Operating system

OS-system facing primitives: processes, signals, system info, environment variables, dynamic loading and TTY detection. More...

Modules
	Environment variables
	Cross-platform wrappers around the C library's environment accessors. Lookup, set (optionally overwriting) and unset.
	Dynamic modules
	Open shared libraries at runtime, resolve exported symbols and walk named sections.
	Process introspection
	Queries about the running process — whether a debugger is attached, the executable's path and name, and the process ID.
	Signal timers
	SIGALRM-driven timers that invoke a callback once or on a recurring interval.
	System and hardware topology
	Query CPU and NUMA-node counts, build RBitset masks of the available CPUs / nodes, and walk a discovered hardware topology.
	Terminal output and ANSI escapes
	Helpers for writing to stdout / stderr with optional ANSI styling.

Detailed Description

OS-system facing primitives: processes, signals, system info, environment variables, dynamic loading and TTY detection.

Six headers:

• r_proc — process introspection and management.
• r_signal — signal handlers and synchronous delivery.
• r_sys — system info (uname-style, CPU count, hostname).
• r_env — environment-variable accessors.
• r_module — dynamic-library loading (dlopen / LoadLibrary).
• r_tty — terminal detection and capability queries.