[Rd] Ctrl-C with R.exe and Rterm.exe in R v1.9.0
Prof Brian Ripley
ripley at stats.ox.ac.uk
Thu May 6 18:01:09 CEST 2004
On Thu, 6 May 2004, Henrik Bengtsson wrote:
> > -----Original Message-----
> > From: r-devel-bounces at stat.math.ethz.ch
> > [mailto:r-devel-bounces at stat.math.ethz.ch] On Behalf Of Duncan
> > Sent: den 6 maj 2004 16:16
> > To: Henrik Bengtsson
> > Cc: r-devel at stat.math.ethz.ch
> > Subject: Re: [Rd] Ctrl-C with R.exe and Rterm.exe in R v1.9.0
> > On Wed, 5 May 2004 12:57:29 +0200, "Henrik Bengtsson"
> > <hb at maths.lth.se> wrote :
> > >Ctrl-C works as expected. Exiting R and you're back at a "clean"
> > >prompt. Now, try the same thing with R.exe (from a restarted
> > >
> > >C:\Program Files\R>rw1090\bin\R.exe --vanilla --quiet
> > >> ^C
> > >> ^C
> > >> 1+1
> > > 2
> > >> Sys.sleep(100)
> > >^C
> > >C:\Program Files\R>
> > >>
> > >
> > >Strange things happen. R seems still to be running but has
> > at the same
> > >time returned(?) the control back to the Command prompt.
> > Yes, that is indeed strange behaviour.
> > Ctrl-C definitely presents problems. For instance, on my
> > WinXP system running R from a Cygwin prompt, a Ctrl-C during
> > the Sys.sleep kills Rterm, whereas under the Windows cmd.exe
> > prompt it works properly as it did for you.
> Cygwin is indeed where I noticed the problem first. For Cygwin, I know
> that Ctrl-C did not kill Rterm on R v1.7.1 and before, but from R
> v1.8.1 (don't know about R v1.8.0) it all of a sudden started to do
> it. Maybe there is a clue somewhere in the diff's between v1.7.1 and
> v1.8.x, which may also explain what is going on in R.exe and
No, as it was to do with a change in the MinGW runtime system and not in
Expecting to be able to use ^C as a Windows signal in a shell that is
emulating Unix is I think unrealistic. ^C in Rterm does work in tcsh.exe,
cmd.exe and various clones.
It is becoming a mantra, but
*** Cygwin is not Windows ***
and R is a Windows and not Cygwin executable. People who want a Cygwin
port of R perhaps should work on one ....
Brian D. Ripley, ripley at 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
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