Re: Help on Kernel-Application Programme Communication

[Arjan van de Ven]

In article <38709EBB.10768@mta6> you wrote:
>    The difficulty comes when I want the kernel wants to communicate
> with the daemon. I don't know how to implement this. Maybe it is a 
> bad idea.But how can I? I'd really appreciate any assistance--I have
> been thinking on it for such a long time.

There are several ways to do this, but you will be in trouble if it has to
be done from interrupt-context.

[random order]

1) Build a characterdevice, the daemon does a blocking read and writes the
   result.
2) 1) but instead of a device, use a file in /proc
3) Implement a new syscall
4) Open a TCP/IP connection to/from your daemon (localhost) 
5) Open a named pipe to/from your daemon
6) Send signals to eachother

I think that from interrupt-context, 6) is the only way to go for sending
the "new" route. Returning the value is always process-context, so any of
the above can be used.

Greetings,
   Arjan van de Ven