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Date:	Fri, 18 Jan 2013 14:36:35 +0000
From:	Pedro Alves <palves@...hat.com>
To:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
CC:	"Carlos O'Donell" <carlos@...temhalted.org>,
	Mike Frysinger <vapier@...too.org>,
	David Miller <davem@...emloft.net>, libc-alpha@...rceware.org,
	bhutchings@...arflare.com, amwang@...hat.com, tmb@...eia.org,
	eblake@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, libvirt-list@...hat.com,
	tgraf@...g.ch, schwab@...e.de
Subject: Re: Redefinition of struct in6_addr in <netinet/in.h> and <linux/in6.h>

On 01/18/2013 02:24 PM, YOSHIFUJI Hideaki wrote:

>>>> It's simple enough to move all of the __GLIBC__ uses into libc-compat.h,
>>>> then you control userspace libc coordination from one file.
>>>
>>> How about just deciding on a single macro/symbol both the
>>> kernel and libc (any libc that needs this) define?  Something
>>> like both the kernel and userland doing:
>>>
>>> #ifndef __IPV6_BITS_DEFINED
>>> #define __IPV6_BITS_DEFINED
>>> ...
>>> define in6_addr, sockaddr_in6, ipv6_mreq, whatnot
>>> #endif
> 
> Hmm, how should we handle future structs/enums then?
> For example, if I want to have in6_flowlabel_req{} defined in
> glibc, what should we do?

Include the glibc header first?  Or is this some other
use case?

The point wasn't that you'd have only one macro for all
structs/enums (you could split into __IPV6_IN6_ADDR_DEFINED,
__IPV6_SOCKADDR_IN6_DEFINED, etc.) but to have the kernel
and libc agree on guard macros, instead of having the kernel
do #ifdef __GLIBC__ and glibc doing #ifdef _NETINET_IN_H.

But as Carlos says, the devil is in the details, and
I sure am not qualified on the details here.

-- 
Pedro Alves

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