[rtems] Tweaks to sys/features.h

[Joel Sherrill]

Howland Craig D (Craig) wrote:
>      _SC_SHARED_MEMORY_OBJECTS is the sysconf() identifier that goes
> with
> _POSIX_SHARED_MEMORY_OBJECTS.  They are in libc/sys/linux/sysconf.c.
>   
Thanks.  I have a patch waiting for our sysconf() once
Ralf's patch with this -1 is committed. :)

--joel

> 					Craig
>
> -----Original Message-----
> From: Joel Sherrill [mailto:joel.sherrill@oarcorp.com] 
> Sent: Thursday, November 20, 2008 1:33 PM
>
> Howland Craig D (Craig) wrote:
>   
>> Wouldn't it be better to define _POSIX_SHARED_MEMORY_OBJECTS with
>>     
> value
>   
>> -1 than to have it not defined?  That way it is known at compile time
>> that there is no support, rather than needing to wait for runtime for
>>     
> a
>   
>> sysconf() call.
>>   
>>     
> If that's what people are expecting to test for then yes.
>
> And FWIW RTEMS supports sysconf() but doesn't have
> a lot of cases in its implementation.  What sysconf value
> covers this one?
>
> --joel
>   


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Joel Sherrill, Ph.D.             Director of Research & Development
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