Laurette Cisneros <laurette(at)nextbus(dot)com> writes:
> Here's the stack track from the core file:
> #1 0x4013c445 in fprintf (stream=0x0,
> format=0x4001966f "nbpointdist\n") at fprintf.c:32
Sure looks like you're trying to write on a non-open file (stream=0
suggests you're passing a NULL file pointer to fprintf).
As for your later message, no you can't return an SQL NULL by
returning a NULL pointer. The only way to return NULLs cleanly
is to use the v1 function call interface, within which the macro
PG_RETURN_NULL() works. See the documentation about writing C
functions.
regards, tom lane