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Kernelspace to Userspace message passing


I have an userspace application running, which communicates to a kernel modules
using IOCTLs. Now, from time to time, the kernel needs to send a message back to the 
application. Now one alternative would be that the app polls the kernel using IOCTLs
to see if any message is waiting. How can I avoid that and send a message directly
as in a callback or signal?

Any ideas?

TIA,
 Sandip

-- 
Sandip Bhattacharya
sandipb @ bigfoot.com
http://www.sandipb.net
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