On Tue, Apr 19, 2005 at 03:00:04PM -0700, Linus Torvalds wrote:
> On Tue, 19 Apr 2005, Greg KH wrote:
> > It looks like your domain name isn't set up properly for your box (which
> > is why it worked for you, but not me before, causing that patch).
> No, I think it's a bug in your domainname changes. I don't think you
> should do the domainname at all if the hostname has a dot in it.
> Most machines I have access to (and that includes machines that are
> professionally maintained, not just my own cruddy setup) says "(none)" to
> domainname and have the full hostname in hostname.
> And even the ones that use domainname tend to not have a fully qualified
> DNS domain there. You need to use dnsdomainname to get that, and I don't
> even know how to do it with standard libc.
> So how about something like this?
> (Somebody who actually knows how these things should be done - please feel
> free to pipe up).
The glibc documentation blows for this, but what getdomainname comes
from uname(2), not from any DNS-related configuration. Debian only
ever sets this if you're using NIS.
There's no real great way to get the current hostname; a lot of
applications do a reverse DNS lookup on the primary network interface,
with appropriate handwaving to define primary.
Easiest might be to punt to hostname --fqdn, or an equivalent to its
algorithm - which appears to be fetch the hostname from uname, do a DNS
lookup on that, and a reverse DNS lookup on the result.
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