Re: [Lse-tech] Re: A common layer for Accounting packages

Evgeniy Polyakov
2005-02-28T07:59:11Z

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On Sun, 2005-02-27 at 23:39 -0800, Andrew Morton wrote:
> Guillaume Thouvenin <guillaume.thouvenin@bull.net> wrote:
> >
> > Ok the protocol is maybe too "basic" but with this mechanism the user
> > space application that uses the fork connector can start and stop the
> > send of messages. This implementation needs somme improvements because
> > currently, if two application are using the fork connector one can
> > enable it and the other don't know if it is enable or not, but the idea
> > is here I think.
>
> Yes. But this problem can be solved in userspace, with a little library
> function and a bit of locking.
>
> IOW: use the library to enable/disable the fork connector rather than
> directly doing syscalls.
>
> It has the problem that if a client of that library crashes, the counter
> gets out of whack, but really, it's not all _that_ important, and to handle
> this properly in-kernel each client would need an open fd against some
> object so we can do the close-on-exit thing properly. You'd need to create
> a separate netlink socket for the purpose.

Why dont just extend protocol a bit?
Add header after cn_msg, which will have get/set field and that is all.
Properly using seq/ack fields userspace can avoid locks.

--
Evgeniy Polyakov

Crash is better than data corruption -- Arthur Grabowski

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