---
title: ControlRequestTO
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 18.4+, macOS 10.14+]
path: iokit/iousbinterfaceinterface942/2977194-controlrequestto
---

# ControlRequestTO

## Declaration

```occ
IOReturn (*ControlRequestTO)(void *self, UInt8 pipeRef, IOUSBDevRequestTO *req);
```