---
title: IOKit Structures
framework: IOKit
role: collectionGroup
role_heading: API Collection
path: iokit/iokit_structures
---

# IOKit Structures

## Topics

### Structures

- [IOAsyncCompletionContent](iokit/ioasynccompletioncontent.md)
- [IOCFPlugInInterfaceStruct](iokit/iocfplugininterfacestruct.md)
- [IONamedValue](iokit/ionamedvalue.md)
- [IOPhysicalRange](iokit/iophysicalrange.md)
- [IOServiceInterestContent](iokit/ioserviceinterestcontent.md)
- [IOServiceInterestContent64](iokit/ioserviceinterestcontent64.md)
- [IOURLError](iokit/iourlerror.md)
- [IOVirtualRange](iokit/iovirtualrange.md)
- [OSNotificationHeader](iokit/osnotificationheader.md)
- [OSNotificationHeader64](iokit/osnotificationheader64.md)
- [IORPC](iokit/iorpc.md)
- [IORPCMessage](iokit/iorpcmessage.md)
- [IORPCMessageErrorReturn](iokit/iorpcmessageerrorreturn.md)
- [IORPCMessageErrorReturnContent](iokit/iorpcmessageerrorreturncontent.md)
- [IORPCMessageMach](iokit/iorpcmessagemach.md)
- [OSClassDescription](iokit/osclassdescription.md)