Change back service name to MySQL

Don't add service name to read config file segments if it's "MySQL"
Fixed possible memory leak when CHANGE USER failed.

include/mysql_com.h

@@ -31,7 +31,7 @@
 
 #if defined(__WIN__) && !defined( _CUSTOMCONFIG_)
 #define MYSQL_NAMEDPIPE "MySQL"
-#define MYSQL_SERVICENAME "mysqld"
+#define MYSQL_SERVICENAME "MySQL"
 #endif /* __WIN__ */
 
 enum enum_server_command {

myisam/myisamchk.c

@@ -401,7 +401,9 @@ static void usage(void)
  		      Change the character set used by the index\n\
   -q, --quick         Faster repair by not modifying the data file.\n\
                       One can give a second '-q' to force myisamchk to\n\
-		      modify the original datafile in case of duplicate keys\n\
+		      modify the original datafile in case of duplicate keys.\n\
+		      NOTE: Tables where the data file is currupted can't be\n\
+		      fixed with this option.\n\
   -u, --unpack        Unpack file packed with myisampack.\n\
 ");
 
@@ -1094,7 +1096,7 @@ static int myisamchk(MI_CHECK *param, my_string filename)
 		   filename));
       if (param->testflag & T_REP_ANY)
 	VOID(fprintf(stderr,
-		     "Try fixing it by using the --safe-recover (-o) or the --force (-f) option\n"));
+		     "Try fixing it by using the --safe-recover (-o), the --force (-f) option or by not using the --quick (-q) flag\n"));
     }
     else if (!(param->error_printed & 2) &&
 	     !(param->testflag & T_FORCE_CREATE))

sql/mysqld.cc

@@ -2615,10 +2615,16 @@ int main(int argc, char **argv)
       if (!default_service_handling(argv, MYSQL_SERVICENAME, MYSQL_SERVICENAME,
 				   file_path, ""))
 	return 0;
-      if (Service.IsService(argv[1]))
+      if (Service.IsService(argv[1]))        /* Start an optional service */
       {
-        /* start an optional service */
-        load_default_groups[3]= argv[1];
+	/*
+	  Only add the service name to the groups read from the config file
+	  if it's not "MySQL". (The default service name should be 'mysqld'
+	  but we started a bad tradition by calling it MySQL from the start
+	  and we are now stuck with it.
+	*/
+	if (my_strcasecmp(argv[1],"mysql"))
+	  load_default_groups[3]= argv[1];
         start_mode= 1;
         Service.Init(argv[1], mysql_service);
         return 0;

sql/sql_parse.cc

@@ -1013,14 +1013,17 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
     char *save_user=	    thd->user;
     char *save_priv_user=   thd->priv_user;
     char *save_db=	    thd->db;
-    thd->user=0;
-    USER_CONN *save_uc=            thd->user_connect;
+    USER_CONN *save_user_connect= thd->user_connect;
 
     if ((uint) ((uchar*) db - net->read_pos) > packet_length)
     {						// Check if protocol is ok
       send_error(net, ER_UNKNOWN_COM_ERROR);
       break;
     }
+
+    /* Clear variables that are allocated */
+    thd->user= 0;
+    thd->user_connect= 0;
     if (check_user(thd, COM_CHANGE_USER, user, passwd, db, 0))
     {						// Restore old user
       x_free(thd->user);
@@ -1030,10 +1033,11 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
       thd->db_length=save_db_length;
       thd->user=save_user;
       thd->priv_user=save_priv_user;
+      thd->user_connect= save_user_connect;
       break;
     }
-    if (save_uc)
-      decrease_user_connections(save_uc);
+    if (save_user_connect)
+      decrease_user_connections(save_user_connect);
     x_free((gptr) save_db);
     x_free((gptr) save_user);
     break;