Re: [Xenomai-help] Some problems with shared memory

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

roderik.wildenburg@domain.hid wrote:
>> All I want to hear is "yes, we ran the shm test without Xenomai, on
>> exactly the same kernel, on the same platform, and the shm 
>> test worked".
>> Because Xenomai runs plain Linux mmap under the hood and do no
>> particular check on the mmap length. So, the problem is either that
>> Linux mmap on that particular machine with that particular 
>> kernel does a
>> check on length, or that there is a subtle bug somewhere that I do not
>> want to investigate until I am usre that it is real.
> 
> 
> yes, we ran the shm test without Xenomai, on
> exactly the same kernel, on the same platform, and the shm 
> test worked.
> 
> This means : 
> I took a plain 2.4.25 PPC-Kernel and started killtest without pagealigned shm size and got the error message :
> shm_open fails. errno=38 SHM:/testshm
> shm_open: Function not implemented
> 
> Therefore I mounted a tmpfs on /dev/shm and killtest ran without any errormessage.
> To make shure the missing /dev/shm isn´t the reason for the mmap-error I took a xenomai-enhanced kernel, mounted /dev/shm and run (a xenomai-linked) killtest, but I still got the error :
> killtest2 # ./killtest -c
> createshm mmap: No such device or address
> shmsize = 100000; errno : 6 == Failed to create shm : -3
> killtest user exit !
> 
> This I tried with Xenomai 2.3.5 and 2.4.7 (and got the same error).
> Even on a Xenomai-enhanced kernel a killtest, which was linked without Xenomai-libraries, run without error.
> 
> Sorry for not having better news
> Roderik

Hi,

this should have been fixed in the 2.4.8 release, so please test it and
tell us whether it works for you.


-- 
					    Gilles.