During April 2025, Ningyuan contributed to the rust-lang/libc repository by implementing Android Network Interface Binding by Index, enabling sockets to bind directly to a specific network interface using the SO_BINDTOIFINDEX constant. This work involved defining the constant in Rust, updating the Android semver file, and ensuring compatibility with devices running SDK 31 and above. Ningyuan’s approach leveraged low-level programming and system programming skills, focusing on operating system interfaces and cross-version support. The feature improved network path control and reliability for Android applications, reducing the need for app-level workarounds and aligning libc’s capabilities with evolving Android platform requirements.