From 94094640e63fc5c0e3f3c696daf112870afb4629 Mon Sep 17 00:00:00 2001
From: TonyChyi <tonychee1989@gmail.com>
Date: Tue, 20 Mar 2018 10:08:53 +0800
Subject: [PATCH] fix FUCK! Well

---
 backend/alsa_wrapper/alsa_wrapper.go | 9 ++++++---
 backend/midiDevice_linux.go          | 5 ++++-
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/backend/alsa_wrapper/alsa_wrapper.go b/backend/alsa_wrapper/alsa_wrapper.go
index c84c20d..e4260da 100644
--- a/backend/alsa_wrapper/alsa_wrapper.go
+++ b/backend/alsa_wrapper/alsa_wrapper.go
@@ -30,6 +30,7 @@ func NewClient(name string) error {
 			return fmt.Errorf("Error while setting sequencer name. %d", errCode)
 		}
 	}
+	return nil
 }
 
 // NewPort to reigister new MIDI port.
@@ -40,6 +41,7 @@ func NewPort(name string) error {
 	if status != 0 {
 		return fmt.Errorf("Error while createing sequencer port. %d", status)
 	}
+	return nil
 }
 
 // SendData to ALSA
@@ -51,13 +53,14 @@ func SendData(p []byte) error {
 		stage, errCode := resolveErrCode(status)
 		switch stage {
 		case 1:
-			return 0, fmt.Errorf("Error while creating MIDI event. %d", errCode)
+			return fmt.Errorf("Error while creating MIDI event. %d", errCode)
 		case 2:
-			return 0, fmt.Errorf("Error while encoding MIDI event. %d", errCode)
+			return fmt.Errorf("Error while encoding MIDI event. %d", errCode)
 		case 3:
-			return 0, fmt.Errorf("Error while sending data. %d", errCode)
+			return fmt.Errorf("Error while sending data. %d", errCode)
 		}
 	}
+	return nil
 }
 
 func resolveErrCode(code int) (int, int) {
diff --git a/backend/midiDevice_linux.go b/backend/midiDevice_linux.go
index 4cc9e6a..e6bc1ff 100644
--- a/backend/midiDevice_linux.go
+++ b/backend/midiDevice_linux.go
@@ -36,7 +36,10 @@ func (midiDev *MIDIDevice) Init() error {
 
 func (midiDev *MIDIDevice) Write(p []byte) (int, error) {
 	midiDev.Signal <- 1
-	alsa.SendData(p)
+	err := alsa.SendData(p)
+	if err != nil {
+		return 0, err
+	}
 	return len(p), nil
 }