42 Barcelona · Common Core
These are not tutorials or exercises. Each project is a from-scratch implementation evaluated by peer engineers and automated graders — no partial credit, no hints. They represent the systems-level foundation that carries forward into production work.
A client-server communication system built entirely on UNIX signals (SIGUSR1 / SIGUSR2). No sockets, no pipes. Each bit of the message is transmitted as a signal, with sigaction + SA_SIGINFO providing sender PID for reliable ACK routing. The protocol transmits a 32-bit length prefix before the payload, allowing the server to allocate an exact buffer before reconstruction begins.
Sorts arbitrary integers using two stacks and 12 allowed operations, minimizing total operation count. Three-path strategy: hardcoded optimal sequences for n ≤ 3, manual extraction for n ≤ 5, and binary radix sort by index bits for large inputs. 31 commits document the iterative development; Workflow.txt shows the algorithm was designed on paper before any code was written.
Renders elevation maps as isometric wireframes using direct framebuffer writes — paint_pixel() computes pixel offsets via pointer arithmetic into MiniLibX's raw pixel buffer, with no drawing library calls. Bresenham's line algorithm draws edges with bounds checking against a 2000×2000 canvas. Map dimensions, elevation values, and colours are parsed at runtime using a self-implemented get_next_line.
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