Refacture structure proposal. (#1793)

command/signals.go

@@ -0,0 +1,49 @@
+/*
+ * Minio Client, (C) 2015 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package command
+
+import (
+	"os"
+	"os/signal"
+)
+
+// signalTrap traps the registered signals and notifies the caller.
+func signalTrap(sig ...os.Signal) <-chan bool {
+	// channel to notify the caller.
+	trapCh := make(chan bool, 1)
+
+	go func(chan<- bool) {
+		// channel to receive signals.
+		sigCh := make(chan os.Signal, 1)
+		defer close(sigCh)
+
+		// `signal.Notify` registers the given channel to
+		// receive notifications of the specified signals.
+		signal.Notify(sigCh, sig...)
+
+		// Wait for the signal.
+		<-sigCh
+
+		// Once signal has been received stop signal Notify handler.
+		signal.Stop(sigCh)
+
+		// Notify the caller.
+		trapCh <- true
+	}(trapCh)
+
+	return trapCh
+}