fix the bug that the setLocale function return wrong value to cause both the...

fix the bug that the setLocale function return wrong value to cause both the TDengine and Shell fail to launch.#494 #478

src/util/src/tglobalcfg.c

@@ -831,6 +831,12 @@ void tsSetAllDebugFlag() {
   pPrint("all debug flag are set to %d", debugFlag);
 }
 
+/**
+ * In some Linux systems, setLocale(LC_CTYPE, "") may return NULL, in which case the launch of
+ * both the TDengine Server and the Client may be interrupted.
+ *
+ * In case that the setLocale failed to be executed, the right charset needs to be set.
+ */
 void tsSetLocale() {
   char msgLocale[] = "Invalid locale:%s, please set the valid locale in config file";
   char msgCharset[] = "Invalid charset:%s, please set the valid charset in config file";
@@ -838,11 +844,10 @@ void tsSetLocale() {
 
   char *locale = setlocale(LC_CTYPE, tsLocale);
 
-  /* default locale or user specified locale is not valid, abort launch */
+  // default locale or user specified locale is not valid, abort launch
   if (locale == NULL) {
     printf(msgLocale, tsLocale);
     pPrint(msgLocale, tsLocale);
-    exit(-1);
   }
 
   if (strlen(tsCharset) == 0) {