From: Ulrich Drepper <drepper@redhat.com>
Date: Wed, 19 Sep 2007 09:49:09 -0700

quoted text
> But the spec calls for a "null address" to be used and that's in my
> understanding something different from using AF_UNSPEC.

It just occured to me that AF_UNSPEC might be used simply
because "all zeros" might be a valid real bindable address
for some address family.  And using AF_UNSPEC avoids that
problem entirely.
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