[linux-dvb] Re: Leftover kdvb-fe processes

[Holger Waechtler <holger@convergence.de>]

Oliver Endriss wrote:
> Régis Bossut wrote:
> 
>>Oliver Endriss wrote:
>> >Note that there is always a zombie fe process when vdr is running.
>> >Actually, a zombie process will be added each time the frontend is
>> >closed. This is a normal since zombie processes will not be removed
>> >until the parent process exits.
>>
>>I thought it was removed when the parent process acknowledges the
>>process end via the wait() function.
> 
> 
> Yes, but vdr does not wait() for the kernel thread...
> It doesn't even know that a kernel thread has been created. 
> Therefore, the cleanup will be performed when vdr exits.
> 
> Is there an equivalent for wait() which can be used in kernel space?
> 
> 
>>This can be changed by using sigaction(). If SA_NOCLDWAIT is set, and
>>sig equals SIGCHLD, child processes of the calling processes will not
>>be transformed into zombie processes when they terminate.
> 
> 
> kernel 2.4.19, /usr/include/asm/signal.h:
> #define SA_NOCLDWAIT 0x00000002 /* not supported yet */

I added a reparent_to_init() call after daemonize(). Please test and 
tell me if you still see the <defunct> kdvb-fe process.

Holger



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