# SocketError.timeout A `timeout:` parameter elapsed before the operation completed. ``` case timeout ``` ## Discussion Emitted by [`connect(to:loop:timeout:)`](/documentation/Event/Socket/connect(to:loop:timeout:)), [`read(maxBytes:timeout:)`](/documentation/Event/Socket/read(maxBytes:timeout:)), and [`write(_:timeout:)`](/documentation/Event/Socket/write(_:timeout:)) when their optional `timeout` argument is non-`nil` and the kernel did not satisfy the readiness condition before the deadline. The socket itself remains usable for retry; partial writes are not consumed (the `write(2)` syscall is never issued when the timeout fires before write-readiness).