+extern kern_return_t ledger_get_balance(ledger_t ledger, int entry,
+ ledger_amount_t *balance);
+extern kern_return_t ledger_reset_callback_state(ledger_t ledger, int entry);
+extern kern_return_t ledger_disable_panic_on_negative(ledger_t ledger, int entry);
+
+extern kern_return_t ledger_rollup(ledger_t to_ledger, ledger_t from_ledger);