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What happens when you launch an app on macOS
From double-click to first window: LaunchServices, launchd, posix_spawn, AMFI, dyld, the shared cache, sandbox profile installation, the runloop. Six subsystems in three seconds.
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dyld in depth: chained fixups, prebuilt loaders, and dlopen internals
Inside dyld — Loader data structures, the modern chained-fixups format, PrebuiltLoaders in the shared cache, and what dlopen actually does at runtime.
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dyld Shared Cache on macOS: How It Works
The dyld shared cache pre-links every system dylib into one file mapped into every process. Where it lives, how shared regions work, and why it saves RAM.
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