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Date: Sun, 04 Nov 2012 17:30:56 +0100
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai] rt_task_create fails when running over ssh
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To: Andrey Nechypurenko <andreynech@googlemail.com>
Cc: xenomai@xenomai.org

On 11/04/2012 05:13 PM, Andrey Nechypurenko wrote:

> On 3 November 2012 22:34, Gilles Chanteperdrix
> <gilles.chanteperdrix@xenomai.org> wrote:
>> On 11/03/2012 10:32 PM, Andrey Nechypurenko wrote:
>>
>>>> Use the DESTDIR environment variable (you can look inside xeno-config to
>>>> see how it works, it should be pretty obvious).
>>>
>>> Thanks for the hint. I'll definitely try. However I doubt that it
>>> would solve the issue with rt_task_create() since I were actually
>>> copy-pasting the output from xeno-config and only change the -I and -L
>>> flags to reflect my directory structure.
>>
>>
>> Yes, I also doubt that very much. What about the arm/thumb issue?
> 
> I've run strace and found the following line in the output when
> starting the programm over ssh:
> sched_setscheduler(440, SCHED_FIFO, { 99 }) = -1 EPERM (Operation not permitted)
> I assume, that this call is the part of rt_task_create(). In contrast,
> the same call gets no errors if running in the serial console. Really
> strange to me.
> 
> My attempts to change corresponding priorities with ulimit command or
> setrlimit() function does not solve the issue. So it seams like ssh
> server limits some permissions somehow which causes rt_task_create()
> to fail.


You can run ulimit to check the current limits.
And it would be interesting to run the "whoami" command or use getuid()
in the program to check whether you are really running as the root user.

-- 
                                                                Gilles.