From 2231e3eae86c5e3ae05e30f667d331f5875c7884 Mon Sep 17 00:00:00 2001
From: Sebastien Douheret <sebastien.douheret@iot.bzh>
Date: Fri, 23 Feb 2018 22:13:22 +0100
Subject: Added target and terminal support

Signed-off-by: Sebastien Douheret <sebastien.douheret@iot.bzh>
---
 signals.go | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 signals.go

(limited to 'signals.go')

diff --git a/signals.go b/signals.go
new file mode 100644
index 0000000..042257e
--- /dev/null
+++ b/signals.go
@@ -0,0 +1,70 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/signal"
+)
+
+// OnSignalCB callback type for signal
+type OnSignalCB func(sig os.Signal)
+
+// MonSignals .
+type MonSignals struct {
+	callback          map[string][]OnSignalCB
+	registeredSignals []os.Signal
+}
+
+var monSig MonSignals
+
+// MonitorSignals Routine used to monitor signals (eg. SIGINT, SIGTERM, ...)
+func MonitorSignals() {
+
+	monSig.callback = make(map[string][]OnSignalCB)
+	monSig.registeredSignals = GetRegisteredSignals()
+
+	sigs := make(chan os.Signal, 1)
+	signal.Notify(sigs, monSig.registeredSignals...)
+
+	go func() {
+		for {
+			sig := <-sigs
+			Log.Debugf("Detect signal %v", sig)
+			if cbArr, exist := monSig.callback[sig.String()]; exist {
+				for _, cb := range cbArr {
+					cb(sig)
+				}
+			}
+		}
+	}()
+}
+
+// isSupportSignal Check if a signal is supported or not
+func isSupportSignal(sig os.Signal) bool {
+	for _, s := range monSig.registeredSignals {
+		if s == sig {
+			return true
+		}
+	}
+	return false
+}
+
+// OnSignal Register a callback for a specified signal
+func OnSignal(sig os.Signal, fCB OnSignalCB) error {
+	if !isSupportSignal(sig) {
+		return fmt.Errorf("unsupported signal %v", sig)
+	}
+	sigStr := sig.String()
+	monSig.callback[sigStr] = append(monSig.callback[sigStr], fCB)
+	return nil
+}
+
+// OnSignals Register a callback for any signals
+func OnSignals(fCB OnSignalCB) error {
+	for _, s := range monSig.registeredSignals {
+		if err := OnSignal(s, fCB); err != nil {
+			return err
+		}
+	}
+	return nil
+}
-- 
cgit 1.2.3-korg