[PATCH] c-user: Document rtems_extension_create()

[Sebastian Huber]

On 17/04/2020 19:30, Gedare Bloom wrote:

> On Fri, Apr 17, 2020 at 2:11 AM Sebastian Huber
> <sebastian.huber at embedded-brains.de>  wrote:
>> Close #3953.
>> ---
>>   c-user/user_extensions.rst | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/c-user/user_extensions.rst b/c-user/user_extensions.rst
>> index c3bd1c6..89b86fd 100644
>> --- a/c-user/user_extensions.rst
>> +++ b/c-user/user_extensions.rst
>> @@ -466,6 +466,8 @@ DIRECTIVE STATUS CODES:
>>
>>        * - ``RTEMS_SUCCESSFUL``
>>          - extension set created successfully
>> +     * - ``RTEMS_INVALID_ADDRESS``
>> +       - ``table`` or ``id`` are NULL
> This is OK, I guess there are no other valid checks that are made on
> addresses usually.
>
> As we continue to improve our processes, it may be worth considering
> the use of well-defined regions and symbol ranges to provide
> additional sanity checks on address pointers, maybe.  I'm just
> ruminating.
Actually I think that all these NULL pointer checks are completely 
superfluous. However, since most RTEMS APIs have them I thought it would 
be consistent to add this also here.
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