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Re: Bsd sockets in a kext

Hi Chris,

Thank you for the tip. This seems to be the way to go but I still have a lot
of trouble and I'm confused by the comments in the headers.


Do you have an howto or some source code example, that would help a lot.


As somebody suggested I can launch apps from the kernel extension (this is
what I actually do for the moment) but I want to have a very flexible driver
with preference files and other stuff that should not be done in the kernel,
so I really need a daemon running as a user process. All I need is to send a
a key number saying what multimedia key is pressed on the keyboard.

Thanks a lot for the help.

--
Stephane ODUL
email@hidden
http://www.soft.odul.net/


> Hi --
>
> The best (and easiest )way to do this is to use messageClients() in your
> kext and have your daemon register for notifications using functions
> such as IOServiceAddInterestNotification(). Make sure to call
> registerService() in your start routine so that you can find your object
> in the registry.
>
> The daemon can wrap the IONotificationPort in a CFMachPort and add it to
> the runloop.
>
> -- Chris
>
> On Friday, March 8, 2002, at 10:22 AM, Shantonu Sen wrote:
>
>> I'm not sure this is the way to go for such a small amount of data.
>> When this has been asked about before, it was suggested that the daemon
>> connect to your kext via the IOUserClient mechanism and repeatedly wait
>> for it to send back input. This is essentially a pull instead of push
>> process.
>>
>> If your kext only has to launch programs, can you use KUNCExecute?
>>
>> Shantonu
>>
>> On Friday, March 8, 2002, at 01:04 PM, Justin C. Walker wrote:
>>
>>> Hi, Stephane,
>>>
>>> On Friday, March 8, 2002, at 03:51 AM, Stephane ODUL wrote:
>>>
>>>> I9m writing a driver to handle multimedia key for a usb keyboard.
>>>>
>>>> My kext need to send message to a user process daemon.
>>>>
>>>> I9ve tried to setup the communication using the bsd sockets. My daemon
>>>> compile fine but the when I build the kext I have an error saying
>>>> functions
>>>> like socket() are not declared while <sys/socket.h> is included.
>>>>
>>>> Maybe I9m not using the good solution. Help me I ve been stucked on
>>>> this for
>>>> 3 days now.
>>>
>>> I'm not sure what the problem is. Are you using 'socket(2)' in the
>>> user-space daemon, or in the kext? You can't use user-space calls in
>>> the kernel, because the operating environments are completely
>>> different.
>>>
>>> You will need to use kernel versions of the user-mode calls in your
>>> kext. There isn't any good documentation on this, but you can refer
>>> to the Wright/Stevens book (TCP/IP Illustrated, V2) for descriptions
>>> of the in-kernel code; and you can look at the 'xnu' source from
>>> Darwin for examples of this use, in NFS (xnu/bsd/nfs) and in the AURP
>>> code (xnu/bsd/netat/aurp*).
>>>
>>> This has also been discussed on the Darwin lists, so you might get
>>> some good pointers from the archives.
>>>
>>> Regards,
>>>
>>> Justin
>>>
>>> --
>>> Justin C. Walker, Curmudgeon-At-Large *
>>> Institute for General Semantics | It's not whether you win or
>>> lose...
>>> | It's whether *I* win or lose.
>>> *--------------------------------------*-------------------------------*
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References: 
 >Re: Bsd sockets in a kext (From: Chris Sarcone <email@hidden>)



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