libbsd: React to link status change events

[Sebastian Huber]

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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