Re: User-space to kernel communication
Re: User-space to kernel communication
- Subject: Re: User-space to kernel communication
- From: Andrew Gallatin <email@hidden>
- Date: Tue, 9 Jan 2007 11:51:40 -0500 (EST)
Quinn writes:
> o On current systems, there is no (supported :-) way to create an
> IOUserClient that supports 64-bit user space programs. If you need
> to support such programs, IOUserClient isn't for you.
FWIW, tradidtional BSD ioctls work just fine for communication with a
64-bit user space program (I'm talking about you calling cdevsw_add()
and managing things yourself, as opposed to using an IOKit class). As
a bonus, ioctls were faster (ie, lower latency) than the user client
stuff as well when I measured them on ppc sometime in the late 10.3
timeframe.
Drew
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