Prevent race condition.

It is possible for an os.Interrupt signal to be raised after
signals.RegisterCloser() and before startup of goroutine signals.Handle().

Race is prevented by synchronously calling signal.Notify().

main.go

@@ -141,7 +141,7 @@ func main() {
 		if err != nil {
 			log.Fatal(err.Error())
 		}
-		go signals.Handle()
+		signals.Handle()
 		if len(config.TorrentFileStorage) > 0 {
 			err := os.MkdirAll(config.TorrentFileStorage, 0700)
 			if err != nil {

util/signals/unix.go

@@ -22,22 +22,24 @@ func handleReload() {
 func Handle() {
 	chnl := make(chan os.Signal)
 	signal.Notify(chnl, syscall.SIGHUP, os.Interrupt)
-	for {
-		sig, ok := <-chnl
-		if !ok {
-			break
+	go func(chnl chan os.Signal) {
+		for {
+			sig, ok := <-chnl
+			if !ok {
+				break
+			}
+			switch sig {
+			case syscall.SIGHUP:
+				handleReload()
+				break
+			case os.Interrupt:
+				interrupted()
+				return
+			default:
+				break
+			}
 		}
-		switch sig {
-		case syscall.SIGHUP:
-			handleReload()
-			break
-		case os.Interrupt:
-			interrupted()
-			return
-		default:
-			break
-		}
-	}
+	}(chnl)
 }
 
 // unix implementation of interrupt

util/signals/win32.go

@@ -12,20 +12,22 @@ func Handle() {
 
 	chnl := make(chan os.Signal)
 	signal.Notify(chnl, os.Interrupt)
-	for {
-		sig, ok := <-chnl
-		if !ok {
-			break
+	go func(chnl chan os.Signal) {
+		for {
+			sig, ok := <-chnl
+			if !ok {
+				break
+			}
+			switch sig {
+			case os.Interrupt:
+				// this also closes listeners
+				interrupted()
+				return
+			default:
+				break
+			}
 		}
-		switch sig {
-		case os.Interrupt:
-			// this also closes listeners
-			interrupted()
-			return
-		default:
-			break
-		}
-	}
+	}(chnl)
 }
 
 // win32 interrupt handler