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Date: Thu, 12 Apr 2001 13:18:07 -0700
From: Andrew Morton <andrewm@uow.edu.au>
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To: Alan Cox <alan@lxorguk.ukuu.org.uk>
CC: Rod Stewart <stewart@dystopia.lab43.org>, linux-kernel@vger.kernel.org,
        Jeff Garzik <jgarzik@mandrakesoft.com>
Subject: Re: 8139too: defunct threads
In-Reply-To: <3AD5F9FE.9A49374D@uow.edu.au> from "Andrew Morton" at Apr 12, 2001 11:54:54 AM <E14nmpr-0001KH-00@the-village.bc.nu>
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Alan Cox wrote:
> 
> > <slaps head> swapper doesn't know how to reap children, and
> > AFAIK there's no way for a kernel thread to fully clean itself
> > up.  This is always done by the parent.
> 
> Make daemonize() move threads with parent 0 to parent 1

Reparenting would require diving inside this lot:

        /* 
         * pointers to (original) parent process, youngest child, younger sibling,
         * older sibling, respectively.  (p->father can be replaced with 
         * p->p_pptr->pid)
         */
        struct task_struct *p_opptr, *p_pptr, *p_cptr, *p_ysptr, *p_osptr;
        struct list_head thread_group;

plus maybe rewriting pgrps, sessions, gids, etc.  Challenging.

Plus it would mean that the kernel requires, for its
correct operation, that process "1" is a child reaper.
Is this a good thing?
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