[Rd] Ctrl-c crashes R when run as sudo (PR#7819)

[ripley at stats.ox.ac.uk]

On Tue, 26 Apr 2005, Peter Dalgaard wrote:

> MSchwartz at 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 at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
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