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Date: Tue, 13 Mar 2007 15:51:45 +0100 (CET)
From: "M. Koehrer" <mathias_koehrer@domain.hid>
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Subject: [Xenomai-help] Howto catch SEGV signals in Xenomai
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Hi all,

I have a problem to catch segment violations with Xenomai:
For demonstration I use the following program:
------------------------------------------
#include <stdio.h>
#include <sys/mman.h>

#include <native/task.h>
#include <native/sem.h>
RT_TASK taska_desc;
volatile int *pointer =3D 0;

void mytaska(void *cookie)
{
    int i;
    for (i=3D0; i < 50; i++)
    {
        rt_task_sleep(50000000);
        if (i > 20)
        {
            *pointer =3D 123;
        }
        printf("Hello %i\n", i);
    }
    printf("Hi, this is task A\n");
}

int main(void)
{
    mlockall(MCL_CURRENT|MCL_FUTURE);

    rt_task_create(&taska_desc, "mytaska", 0, 81, T_JOINABLE);
    rt_task_start(&taska_desc, &mytaska, NULL);

    rt_task_join(&taska_desc);
    printf("Main: A joined\n");

    return 0;
}
---------------------------------------
Whenever i is greater than 20 a segment violation occurs, as I must not wri=
te
to address 0 (the pointer is always NULL).
However, what happens is, that my system freezes after printing out 18 or 1=
9.
I have to reset the PC to continue.
When I write a printf() directly before the invalid assignment I get the us=
ual linux
"segmentation fault" error message.

How can I catch a signal in a Xenomai real time task?

I am running Xenomai 2.3.0 + NOCOW patch.

I have enclosed the .c file and a Makefile in a .tgz file.

Thanks for any feedback on that issue

Regards

Mathias
~
~



--=20
Mathias Koehrer
mathias_koehrer@domain.hid


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