Em Quarta 08 Fevereiro 2006 11:14, Jan Kiszka escreveu:
>> ...
>> Jan, actually I didn't like the /dev/zero hack. If someone else is
>> using /dev/zero it will result in a problem... I think it would be better
>> to
>
>Why? It isn't an exclusive device. And I'm only invoking open/close on
>the original instance (which even have no handlers associated, see
>drivers/char/mem.c), mmap gets overloaded.
I'm a little confused here. I noted you have made a backup of the
file_operations struct and private_data. So, I've concluded, wrongly, that
those handlers would be used by every process that called that open handler.
But, looking at the mem.c code, I think that those data (file_ops and
private_data) are different structs each time the user issues a call to open.
If that is true, I don't see any problem in using your approach. But I don't
see neither any needs for making that backup...
Rodrigo.
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