On Sun, 13 Jan 2008, Josh Tolley wrote: > On Jan 13, 2008 8:02 PM, Day, Roger S. <[EMAIL PROTECTED]> wrote: >> Discovered by accident: >> >> If your R session has become unresponsive to escape presses etcetera, >> you can try this. >> Open a terminal window, run the command >> >> ps -ax | grep R.app >> >> Note the process ID number in the first column. Say it's 1234. >> Then run >> >> kill -4 1234 >> >> The key is that the signal you are sending to R.app is "4". >> >> The Console will now ask you how you want to exit. >> This at a minimum gives you a chance to save any window content, >> since it's a nicely threaded application. >> Once (of 2 times) I could also cancel out of the dialog and resume the >> session. > > What signal is signal 4 on your OS (or more specifically, what signal > is it that R responds to in this manner)? If I understand correctly, > different OS's supporting kill(1) vary in the interpretation of > numerically specified signals, though I can only report this as > hearsay, and not provide specific examples. Nevertheless, folks in my > little circle tend to use kill -SIGTERM, kill -SIGQUIT, etc. rather > than numeric signal specifiers just in case kill(1) behaves > differently than they expect.
Agreed (but some signal numbers are pretty much standard, e.g. 1,2,3). Signal 4 is SIGILL on MacOS X, and I believe the R signal handler (not due to R.app's authors) is responsible: the behaviour quoted holds for any Unix-alike R. If you want to save the work and terminate on any Unix-alike, send SIGUSR1 or SIGUSR2. See ?Signals. SIGUSR1 can be 30, 10 or 16 even on Linux, depending on the architecture. -- Brian D. Ripley, [EMAIL PROTECTED] 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 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
