---
title: kIOReturnUnderrun
framework: IOKit
role: symbol
role_heading: Global Variable
platforms: [Mac Catalyst 13.0+, macOS 10.9+, xcode 8.0+]
path: iokit/kioreturnunderrun
---

# kIOReturnUnderrun

## Declaration

```swift
var kIOReturnUnderrun: IOReturn { get }
```