---
title: controllerWillChangePowerState
framework: kernel
role: symbol
role_heading: Instance Method
path: kernel/ioethernetinterface/1585542-controllerwillchangepowerstate
---

# controllerWillChangePowerState

## Declaration

```occ
virtual IOReturn controllerWillChangePowerState(IONetworkController *controller, IOPMPowerFlags flags, UInt32 stateNumber, IOService *policyMaker);
```