Guanyi worked on improving the reliability of error reporting in the apache/nuttx simulation environment by addressing atomicity in host-call error retrieval. Focusing on C programming within embedded systems and operating systems, Guanyi introduced the host_uninterruptible_errno mechanism, ensuring that system calls and subsequent errno retrieval occur without interruption. This required refactoring the simulation’s host-call handling to guarantee atomic completion before error reporting, thereby reducing intermittent failures and flaky tests. The work demonstrated a deep understanding of concurrency and error propagation in simulated environments, resulting in more stable and predictable test outcomes. Guanyi’s contributions enhanced the robustness of the Nuttx simulation platform.