[SQL] how to execute a C program via trigger ?

[S.F. Lee]

Hi,
   
   I am using Red Hat 6.1 + PostgreSQL 7.0.3. All of
my
applications are developed by C and ECPG.  I would
like to know how to execute a C program by Trigger,for
example:


   1. I have a program my_c_program.c shuch as:

#include <stdio.h>
main()
{
   printf("Hello World !\n");
}

   2. I create a table foo by following command

CREATE TABLE foo
        (
        x      int4
        );

   3. create a trigger  foo_trig :

create trigger foo_trig after update
    on foo for each row execute procedure sql_c();
   
   4. I don't know how to design sql_c(), can anyone
      give a small plpsql program that can execute
      my_c_program?  

   regards,    S.F. Lee


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