[R] passing lists through .C

[Catherine Loader]

I have a list,

> rb
$t
[1] "tree"
 
$x
[1] 0
 
$cut
[1] 0.8
 
$l
 [1] 0 0
 
and pass it through .C("fn",rb) to

void fn(ev)
int **ev;
{ double cut;
  cut = *(double *)ev[2][0];
  printf("%8.5f\n",cut);
}

in S-4, it produces 0.8, as I want.
But R (version 1.3.1, linux) produces a segmentation fault.
Is it possible to access list elements in R? The manual seems
to suggest writing .Call interfaces, which I want to avoid.

Thanks,
Catherine.
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