[Rcpp-devel] Rcpp::wrap seg fault (when called with a NULL pointer)

Christoph Bergmeir c.bergmeir at decsai.ugr.es
Tue May 24 19:49:54 CEST 2011


thanks that you resolved this issue so fast..


On 05/24/2011 06:21 PM, Dirk Eddelbuettel wrote:
> On 24 May 2011 at 17:29, Christoph Bergmeir wrote:
> | Hi,
> |
> | of course it's your decision, but I personally think that adding the check to the wrapper is a good idea. For now, I added the check everywhere in my code where I use a const char* with Rcpp::wrap.
> Please try SVN revision 3030 which is now resilient to this particular case
> of NULL:
> edd at max:~$ r -p /tmp/nil.r
> Loading required package: inline
> Loading required package: methods
> Bye
> edd at max:~$ cat /tmp/nil.r
> require(inline)
> fun<- cxxfunction(signature(),plugin="Rcpp",body='
>    const char *ret = NULL;
>    return Rcpp::wrap(ret);
> ');
> fun()
> cat("Bye\n")
> edd at max:~$
> As I joked earlier, it won't help the next time NULL comes hiding as the
> payload of another pointer, but at least const char* is now covered. I also
> added two quick unit tests.
> Thanks for alerting us to this. Segfaults are after all almost always bad.
> Dirk

Christoph Bergmeir
e-mail: c.bergmeir at decsai.ugr.es
Grupo SCI2S, DiCITS Lab          (http://sci2s.ugr.es/DiCITS)
Dpto. de Ciencias de la Computacion e Inteligencia Artificial
E.T.S. Ingenierias de Informatica y Telecomunicacion
Universidad de Granada
18071 - GRANADA (Spain)

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