Courses
Interactive courses built around real codebases. Each course runs in the browser with no setup required.
FreeBSD Internals
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Capsicum by Construction
How capability-mode sandboxing works at the kernel level — file descriptors as authority tokens, entering capability mode, and porting real programs.
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Forward Compatibility
How FreeBSD runs binaries built for newer OS versions — ELF brand hijacking, extended syscall tables, and the compat module system.
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Scheduler Internals
How the 4BSD and ULE schedulers work, compare, and evolved across major FreeBSD versions — including the pluggable scheduler framework.