> You get ENOBUFS, which SUS says you should not get with blocking I/O.

Yes, I think this needs fixing.  But pushing blocking behaviour down to
the link layer does not sound to me like the right way to fix it.

> If we consider that what SUS does not talk about what happens in the
> link layer, then IMO, we should let the link layer drop packets
> without returning ENOBUFS.

We could.  But I'm not sure I wouldn't prefer to continue to return
ENOBUFS as a hint to the upper layer, a hint which UDP sockets would
throw away but which other upper layers, things like the TCP stack
maybe, might do something useful with.

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