---
title: kNuDCLUpdateBeforeCallback
framework: Kernel
role: symbol
role_heading: Enumeration Case
platforms: [macOS 10.3+]
path: kernel/nudclflags/knudclupdatebeforecallback
---

# kNuDCLUpdateBeforeCallback

## Declaration

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