Technologies›Area 20

Low-level, Kernel & Legacy

22 frameworks

This area provides direct access to the lowest layers of the operating system, exposing the Darwin/BSD C system layer, Mach kernel interfaces, and the Objective-C runtime to your code. Its frameworks let you communicate with hardware and device drivers, manage disks and kernel extensions, and create and run virtual machines on Apple silicon and Intel Macs. It also preserves legacy and bridging technologies—such as Carbon, OpenCL, and scripting overlays—for maintaining and migrating older software.

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Darwin1371 types

The Darwin/BSD C system layer: POSIX APIs, Mach kernel interfaces, MacTypes, and core OS-level types and error codes.

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Low-level device driver and hardware access framework for HID, graphics, storage, USB, and other I/O families.

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ObjectiveC13 types

The Objective-C runtime: classes, methods, instance variables, properties, message dispatch, and dynamic introspection.

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Virtualization141 types

Create and run virtual machines on Apple silicon and Intel Macs, configuring boot loaders, CPUs, storage, network, audio, and console devices.

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AppleScriptObjC

Bridges AppleScript and Objective-C by loading AppleScript-ObjC scripts from a bundle for scripting automation on macOS.

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Carbon165 types

Legacy Carbon/HIToolbox APIs for events, menus, windows, and common panels on classic macOS.

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DirectoryService8 types

Legacy C interface to macOS Open Directory/DirectoryService for querying directory nodes, users and authentication data.

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DiscRecording25 types

Burn data and audio to CD and DVD media: manage burns, tracks, content files/folders, and CD-Text.

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DiscRecordingUI15 types

Provides standard macOS panels for burning and erasing CD/DVD optical discs atop DiscRecording.

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DiskArbitration3 types

Low-level API to observe and control disk mounting, unmounting, ejecting, and renaming via DASession and DADisk.

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ForceFeedback9 types

Legacy IOKit-based API for sending force-feedback (haptic) effects to game controllers and joysticks.

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Legacy OpenGL Utility Toolkit providing windowing, input and primitive-drawing helpers for OpenGL applications.

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Hypervisor25 types

Low-level hypervisor API to build virtualization solutions, managing VMs, virtual CPUs, memory, and interrupt controllers.

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IOUSBHost34 types

Low-level USB host controller interface for communicating with and managing USB devices and endpoints.

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JavaRuntimeSupport7 types

Bridges the Java runtime to macOS AppKit/AWT for accessibility, cursors, drag, events, fonts, and input methods.

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KernelManagement

Framework for inspecting and managing kernel extensions (kexts) and DriverKit drivers on the system.

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Legacy framework for general-purpose parallel computation on CPUs and GPUs using the Open Computing Language.

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Swift overlay exposing the embedded Tcl scripting language C interpreter library constants and bindings.

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Legacy TWAIN data source manager types and constants for acquiring images from scanners and other imaging devices.

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_DarwinFoundation1 overlay1 types

Swift overlays for Darwin C headers: math constants, POSIX error codes, locale, qos, and other low-level system definitions.

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_DarwinFoundation3 overlay

Internal overlay exposing low-level Darwin/POSIX C primitives (pthread, signal, mach, sched, sys headers) to Swift.

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_Volatile overlay1 types

Pointer type for accessing volatile memory like memory-mapped I/O registers in kernels, firmware, and embedded environments.

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