Re: [Rd] Run package code on R shutdown?

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Mon 10 Apr 2006 - 10:16:10 GMT

On Sun, 9 Apr 2006, Duncan Murdoch wrote:

> I'm sure I've seen this discussed before, but haven't been able to find
> it. I'd like some package code to be run when R is shut down
> (approximately when a user's .Last function would be run), to clean up
> properly. What is the best way to do this?

The only way I know to do this is to use a finalizer, as we don't run .Last.lib on shutdown. (That's how RODBC does it.)

Now, as I recall this cannot be done from reg.finalizer, only from the C-level R_RegisterCFinalizerEx, which has an optional argument to ensure that the finalizer is run 'onexit'. (I have never understood why we have that restriction, nor why reg.finalizer is primitive and not .Internal.)

-- 
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

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Received on Mon Apr 10 20:46:03 2006

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