The current way of dealing with this is to abort() in the C library,
which will raise RuntimeError inside sig_on()/sig_off(). Something like::
#include "c_lib/include/interrupt.h"
void libgap_division_by_zero()
{
set_sage_signal_handler_message("GAP: Division by zero");
abort();
}
Then in your Cython code::
cdef class GapElement(RingElement):
# ....
cpdef RingElement _div_(self, RingElement right):
sig_on()
e = make_GapElement(QUO(self.value(<GapElement>right).value))
sig_off()
return e
See #10109 for some documentation on this.
I plan to make a better interface to handle errors from C library code
(and use that at least for PARI and NTL but potentially also GAP). But
this would depend on #9678, #10061, #10258, #10030.
Jeroen.
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