Re: Help with adding C-Language Functions

I changed my file from BlackboardFunctions.c to all lowercase, 
blackboardfunctions.c, and the database now finds the add_one function.

Crazy.  Can someone explain the reason why this happened?  Is this a 
linker issue or something in postgresql.

Seamus

On Wed, 9 Feb 2005, Seamus Thomas Carroll wrote:

> Hi,
>
> I am trying to add a C-Language Function.  I have created a small example in 
> file BlackboardFunctions.c.
>
> #include <postgres.h>
> #include <fmgr.h>
>
> PG_FUNCTION_INFO_V1(add_one);
>
> Datum
> add_one(PG_FUNCTION_ARGS)
> {
>    int32   arg = PG_GETARG_INT32(0);
>
>    PG_RETURN_INT32(arg + 1);
> }
>
> The make file:
> make:
>        cc -fpic -c BlackboardFunctions.c -I 
> /home/grads/carrolls/source/postgresql-7.4.5/src/include/
>        cc -shared -o BlackboardFunctions.so BlackboardFunctions.o
>
> Everything compiles nicely and when i try to add the function using:
> Blackboard=# CREATE FUNCTION add_one(integer) RETURNS integer
> Blackboard-#      AS 
> '/home/grads/carrolls/gradstudies/implementation/BlackboardFunctions/BlackboardFunctions', 
> 'add_one'
> Blackboard-#      LANGUAGE C STRICT;
>
> I get the following error:
> ERROR:  could not find function "add_one" in file 
> "/home/grads/carrolls/gradstudies/implementation/BlackboardFunctions/BlackboardFunctions.so"
>
> A grep of BlackboardFunction.so finds add_one.
> I figure i must be doing something obviously wrong but for the life of me i 
> cant figure out what that might bt.  Can anyone recommend a course of action?
>
> Thank you,
>
> Seamus
>
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