[Xenomai-help] binding without root access..

[Xenomai-help] binding without root access..

[Kim Chuan Lim]

Hi all,

Xenomai: binding failed: Operation not permitted.

Is it possible for me to do the binding without switching to root?

Regards,
Kim Chuan.

Re: [Xenomai-help] binding without root access..

[Jan Kiszka]

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Kim Chuan Lim wrote:
> Hi all,
> 
> Xenomai: binding failed: Operation not permitted.
> 
> Is it possible for me to do the binding without switching to root?

Switch off XENO_OPT_SECURITY_ACCESS, but you will likely run on other
barriers later (like the number of mlock'able pages, essential for RT).
What is your motivation to run RT apps as non-root?

Jan


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Re: [Xenomai-help] binding without root access..

[Kim Chuan Lim]

Hi Jan,

I try to run some old example from http://www.captain.at/xenomai.php
I am getting feddup with some examples which keep on hanging my system.
I thought maybe if i run the old examples with normal user mode, i
will not crash the system.

Between, the examples program in testsuits are too much complicated
for beginner like me.
Is there any up to date and easy understandable examples?

Regards,
Kim Chuan



On 7/11/06, Jan Kiszka <jan.kiszka@domain.hid> wrote:
> Kim Chuan Lim wrote:
> > Hi all,
> >
> > Xenomai: binding failed: Operation not permitted.
> >
> > Is it possible for me to do the binding without switching to root?
>
> Switch off XENO_OPT_SECURITY_ACCESS, but you will likely run on other
> barriers later (like the number of mlock'able pages, essential for RT).
> What is your motivation to run RT apps as non-root?
>
> Jan
>
>
>
>

Re: [Xenomai-help] binding without root access..

[Jan Kiszka]

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Kim Chuan Lim wrote:
> Hi Jan,
> 
> I try to run some old example from http://www.captain.at/xenomai.php
> I am getting feddup with some examples which keep on hanging my system.
> I thought maybe if i run the old examples with normal user mode, i
> will not crash the system.

Every program with RT power can hang your system: in an endless loop
with raise priority. That's why it's not that simple to allow non-root
RT access.

> 
> Between, the examples program in testsuits are too much complicated
> for beginner like me.
> Is there any up to date and easy understandable examples?

What about ksrc/skins/native/snippets/? They may not run but they can
give some ideas. Here is one of the simplest that does run (my classic
version):

#include <signal.h>
#include <sys/mman.h>
#include <native/task.h>

void demo(void *arg)
{
    rt_task_set_periodic(NULL, TM_NOW, 200000);
    while (1) {
        rt_task_wait_period(NULL);
        /* real-time jobs */
    }
}

void catch_signal(int sig) { }

int main(int argc, char* argv[])
{
    RT_TASK demo_task;

    signal(SIGINT, catch_signal);
    mlockall(MCL_CURRENT|MCL_FUTURE);
    rt_task_create(&demo_task, "mydemo", 0, 99, 0);
    rt_task_start(&demo_task, &demo, NULL);
    pause();
    rt_task_delete(&demo_task);
    return 0;
}

Jan


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Re: [Xenomai-help] binding without root access..

[Hannes Mayer]

Kim Chuan Lim wrote:
> Hi Jan,
> 
> I try to run some old example from http://www.captain.at/xenomai.php

An old fusion example ?
Make sure you read:
http://www.captain.at/xenomai-porting-fusion.php
As you can see, porting (simple) examples from fusion to xeno is pretty
straightforward.

Best regards,
Hannes.