Function lo_open

src/interfaces/libpq/fe-lobj.c:56–86

* lo_open * opens an existing large object * * returns the file descriptor for use in later lo_* calls * return -1 upon failure. */

 * return -1 upon failure.
 */
int
lo_open(PGconn *conn, Oid lobjId, int mode)
{
	int			fd;
	int			result_len;
	PQArgBlock	argv[2];
	PGresult   *res;

	if (lo_initialize(conn) < 0)
		return -1;

	argv[0].isint = 1;
	argv[0].len = 4;
	argv[0].u.integer = lobjId;

	argv[1].isint = 1;
	argv[1].len = 4;
	argv[1].u.integer = mode;

	res = PQfn(conn, conn->lobjfuncs->fn_lo_open, &fd, &result_len, 1, argv, 2);
	if (PQresultStatus(res) == PGRES_COMMAND_OK)
	{
		PQclear(res);
		return fd;
	}
	else
	{
		PQclear(res);
		return -1;
	}
}

/*
 * lo_close