Re: How PG_FUNCTION_ARG works in PG

sandeep satpal <sandeep@it.iitb.ac.in> writes:
> Whenever a function get called it receive one parameter 
> as
> PG_FUNCTION_ARG ( as in nbtcompare.c )
> I am not getting how it is interpreted and how it is used ??

It's a pointer to a struct containing the actual arguments.
You might find it helpful to read src/backend/utils/fmgr/README
which is old but still accurate.
        regards, tom lane