---
title: PowerDownHandler
framework: kernel
role: symbol
role_heading: Instance Method
path: kernel/ioscsimultimediacommandsdevice/1576322-powerdownhandler
---

# PowerDownHandler

## Declaration

```occ
virtual IOReturn PowerDownHandler(void *refCon, UInt32 messageType, IOService *provider, void *messageArgument, vm_size_t argSize);
```