Package sock provides zero-allocation socket types and address machinery for Unix systems in Go. The package uses direct syscalls via the zcall assembly package, bypassing Go's runtime hooks. All sockets are created with SOCK_NONBLOCK and SOCK_CLOEXEC flags. Use sock instead of net when you need: For typical applications where latency is not critical, the standard net package provides a simpler and more portable API. All I/O operations follow the Strike-Spin-Adapt model: By default, operations are non-blocking: When a deadline is set, operations retry with progressive backoff: Errors follow a layered semantic model: The Sockaddr interface is the foundation of zero-allocation address handling: Address types (SockaddrInet4, SockaddrInet6, SockaddrUnix) embed raw kernel structures and return pointers directly—no marshaling, no allocation. All sockets expose iofd.FD via the FD() method for io_uring integration and other async I/O mechanisms. Address conversion functions bridge with the standard net package: Type aliases (Conn, Addr, Listener) provide net.Conn, net.Addr, net.Listener interface compatibility.