pg_cfunction

study creating C-language Function in PostgreSQL

---

eg:
gcc -I /opt/BeyonDB/5.0/include/postgresql/server -c add_one.c -fPIC
gcc -shared -o add_one.so add_one.o
cp add_one.so /opt/BeyonDB/5.0/lib/postgresql

---

1. add_one(integer)
2. version()
3. wrong()