Bug#14057 mysql_ping() handles TCP and UNIX socket connections in different ways

 - Retry the ping if reconnect is turned on and the error was CR_SERVER_LOST

libmysql/libmysql.c

@@ -1370,8 +1370,12 @@ mysql_stat(MYSQL *mysql)
 int STDCALL
 mysql_ping(MYSQL *mysql)
 {
+  int res;
   DBUG_ENTER("mysql_ping");
-  DBUG_RETURN(simple_command(mysql,COM_PING,0,0,0));
+  res= simple_command(mysql,COM_PING,0,0,0);
+  if (res == CR_SERVER_LOST && mysql->reconnect)
+    res= simple_command(mysql,COM_PING,0,0,0);
+  DBUG_RETURN(res);
 }