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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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The dyld shared cache and shared regions
Every system dylib pre-linked into one giant memory-mappable file, shared across every process on the system. Why a fresh process has 1 GB of virtual size but tiny resident memory.
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