Re: [Xenomai-core] xenomai 2.5.3/native, kernel 2.6.31.8 and fork()

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

Krzysztof Błaszkowski wrote:
> On Wed, 2010-08-18 at 00:59 +0200, Gilles Chanteperdrix wrote:
>> - I have not really checked your user-space compilation flags, I am
>> using xeno-config to get the correct ones.
> 
> xeno-config --skin=native --cflags gives:
> 
> -I/usr/xenomai/include -D_GNU_SOURCE -D_REENTRANT -Wall -pipe -D__XENO__
> 
> 
> note that there is no xenomai installed on my r&d server
> in /usr/xenomai/
> 
> i build xenomai per kernel and install it in kernel's INSTALL sub-dir
> (DESTDIR=) as well as kernel's modules and other related stuff for this
> particular kernel.
> (otherwise i would go mad soon due to various versions ..)

xeno-config handles the DESTDIR environment variable (failing to do this
would be kind of silly, because a lot of people, including the
maintainers, use Xenomai mostly in cross-compiled environment).

> xeno-config --skin=native --ldflags gives:
> 
> -lnative -L/usr/xenomai/lib -lxenomai -lpthread
> 
> and indeed i missed libpthread but otoh userland without pthread even
> does not depend directly on pthreads:
> 
> ldd xeno-shmem-fork
> 	linux-gate.so.1 =>  (0xffffe000)
> 	libnative.so.3 => not found
> 	libxenomai.so.0 => not found
> 	libc.so.6 => /lib/libc.so.6 (0xf7da5000)
> 	/lib/ld-linux.so.2 (0xf7f10000)
> 
> when compiled without pthreads.

libnative depends on pthread, if ldd had been able to find libnative, it
 would have found the dependency on libpthread.


>> - your user-space code was missing #include <unistd.h>
> 
> i added. it changed nothing.

Ok, with all other changes I assume?

>> - some subtle difference in the glibc
> 
> hmm, i'd say that is rather out my control. i use by default opensuse
> for r&d.
> 
> does this mean that this distro is broken ?
> 
> (otoh many things are - especially gnome)

What version of opensuse? If several toolchains are available, which one
are you using? I do not mean to say that the glibc is broken, only that
xenomai could use it in a way that breaks with the version you are using.

>> In any case, without further information, it is hard for me to dig any
>> further tonight. Regards.
> 
> i see. want you me to send .config file ? anything else ?

Run cat /proc/ipipe/version /proc/xenomai/version, uname and "getconf
GNU_LIBPTHREAD_VERSION" on the target, in order to get sure that you run
the versions you think you are running. Then please send your .config.

Please also send a full kernel log, from the boot, up to the bug.

-- 
					    Gilles.