I/O Kit

The I/O Kit is an open-source framework in the XNU kernel that helps developers code device drivers for Apple's Mac OS X and iOS operating systems. The I/O Kit framework evolved from NeXTSTEP's DriverKit, and shared no similarities with either Mac OS 9's device driver framework, or that of BSD.

The I/O Kit framework is implemented in a subset of C++ which omits features that Apple feels are unsafe for use in a multithreaded kernel (exceptions, multiple inheritance, templates, run-time type information). Embedded C++ was chosen partly because Apple believed developers would be more comfortable writing drivers in a more commonly used language than Objective-C, while still providing an object-oriented framework allowing device driver developers to focus on coding features specific to their hardware instead of reimplementing features common to any given device.

In addition to providing common code for device drivers, this framework also provides power management, driver stacking, automatic configuration, and dynamic loading of drivers.

References

I/O Kit Fundamentals - Technical reference from Apple Developer Connection

macOS

History · Architecture · Components · Technologies · Server · Software

Versions

Applications

Automator Calculator Calendar Chess Contacts Dashboard Dictionary DVD Player FaceTime Finder Game Center Grapher iTunes (version history) Launchpad Mac App Store Mail Messages Notes Notification Center Photo Booth Photos Preview QuickTime Reminders Safari (version history) Stickies TextEdit Time Machine

Discontinued	Front Row iChat iPhoto iSync Sherlock

Utilities

Activity Monitor AirPort Utility AppleScript Editor Archive Utility Audio MIDI Setup Bluetooth File Exchange Boot Camp ColorSync Configurator Console Crash Reporter DigitalColor Meter Directory Utility DiskImageMounter Disk Utility Font Book Grab Help Viewer Image Capture Installer Keychain Access Migration Assistant Network Utility ODBC Administrator Screen Sharing System Preferences System Information Terminal Universal Access VoiceOver

Discontinued	Software Update Remote Install Mac OS X

Technology and
user interface

AirDrop Apple File System Apple menu Apple Push Notification Service AppleScript Aqua Audio Units Bonjour CloudKit Cocoa ColorSync Command key Core Animation Core Audio Core Data Core Foundation Core Image Core OpenGL Core Text Core Video CUPS Cover Flow Darwin Dock FileVault Fonts Gatekeeper Grand Central Dispatch icns iCloud Inkwell I/O Kit Kernel panic Keychain launchd Mach-O MacRuby Menu extra Metal Mission Control OpenCL Option key Preference Pane Property list Quartz QuickTime Quick Look Smart Folders Speakable items Spotlight Stacks System Integrity Protection Uniform Type Identifier Universal binary WebKit XNU XQuartz

Deprecated	Carbon

Discontinued	BootX Brushed metal Classic Environment Rosetta Spaces Xgrid

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