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The GNUstep Base Library is part of the GNUstep project, providing an open-source implementation of the Foundation framework, compatible with macOS and iOS. It offers core Objective-C classes and utilities for cross-platform application development.

...It exposes both notifications and blocks so you can react to connectivity changes without polling. Typical usage is to gate network requests, disable online-only UI, and show graceful messaging when connectivity drops. The implementation is careful about threading and runloop scheduling so events arrive reliably without blocking the main thread. It also supports reachability checks for specific hosts, enabling smarter behavior than a simple “internet yes/no” toggle. Despite newer frameworks existing today, Reachability remains widely referenced for its simple API and predictable behavior in legacy Objective-C codebases.