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# GetRegistryEntryID

Returns the registry ID for the current service.

```
virtual kern_return_t GetRegistryEntryID(uint64_t *registryEntryID);
```

## Parameters

`registryEntryID`

A pointer to an integer that, on return, contains the registry ID for the service. It is a programmer error to specify `NULL` or an invalid pointer for this parameter.

## Return Value

[`kIOReturnSuccess`](/documentation/DriverKit/kIOReturnSuccess) on success, or another value if an error occurs. For a list of error codes, see [Error Codes](/documentation/DriverKit/error-codes).

---

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