---
title: IOTypes.h User-Space
framework: iokit
role: collectionGroup
role_heading: API Collection
path: iokit/iotypes_h_user-space
---

# IOTypes.h User-Space

## Overview

Overview Included Headers <mach/message.h> <mach/vm_types.h> <IOKit/IOReturn.h> <stdbool.h> <libkern/OSTypes.h> <device/device_types.h>

## Topics

### Constants

- [Scale Factors](iokit/iotypes_h_user-space/1553154-scale_factors.md)