From ripley at stats.ox.ac.uk  Tue Apr 26 20:09:41 2005
From: ripley at stats.ox.ac.uk (ripley@stats.ox.ac.uk)
Date: Tue Apr 26 20:09:49 2005
Subject: [Rd] Ctrl-c crashes R when run as sudo (PR#7819)
Message-ID: <20050426180941.6D593A1DA@slim.kubism.ku.dk>

On Tue, 26 Apr 2005, Peter Dalgaard wrote:

> MSchwartz@medanalytics.com writes:
>
>>> Thanks you, however Marc omitted to mention that you need to type
>>> signal SIGINT
>>> before running the backtrace (bt), because gdb will catch the INT
>>> signal thus not leading to the desired crash and the backtrace just
>>> shows when you hit Ctrl-C, not what happens after. Only after the
>>> signal SIGINT you should get the crash (if at all).
> ...
>> Manuel, I should have asked earlier, but I presume that you installed
>> from source as I don't see RPMs for 2.1.0 yet?
>>
>> Marc
>
> The effect seem to have been neatly backported to 2.0.1 though...
>
> Gdb doesn't seem to help. If you run a ps while "sudo R" is running,
> you'll see something like this:
>
> root     30416  0.0  0.1  2356  252 pts/5    S+   19:48   0:00 sesh /usr/bin/R
> root     30417 10.0  7.2 18016 13860 pts/5   S+   19:48   0:01 /usr/lib/R/bin/exec/R
>
> What I suspect is happening is that the ^C kills the sesh process, but
> that in turn does not manage to kill R.

Should it?  R traps that signal.

I'll now make the comment I thought when I first saw this:

 	Why is this a bug report against R not sudo?

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595


[Rd] Ctrl-c crashes R when run as sudo (PR#7819)
ripley@stats.ox.ac.uk