On Fri, 2005-08-12 at 21:31 +0200, Jesper Juhl wrote:

> > 
> I've got a 4-way pSeries p550 running AIX 5.3 here : 
> 
> $ uname -s -M -p -v -r
> AIX 3 5 powerpc IBM,9113-550
> 
> Output from your program :
> 
> $ ./a.out
> Unknown return code!!
> Unknown return code!!
> Unknown return code!!
> Unknown return code!!
> Unknown return code!!
> Unknown return code!!
> sa_mask blocks sig
> 

Did you try my updated code (the one with the extra sleep?). Here's
another version where I output the unknown return code.  Funny that this
didn't print any other error message. Since the return codes should show
something else.

Please try the attached.

Thanks,

-- Steve