netdev - Re: [PATCH v2] net: introduce helper macro for_each

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Message-Id: <20141210.204703.1525194278635097457.davem@davemloft.net>
Date:	Wed, 10 Dec 2014 20:47:03 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	guz.fnst@...fujitsu.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	joe@...ches.com
Subject: Re: [PATCH v2] net: introduce helper macro for_each_cmsghdr

From: Gu Zheng <guz.fnst@...fujitsu.com>
Date: Thu, 11 Dec 2014 09:05:59 +0800

> IMO, the user-land programs need to be build with the matched
> headers separately.

You absolutely cannot provide this new interface to userland and
expect programs to be able to just use it, it's non-standard and does
not exist in older headers.

I do not want this new interface available to userland programs.
They can just open-code the list traversal just like every program
in history has had to do since BSD UNIX.
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