---
title: fDataBufferCookie
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 18.4+, macOS 10.2+]
path: iokit/iousblowlatencyisocstruct/1425473-fdatabuffercookie
---

# fDataBufferCookie

## Declaration

```occ
UInt32 fDataBufferCookie;
```