#423 - Implemented mmap-backed brk compatibility shim #424
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Added a locked mmap arena for brk/sbrk, wired it into the libc build, updated host mmap handling, documented the issue in tasks.json, and introduced a covering Unity test.\n\nTests: make test
Architecture changes: - Updated mem.md to describe userland brk/sbrk shim backed by mmap - Updated per_process_vm.md to mark brk/sbrk as complete via #423 - Updated syscall_abi.md to clarify brk/sbrk are libc functions, not syscalls Issue tracking: - Marked #364 (stubbed functions) and #423 (brk/sbrk shim) as closed - Updated stubbed functions status: 93% complete (13/14) - Only gets() remains (deliberately not implementing - security vulnerability) Dependency updates: - Updated issues #55 and #56 to reflect brk/sbrk availability - Removed incorrect references to issue #21 (PS/2 keyboard, not brk/sbrk) - Updated dependency diagrams with corrected issue relationships Diagrams: - Refreshed libc and full dependency diagrams - Regenerated PNG images to reflect current state
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Added a locked mmap arena for brk/sbrk, wired it into the libc build, updated host mmap handling, documented the issue in tasks.json, and introduced a covering Unity test.\n\nTests: make test