[lwip-devel] [bug #20409] Add netif callback function for link change event

[Simon Goldschmidt]

Follow-up Comment #4, bug #20409 (project lwip):

> I think it should be an option, and not something "mandatory" if you don't
have such possibility...

You can make it like that: if the link is set up after initializing
(NETIF_FLAG_LINK_UP set), we can directly do all the stuff. If it's down
(NETIF_FLAG_LINK_UP not set) we can wait for the status callback to come. In
the satus callback, we can simply check the flag again.

About the driver return values: TCP will retry if the link is down, for UDP
you get back an error. Maybe we really should define a return value so
applications see this (we should have a look at opengroup.org and other OSes
what they return).

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