During April 2026, contributed to the DragonOS-Community/DragonOS repository by addressing a critical edge case in the procfs subsystem using C++ and system programming expertise. Focused on correcting the hard link operation to ensure it returns EPERM when attempting to create a hard link to a procfs file, thereby aligning error signaling with expected kernel semantics. Enhanced reliability by introducing a targeted regression test, leveraging unit testing skills to safeguard against future regressions. Documented the changes thoroughly in the repository, improving traceability and maintainability. The work emphasized robust error handling and reinforced test coverage to support ongoing system stability.