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Re: [rtems] Tweaks to sys/features.h

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?


-----Original Message-----
From: []
On Behalf Of Ralf Corsepius
Sent: Thursday, November 20, 2008 12:08 AM
To: Newlib List
Subject: [rtems] Tweaks to sys/features.h

Hi again,

another RTEMS specific newlib patch, we'd like to see merged into

This patch address 2 issue with sys/features.h:
* POSIX/SUSv3 mandates _POSIX_MONOTONIC_CLOCK to be set to -1, 0 or
200112L. RTEMS supports _POSIX_MONOTONIC_CLOCK but doesn't support
sysconf(), so it must be set 200112L.

* RTEMS doesn't support _POSIX_SHARED_MEMORY_OBJECTS. The setting having
been used so far was wrong.


Joel Sherrill, Ph.D.             Director of Research & Development        On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
  Support Available             (256) 722-9985

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