Hi all,
I am facing a problem using mbuff. I dont want to use this mbuff
extensively but just a 5-6 bbytes of information to be passed from kernel
space to user space. For all other data communication I am using rt-fifo (as
my application needs are more suitable for using rt-fifos) and they are
working fine. I just want to get a free rt-fifo and pass this number to user
space so that user space module can start communicating with kernel module
using that RTfifo. To send this fifo number to user space I thought of using
shared memory. ( I can not just simply use some RTFIFO predefined hard coded
in both the modules, since it might be used by some other processes/modules
and I cannot destroy this and cause problems to other modules)
Hence, I thought of using mbuff ( other than mbuff, I have other option
like, assign some memory in /etc/lilo.conf and using that address I can
access the shared memory from both the kernel and user side - but this is
not advisable in my application as this requires a bit setup and calcuation
is required before loading my module).
I am assigning the memory using mbuff_alloc() on both sides with same amount
of memory chunk requested. say 0x100000. I am writing into this space from
kernel module and this will wait and I am starting the user application
which uses the same call mbuff_alloc to allocate the memory with the same
chunk (0x100000) requested.(I assume that both the pointers now are pointing
to same memory location - Am I correct ? ) I am trying to read the data from
the mbuff allocated pointer. But the data read is different than the data
written in kernel module.
Does anyone have idea about where I am going wrong. And, I would like to
know how is /dev/mbuff device file related to this. My system is kernel
2.2.18 and rtl3.0
Thanks in advance.
Ravi Kumar
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