[Rd] .Fortran interface error

[Prof Brian Ripley]

Please try running this under valgrind (see 'Writing R Extensions'). 
The most likely cause is that the Fortran code is corrupting its or 
R's memory.  You may need a build of R set up to instrument R 
allocations (see the manual for details).

On Tue, 13 Apr 2010, jgarcia at ija.csic.es wrote:

> Hi all,
> I'm preparing a package which uses .Fortran to interface a Fortran 95
> function. This F95 function simply receives the name of a file from R,
> opens this file and forwards its content to a F95 module, which, in turn,
> makes the real computation.  The F95 module is a pre-existing one and I'm
> trying to use it in its actual state.
>
> Thus, data transfer between R and this F95 module is made through scratch
> system files (binary or ASCII), and R-F95 interface simply forwards a
> pathed name to this module.
>
> OS: openSUSE 10.3 (x86_64)
> R version 2.10.1 (2009-12-14)
>
> Then, I've put a demo which makes use of the function, but after model
> execution (the F95 code) finishes correctly, and all output is read  back
> properly by R (again through system files), R halts, and the following
> message appears:
>
> *** glibc detected *** /usr/local/lib64/R/bin/exec/R: free(): invalid
> pointer: 0x00000000008a1aa0 ***
>
> Could you give me any hint about where to look for errors?
>
> Just to say that if instead of the R-f95 interface,
>
> I compile the F95 code as executable "runhydro" an call it as:
>
>> system(paste(bindirp,"runhydro",sep="/"))
>
> everything is OK, while compilation as a dynamic library and access to the
> F95 "big" module through the simple R-F95 interface:
>
>> res <- .Fortran("runhydro",
>                 runfile = as.character(mainfile[1]),
>                 charsfile = nchar(mainfile[1]),
>                 PACKAGE = "hydroarid"
>               )
>
> is what is giving the error (I could handle you the package)
>
> Thanks and best regards,
>
> Javier
> ---
>
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>

-- 
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