| // Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| /// @assertion Stream<ProcessSignal> watch() |
| /// Watch for process signals. |
| /// The following ProcessSignals can be listened to: |
| /// - ProcessSignal.sighup. |
| /// - ProcessSignal.sigint. Signal sent by e.g. CTRL-C. |
| /// - ProcessSignal.sigterm. Not available on Windows. |
| /// - ProcessSignal.sigusr1. Not available on Windows. |
| /// - ProcessSignal.sigusr2. Not available on Windows. |
| /// - ProcessSignal.sigwinch. Not available on Windows. |
| /// |
| /// Other signals are disallowed, as they may be used by the VM. |
| /// |
| /// A signal can be watched multiple times, from multiple isolates, where all |
| /// callbacks are invoked when signaled, in no specific order. |
| /// |
| /// @description Used in test watch_A01_t02.dart to check that mention signals |
| /// can be listened. |
| /// @author ngl@unipro.ru |
| |
| import "dart:async"; |
| import "dart:io"; |
| |
| void main(arg) { |
| // This process should die if it never receives a signal. |
| var timeout = new Timer(new Duration(seconds: 5), () => exit(1)); |
| |
| var sigCount = 0; |
| var li1; |
| bool sigw = false; |
| |
| void check() { |
| if (sigCount > 1) { |
| exit(1); |
| } |
| if (sigw && (sigCount == 1)) { |
| exit(0); |
| } |
| if (sigCount == 1) { |
| li1.cancel(); |
| } |
| print("ready"); |
| } |
| |
| var signal; |
| switch (arg[0]) { |
| case 'SIGHUP': |
| signal = ProcessSignal.sighup; |
| break; |
| case 'SIGINT': |
| signal = ProcessSignal.sigint; |
| break; |
| case 'SIGTERM': |
| signal = ProcessSignal.sigterm; |
| break; |
| case 'SIGUSR1': |
| signal = ProcessSignal.sigusr1; |
| break; |
| case 'SIGUSR2': |
| signal = ProcessSignal.sigusr2; |
| break; |
| case 'SIGWINCH': |
| signal = ProcessSignal.sigwinch; |
| break; |
| } |
| |
| li1 = signal.watch().listen((lsignal) { |
| if (lsignal != signal) { |
| exit(1); |
| } |
| sigCount++; |
| if (signal == ProcessSignal.sigwinch) { |
| sigw = true; |
| } |
| check(); |
| }); |
| |
| check(); |
| } |