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Date: Tue, 03 May 2011 13:00:50 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-help] message pipe message boundaries
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To: dietmar.schindler@domain.hid
Cc: xenomai@xenomai.org

On 05/03/2011 10:15 AM, dietmar.schindler@domain.hid wrote:
>> From: xenomai-help-bounces@domain.hid
> [mailto:xenomai-help-bounces@domain.hid]
>> On Behalf Of dietmar.schindler@domain.hid
>> Sent: Friday, April 29, 2011 8:31 AM
>> Cc: xenomai@xenomai.org
>> Subject: Re: [Xenomai-help] message pipe message boundaries
>>
>>> From: Philippe Gerum [mailto:rpm@xenomai.org]
>>> Sent: Wednesday, April 27, 2011 11:43 PM
>>>
>>> On Wed, 2011-04-27 at 14:22 +0200, dietmar.schindler@domain.hid
>>> wrote:
>>>> ... Wouldn't it be desirable to implement the
>>>> readv file operation in the rtpipe driver so that the guarantee
> "One
>>>> read() per rt_pipe_write()" could cover readv(2) also?
>>>
>>> No objection to merge this. Patch welcome.
>>
>> Well, I'll try to come up with one.
> 
> We at manroland now use (with Xenomai 2.4) the attached patch, which
> implements the readv file operation in the rtpipe driver so that the
> assertion "One read() per rt_pipe_write()" (message boundaries
> preserved) covers readv(2) also.
> 

I think implementing the readv method is sufficient, you do not need to
implement both readv and read.

-- 
                                                                Gilles.