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List:       busybox
Subject:    RE: SIGTERM is not killing udhcpc
From:       Bryan Evenson <bevenson () melinkcorp ! com>
Date:       2014-05-21 19:40:15
Message-ID: ec99499aab73467b8bf25b8e468aea6d () BLUPR05MB037 ! namprd05 ! prod ! outlook ! com
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Laurent,

> -----Original Message-----
> From: busybox-bounces@busybox.net [mailto:busybox-
> bounces@busybox.net] On Behalf Of Laurent Bercot
> Sent: Wednesday, May 21, 2014 3:00 PM
> To: busybox@busybox.net
> Subject: Re: SIGTERM is not killing udhcpc
> 
> 
> > On my system I modified networking/ifupdown.c to call "kill -9" instead of
> "kill" to kill udhcpc (lines 539 and 617) and now udhcpc stops as expected
> when I bring the related interface down.  However, I've been through
> networking/udhcp/dhcpc.c and I don't see any obvious reason why it won't
> respond to a standard kill command.  Anyone see a reason why this would
> happen?
> 
> Can you please strace udhcpc, then send it a SIGTERM, and post the output
> of the strace ? It will show where udhcpc is blocking after receiving the signal.
> 

Of course now I can't reproduce the problem.  On my system the only thing that I \
changed with Busybox was adding "kill -9" to ifdown, which doesn't change any of the \
udhcpc code but a standard kill will now bring down udhcpc.  I have a separate \
machine that was running the same version of Busybox before my patch and SIGTERM \
kills udhcpc on that machine.  The only time I was able to produce the problem is on \
a machine that no longer exhibits the problem.

Unless I can reproduce the problem I'm going to assume that there was some \
unreproducible oddity with my machine that has now been fixed by reinstalling \
Busybox.  Sorry for the noise.

Bryan

> --
> Laurent
> 
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