Re: 7.4Beta1 "failed to create socket: Address family not

My original commit had a message stating it was an IPv6 and the kernel
didn't support it. I don't see that message in CVS anymore, but I think
we need something similar.

There was a big discussion over whether we should require IPv6 to be
enabled individually, and then throw a hard error if IPv6 fails, but at
this stage, it seemed best to most to just try IPv6 and soft-fail, while
throwing a message in the server logs.

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Tom Lane wrote:
> Robert Creager <Robert_Creager(at)LogicalChaos(dot)org> writes:
> > Aug 10 14:11:27 thunder postgres[18613]: [1-1] LOG: failed to create
> > socket: Address family not supported by protocol
>
> It's normal for this to happen if you have userland (libc) code that
> supports IPv6 but your kernel isn't configured to do so. The postmaster
> will try to create both IPv4 and IPv6 sockets, because getaddrinfo()
> told it to, but the IPv6 attempt will fail as above.
>
> However, I can see that this is going to become a FAQ if we leave the
> behavior alone. I am wondering if we can suppress this message without
> making life difficult for people who are trying to debug actual problems
> in setting up sockets.
>
> We could just ignore EAFNOSUPPORT failures, but I'm not sure if there
> are any cases where such an error would genuinely be interesting.
> Another possibility is to issue the per-failure messages at a very low
> level (DEBUG2 maybe) and only LOG when we can't create any socket at
> all. Perhaps there are better answers. Any ideas?
>
> regards, tom lane
>

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