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Re: [Xen-devel] [PATCH] libxl: Include a version of bsd's queue.h

To: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] libxl: Include a version of bsd's queue.h
From: Christoph Egger <Christoph.Egger@xxxxxxx>
Date: Wed, 26 Oct 2011 10:14:46 +0200
Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On 10/25/11 19:58, Ian Jackson wrote:
Ian Jackson writes ("[Xen-devel] [PATCH] libxl: Include a version of bsd's 
queue.h"):
We would like some linked list macros which are (a) well known to be
sane and (b) typesafe.  BSD's queue.h meets these criteria.

The files in this changeset were obtained with:
   svn co -r 221843 svn://svn.freebsd.org/base/head/sys/sys/
   svn co -r 221843 svn://svn.freebsd.org/base/head/share/man/man3

I posted this because I noticed (too late) that libxl_qmp.c includes
<sys/queue.h>  and uses some macros that are only available in some
queue.h versions.  This is not ideal for portability of course.

I think it would be good to include this massaged queue.h and use it
in libxl_qmp.c.

These headers cause build errors on *BSD due to collisions with the
native headers. Two solutions:

- Only use them on platforms where they do not exist
- Add a namespace prefix to the macros and use them consequently

Christoph


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