---
title: IntValueChangeHandler
framework: kernel
role: pseudoSymbol
path: kernel/ioaudiocontrol/intvaluechangehandler
---

# IntValueChangeHandler

Handler function used to make a notification when a value is to be changed.

## Declaration

```occ
typedef IOReturn ( *IntValueChangeHandler)(
   OSObject *target,
   IOAudioControl *audioControl,
   SInt32 oldValue,
   SInt32 newValue);
```

## Parameters

- `target`: Reference supplied when the handler was registered.
- `audioControl`: The IOAudioControl that is changing.
- `oldValue`: The old value of the control.
- `newValue`: The new value the control is being changed to.

## Return Value

Return Value Must return kIOReturnSuccess when the hardware is successfully updated.