is this okay?

backend/alsa_wrapper/alsa_wrapper.go

@@ -0,0 +1,65 @@
+package alsa_wrapper
+
+/*
+#ifndef ARREMI
+#define ARREMI
+#cgo LDFLAGS: -lasound
+#include <stdlib.h>
+#include "alsa_wrapper.h"
+#endif
+*/
+import "C"
+import (
+	"fmt"
+	"unsafe"
+)
+
+// NewClient to register new ALSA client.
+func NewClient(name string) error {
+	cDevName := C.CString(name)
+	defer C.free(unsafe.Pointer(cDevName))
+	status = int(C.new_client(cDevName))
+	if status != 0 {
+		stage, errCode := resolveErrCode(status)
+		switch stage {
+		case 1:
+			return fmt.Errorf("Error while opening sequencer. %d", errCode)
+		case 2:
+			return fmt.Errorf("Error while getting sequencer id. %d", errCode)
+		case 3:
+			return fmt.Errorf("Error while setting sequencer name. %d", errCode)
+		}
+	}
+}
+
+// NewPort to reigister new MIDI port.
+func NewPort(name string) error {
+	cPortName := C.CString(name)
+	defer C.free(unsafe.Pointer(cPortName))
+	status = int(C.new_port(cPortName))
+	if status != 0 {
+		return fmt.Errorf("Error while createing sequencer port. %d", status)
+	}
+}
+
+// SendData to ALSA
+func SendData(p []byte) error {
+	cData := (*C.char)(unsafe.Pointer(&p[0]))
+	defer C.free(unsafe.Pointer(cData))
+	var status = int(C.send_data(cData, C.int(len(p))))
+	if status != 0 {
+		stage, errCode := resolveErrCode(status)
+		switch stage {
+		case 1:
+			return 0, fmt.Errorf("Error while creating MIDI event. %d", errCode)
+		case 2:
+			return 0, fmt.Errorf("Error while encoding MIDI event. %d", errCode)
+		case 3:
+			return 0, fmt.Errorf("Error while sending data. %d", errCode)
+		}
+	}
+}
+
+func resolveErrCode(code int) (int, int) {
+	return code >> 16, code & 0xffff
+}