Messages in this thread | | | Date | Fri, 4 Apr 2008 12:31:33 +0530 | From | "Midhun A" <> | 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@2ka.mipt.ru> wrote: > Hi. > > > On Wed, Mar 26, 2008 at 03:41:16PM +0530, Midhun A (midhunagni@gmail.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 >
| |