Re: [Xenomai-help] rt_task_shadow returns always -EFAULT

[Philippe Gerum <rpm@xenomai.org>]

On Fri, 2009-07-17 at 13:17 +0200, Petr Cervenka wrote:
> >On Thu, 2009-07-16 at 15:15 +0200, Petr Cervenka wrote:
> >> Hello,
> >> the xenomai native function rt_task_shadow(...) always returns -EFAULT for me. Only happens in xenomai-2.5-rc2.
> >> 
> >> Same behaviour was also in 2.5-rc1, see note in my older post:
> >> https://mail.gna.org/public/xenomai-help/2009-05/msg00024.html
> >> 
> >> Example code, in the end of this post:
> >> https://mail.gna.org/public/xenomai-help/2009-05/msg00038.html
> >> 
> >> My configuration:
> >> Athlon 64 X2 4600+
> >> Kubuntu 7.10
> >> linux-2.6.29.5 (also tried 2.6.30.1)
> >> xenomai-2.5.-rc2
> >
> >Does this still break when the name is passed as illustrated below?
> >
> 
> No, it doesn't help.
> 
> I also tried the xenomai rtprint example -> same behavior. The rt_task_shadow() returns -EFAULT and any following rt_task_sleep() in that task returns -1. The other task works fine.
> I will do some deeper examination of rt_task_shadow() code.
> If you have any advices, what to send or what to try, i would like to hear it.
> 

Try instrumenting ksrc/skins/native/syscall.c, __rt_task_create(), to
identify which spot returns -EFAULT. I can't reproduce this issue on a
ppc target; I may try over x86 later, but this would speed up things if
you could spot the failing test before I'm able to switch to this.

> >--- petr.c~	2009-07-16 15:50:46.000000000 +0200
> >+++ petr.c	2009-07-16 16:28:31.000000000 +0200
> >@@ -14,11 +14,12 @@
> >     RT_EVENT event;
> >     unsigned long mask;
> >     RTIME start, end;
> >+    char name[32];
> >     int res;
> > 
> >     mlockall(MCL_CURRENT | MCL_FUTURE);
> > 
> >-    res = rt_task_shadow(&mainTask, "main_task", MY_PRIORITY, 0);
> >+    res = rt_task_shadow(&mainTask, strcpy(name, "main_task"), MY_PRIORITY, 0);
> >     if (res < 0) {
> >         printf("rt_task_shadow(): %d (%s)n", res, strerror(-res));
> >     }
> >
> >> 
> >> Best regards
> >> 
> >> Petr Cervenka
> >> 
> >> _______________________________________________
> >> Xenomai-help mailing list
> >> Xenomai-help@domain.hid
> >> https://mail.gna.org/listinfo/xenomai-help
> >-- 
> >Philippe.
> >
> >
> Petr
-- 
Philippe.