RFC: first attempt at -a for Unix domain sockets

[Geoff Simmons]

Hello all,

This commit on a fork of Varnish is a first stab at implementing UDS
as a listen address:

https://github.com/slimhazard/varnish-cache/commit/881a18613ceb86be5eca721200667d4bb0f20cf6

I've written some notes in the Wiki about issues that I think are
worth attention:

https://github.com/slimhazard/varnish-cache/wiki/First-implementation-of-listen@UDS

This is *not* a full-blown implementation of UDS for Varnish, and far
from everything foreseen in VIP17. But rather an effort to find out
what needs to be done as a basis for discussion and criticism.

It does successfully listen to a UDS and respond to requests, and adds
no additional space requirements to session workspace (the Wiki
explains how that works). It also passes 'make check' (although no
tests have been added yet for UDS).

So your comments are very much welcome.


Thanks,
Geoff
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