pg_end_copy() syncs the PostgreSQL frontend (usually a web server process) with the PostgreSQL server after doing a copy operation performed by pg_put_line(). pg_end_copy() must be issued, otherwise the PostgreSQL server may get out of sync with the frontend and will report an error. Devuelve TRUE si todo fue bien, FALSE en caso de fallo.
For further details and an example, see also pg_put_line().