netdev - Re: [RFC] Enhance dev_ioctl to return <hwaddr>:<if_name::if

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Date:	Fri, 16 Jul 2010 12:40:31 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	chetanloke@...il.com
Cc:	shemminger@...tta.com, Chetan.Loke@...scout.com,
	bhutchings@...arflare.com, netdev@...r.kernel.org
Subject: Re: [RFC] Enhance dev_ioctl to return <hwaddr>:<if_name::if_index>
 mapping

From: Chetan Loke <chetanloke@...il.com>
Date: Fri, 16 Jul 2010 15:35:48 -0400

> Yes, I opened a socket and then sent the IFCONF ioctl.What I meant was
> that interfaces that didn't have an IP weren't returned.

If you use the correct set of ioctl()'s it will, just as
"/sbin/ifconfig -a" lists all interfaces regardless of whether they
have IP addresses.

Run strace on 'ifconfig', see what it does :-)

And then you also have the option of using netlink as well.
This is how "ip l l" lists all interfaces, also regardless of
configuration.
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