Worked on the uutils/coreutils repository to implement real-time signal notation support in the uucore library, enabling the use of SIGRTMIN+N and SIGRTMAX-N formats for signal handling. Addressed previous gaps by updating signal helpers and switching to libc for certain real-time operations, ensuring signals were no longer ignored and compatibility extended beyond the existing Signal enum. Expanded test coverage and made the realtime_signal_bounds API public, improving reliability and Linux readiness across components like env and coreutils. The work focused on robust system programming in Rust, emphasizing accurate signal handling and comprehensive testing to reduce regressions and enhance maintainability.