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Date: Tue, 17 Mar 2009 20:01:31 +0100
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-core] [PATCH] posix: Fix error checks when copying
 user strings
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To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: xenomai-core <xenomai@xenomai.org>

Jan Kiszka wrote:
> Gilles Chanteperdrix wrote:
>> Jan Kiszka wrote:
>>> Gilles Chanteperdrix wrote:
>>>> Jan Kiszka wrote:
>>>>> Obviously a conversion error while switching to __xn_safe*.
>>>>>
>>>>> Signed-off-by: Jan Kiszka <jan.kiszka@domain.hid>
>>>> Well, I have just checked the kernel code, and 0 as a return value of
>>>> strncpy_from_user is treated as a value in most places, even if not -EFAULT.
>>>>
>>> Better check our code: :) __xn_safe_strncpy_from_user works differently.
>> Then I would tend to consider that xn_safe_strncpy is broken.
> 
> No, because it not a derivate of strncpy_from_user, but an internal
> service optimized for the most common use cases (where you don't care
> about the precise return value).

So, what should I call if I care about the return value ?

-- 
                                                 Gilles.