Постоянная sigusr1
Реализация
static const ProcessSignal sigusr1 = const ProcessSignal._(10, "SIGUSR1");
© 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/ProcessSignal/sigusr1-constant.html
