Re: [GIT PATCH] I2C and W1 bugfixes for 2.6.12-rc2

From: Daniel Jacobowitz <dan@debian.org>
Date: Apr 19, 2005, 22:27 UTC
Message-ID: <20050419222738.GA14566@nevyn.them.org>
In-Reply-To: <Pine.LNX.4.58.0504191449270.2274@ppc970.osdl.org>

On Tue, Apr 19, 2005 at 03:00:04PM -0700, Linus Torvalds wrote:

Show 22 quoted lines

> 
> 
> 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.

-- 
Daniel Jacobowitz
CodeSourcery, LLC