Low-Level on Ethan-ZYFhttps://ethanzyf.com/tags/low-level/Recent content in Low-Level on Ethan-ZYFHugoen-usTue, 12 May 2026 00:00:00 -0700Day 2: strace + Common Syscalls in Practicehttps://ethanzyf.com/blog/day2-strace/Tue, 12 May 2026 00:00:00 -0700https://ethanzyf.com/blog/day2-strace/<p>A practical guide to <code>strace</code>: flag cheat sheet, how to read program startup as three distinct layers (ld.so → libc init → main), annotated syscalls, and the gotchas you actually hit (fd reuse races, EINTR, short writes, locale noise).</p>Day 1: Linux Syscall Internalshttps://ethanzyf.com/blog/day1-syscalls/Mon, 11 May 2026 00:30:00 -0700https://ethanzyf.com/blog/day1-syscalls/<p>A deep dive into how Linux system calls actually work on x86_64: the ABI, the <code>syscall</code> instruction&rsquo;s hardware side effects, the full user→kernel path, and a categorized cheat sheet of the syscalls worth knowing.</p>