Re: [PATCH v2] net: introduce helper macro for_each_cmsghdr

From: Gu Zheng <redacted>
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.