errorCode property
final
Error code supplied by the operating system.
Will have the value OSError.noErrorCode if there is no error code associated with the error.
Implementation
final int errorCode;© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-io/OSError/errorCode.html