One thing that may help with debugging (and seeing if you get the same
error on windows) is to run your code with
R> gctorture(TRUE)
R> your.function()
That way everything is garbage collected all the time so to speak and
this may trigger an error on your windows machine.
I agree with Oleg - in my experience it is always a user error. You
could also try to compile it with warnings set high(er).
Kasper
On May 4, 2008, at 2:19 PM, Oleg Sklyar wrote:
Katie,
99% it's a bug in your C code caused by accessing memory (probably
writing to) which was not allocated or freed already or out of
boundary. The fact that it worked fine on Windows is likely to be a
pure coincidence of different compiler/optimisation settings.
However, the main problem is that segfault is such a generic error
that without looking at the code one will not be able to tell you
anything.
Debug it, get ddd with gdb and go step-wise or introduce lots of
pritouts to nail down the location of the problem.
Oleg
Kyeongmi Cheon wrote:
Hello all,
I'm trying to have C called by R. I wrote C codes that worked
perfectly fine with R-2.6.0 in
windows system ( using R tools).
I had to change to SuSE Linux (this system has 3.2 GHz Intel
Xeon processors and 4 GB of RAM), the C codes were compiled okay but
when it was called to R-2.6.2, I got
error mesage :
***caught segfault***
address 0x1df5000, cause 'memory not mapped'
segmentation fault
According to C references, this kind of error occurs when you get
something wrong with
dereferencing pointers or go out of edge of arrays. But the very same
codes were fine in windows
and I did not find any related errors in my codes. How could this
happen and how can I fix it? Does this have to do with different
systems (linux vs windows) or C/R program?
Thank you in advance.
--
Dr Oleg Sklyar * EBI-EMBL, Cambridge CB10 1SD, UK * +44-1223-494466
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