How to use the RTM_IFINFO message of a Routing Socket

[Ruslan Ermilov]

On Mon, May 10, 2004 at 09:02:51PM +0200, Juan Rodriguez Hervella wrote:
> Hello,
> 
> I dont understand, looking at "man 4 route", how to use the RTM_IFINFO
> message of a Routing Socket.
> 
> I mean, do I have to make a "write" on the socket with a 
> "struct if_msghdr" of type = RTM_IFINFO and later on a "read" with
> the same data structure ?
> 
> Or can I just open the PF_ROUTE socket and then make a "read" with 
> a "struct if_msghdr" data structure, w/out doing a "write" ?
> 
> I'm really lost, and I haven't found documentation about this topic, so 
> please if somebody can give me an example or pointing me to
> somewhere to learn to use this, I'd be delighted. Looking at 
> "usr/src/bin/route.c" is simple another big mess for me.
> 
> I'm looking forward to your answers, net-people !
> 
A kernel emits the RTM_IFINFO message on a routing socket by ether
reacting to the NET_RT_IFLIST sysctl(3), or when the interface's
status changes (see "route monitor" for one such example).


Cheers,
-- 
Ruslan Ermilov
ru at FreeBSD.org
FreeBSD committer
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