---
title: IOCompletionUPP
framework: Core Services
role: symbol
role_heading: Type Alias
platforms: [Mac Catalyst 17.0+, macOS 10.0+]
path: coreservices/iocompletionupp
---

# IOCompletionUPP

## Declaration

```occ
typedef IOCompletionProcPtr IOCompletionUPP;
```