linux-kernel - Re: Userspace - Kernel Space "Connector" test

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Message-ID: <e1d5030b0804040001t2a2b2fd3j75c656ec2318a932@mail.gmail.com>
Date:	Fri, 4 Apr 2008 12:31:33 +0530
From:	"Midhun A" <midhunagni@...il.com>
To:	"Evgeniy Polyakov" <johnpol@....mipt.ru>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Userspace - Kernel Space "Connector" test

Hey,

  Thanks a lot. I have changed the idx value to 7 and it worked. :)

Thanks,
Midhun

On Thu, Mar 27, 2008 at 8:08 PM, Evgeniy Polyakov <johnpol@....mipt.ru> wrote:
> Hi.
>
>
>  On Wed, Mar 26, 2008 at 03:41:16PM +0530, Midhun A (midhunagni@...il.com) wrote:
>  >    I want to use the Connector module (CONFIG_CONNECTOR) for Kernel
>  > space to User space communication.  My kernel version is 2.6.22.
>  > Before using it, I am trying out the example programs in the
>  > Documentation folder. I have cn_test.c built into the kernel (not
>  > loaded as a module) and I have compiled ucon.c.
>
>  You have to use smaller index than 32 or increase CN_NETLINK_USERS
>  parameter in include/linux/connector.h
>
>  Currently all kernel users fit that limitation, which is ok.
>
>  Also, parameter used in bind() is a bitmap of requested groups, to
>  listen on 0x123 idx you have to add it via setsockopt(), which is
>  commented in ucon.c.
>
>  So, either switch to smaller group number (connector index) or increase
>  above limit. If you will select the former case (it is simpler from
>  userspace point of view), you have to change bind() group, note that it
>  is a bitmap, os group N equals to (1<<N) bind() value. If you will
>  select the latter case and recompile connector module, then you have to
>  uncomment setsockopt() code in ucon.c
>
>  Both methods work, and you will get something like this:
>  $ sudo ./ucon
>  Thu Mar 27 17:29:19 2008 : [123.457] [00000002.00000000].
>  Thu Mar 27 17:29:20 2008 : [123.457] [00000003.00000000].
>  Thu Mar 27 17:29:21 2008 : [123.457] [00000004.00000000].
>  Thu Mar 27 17:29:22 2008 : [123.457] [00000005.00000000].
>  Thu Mar 27 17:29:23 2008 : [123.457] [00000006.00000000].
>
>  --
>         Evgeniy Polyakov
>
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