---
title: kNuDCLUpdateBeforeCallback
framework: IOKit
role: symbol
role_heading: Enumeration Case
platforms: [Mac Catalyst 13.0+, macOS 10.3+]
path: iokit/nudclflags/knudclupdatebeforecallback
---

# kNuDCLUpdateBeforeCallback

## Declaration

```occ
kNuDCLUpdateBeforeCallback = BIT( 2 )
```