[Cython] Propagating exceptions with functions which returns void*

[Daniele Pianu]

Probably I've not completely understood the C-function
exception-propagating mechanism. I've a function with a prototype like
this

void* getItem( void* self, int i )

The function returns the i-th item in self. Some index and bounds
checking are implemented, so if, for example, I specify a negative
index or an index out of self bounds I raise and exception. In cython
the function is declared in this way:

cdef void* getItem( void* self, int i ) except NULL

But when an error occurs and the exception is raised I always receive
a message which says that the exception is ignored. Obviously, the
function continues its execution and terminates whit a segmentation
fault.

The question is: how can I propagate to caller functions the raised exception?
Thanks for your help (and for the great work that you've done with cython :D ),
Daniele