On 19 Oct 2009, at 14:36, Jonas Maebe wrote:
In case it's Mac OS X on x86: floating point exception reporting via
Unix signals isn't exactly its forte.
And in case Mac OS X on ppc: the same caveats apply as for x86, except
that we don't have to any opcode decoding since the PPC doesn't raise
a hardware exception for integer div-by-zero. The system does appear
to raise the wrong exception for your test program though, but there's
not much we can do about that. This is basically our signal handler:
case sig of
SIGFPE :
begin
Case Info^.si_code Of
FPE_FLTDIV,
FPE_INTDIV : Res:=200; { floating point divide by zero }
FPE_FLTOVF : Res:=205; { floating point overflow }
FPE_FLTUND : Res:=206; { floating point underflow }
FPE_FLTRES, { floating point inexact result }
FPE_FLTINV : Res:=207; { invalid floating point operation }
Else
Res:=207; {coprocessor error}
end;
If the system say its FPE_FLTDIV (which according to /usr/include/sys/
signal.h means "[XSI] floating point divide by zero"), we report that...
Jonas
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