From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?ISO-8859-1?Q?Roger_Pau_Monn=E9?= <roger.pau@citrix.com>
Subject: Re: [PATCH RFC 03/23] include: import FreeBSD headers
 for evtchn and privcmd devices
Date: Tue, 22 Apr 2014 16:35:37 +0200
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To: Ian Jackson <Ian.Jackson@eu.citrix.com>
Cc: xen-devel@lists.xenproject.org, Ian Campbell <ian.campbell@citrix.com>
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On 17/04/14 18:16, Ian Jackson wrote:
> Roger Pau Monne writes ("[PATCH RFC 03/23] include: import FreeBSD header=
s for evtchn and privcmd devices"):
>> Signed-off-by: Roger Pau Monn=E9 <roger.pau@citrix.com>
>> Cc: Ian Jackson <Ian.Jackson@eu.citrix.com>
>> Cc: Ian Campbell <ian.campbell@citrix.com>
> =

> Is it usual, then in the FreeBSD world, for an application program to
> take a copy of kernel headers defining ioctls etc. ?  This seems
> surprising to me.  It would seem more sensible for the application to
> use the headers installed on the build host.

I would say it's certainly not common, but every OS with Dom0 support
seems to do it (take a look at tools/include/xen-sys).

Not sure if this was done in the past to allow compiling the toolstack
on a host without a xen-classic kernel (which I guess was the only one
to have the proper headers for user-space devices).

Roger.