PostgreSQL: Extract function DDL

SELECT n.nspname AS schema_name ,p.proname AS function_name ,pg_get_functiondef(p.oid) AS func_def ,pg_get_function_arguments(p.oid) AS args ,pg_get_function_result(p.oid) AS result FROM pg_proc p JOIN pg_namespace n ON n.oid = p.pronamespace WHERE p.proname ILIKE 'func_name%';