Function lo_lseek

src/interfaces/libpq/fe-lobj.c:348–383

* lo_lseek * change the current read or write location on a large object */

 *	  change the current read or write location on a large object
 */
int
lo_lseek(PGconn *conn, int fd, int offset, int whence)
{
	PQArgBlock	argv[3];
	PGresult   *res;
	int			retval;
	int			result_len;

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

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

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

	argv[2].isint = 1;
	argv[2].len = 4;
	argv[2].u.integer = whence;

	res = PQfn(conn, conn->lobjfuncs->fn_lo_lseek,
			   &retval, &result_len, 1, argv, 3);
	if (PQresultStatus(res) == PGRES_COMMAND_OK)
	{
		PQclear(res);
		return retval;
	}
	else
	{
		PQclear(res);
		return -1;
	}
}

/*
 * lo_lseek64