send a message to devd from my driver via
devctl_notify(). This message then causes my user level daemon to be
started...
Thanks,
Drew
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