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Re: User-space to kernel communication
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Re: User-space to kernel communication

  • Subject: Re: User-space to kernel communication
  • From: Kevin Elliott <email@hidden>
  • Date: Tue, 9 Jan 2007 08:17:18 -0800
At 21:19 -0500 on 1/8/07, Greg wrote:
This looks very interesting and so far it seems to be exactly what I want as it uses a
familiar API (bsd sockets) and allows for bidirectional communication. With this available I
don't see why anyone would want to use sysctl or the IOUserClient stuff... are there any
disadvantages associated with using kernel control sockets over the aforementioned
sysctl/IOConnectMethod stuff?

It all depends on what your trying to do... IOUserClient is quite fast (possibly faster than sockets, and definately not slower). It also makes it possible to create true "API's" in a way that sockets don't readily support (See the SCSITaskUserClient, FireWireUserClient, etc...). It really isn't that difficult to use and is well documented. I don't have time to search right now, but their are at least 2 UserClient samples on developer.apple.com. It might be over kill for what your doing, but it all depends...

You haven't mentioned a lot of detail about what your doing (how fast the data needs to be moved, how often, etc.), but setProperty is also an option for passing data into the kernel. It's by far the easiest to implement and if you don't need high performance and you aren't moving lots of data it's a reasonable option.
--
______________________________________________________
Arguing with an engineer is like wrestling with a pig in mud.
After a while, you realize the pig is enjoying it.
______________________________________________________
Kevin Elliott <mailto:email@hidden>
AIM/iChatAV: email@hidden (video chat available)
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References: 
 >User-space to kernel communication (From: Greg <email@hidden>)
 >Re: User-space to kernel communication (From: Josh Graessley <email@hidden>)
 >Re: User-space to kernel communication (From: Greg <email@hidden>)
 >Re: User-space to kernel communication (From: "Greg Miller" <email@hidden>)
 >Re: User-space to kernel communication (From: Greg <email@hidden>)
 >Re: User-space to kernel communication (From: Brian Bergstrand <email@hidden>)
 >Re: User-space to kernel communication (From: Greg <email@hidden>)
 >Re: User-space to kernel communication (From: Brian Bergstrand <email@hidden>)
 >Re: User-space to kernel communication (From: Greg <email@hidden>)

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