Re: s6, listen(8), etc.

[Jonathan de Boyne Pollard]

Laurent Bercot:

how does the daemon know what fd corresponds to what use?
In the wild, it's generally a for() loop over the passed-in descriptors 
that checks each socket type.  In the wild, only one of any type is 
often the case.

"If AF_INET4 and SOCK_DGRAM, this must be my UDP4 socket."

That's how I patched dnscache and tinydns to work, too.  A simple set of 
socket_is() functions in the Bernstein socket library, and it is off and 
away.