Re: IPv6 patch

Greg Copeland wrote:
> On Mon, 2003-01-06 at 15:29, Peter Eisentraut wrote:
> > (2) A socket type is explicitly enabled for the server to use, and if
> > creation fails, server startup fails. It seems that the current code
> > falls back to IPv4 if IPv6 fails.
>
> IIRC, it allows it to fall back to IPv4 in case it's compiled for IPv6
> support but the kernel isn't compiled to support IPv6. If that is the
> case, admittedly, you seem to have a point. If someone compiles in v6
> support and their system doesn't have v6 support and it's been requested
> via run-time config, it's should fail just like any other.

Yes, right now, it is kind of a mystery when it falls back to IPv4. It
does print a message in the server logs:

LOG: server socket failure: getaddrinfo2() using IPv6: hostname nor servname provided, or not known
LOG: IPv6 support disabled --- perhaps the kernel does not support IPv6
LOG: IPv4 socket created

It appears right at the top because creating the socket is the first
thing it does. A good question is once we have a way for the user to
control IPv4/6, what do we ship as a default? IPv4-only? Both, and if
both, do we fail on a kernel that doesn't have IPv6 enabled?

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