Re: [Xenomai-help] Zombie user tasks

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

Mehmet Alphan Ulusoy wrote:
> Thanks for the prompt and informative reply. After reading about  
> signals and processes I have to admit that I didn't have a clear idea  
> on the concept when I was posting my initial question. Nevertheless  
> I've modified the code of the user space task as follows:
> 
> - signal handler sets flag when it's called.
> 
> - At the end of the initialization routine (main()):
> 
> ...
> while(!termFlag)
>      pause();
> 
> clean();
> 
> return;
> 
> }
> 
> 
> ensures that clean() is called only if SIGTERM is received and  
> termFlag is raised by the signal handler. (termFlag is an int).
> 
> Is this safe?

Yes, this should be Ok.

> 
> By the way, in my trials I've found out that ppid of the zombie task  
> is 1 (init). So does this mean that the parent of the task did not  
> call wait() properly and init is the new parent of the task? Even so,  
> shouldn't it be cleaned automatically by init?

It means that the zombie task's parent died before the zombie, so the
zombie got re-parented to init. it will be cleaned automatically by init
after some time.

-- 
                                                 Gilles.