fix:logger return writer

lib/log/logger.go

@@ -247,7 +247,7 @@ func (s *EmsLogger) SetLevel(l LogLevel) {
 
 var Elogger Logger
 
-func InitLogger(logFile string, period int, count int, prefix string, logLevel LogLevel) {
+func InitLogger(logFile string, period int, count int, prefix string, logLevel LogLevel) io.Writer {
 
 	/*
 		logFile, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0766)
@@ -259,6 +259,7 @@ func InitLogger(logFile string, period int, count int, prefix string, logLevel L
 	logWriter := getLogWriter(logFile, period, count)
 	Elogger = NewEmsLogger3(logWriter, prefix, DEFAULT_LOG_FLAG, logLevel)
 	fmt.Printf("logFile=%s, period=%d, count=%d, prefix=%s, logLevel=%s\n", logFile, period, count, prefix, GetLevelString())
+	return logWriter
 }
 
 // Trace implement ILogger