User Defined Functions/management of OS_Directories

Hallo!
I have a big problem, I am under time pressure to
finish my project. can anybody please help me?

I am developing a DB System associated with a File
server. The DB Server should manage directories which
could be, I thought, created through fired Triggers.
I wrote a C function and compiled as -shared, created
function and created trigger to execute procedure. But
its not working. Is there somewhere any example? Or c
functions guidelines? Or knows anybody how could I do
it?

After "insert into" command I got following Meldung
and none of the commands inside the c function like
mkdir(dir) are not executed:

server closed the connection unexpectedly
This probably means the server terminated
abnormally
before or while processing the request.
The connection to the server was lost. Attempting
reset: Failed.

Thanks

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