[PATCH] vprintf: Add handler that mutes all output.

[Chris Johns]

On 22/03/2018 18:22, Christian Mauderer wrote:
> Am 22.03.2018 um 08:17 schrieb Chris Johns:
>> On 22/03/2018 17:40, Christian Mauderer wrote:
>>> This adds a vprintf handler that can be used to suppress all outputs of
>>> the libbsd.
>>
>> Why would I want this?
>>
>> How would I enable the output so I could see it, for example when working with
>> the code?
>>
>> Chris
>>
> 
> Hello Chris,
> 
> in this case, a customer asked for no additional output on the console.
> It would be easy to add the same to the application but it might can be
> useful for other users too therefore I added it to libbsd.
> 
> Note that this is fully optional. It doesn't change the default
> behavior. You explicitly have to set the handler using a
> 
>     old = rtems_bsd_set_vprintf_handler(rtems_bsd_vprintf_handler_mute);
> 
> If you want to re-enable the output sometime later you could just set
> the vprintf handler to the old one again (return value of the set function).
> 

Nice, I can see the need.

We really need a manual for libbsd or a section in the User Manual. Is it worth
adding something to libbsd.txt until we have somewhere so we do not forget to
document this?

Ok to push.

Thanks
Chris