5034718: better messages for e.g. BindException

[Arnout Engelen]

Hi,

Many networking exception messages just channel the low-level errno (e.g.
'Address already in use'). It would be really nice if some more context was
provided - such as, *which* address was already in use.

Attached is a rough sketch of how we could include more detailed
information in the messages for those failures. I'd love any feedback
before I dig deeper!


Kind regards,

Arnout
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