Worked on enhancing the rust-lang/libc repository by adding Fuchsia-specific socket option constants to improve compatibility and socket functionality for the Fuchsia operating system. Focused on introducing SO_COOKIE, SO_TIMESTAMPNS, and SO_FUCHSIA_MARK, the work involved careful mapping of these constants to align with Fuchsia semantics while preserving API stability. The approach emphasized minimal surface area changes, ensuring that cross-OS portability was strengthened without disrupting existing interfaces. Leveraged expertise in Rust, network programming, and system programming to deliver a focused update that enables downstream projects to integrate Fuchsia support more easily, reflecting a precise and targeted engineering contribution within the codebase.