[R] meta-question about R

Duncan Murdoch murdoch.duncan at gmail.com
Thu Apr 24 16:05:19 CEST 2014

On 24/04/2014 9:56 AM, m.roth at 5-cent.us wrote:
> Duncan Murdoch wrote:
> > On 24/04/2014, 7:42 AM, Jim Lemon wrote:
> >> On 04/24/2014 08:52 PM, mark wrote:
> >>> On 04/23/14 23:22, William Dunlap wrote:
> <snip>
> >>> deleting those files. I'm sure that my user's long-running job is
> >>> creating them. What I'm asking is if ANYONE HERE knows if there is some
> >>> configuration file, or command inside R, that would tell R, whatever
> >>> package it's using (I assume that all packages inherit from the
> >>> top-level process), when it creates files in /dev/shm, to name them
> >>> something that I can use with wildcards in rkhunter's configuration
> >>> file so that rkhunter ignores them.
> >> You are correct, I didn't understand what you were asking. Doing a bit
> >> of searching, the sem_open function's first argument is the name of the
> >> file that is to be created. It doesn't sound like you are specifying
> >> these filenames, so it is probably a matter of finding the function that
> >> calls sem_open or sem_init. I would approach this by grepping the source
> >> code of the functions that you are calling, but as I have no idea what
> >> these functions are (or how many levels of function calling goes on
> >> before one of these two functions is called), I can't provide a
> >> straightforward answer. If you do find the offending function, you can
> >> just edit the source code to include your "R_temp" prefix, save the
> >> edited function, and "source" it to replace the function that is not
> >> providing the prefixes.
> >
> > Using debug(sem_open) is a quick way to find who is calling them.  R
> > will break execution when it enters that function.  Use the debugger
> > "where" command to see the calling stack.
> Thank you both very much - that's what I needed to know. One question,
> though - is there an R.conf or something, where the default is format of
> that filename is set? I've looked through the rpm for R-core, and what
> .../etc/... files are in it, and I don't see that. Is there such a config,
> or is that hard-coded into R itself?

There isn't an R.conf file.  Jim told you how the filename is set in the 
low level sem_open; you'll have to look at the source of the caller to 
see how it determines the name it uses.

Duncan Murdoch

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