| // Copyright (c) 2014, 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. |
| |
| import 'dart:async'; |
| import 'dart:io'; |
| |
| /// A cache for [supportsIpV6]. |
| bool _supportsIpV6; |
| |
| /// Returns whether this computer supports binding to IPv6 addresses. |
| Future<bool> get supportsIpV6 async { |
| if (_supportsIpV6 != null) return _supportsIpV6; |
| |
| try { |
| var socket = await ServerSocket.bind(InternetAddress.LOOPBACK_IP_V6, 0); |
| _supportsIpV6 = true; |
| socket.close(); |
| return true; |
| } on SocketException catch (_) { |
| _supportsIpV6 = false; |
| return false; |
| } |
| } |