A lightweight ring buffer implementation that uses alloca for stack allocation and provides iovec-based scatter/gather read/write interfaces. It is self-contained (only depends on hev-compiler.h) and can be extracted for any project needing a fixed-capacity circular buffer with efficient I/O. The design avoids dynamic allocation and supports partial reads/writes, making it suitable for high-performance network splicing.

A clean wrapper around the Wintun TUN driver for Windows. It dynamically loads wintun.dll functions via LoadLibrary/GetProcAddress, providing a simple C API for adapter creation, session management, and packet send/receive. This module is fully self-contained and can be reused in any Windows project that needs Wintun integration without dealing with the raw DLL function pointers.

A header-only utility providing READ_ONCE/WRITE_ONCE macros for safe volatile access, ALIGN_UP/DOWN for alignment, container_of for type-safe pointer conversion, and barrier() for memory ordering. These macros are essential for low-level C programming and can be dropped into any project to improve portability and correctness. The implementation is minimal and correct, following Linux kernel conventions.