libbsd: React to link status change events

[Jan.Sommer at dlr.de]

Thanks. I will have a look.

> -----Original Message-----
> From: Sebastian Huber <sebastian.huber at embedded-brains.de>
> Sent: Thursday, April 29, 2021 1:46 PM
> To: Sommer, Jan <Jan.Sommer at dlr.de>; users at rtems.org
> Subject: Re: libbsd: React to link status change events
> 
> On 29/04/2021 13:43, Jan.Sommer at dlr.de wrote:
> 
> > is there an easy way to register a callback function or block until a link status
> change of an Ethernet device occurs in the libbsd stack?
> > Searching for it, I found some references for EV_NETDEV in kqueue, but
> this seems to be a legacy function which has been removed years ago.
> >
> > In the console of the Zedboard, for example, I see those events as info
> statements, but haven't found an API to hook into that:
> >
> > info: lo0: link state changed to UP
> > info: cgem0: link state changed to DOWN
> > info: cgem0: link state changed to UP
> You can look at the dhcpcd code to figure out how this works. I think a
> routing socket can be used to get these events.
> 
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