"Muli B.Y." wrote:
>
> Thanks for the suggestions, Nimrod, I have implemented the
> online/offline thing this way. Shame on me for not having read the FAQ
> (where this stuff is mentioned) for quite some time.
>
> Nevertheless, it was a good excersize and my original question stands:
> Windows has RasConnectionNotification(). What does linux have except
> constant polling?
Oh well.. seems like I have to correct myself again ;)
Linux *does* support such notifications. Kernel 2.2 introduced Netlink
sockets and routing messages (these are compile-time options - look at
the networking options when you compile your kernel).
Your process will be notified of any routing table changes, interface
up/down events, etc. I believe you can ask to be notified of certain
events only. Not sure, though. It looks a bit complicated, and
definitely lacks good documentation but have a look at the 'iproute2'
package for an example. Get it from:
ftp://ftp.inr.ac.ru/ip-routing/
build it and try (as root):
/ip monitor all
now try on another terminal: '/sbin/ifconfig lo down' and look at the
monitor's output.
Still, it's a complicated solution and the process has to have NET_ADMIN
capabilities or root uid. Seems like this interface was designed
primarily for routing daemons.
-- Nimrod.
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