linux-kernel - Re: [PATCH] emit logging when a process receives a fatal signal

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Date:	Sun, 19 Nov 2006 07:13:44 +0000
From:	Oleg Verych <olecom@...wer.upol.cz>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
Cc:	Folkert van Heusden <folkert@...heusden.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] emit logging when a process receives a fatal signal

On Sun, Nov 19, 2006 at 12:24:14AM +0100, Jan Engelhardt wrote:
> 
> On Nov 18 2006 21:51, Oleg Verych wrote:
> >On Sat, Nov 18, 2006 at 08:30:02PM +0100, Jan Engelhardt wrote:
> >> >Then, who you think prints that "Killed" or "Segmentation fault"
> >> >messages in *stderr*?
> >> >[Hint: libc's default signal handler (man 2 signal).]
> >> 
> >> Please enlighten us on how you plan to catch the uncatchable SIGKILL.
> >
> >Here's question of getting information. Collecting information is
> >possible by `waitpid()' from parent process as Miquel noted.
> 
> Yes, that is true. However that would involve adding support for This 
> Situation to the parent process. Which is where it becomes tricky. Patch 
> /sbin/init, in case the daemon runs like everything else. Or patch 
> xinetd, in case it is run from within that. Or, ...
>   The 'problem' with the waitpid solution is that you would need to 
> patch every possible parent that may become the owner of The Sigkilled 
> Target.

I think this is pure userspace admin issue, one wrapper shell script
for not programmers.

I'm not sure about init, you've told. For example, in Debian daemons are
run by start-stop-daemon function in LSB package. And in proposed LSB
standard <http://refspecs.freestandards.org/LSB_3.1.0/LSB-Core-generic/>
portable start_daemon, killproc, pidofproc funcions are described.
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