NIOFailedToSetSocketNonBlockingError
NIOFailedToSetSocketNonBlockingError
indicates that NIO was unable to set a socket to non-blocking mode, either when connecting a socket as a client or when accepting a socket as a server.
This declaration has been renamed to NIOFcntlFailedError.
This declaration is deprecated.
struct NIOFailedToSetSocketNonBlockingError
This error should never happen because a socket should always be able to be set to non-blocking mode. Unfortunately, we have seen this happen on Darwin.