Re: Communication between two kernel modules

["Rok Papež" <rok.papez@kiss.uni-lj.si>]

Hello Michael!

On Monday 18 February 2002 18:32, Michael Zhu wrote:

> Hi, how can I call some kind of APIs from kernel mode,
> such as open, ioctl and close? Because I need to use
> some services of another kernel module from my kernel
> module and I have no source code of the module which
> provides the services. Now I can only access the
> module in user space using the open, ioctl and close
> APIs. Can I do the same thing in my kernel module?
> Thanks.

Create a user-space app that will ioctl into your driver and wait for 
requests. When your module needs to call the other module it delivers request 
to the user-space app wich in turn calls the other module and returns results 
via another ioctl call.

Take care not to deadlock.. In user space app use fork() or threads and 
handle module requests async...

Be ready to handle an event when your user-space app unexpectedly dies.

-- 
best regards,
Rok Papež.