Mail Archives: cygwin/2009/11/24/04:25:37
On Nov 23 13:20, Christopher Faylor wrote:
> On Mon, Nov 23, 2009 at 10:07:05PM +0800, Huang Bambo wrote:
> >There's some diffirence between cygwin and other *nix:
> >In other *nix with this condition, those ended child process could be
> >list by ps command with <defunc>tag, will you fix it?
>
> Cygwin should produce zombie processes. You don't see zombie processes
> if the child has exited and the parent goes away though. In that case
> the process just disappears, just like on linux.
>
> You *should* see a zombie when the parent is alive by not waiting for
> children.
Hmm, but you don't. Huang's example code forks a child and the parent
returns to the select loop without reaping the child via wait. When the
child exits after its 3 second sleep, the handle to the child process
does not get closed, and the cygpid shared memory regions for the child
pid still exists. But the process list does not show the child process
at all. Nor will you find it in /proc.
That's not a regression, though. The same occurs in 1.5.25. However,
I have a vagure memory that we really saw zombies in the process list
way back when.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat
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