exernalizing module functions to user space

exernalizing module functions to user space

[Todd]

I would like to make certain functions in my driver
available to user space applications.  At first it
seemed that EXTERN_SYMBOL was the solution, but this
appears to externalize the functions only to other
modules.
I considered adding specialized entries in the
file_operations structure...but this does not seem
appropriate.  Can anyone explain the proper method of
acheiving this??

TIA
-Todd


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Re: exernalizing module functions to user space

[Dan Kegel]

Todd wrote:
> I would like to make certain functions in my driver
> available to user space applications.  At first it
> seemed that EXTERN_SYMBOL was the solution, but this
> appears to externalize the functions only to other
> modules.
> I considered adding specialized entries in the
> file_operations structure...but this does not seem
> appropriate.  Can anyone explain the proper method of
> acheiving this??

Yes.  This is an extremely basic question, you may wish
to grab a book or two on linux kernel programming.
The kernel is in a different address space than user code,
so you can't use direct calls.
Write a syscall, an ioctl, a driver, or create /proc entries.
- Dan

--
Dan Kegel
http://www.kegel.com
http://counter.li.org/cgi-bin/runscript/display-person.cgi?user=78045


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