mach_inject is a code injection library for Mac OS X that enables injection of arbitrary code into running processes. The tool performs two primary functions: - Copies necessary code into the target process's address space - Remotely creates a new thread to execute the injected code Key technical requirements: - Requires knowledge of assembly language and runtime calling conventions (ABIs) - Designed for advanced users with debugging capabilities - Users are responsible for troubleshooting implementation issues Development and compatibility: - Supports both i386 and x86_64 architectures - Includes compatibility updates for macOS versions through 10.12 - Features stack alignment adjustments for macOS 10.9 and later - Contains fixes for code signing and error handling The library includes a demo project and maintains an unstable development branch for contributions. Version history shows ongoing maintenance with fixes for crashes, compatibility issues, and platform-specific adjustments.