Re: need for notifier chains?

["Ratnadeep Joshi" <ratn.josh@xxxxxxxxx>]

A notifier chain is basically a chain of callback functions that are called when a corresponding event has occurred. Events can vary from addition a hoplug cpu to assignment of a network address.
There is a chain corresponding to each such event. Any one interested for an event registers a callback function into the corresponding chain by calling notifier_chain_register.

Have a look at this:
net/ipv6/addrconf.c
--------------------------------------snip------------------------
int register_inet6addr_notifier(struct notifier_block *nb)
{
        return notifier_chain_register(&inet6addr_chain, nb);
}
--------------------------------------snip------------------------

Regards,
- Ratnadeep

On 5/8/07, pradeep singh < 2500.pradeep@xxxxxxxxx> wrote:

Hi All,

While going through the code in kernel/sys.c and
include/linux/notifier.h , i came across notifier chains in kernel
2.6.20.1 .

What are notifier chains exactly and why do we need them in the networking code?
Is it a generic callback list? Or is it specific to the networking stack?

Any help?

Thanks
~psr
--
play the game

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