Fix: NonblockingIO is not supported on all platforms

psiphon/common/tun/nonblock.go

@@ -1,3 +1,5 @@
+// +build darwin linux
+
 /*
  * Copyright (c) 2017, Psiphon Inc.
  * All rights reserved.

psiphon/common/tun/nonblock_test.go

@@ -1,3 +1,5 @@
+// +build darwin linux
+
 /*
  * Copyright (c) 2017, Psiphon Inc.
  * All rights reserved.

psiphon/common/tun/nonblock_unsupported.go

@@ -0,0 +1,49 @@
+// +build !darwin,!linux
+
+/*
+ * Copyright (c) 2017, Psiphon Inc.
+ * All rights reserved.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+package tun
+
+import (
+	"github.com/Psiphon-Labs/psiphon-tunnel-core/psiphon/common"
+)
+
+type NonblockingIO struct {
+}
+
+func NewNonblockingIO(ioFD int) (*NonblockingIO, error) {
+	return nil, common.ContextError(unsupportedError)
+}
+
+func (nio *NonblockingIO) Read(p []byte) (int, error) {
+	return 0, common.ContextError(unsupportedError)
+}
+
+func (nio *NonblockingIO) Write(p []byte) (int, error) {
+	return 0, common.ContextError(unsupportedError)
+}
+
+func (nio *NonblockingIO) IsClosed() bool {
+	return false
+}
+
+func (nio *NonblockingIO) Close() error {
+	return common.ContextError(unsupportedError)
+}