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

[Oliver Endriss <o.endriss@gmx.de>]

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 */
                                   ^^^^^^^^^^^^^^^^^
:-)

Oliver
   


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