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/* Copyright (C) 2000-2003 MySQL AB
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/*
  Handling of MySQL SQL variables

  To add a new variable, one has to do the following:

  - Use one of the 'sys_var... classes from set_var.h or write a specific
    one for the variable type.
  - Define it in the 'variable definition list' in this file.
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  - If the variable should be changeable or one should be able to access it
    with @@variable_name, it should be added to the 'list of all variables'
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    list (sys_variables) in this file.
  - If the variable is thread specific, add it to 'system_variables' struct.
    If not, add it to mysqld.cc and an declaration in 'mysql_priv.h'
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  - If the variable should be changed from the command line, add a definition
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    of it in the my_option structure list in mysqld.cc
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  - Don't forget to initialize new fields in global_system_variables and
    max_system_variables!
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  - If the variable should show up in 'show variables' add it to the
    init_vars[] struct in this file

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  NOTES:
    - Be careful with var->save_result: sys_var::check() only updates
    ulonglong_value; so other members of the union are garbage then; to use
    them you must first assign a value to them (in specific ::check() for
    example).

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  TODO:
    - Add full support for the variable character_set (for 4.1)

    - When updating myisam_delay_key_write, we should do a 'flush tables'
      of all MyISAM tables to ensure that they are reopen with the
      new attribute.
*/

#ifdef __GNUC__
#pragma implementation				// gcc: Class implementation
#endif

#include "mysql_priv.h"
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#include <mysql.h>
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#include "slave.h"
#include <my_getopt.h>
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#include <thr_alarm.h>
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#include <myisam.h>
#ifdef HAVE_BERKELEY_DB
#include "ha_berkeley.h"
#endif
#ifdef HAVE_INNOBASE_DB
#include "ha_innodb.h"
#endif
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#ifdef HAVE_NDBCLUSTER_DB
#include "ha_ndbcluster.h"
#endif
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static HASH system_variable_hash;
const char *bool_type_names[]= { "OFF", "ON", NullS };
TYPELIB bool_typelib=
{
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  array_elements(bool_type_names)-1, "", bool_type_names, NULL
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};

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const char *delay_key_write_type_names[]= { "OFF", "ON", "ALL", NullS };
TYPELIB delay_key_write_typelib=
{
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  array_elements(delay_key_write_type_names)-1, "",
  delay_key_write_type_names, NULL
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};

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static int sys_check_charset(THD *thd, set_var *var);
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static bool sys_update_charset(THD *thd, set_var *var);
static void sys_set_default_charset(THD *thd, enum_var_type type);
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static int  sys_check_ftb_syntax(THD *thd,  set_var *var);
static bool sys_update_ftb_syntax(THD *thd, set_var * var);
static void sys_default_ftb_syntax(THD *thd, enum_var_type type);
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static bool sys_update_init_connect(THD*, set_var*);
static void sys_default_init_connect(THD*, enum_var_type type);
static bool sys_update_init_slave(THD*, set_var*);
static void sys_default_init_slave(THD*, enum_var_type type);
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static bool set_option_bit(THD *thd, set_var *var);
static bool set_option_autocommit(THD *thd, set_var *var);
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static int  check_log_update(THD *thd, set_var *var);
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static bool set_log_update(THD *thd, set_var *var);
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static int  check_pseudo_thread_id(THD *thd, set_var *var);
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static bool set_log_bin(THD *thd, set_var *var);
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static void fix_low_priority_updates(THD *thd, enum_var_type type);
static void fix_tx_isolation(THD *thd, enum_var_type type);
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static int check_completion_type(THD *thd, set_var *var);
static void fix_completion_type(THD *thd, enum_var_type type);
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static void fix_net_read_timeout(THD *thd, enum_var_type type);
static void fix_net_write_timeout(THD *thd, enum_var_type type);
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static void fix_net_retry_count(THD *thd, enum_var_type type);
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static void fix_max_join_size(THD *thd, enum_var_type type);
static void fix_query_cache_size(THD *thd, enum_var_type type);
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static void fix_query_cache_min_res_unit(THD *thd, enum_var_type type);
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static void fix_myisam_max_extra_sort_file_size(THD *thd, enum_var_type type);
static void fix_myisam_max_sort_file_size(THD *thd, enum_var_type type);
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static void fix_max_binlog_size(THD *thd, enum_var_type type);
static void fix_max_relay_log_size(THD *thd, enum_var_type type);
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static void fix_max_connections(THD *thd, enum_var_type type);
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static int check_max_delayed_threads(THD *thd, set_var *var);
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static void fix_thd_mem_root(THD *thd, enum_var_type type);
static void fix_trans_mem_root(THD *thd, enum_var_type type);
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static void fix_server_id(THD *thd, enum_var_type type);
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static KEY_CACHE *create_key_cache(const char *name, uint length);
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void fix_sql_mode_var(THD *thd, enum_var_type type);
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static byte *get_error_count(THD *thd);
static byte *get_warning_count(THD *thd);
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/*
  Variable definition list

  These are variables that can be set from the command line, in
  alphabetic order
*/

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sys_var_thd_ulong	sys_auto_increment_increment("auto_increment_increment",
                                                     &SV::auto_increment_increment);
sys_var_thd_ulong	sys_auto_increment_offset("auto_increment_offset",
                                                  &SV::auto_increment_offset);

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sys_var_bool_ptr	sys_automatic_sp_privileges("automatic_sp_privileges",
					      &sp_automatic_privileges);

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sys_var_long_ptr	sys_binlog_cache_size("binlog_cache_size",
					      &binlog_cache_size);
sys_var_thd_ulong	sys_bulk_insert_buff_size("bulk_insert_buffer_size",
						  &SV::bulk_insert_buff_size);
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sys_var_character_set_server	sys_character_set_server("character_set_server");
sys_var_str			sys_charset_system("character_set_system",
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				    sys_check_charset,
				    sys_update_charset,
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				    sys_set_default_charset,
                                    (char *)my_charset_utf8_general_ci.name);
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sys_var_character_set_database	sys_character_set_database("character_set_database");
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sys_var_character_set_client  sys_character_set_client("character_set_client");
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sys_var_character_set_connection  sys_character_set_connection("character_set_connection");
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sys_var_character_set_results sys_character_set_results("character_set_results");
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sys_var_thd_ulong	sys_completion_type("completion_type",
					 &SV::completion_type,
					 check_completion_type,
					 fix_completion_type);
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sys_var_collation_connection sys_collation_connection("collation_connection");
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sys_var_collation_database sys_collation_database("collation_database");
sys_var_collation_server sys_collation_server("collation_server");
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sys_var_bool_ptr	sys_concurrent_insert("concurrent_insert",
					      &myisam_concurrent_insert);
sys_var_long_ptr	sys_connect_timeout("connect_timeout",
					    &connect_timeout);
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sys_var_enum		sys_delay_key_write("delay_key_write",
					    &delay_key_write_options,
					    &delay_key_write_typelib,
					    fix_delay_key_write);
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sys_var_long_ptr	sys_delayed_insert_limit("delayed_insert_limit",
						 &delayed_insert_limit);
sys_var_long_ptr	sys_delayed_insert_timeout("delayed_insert_timeout",
						   &delayed_insert_timeout);
sys_var_long_ptr	sys_delayed_queue_size("delayed_queue_size",
					       &delayed_queue_size);
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sys_var_long_ptr	sys_expire_logs_days("expire_logs_days",
					     &expire_logs_days);
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sys_var_bool_ptr	sys_flush("flush", &myisam_flush);
sys_var_long_ptr	sys_flush_time("flush_time", &flush_time);
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sys_var_str             sys_ft_boolean_syntax("ft_boolean_syntax",
                                         sys_check_ftb_syntax,
                                         sys_update_ftb_syntax,
                                         sys_default_ftb_syntax,
                                         ft_boolean_syntax);
sys_var_str             sys_init_connect("init_connect", 0,
                                         sys_update_init_connect,
                                         sys_default_init_connect,0);
sys_var_str             sys_init_slave("init_slave", 0,
                                       sys_update_init_slave,
                                       sys_default_init_slave,0);
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sys_var_thd_ulong	sys_interactive_timeout("interactive_timeout",
						&SV::net_interactive_timeout);
sys_var_thd_ulong	sys_join_buffer_size("join_buffer_size",
					     &SV::join_buff_size);
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sys_var_key_buffer_size	sys_key_buffer_size("key_buffer_size");
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sys_var_key_cache_long  sys_key_cache_block_size("key_cache_block_size",
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						 offsetof(KEY_CACHE,
							  param_block_size));
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sys_var_key_cache_long	sys_key_cache_division_limit("key_cache_division_limit",
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						     offsetof(KEY_CACHE,
							      param_division_limit));
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sys_var_key_cache_long  sys_key_cache_age_threshold("key_cache_age_threshold",
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						     offsetof(KEY_CACHE,
							      param_age_threshold));
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sys_var_bool_ptr	sys_local_infile("local_infile",
					 &opt_local_infile);
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sys_var_thd_ulong	sys_log_warnings("log_warnings", &SV::log_warnings);
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sys_var_thd_ulong	sys_long_query_time("long_query_time",
					     &SV::long_query_time);
sys_var_thd_bool	sys_low_priority_updates("low_priority_updates",
						 &SV::low_priority_updates,
						 fix_low_priority_updates);
#ifndef TO_BE_DELETED	/* Alias for the low_priority_updates */
sys_var_thd_bool	sys_sql_low_priority_updates("sql_low_priority_updates",
						     &SV::low_priority_updates,
						     fix_low_priority_updates);
#endif
sys_var_thd_ulong	sys_max_allowed_packet("max_allowed_packet",
					       &SV::max_allowed_packet);
sys_var_long_ptr	sys_max_binlog_cache_size("max_binlog_cache_size",
						  &max_binlog_cache_size);
sys_var_long_ptr	sys_max_binlog_size("max_binlog_size",
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					    &max_binlog_size,
                                            fix_max_binlog_size);
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sys_var_long_ptr	sys_max_connections("max_connections",
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					    &max_connections,
                                            fix_max_connections);
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sys_var_long_ptr	sys_max_connect_errors("max_connect_errors",
					       &max_connect_errors);
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sys_var_thd_ulong       sys_max_insert_delayed_threads("max_insert_delayed_threads",
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						       &SV::max_insert_delayed_threads,
                                                       check_max_delayed_threads,
                                                       fix_max_connections);
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sys_var_thd_ulong	sys_max_delayed_threads("max_delayed_threads",
						&SV::max_insert_delayed_threads,
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                                                check_max_delayed_threads,
                                                fix_max_connections);
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sys_var_thd_ulong	sys_max_error_count("max_error_count",
					    &SV::max_error_count);
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sys_var_thd_ulong	sys_max_heap_table_size("max_heap_table_size",
						&SV::max_heap_table_size);
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sys_var_thd_ulong       sys_pseudo_thread_id("pseudo_thread_id",
					     &SV::pseudo_thread_id,
                                             check_pseudo_thread_id, 0);
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sys_var_thd_ha_rows	sys_max_join_size("max_join_size",
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					  &SV::max_join_size,
					  fix_max_join_size);
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sys_var_thd_ulong	sys_max_seeks_for_key("max_seeks_for_key",
					      &SV::max_seeks_for_key);
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sys_var_thd_ulong   sys_max_length_for_sort_data("max_length_for_sort_data",
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                                                 &SV::max_length_for_sort_data);
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#ifndef TO_BE_DELETED	/* Alias for max_join_size */
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sys_var_thd_ha_rows	sys_sql_max_join_size("sql_max_join_size",
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					      &SV::max_join_size,
					      fix_max_join_size);
#endif
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sys_var_long_ptr	sys_max_relay_log_size("max_relay_log_size",
                                               &max_relay_log_size,
                                               fix_max_relay_log_size);
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sys_var_thd_ulong	sys_max_sort_length("max_sort_length",
					    &SV::max_sort_length);
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sys_var_max_user_conn   sys_max_user_connections("max_user_connections");
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sys_var_thd_ulong	sys_max_tmp_tables("max_tmp_tables",
					   &SV::max_tmp_tables);
sys_var_long_ptr	sys_max_write_lock_count("max_write_lock_count",
						 &max_write_lock_count);
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sys_var_thd_ulong       sys_multi_range_count("multi_range_count",
                                              &SV::multi_range_count);
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sys_var_long_ptr	sys_myisam_data_pointer_size("myisam_data_pointer_size",
                                                    &myisam_data_pointer_size);
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sys_var_thd_ulonglong	sys_myisam_max_extra_sort_file_size("myisam_max_extra_sort_file_size", &SV::myisam_max_extra_sort_file_size, fix_myisam_max_extra_sort_file_size, 1);
sys_var_thd_ulonglong	sys_myisam_max_sort_file_size("myisam_max_sort_file_size", &SV::myisam_max_sort_file_size, fix_myisam_max_sort_file_size, 1);
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sys_var_thd_ulong       sys_myisam_repair_threads("myisam_repair_threads", &SV::myisam_repair_threads);
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sys_var_thd_ulong	sys_myisam_sort_buffer_size("myisam_sort_buffer_size", &SV::myisam_sort_buff_size);
sys_var_thd_ulong	sys_net_buffer_length("net_buffer_length",
					      &SV::net_buffer_length);
sys_var_thd_ulong	sys_net_read_timeout("net_read_timeout",
					     &SV::net_read_timeout,
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					     0, fix_net_read_timeout);
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sys_var_thd_ulong	sys_net_write_timeout("net_write_timeout",
					      &SV::net_write_timeout,
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					      0, fix_net_write_timeout);
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sys_var_thd_ulong	sys_net_retry_count("net_retry_count",
					    &SV::net_retry_count,
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					    0, fix_net_retry_count);
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sys_var_thd_bool	sys_new_mode("new", &SV::new_mode);
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sys_var_thd_bool	sys_old_passwords("old_passwords", &SV::old_passwords);
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sys_var_thd_ulong       sys_optimizer_prune_level("optimizer_prune_level",
                                                  &SV::optimizer_prune_level);
sys_var_thd_ulong       sys_optimizer_search_depth("optimizer_search_depth",
                                                   &SV::optimizer_search_depth);
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sys_var_thd_ulong       sys_preload_buff_size("preload_buffer_size",
                                              &SV::preload_buff_size);
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sys_var_thd_ulong	sys_read_buff_size("read_buffer_size",
					   &SV::read_buff_size);
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sys_var_bool_ptr	sys_readonly("read_only", &opt_readonly);
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sys_var_thd_ulong	sys_read_rnd_buff_size("read_rnd_buffer_size",
					       &SV::read_rnd_buff_size);
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#ifdef HAVE_REPLICATION
sys_var_bool_ptr	sys_relay_log_purge("relay_log_purge",
                                            &relay_log_purge);
#endif
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sys_var_long_ptr	sys_rpl_recovery_rank("rpl_recovery_rank",
					      &rpl_recovery_rank);
sys_var_long_ptr	sys_query_cache_size("query_cache_size",
					     &query_cache_size,
					     fix_query_cache_size);
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sys_var_thd_ulong	sys_range_alloc_block_size("range_alloc_block_size",
						   &SV::range_alloc_block_size);
sys_var_thd_ulong	sys_query_alloc_block_size("query_alloc_block_size",
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						   &SV::query_alloc_block_size,
						   0, fix_thd_mem_root);
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sys_var_thd_ulong	sys_query_prealloc_size("query_prealloc_size",
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						&SV::query_prealloc_size,
						0, fix_thd_mem_root);
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sys_var_thd_ulong	sys_trans_alloc_block_size("transaction_alloc_block_size",
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						   &SV::trans_alloc_block_size,
						   0, fix_trans_mem_root);
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sys_var_thd_ulong	sys_trans_prealloc_size("transaction_prealloc_size",
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						&SV::trans_prealloc_size,
						0, fix_trans_mem_root);
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#ifdef HAVE_QUERY_CACHE
sys_var_long_ptr	sys_query_cache_limit("query_cache_limit",
					      &query_cache.query_cache_limit);
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sys_var_long_ptr        sys_query_cache_min_res_unit("query_cache_min_res_unit",
						     &query_cache_min_res_unit,
						     fix_query_cache_min_res_unit);
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sys_var_thd_enum	sys_query_cache_type("query_cache_type",
					     &SV::query_cache_type,
					     &query_cache_type_typelib);
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sys_var_thd_bool
sys_query_cache_wlock_invalidate("query_cache_wlock_invalidate",
				 &SV::query_cache_wlock_invalidate);
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#endif /* HAVE_QUERY_CACHE */
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sys_var_bool_ptr	sys_secure_auth("secure_auth", &opt_secure_auth);
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sys_var_long_ptr	sys_server_id("server_id", &server_id, fix_server_id);
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sys_var_bool_ptr	sys_slave_compressed_protocol("slave_compressed_protocol",
						      &opt_slave_compressed_protocol);
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#ifdef HAVE_REPLICATION
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sys_var_long_ptr	sys_slave_net_timeout("slave_net_timeout",
					      &slave_net_timeout);
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sys_var_long_ptr	sys_slave_trans_retries("slave_transaction_retries",
                                                &slave_trans_retries);
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#endif
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sys_var_long_ptr	sys_slow_launch_time("slow_launch_time",
					     &slow_launch_time);
sys_var_thd_ulong	sys_sort_buffer("sort_buffer_size",
					&SV::sortbuff_size);
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sys_var_thd_sql_mode    sys_sql_mode("sql_mode",
                                     &SV::sql_mode);
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sys_var_thd_enum
sys_updatable_views_with_limit("updatable_views_with_limit",
                               &SV::updatable_views_with_limit,
                               &updatable_views_with_limit_typelib);
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sys_var_thd_table_type  sys_table_type("table_type",
				       &SV::table_type);
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sys_var_thd_storage_engine sys_storage_engine("storage_engine",
				       &SV::table_type);
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#ifdef HAVE_REPLICATION
sys_var_sync_binlog_period sys_sync_binlog_period("sync_binlog", &sync_binlog_period);
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sys_var_thd_ulong	sys_sync_replication("sync_replication",
                                               &SV::sync_replication);
sys_var_thd_ulong	sys_sync_replication_slave_id(
						"sync_replication_slave_id",
                                               &SV::sync_replication_slave_id);
sys_var_thd_ulong	sys_sync_replication_timeout(
						"sync_replication_timeout",
                                               &SV::sync_replication_timeout);
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#endif
sys_var_bool_ptr	sys_sync_frm("sync_frm", &opt_sync_frm);
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sys_var_long_ptr	sys_table_cache_size("table_cache",
					     &table_cache_size);
sys_var_long_ptr	sys_thread_cache_size("thread_cache_size",
					      &thread_cache_size);
sys_var_thd_enum	sys_tx_isolation("tx_isolation",
					 &SV::tx_isolation,
					 &tx_isolation_typelib,
					 fix_tx_isolation);
sys_var_thd_ulong	sys_tmp_table_size("tmp_table_size",
					   &SV::tmp_table_size);
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sys_var_bool_ptr  sys_timed_mutexes("timed_mutexes",
                                    &timed_mutexes);
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sys_var_thd_ulong	sys_net_wait_timeout("wait_timeout",
					     &SV::net_wait_timeout);
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#ifdef HAVE_INNOBASE_DB
sys_var_long_ptr        sys_innodb_max_dirty_pages_pct("innodb_max_dirty_pages_pct",
                                                        &srv_max_buf_pool_modified_pct);
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sys_var_long_ptr	sys_innodb_max_purge_lag("innodb_max_purge_lag",
							&srv_max_purge_lag);
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sys_var_thd_bool	sys_innodb_table_locks("innodb_table_locks",
                                               &SV::innodb_table_locks);
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sys_var_thd_bool	sys_innodb_support_xa("innodb_support_xa",
                                               &SV::innodb_support_xa);
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sys_var_long_ptr	sys_innodb_autoextend_increment("innodb_autoextend_increment",
							&srv_auto_extend_increment);
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sys_var_long_ptr	sys_innodb_sync_spin_loops("innodb_sync_spin_loops",
                                             &srv_n_spin_wait_rounds);
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sys_var_long_ptr  sys_innodb_concurrency_tickets("innodb_concurrency_tickets",
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                                             &srv_n_free_tickets_to_enter);
sys_var_long_ptr  sys_innodb_thread_sleep_delay("innodb_thread_sleep_delay",
                                                &srv_thread_sleep_delay);
sys_var_long_ptr  sys_innodb_thread_concurrency("innodb_thread_concurrency",
                                                &srv_thread_concurrency);
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#endif
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/* Condition pushdown to storage engine */
sys_var_thd_bool
sys_engine_condition_pushdown("engine_condition_pushdown",
			      &SV::engine_condition_pushdown);

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#ifdef HAVE_NDBCLUSTER_DB
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/* ndb thread specific variable settings */
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sys_var_thd_ulong
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sys_ndb_autoincrement_prefetch_sz("ndb_autoincrement_prefetch_sz",
				  &SV::ndb_autoincrement_prefetch_sz);
sys_var_thd_bool
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sys_ndb_force_send("ndb_force_send", &SV::ndb_force_send);
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sys_var_thd_bool
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sys_ndb_use_exact_count("ndb_use_exact_count", &SV::ndb_use_exact_count);
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sys_var_thd_bool
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sys_ndb_use_transactions("ndb_use_transactions", &SV::ndb_use_transactions);
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sys_var_long_ptr
sys_ndb_cache_check_time("ndb_cache_check_time", &ndb_cache_check_time);
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#endif
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/* Time/date/datetime formats */

sys_var_thd_date_time_format sys_time_format("time_format",
					     &SV::time_format,
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					     MYSQL_TIMESTAMP_TIME);
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sys_var_thd_date_time_format sys_date_format("date_format",
					     &SV::date_format,
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					     MYSQL_TIMESTAMP_DATE);
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sys_var_thd_date_time_format sys_datetime_format("datetime_format",
						 &SV::datetime_format,
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						 MYSQL_TIMESTAMP_DATETIME);
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/* Variables that are bits in THD */
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static sys_var_thd_bit	sys_autocommit("autocommit", 0,
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				       set_option_autocommit,
				       OPTION_NOT_AUTOCOMMIT,
				       1);
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static sys_var_thd_bit	sys_big_tables("big_tables", 0,
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				       set_option_bit,
				       OPTION_BIG_TABLES);
#ifndef TO_BE_DELETED	/* Alias for big_tables */
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static sys_var_thd_bit	sys_sql_big_tables("sql_big_tables", 0,
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					   set_option_bit,
					   OPTION_BIG_TABLES);
#endif
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static sys_var_thd_bit	sys_big_selects("sql_big_selects", 0,
456
					set_option_bit,
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					OPTION_BIG_SELECTS);
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static sys_var_thd_bit	sys_log_off("sql_log_off", 0,
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				    set_option_bit,
				    OPTION_LOG_OFF);
static sys_var_thd_bit	sys_log_update("sql_log_update",
462
                                       check_log_update,
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				       set_log_update,
				       OPTION_UPDATE_LOG);
static sys_var_thd_bit	sys_log_binlog("sql_log_bin",
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                                       check_log_update,
				       set_log_bin,
				       OPTION_BIN_LOG);
static sys_var_thd_bit	sys_sql_warnings("sql_warnings", 0,
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					 set_option_bit,
					 OPTION_WARNINGS);
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static sys_var_thd_bit	sys_sql_notes("sql_notes", 0,
					 set_option_bit,
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					 OPTION_SQL_NOTES);
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static sys_var_thd_bit	sys_auto_is_null("sql_auto_is_null", 0,
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					 set_option_bit,
					 OPTION_AUTO_IS_NULL);
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static sys_var_thd_bit	sys_safe_updates("sql_safe_updates", 0,
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					 set_option_bit,
					 OPTION_SAFE_UPDATES);
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static sys_var_thd_bit	sys_buffer_results("sql_buffer_result", 0,
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					   set_option_bit,
					   OPTION_BUFFER_RESULT);
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static sys_var_thd_bit	sys_quote_show_create("sql_quote_show_create", 0,
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					      set_option_bit,
					      OPTION_QUOTE_SHOW_CREATE);
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static sys_var_thd_bit	sys_foreign_key_checks("foreign_key_checks", 0,
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					       set_option_bit,
					       OPTION_NO_FOREIGN_KEY_CHECKS,
					       1);
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static sys_var_thd_bit	sys_unique_checks("unique_checks", 0,
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					  set_option_bit,
					  OPTION_RELAXED_UNIQUE_CHECKS,
					  1);

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/* Local state variables */

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static sys_var_thd_ha_rows	sys_select_limit("sql_select_limit",
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						 &SV::select_limit);
static sys_var_timestamp	sys_timestamp("timestamp");
static sys_var_last_insert_id	sys_last_insert_id("last_insert_id");
static sys_var_last_insert_id	sys_identity("identity");
static sys_var_insert_id	sys_insert_id("insert_id");
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static sys_var_readonly		sys_error_count("error_count",
						OPT_SESSION,
						SHOW_LONG,
						get_error_count);
static sys_var_readonly		sys_warning_count("warning_count",
						  OPT_SESSION,
						  SHOW_LONG,
						  get_warning_count);

513
/* alias for last_insert_id() to be compatible with Sybase */
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#ifdef HAVE_REPLICATION
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static sys_var_slave_skip_counter sys_slave_skip_counter("sql_slave_skip_counter");
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#endif
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static sys_var_rand_seed1	sys_rand_seed1("rand_seed1");
static sys_var_rand_seed2	sys_rand_seed2("rand_seed2");
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static sys_var_thd_ulong        sys_default_week_format("default_week_format",
					                &SV::default_week_format);
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sys_var_thd_ulong               sys_group_concat_max_len("group_concat_max_len",
                                                         &SV::group_concat_max_len);

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sys_var_thd_time_zone            sys_time_zone("time_zone");
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/* Read only variables */

sys_var_const_str		sys_os("version_compile_os", SYSTEM_TYPE);
/* Global read-only variable describing server license */
532
sys_var_const_str		sys_license("license", STRINGIFY_ARG(LICENSE));
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/*
  List of all variables for initialisation and storage in hash
  This is sorted in alphabetical order to make it easy to add new variables

  If the variable is not in this list, it can't be changed with
  SET variable_name=
*/

sys_var *sys_variables[]=
{
  &sys_auto_is_null,
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  &sys_auto_increment_increment,
  &sys_auto_increment_offset,
548
  &sys_autocommit,
549
  &sys_automatic_sp_privileges,
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  &sys_big_tables,
  &sys_big_selects,
  &sys_binlog_cache_size,
  &sys_buffer_results,
  &sys_bulk_insert_buff_size,
555 556
  &sys_character_set_server,
  &sys_character_set_database,
557
  &sys_character_set_client,
558
  &sys_character_set_connection,
559
  &sys_character_set_results,
560
  &sys_collation_connection,
561 562
  &sys_collation_database,
  &sys_collation_server,
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  &sys_completion_type,
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  &sys_concurrent_insert,
  &sys_connect_timeout,
566 567
  &sys_date_format,
  &sys_datetime_format,
568
  &sys_default_week_format,
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  &sys_delay_key_write,
  &sys_delayed_insert_limit,
  &sys_delayed_insert_timeout,
  &sys_delayed_queue_size,
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  &sys_error_count,
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  &sys_expire_logs_days,
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  &sys_flush,
  &sys_flush_time,
577
  &sys_ft_boolean_syntax,
578
  &sys_foreign_key_checks,
579
  &sys_group_concat_max_len,
580
  &sys_identity,
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  &sys_init_connect,
  &sys_init_slave,
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  &sys_insert_id,
  &sys_interactive_timeout,
  &sys_join_buffer_size,
  &sys_key_buffer_size,
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  &sys_key_cache_block_size,
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  &sys_key_cache_division_limit,
  &sys_key_cache_age_threshold,
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  &sys_last_insert_id,
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  &sys_license,
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  &sys_local_infile,
  &sys_log_binlog,
  &sys_log_off,
  &sys_log_update,
  &sys_log_warnings,
  &sys_long_query_time,
  &sys_low_priority_updates,
  &sys_max_allowed_packet,
  &sys_max_binlog_cache_size,
  &sys_max_binlog_size,
  &sys_max_connect_errors,
  &sys_max_connections,
  &sys_max_delayed_threads,
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  &sys_max_error_count,
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  &sys_max_insert_delayed_threads,
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  &sys_max_heap_table_size,
  &sys_max_join_size,
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  &sys_max_length_for_sort_data,
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  &sys_max_relay_log_size,
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  &sys_max_seeks_for_key,
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  &sys_max_sort_length,
  &sys_max_tmp_tables,
  &sys_max_user_connections,
  &sys_max_write_lock_count,
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  &sys_multi_range_count,
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  &sys_myisam_data_pointer_size,
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  &sys_myisam_max_extra_sort_file_size,
  &sys_myisam_max_sort_file_size,
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  &sys_myisam_repair_threads,
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  &sys_myisam_sort_buffer_size,
  &sys_net_buffer_length,
  &sys_net_read_timeout,
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  &sys_net_retry_count,
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  &sys_net_wait_timeout,
  &sys_net_write_timeout,
627
  &sys_new_mode,
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  &sys_old_passwords,
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  &sys_optimizer_prune_level,
  &sys_optimizer_search_depth,
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  &sys_preload_buff_size,
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  &sys_pseudo_thread_id,
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  &sys_query_alloc_block_size,
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  &sys_query_cache_size,
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  &sys_query_prealloc_size,
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#ifdef HAVE_QUERY_CACHE
  &sys_query_cache_limit,
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  &sys_query_cache_min_res_unit,
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  &sys_query_cache_type,
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  &sys_query_cache_wlock_invalidate,
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#endif /* HAVE_QUERY_CACHE */
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  &sys_quote_show_create,
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  &sys_rand_seed1,
  &sys_rand_seed2,
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  &sys_range_alloc_block_size,
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  &sys_readonly,
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  &sys_read_buff_size,
  &sys_read_rnd_buff_size,
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#ifdef HAVE_REPLICATION
  &sys_relay_log_purge,
#endif
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  &sys_rpl_recovery_rank,
  &sys_safe_updates,
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  &sys_secure_auth,
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  &sys_select_limit,
  &sys_server_id,
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#ifdef HAVE_REPLICATION
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  &sys_slave_compressed_protocol,
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  &sys_slave_net_timeout,
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  &sys_slave_trans_retries,
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  &sys_slave_skip_counter,
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#endif
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  &sys_slow_launch_time,
  &sys_sort_buffer,
  &sys_sql_big_tables,
  &sys_sql_low_priority_updates,
  &sys_sql_max_join_size,
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  &sys_sql_mode,
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  &sys_sql_warnings,
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  &sys_sql_notes,
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  &sys_storage_engine,
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#ifdef HAVE_REPLICATION
  &sys_sync_binlog_period,
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  &sys_sync_replication,
  &sys_sync_replication_slave_id,
  &sys_sync_replication_timeout,
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#endif
  &sys_sync_frm,
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  &sys_table_cache_size,
  &sys_table_type,
  &sys_thread_cache_size,
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  &sys_time_format,
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  &sys_timed_mutexes,
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  &sys_timestamp,
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  &sys_time_zone,
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  &sys_tmp_table_size,
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  &sys_trans_alloc_block_size,
  &sys_trans_prealloc_size,
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  &sys_tx_isolation,
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  &sys_os,
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#ifdef HAVE_INNOBASE_DB
  &sys_innodb_max_dirty_pages_pct,
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  &sys_innodb_max_purge_lag,
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  &sys_innodb_table_locks,
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  &sys_innodb_support_xa,
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  &sys_innodb_max_purge_lag,
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  &sys_innodb_autoextend_increment,
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  &sys_innodb_sync_spin_loops,
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  &sys_innodb_concurrency_tickets,
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  &sys_innodb_thread_sleep_delay,
  &sys_innodb_thread_concurrency,
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#endif  
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  &sys_engine_condition_pushdown,
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#ifdef HAVE_NDBCLUSTER_DB
  &sys_ndb_autoincrement_prefetch_sz,
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  &sys_ndb_cache_check_time,
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  &sys_ndb_force_send,
  &sys_ndb_use_exact_count,
  &sys_ndb_use_transactions,
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#endif
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  &sys_unique_checks,
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  &sys_updatable_views_with_limit,
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  &sys_warning_count
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};


/*
  Variables shown by SHOW variables in alphabetical order
*/

struct show_var_st init_vars[]= {
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  {"auto_increment_increment", (char*) &sys_auto_increment_increment, SHOW_SYS},
723
  {"auto_increment_offset",   (char*) &sys_auto_increment_offset, SHOW_SYS},
724
  {sys_automatic_sp_privileges.name,(char*) &sys_automatic_sp_privileges,       SHOW_SYS},
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  {"back_log",                (char*) &back_log,                    SHOW_LONG},
  {"basedir",                 mysql_home,                           SHOW_CHAR},
#ifdef HAVE_BERKELEY_DB
  {"bdb_cache_size",          (char*) &berkeley_cache_size,         SHOW_LONG},
  {"bdb_home",                (char*) &berkeley_home,               SHOW_CHAR_PTR},
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  {"bdb_log_buffer_size",     (char*) &berkeley_log_buffer_size,    SHOW_LONG},
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  {"bdb_logdir",              (char*) &berkeley_logdir,             SHOW_CHAR_PTR},
732
  {"bdb_max_lock",            (char*) &berkeley_max_lock,	    SHOW_LONG},
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  {"bdb_shared_data",	      (char*) &berkeley_shared_data,	    SHOW_BOOL},
  {"bdb_tmpdir",              (char*) &berkeley_tmpdir,             SHOW_CHAR_PTR},
#endif
  {sys_binlog_cache_size.name,(char*) &sys_binlog_cache_size,	    SHOW_SYS},
  {sys_bulk_insert_buff_size.name,(char*) &sys_bulk_insert_buff_size,SHOW_SYS},
738
  {sys_character_set_client.name,(char*) &sys_character_set_client, SHOW_SYS},
739
  {sys_character_set_connection.name,(char*) &sys_character_set_connection,SHOW_SYS},
740
  {sys_character_set_database.name, (char*) &sys_character_set_database,SHOW_SYS},
741
  {sys_character_set_results.name,(char*) &sys_character_set_results, SHOW_SYS},
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  {sys_character_set_server.name, (char*) &sys_character_set_server,SHOW_SYS},
  {sys_charset_system.name,   (char*) &sys_charset_system,          SHOW_SYS},
  {"character_sets_dir",      mysql_charsets_dir,                   SHOW_CHAR},
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  {sys_collation_connection.name,(char*) &sys_collation_connection, SHOW_SYS},
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  {sys_collation_database.name,(char*) &sys_collation_database,     SHOW_SYS},
  {sys_collation_server.name,(char*) &sys_collation_server,         SHOW_SYS},
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  {sys_completion_type.name,  (char*) &sys_completion_type,	    SHOW_SYS},
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  {sys_concurrent_insert.name,(char*) &sys_concurrent_insert,       SHOW_SYS},
  {sys_connect_timeout.name,  (char*) &sys_connect_timeout,         SHOW_SYS},
  {"datadir",                 mysql_real_data_home,                 SHOW_CHAR},
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  {sys_date_format.name,      (char*) &sys_date_format,		    SHOW_SYS},
  {sys_datetime_format.name,  (char*) &sys_datetime_format,	    SHOW_SYS},
  {sys_default_week_format.name, (char*) &sys_default_week_format,  SHOW_SYS},
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  {sys_delay_key_write.name,  (char*) &sys_delay_key_write,         SHOW_SYS},
  {sys_delayed_insert_limit.name, (char*) &sys_delayed_insert_limit,SHOW_SYS},
  {sys_delayed_insert_timeout.name, (char*) &sys_delayed_insert_timeout, SHOW_SYS},
  {sys_delayed_queue_size.name,(char*) &sys_delayed_queue_size,     SHOW_SYS},
759
  {sys_expire_logs_days.name, (char*) &sys_expire_logs_days,        SHOW_SYS},
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  {sys_flush.name,             (char*) &sys_flush,                  SHOW_SYS},
  {sys_flush_time.name,        (char*) &sys_flush_time,             SHOW_SYS},
762
  {sys_ft_boolean_syntax.name,(char*) &ft_boolean_syntax,	    SHOW_CHAR},
763
  {"ft_max_word_len",         (char*) &ft_max_word_len,             SHOW_LONG},
764
  {"ft_min_word_len",         (char*) &ft_min_word_len,             SHOW_LONG},
765
  {"ft_query_expansion_limit",(char*) &ft_query_expansion_limit,    SHOW_LONG},
766
  {"ft_stopword_file",        (char*) &ft_stopword_file,            SHOW_CHAR_PTR},
767
  {sys_group_concat_max_len.name, (char*) &sys_group_concat_max_len,  SHOW_SYS},
768
  {"have_archive",	      (char*) &have_archive_db,	            SHOW_HAVE},
769
  {"have_bdb",		      (char*) &have_berkeley_db,	    SHOW_HAVE},
770
  {"have_compress",	      (char*) &have_compress,		    SHOW_HAVE},
771
  {"have_crypt",	      (char*) &have_crypt,		    SHOW_HAVE},
772
  {"have_csv",	              (char*) &have_csv_db,	            SHOW_HAVE},
773
  {"have_example_engine",     (char*) &have_example_db,	            SHOW_HAVE},
774
  {"have_federated_engine",   (char*) &have_federated_db,           SHOW_HAVE},
775
  {"have_geometry",           (char*) &have_geometry,               SHOW_HAVE},
776
  {"have_innodb",	      (char*) &have_innodb,		    SHOW_HAVE},
777
  {"have_isam",		      (char*) &have_isam,		    SHOW_HAVE},
778
  {"have_ndbcluster",         (char*) &have_ndbcluster,             SHOW_HAVE},
779 780
  {"have_openssl",	      (char*) &have_openssl,		    SHOW_HAVE},
  {"have_query_cache",        (char*) &have_query_cache,            SHOW_HAVE},
781
  {"have_raid",		      (char*) &have_raid,		    SHOW_HAVE},
782
  {"have_rtree_keys",         (char*) &have_rtree_keys,             SHOW_HAVE},
783
  {"have_symlink",            (char*) &have_symlink,                SHOW_HAVE},
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  {"init_connect",            (char*) &sys_init_connect,            SHOW_SYS},
785
  {"init_file",               (char*) &opt_init_file,               SHOW_CHAR_PTR},
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  {"init_slave",              (char*) &sys_init_slave,              SHOW_SYS},
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#ifdef HAVE_INNOBASE_DB
  {"innodb_additional_mem_pool_size", (char*) &innobase_additional_mem_pool_size, SHOW_LONG },
789
  {sys_innodb_autoextend_increment.name, (char*) &sys_innodb_autoextend_increment, SHOW_SYS},
790
  {"innodb_buffer_pool_awe_mem_mb", (char*) &innobase_buffer_pool_awe_mem_mb, SHOW_LONG },
791
  {"innodb_buffer_pool_size", (char*) &innobase_buffer_pool_size, SHOW_LONG },
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  {"innodb_checksums", (char*) &innobase_use_checksums, SHOW_MY_BOOL},
  {sys_innodb_concurrency_tickets.name, (char*) &sys_innodb_concurrency_tickets, SHOW_SYS},
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  {"innodb_data_file_path", (char*) &innobase_data_file_path,	    SHOW_CHAR_PTR},
  {"innodb_data_home_dir",  (char*) &innobase_data_home_dir,	    SHOW_CHAR_PTR},
796
  {"innodb_doublewrite", (char*) &innobase_use_doublewrite, SHOW_MY_BOOL},
797
  {"innodb_fast_shutdown", (char*) &innobase_fast_shutdown, SHOW_MY_BOOL},
798
  {"innodb_file_io_threads", (char*) &innobase_file_io_threads, SHOW_LONG },
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  {"innodb_file_per_table", (char*) &innobase_file_per_table, SHOW_MY_BOOL},
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  {"innodb_flush_log_at_trx_commit", (char*) &innobase_flush_log_at_trx_commit, SHOW_INT},
801
  {"innodb_flush_method",    (char*) &innobase_unix_file_flush_method, SHOW_CHAR_PTR},
802
  {"innodb_force_recovery", (char*) &innobase_force_recovery, SHOW_LONG },
803
  {"innodb_lock_wait_timeout", (char*) &innobase_lock_wait_timeout, SHOW_LONG },
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  {"innodb_locks_unsafe_for_binlog", (char*) &innobase_locks_unsafe_for_binlog, SHOW_MY_BOOL},
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  {"innodb_log_arch_dir",   (char*) &innobase_log_arch_dir, 	    SHOW_CHAR_PTR},
  {"innodb_log_archive",    (char*) &innobase_log_archive, 	    SHOW_MY_BOOL},
  {"innodb_log_buffer_size", (char*) &innobase_log_buffer_size, SHOW_LONG },
  {"innodb_log_file_size", (char*) &innobase_log_file_size, SHOW_LONG},
  {"innodb_log_files_in_group", (char*) &innobase_log_files_in_group,	SHOW_LONG},
  {"innodb_log_group_home_dir", (char*) &innobase_log_group_home_dir, SHOW_CHAR_PTR},
811
  {sys_innodb_max_dirty_pages_pct.name, (char*) &sys_innodb_max_dirty_pages_pct, SHOW_SYS},
812
  {sys_innodb_max_purge_lag.name, (char*) &sys_innodb_max_purge_lag, SHOW_SYS},
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  {"innodb_mirrored_log_groups", (char*) &innobase_mirrored_log_groups, SHOW_LONG},
  {"innodb_open_files", (char*) &innobase_open_files, SHOW_LONG },
815
  {sys_innodb_sync_spin_loops.name, (char*) &sys_innodb_sync_spin_loops, SHOW_SYS},
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paul@kite-hub.kitebird.com committed
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  {sys_innodb_table_locks.name, (char*) &sys_innodb_table_locks, SHOW_SYS},
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  {sys_innodb_support_xa.name, (char*) &sys_innodb_support_xa, SHOW_SYS},
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  {sys_innodb_thread_concurrency.name, (char*) &sys_innodb_thread_concurrency, SHOW_SYS},
  {sys_innodb_thread_sleep_delay.name, (char*) &sys_innodb_thread_sleep_delay, SHOW_SYS},
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#endif
  {sys_interactive_timeout.name,(char*) &sys_interactive_timeout,   SHOW_SYS},
  {sys_join_buffer_size.name,   (char*) &sys_join_buffer_size,	    SHOW_SYS},
  {sys_key_buffer_size.name,	(char*) &sys_key_buffer_size,	    SHOW_SYS},
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  {sys_key_cache_age_threshold.name,   (char*) &sys_key_cache_age_threshold,
                                                                    SHOW_SYS},
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igor@rurik.mysql.com committed
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  {sys_key_cache_block_size.name,   (char*) &sys_key_cache_block_size,
827
                                                                    SHOW_SYS},
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  {sys_key_cache_division_limit.name,   (char*) &sys_key_cache_division_limit,
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                                                                    SHOW_SYS},
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  {"language",                language,                             SHOW_CHAR},
831
  {"large_files_support",     (char*) &opt_large_files,             SHOW_BOOL},
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  {"large_pages",             (char*) &opt_large_pages,             SHOW_MY_BOOL},
  {"large_page_size",         (char*) &opt_large_page_size,         SHOW_INT},
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  {sys_license.name,	      (char*) &sys_license,                 SHOW_SYS},
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  {sys_local_infile.name,     (char*) &sys_local_infile,	    SHOW_SYS},
#ifdef HAVE_MLOCKALL
  {"locked_in_memory",	      (char*) &locked_in_memory,	    SHOW_BOOL},
#endif
  {"log",                     (char*) &opt_log,                     SHOW_BOOL},
  {"log_bin",                 (char*) &opt_bin_log,                 SHOW_BOOL},
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  {"log_error",               (char*) log_error_file,               SHOW_CHAR},
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842
#ifdef HAVE_REPLICATION
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  {"log_slave_updates",       (char*) &opt_log_slave_updates,       SHOW_MY_BOOL},
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#endif
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  {"log_slow_queries",        (char*) &opt_slow_log,                SHOW_BOOL},
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  {"log_update",              (char*) &opt_update_log,              SHOW_BOOL},
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  {sys_log_warnings.name,     (char*) &sys_log_warnings,	    SHOW_SYS},
  {sys_long_query_time.name,  (char*) &sys_long_query_time, 	    SHOW_SYS},
  {sys_low_priority_updates.name, (char*) &sys_low_priority_updates, SHOW_SYS},
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  {"lower_case_file_system",  (char*) &lower_case_file_system,      SHOW_MY_BOOL},
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  {"lower_case_table_names",  (char*) &lower_case_table_names,      SHOW_INT},
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  {sys_max_allowed_packet.name,(char*) &sys_max_allowed_packet,	    SHOW_SYS},
  {sys_max_binlog_cache_size.name,(char*) &sys_max_binlog_cache_size, SHOW_SYS},
  {sys_max_binlog_size.name,    (char*) &sys_max_binlog_size,	    SHOW_SYS},
  {sys_max_connect_errors.name, (char*) &sys_max_connect_errors,    SHOW_SYS},
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  {sys_max_connections.name,    (char*) &sys_max_connections,	    SHOW_SYS},
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  {sys_max_delayed_threads.name,(char*) &sys_max_delayed_threads,   SHOW_SYS},
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  {sys_max_error_count.name,	(char*) &sys_max_error_count,	    SHOW_SYS},
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  {sys_max_heap_table_size.name,(char*) &sys_max_heap_table_size,   SHOW_SYS},
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  {sys_max_insert_delayed_threads.name,
   (char*) &sys_max_insert_delayed_threads,   SHOW_SYS},
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  {sys_max_join_size.name,	(char*) &sys_max_join_size,	    SHOW_SYS},
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  {sys_max_length_for_sort_data.name, (char*) &sys_max_length_for_sort_data,
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   SHOW_SYS},
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  {sys_max_relay_log_size.name, (char*) &sys_max_relay_log_size,    SHOW_SYS},
  {sys_max_seeks_for_key.name,  (char*) &sys_max_seeks_for_key,	    SHOW_SYS},
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  {sys_max_sort_length.name,	(char*) &sys_max_sort_length,	    SHOW_SYS},
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  {sys_max_tmp_tables.name,	(char*) &sys_max_tmp_tables,	    SHOW_SYS},
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  {sys_max_user_connections.name,(char*) &sys_max_user_connections, SHOW_SYS},
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  {sys_max_write_lock_count.name, (char*) &sys_max_write_lock_count,SHOW_SYS},
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871
  {sys_multi_range_count.name,  (char*) &sys_multi_range_count,     SHOW_SYS},
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serg@serg.mylan committed
872
  {sys_myisam_data_pointer_size.name, (char*) &sys_myisam_data_pointer_size, SHOW_SYS},
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  {sys_myisam_max_extra_sort_file_size.name,
   (char*) &sys_myisam_max_extra_sort_file_size,
   SHOW_SYS},
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  {sys_myisam_max_sort_file_size.name, (char*) &sys_myisam_max_sort_file_size,
   SHOW_SYS},
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  {"myisam_recover_options",  (char*) &myisam_recover_options_str,  SHOW_CHAR_PTR},
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  {sys_myisam_repair_threads.name, (char*) &sys_myisam_repair_threads,
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   SHOW_SYS},
  {sys_myisam_sort_buffer_size.name, (char*) &sys_myisam_sort_buffer_size, SHOW_SYS},
#ifdef __NT__
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  {"named_pipe",	      (char*) &opt_enable_named_pipe,       SHOW_MY_BOOL},
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#endif
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  {sys_engine_condition_pushdown.name, 
   (char*) &sys_engine_condition_pushdown,                          SHOW_SYS},
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#ifdef HAVE_NDBCLUSTER_DB
  {sys_ndb_autoincrement_prefetch_sz.name,
   (char*) &sys_ndb_autoincrement_prefetch_sz,                      SHOW_SYS},
  {sys_ndb_force_send.name,   (char*) &sys_ndb_force_send,          SHOW_SYS},
  {sys_ndb_use_exact_count.name,(char*) &sys_ndb_use_exact_count,   SHOW_SYS},
  {sys_ndb_use_transactions.name,(char*) &sys_ndb_use_transactions, SHOW_SYS},
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  {sys_ndb_cache_check_time.name,(char*) &sys_ndb_cache_check_time, SHOW_SYS},
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#endif
  {sys_net_buffer_length.name,(char*) &sys_net_buffer_length,       SHOW_SYS},
  {sys_net_read_timeout.name, (char*) &sys_net_read_timeout,        SHOW_SYS},
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  {sys_net_retry_count.name,  (char*) &sys_net_retry_count,	    SHOW_SYS},
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  {sys_net_write_timeout.name,(char*) &sys_net_write_timeout,       SHOW_SYS},
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  {sys_new_mode.name,         (char*) &sys_new_mode,                SHOW_SYS},
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  {sys_old_passwords.name,    (char*) &sys_old_passwords,           SHOW_SYS},
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  {"open_files_limit",	      (char*) &open_files_limit,	    SHOW_LONG},
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  {sys_optimizer_prune_level.name, (char*) &sys_optimizer_prune_level,
   SHOW_SYS},
  {sys_optimizer_search_depth.name,(char*) &sys_optimizer_search_depth,
   SHOW_SYS},
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  {"pid_file",                (char*) pidfile_name,                 SHOW_CHAR},
907
  {"port",                    (char*) &mysqld_port,                  SHOW_INT},
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  {sys_preload_buff_size.name, (char*) &sys_preload_buff_size,      SHOW_SYS},
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  {"protocol_version",        (char*) &protocol_version,            SHOW_INT},
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  {sys_query_alloc_block_size.name, (char*) &sys_query_alloc_block_size,
   SHOW_SYS},
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#ifdef HAVE_QUERY_CACHE
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  {sys_query_cache_limit.name,(char*) &sys_query_cache_limit,	    SHOW_SYS},
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  {sys_query_cache_min_res_unit.name, (char*) &sys_query_cache_min_res_unit,
   SHOW_SYS},
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  {sys_query_cache_size.name, (char*) &sys_query_cache_size,	    SHOW_SYS},
  {sys_query_cache_type.name, (char*) &sys_query_cache_type,        SHOW_SYS},
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paul@ice.snake.net committed
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  {sys_query_cache_wlock_invalidate.name,
   (char *) &sys_query_cache_wlock_invalidate, SHOW_SYS},
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#endif /* HAVE_QUERY_CACHE */
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  {sys_query_prealloc_size.name, (char*) &sys_query_prealloc_size,  SHOW_SYS},
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  {sys_range_alloc_block_size.name, (char*) &sys_range_alloc_block_size,
   SHOW_SYS},
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serg@serg.mylan committed
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  {sys_read_buff_size.name,   (char*) &sys_read_buff_size,	    SHOW_SYS},
  {sys_readonly.name,         (char*) &sys_readonly,                SHOW_SYS},
  {sys_read_rnd_buff_size.name,(char*) &sys_read_rnd_buff_size,	    SHOW_SYS},
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#ifdef HAVE_REPLICATION
  {sys_relay_log_purge.name,  (char*) &sys_relay_log_purge,         SHOW_SYS},
#endif
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  {sys_rpl_recovery_rank.name,(char*) &sys_rpl_recovery_rank,       SHOW_SYS},
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  {"secure_auth",             (char*) &sys_secure_auth,             SHOW_SYS},
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#ifdef HAVE_SMEM
  {"shared_memory",           (char*) &opt_enable_shared_memory,    SHOW_MY_BOOL},
  {"shared_memory_base_name", (char*) &shared_memory_base_name,     SHOW_CHAR_PTR},
#endif
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  {sys_server_id.name,	      (char*) &sys_server_id,		    SHOW_SYS},
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  {"skip_external_locking",   (char*) &my_disable_locking,          SHOW_MY_BOOL},
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  {"skip_networking",         (char*) &opt_disable_networking,      SHOW_BOOL},
  {"skip_show_database",      (char*) &opt_skip_show_db,            SHOW_BOOL},
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#ifdef HAVE_REPLICATION
  {sys_slave_net_timeout.name,(char*) &sys_slave_net_timeout,	    SHOW_SYS},
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  {sys_slave_trans_retries.name,(char*) &sys_slave_trans_retries,   SHOW_SYS},
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#endif
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  {sys_slow_launch_time.name, (char*) &sys_slow_launch_time,        SHOW_SYS},
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#ifdef HAVE_SYS_UN_H
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  {"socket",                  (char*) &mysqld_unix_port,             SHOW_CHAR_PTR},
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#endif
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  {sys_sort_buffer.name,      (char*) &sys_sort_buffer, 	    SHOW_SYS},
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  {sys_sql_mode.name,         (char*) &sys_sql_mode,                SHOW_SYS},
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  {sys_storage_engine.name,   (char*) &sys_storage_engine,          SHOW_SYS},
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  {"sql_notes",               (char*) &sys_sql_notes,               SHOW_BOOL},
  {"sql_warnings",            (char*) &sys_sql_warnings,            SHOW_BOOL},
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#ifdef HAVE_REPLICATION
  {sys_sync_binlog_period.name,(char*) &sys_sync_binlog_period,     SHOW_SYS},
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  {sys_sync_replication.name, (char*) &sys_sync_replication,        SHOW_SYS},
  {sys_sync_replication_slave_id.name, (char*) &sys_sync_replication_slave_id,SHOW_SYS},
  {sys_sync_replication_timeout.name, (char*) &sys_sync_replication_timeout,SHOW_SYS},
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#endif
  {sys_sync_frm.name,         (char*) &sys_sync_frm,               SHOW_SYS},
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#ifdef HAVE_TZNAME
  {"system_time_zone",        system_time_zone,                     SHOW_CHAR},
#endif
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  {"table_cache",             (char*) &table_cache_size,            SHOW_LONG},
  {sys_table_type.name,	      (char*) &sys_table_type,	            SHOW_SYS},
  {sys_thread_cache_size.name,(char*) &sys_thread_cache_size,       SHOW_SYS},
#ifdef HAVE_THR_SETCONCURRENCY
  {"thread_concurrency",      (char*) &concurrency,                 SHOW_LONG},
#endif
  {"thread_stack",            (char*) &thread_stack,                SHOW_LONG},
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  {sys_time_format.name,      (char*) &sys_time_format,		    SHOW_SYS},
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  {"time_zone",               (char*) &sys_time_zone,               SHOW_SYS},
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  {sys_timed_mutexes.name,    (char*) &sys_timed_mutexes,       SHOW_SYS},
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  {sys_tmp_table_size.name,   (char*) &sys_tmp_table_size,	    SHOW_SYS},
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  {"tmpdir",                  (char*) &opt_mysql_tmpdir,            SHOW_CHAR_PTR},
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  {sys_trans_alloc_block_size.name, (char*) &sys_trans_alloc_block_size,
   SHOW_SYS},
  {sys_trans_prealloc_size.name, (char*) &sys_trans_prealloc_size,  SHOW_SYS},
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  {sys_tx_isolation.name,     (char*) &sys_tx_isolation,	    SHOW_SYS},
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  {sys_updatable_views_with_limit.name,
                              (char*) &sys_updatable_views_with_limit,SHOW_SYS},
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  {"version",                 server_version,                       SHOW_CHAR},
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#ifdef HAVE_BERKELEY_DB
  {"version_bdb",             (char*) DB_VERSION_STRING,            SHOW_CHAR},
#endif
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  {"version_comment",         (char*) MYSQL_COMPILATION_COMMENT,    SHOW_CHAR},
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  {"version_compile_machine", (char*) MACHINE_TYPE,		    SHOW_CHAR},
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  {sys_os.name,		      (char*) &sys_os,			    SHOW_SYS},
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  {sys_net_wait_timeout.name, (char*) &sys_net_wait_timeout,	    SHOW_SYS},
  {NullS, NullS, SHOW_LONG}
};

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bool sys_var::check(THD *thd, set_var *var)
{
  var->save_result.ulonglong_value= var->value->val_int();
  return 0;
}

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bool sys_var_str::check(THD *thd, set_var *var)
{
  int res;
  if (!check_func)
    return 0;

  if ((res=(*check_func)(thd, var)) < 0)
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    my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0),
             name, var->value->str_value.ptr());
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  return res;
}

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/*
  Functions to check and update variables
*/

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/*
  Update variables 'init_connect, init_slave'.

  In case of 'DEFAULT' value
  (for example: 'set GLOBAL init_connect=DEFAULT')
  'var' parameter is NULL pointer.
*/

bool update_sys_var_str(sys_var_str *var_str, rw_lock_t *var_mutex,
			set_var *var)
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{
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  char *res= 0, *old_value=(char *)(var ? var->value->str_value.ptr() : 0);
  uint new_length= (var ? var->value->str_value.length() : 0);
  if (!old_value)
    old_value= (char*) "";
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  if (!(res= my_strdup_with_length((byte*)old_value, new_length, MYF(0))))
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    return 1;
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  /*
    Replace the old value in such a way that the any thread using
    the value will work.
  */
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  rw_wrlock(var_mutex);
  old_value= var_str->value;
  var_str->value= res;
  var_str->value_length= new_length;
  rw_unlock(var_mutex);
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  my_free(old_value, MYF(MY_ALLOW_ZERO_PTR));
  return 0;
}


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static bool sys_update_init_connect(THD *thd, set_var *var)
{
  return update_sys_var_str(&sys_init_connect, &LOCK_sys_init_connect, var);
}


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static void sys_default_init_connect(THD* thd, enum_var_type type)
{
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  update_sys_var_str(&sys_init_connect, &LOCK_sys_init_connect, 0);
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}


static bool sys_update_init_slave(THD *thd, set_var *var)
{
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  return update_sys_var_str(&sys_init_slave, &LOCK_sys_init_slave, var);
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}


static void sys_default_init_slave(THD* thd, enum_var_type type)
{
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  update_sys_var_str(&sys_init_slave, &LOCK_sys_init_slave, 0);
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}

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static int sys_check_ftb_syntax(THD *thd,  set_var *var)
{
  if (thd->master_access & SUPER_ACL)
    return ft_boolean_check_syntax_string((byte*) var->value->str_value.c_ptr()) ?
      -1 : 0;
  else
  {
    my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), "SUPER");
    return 1;
  }
}

static bool sys_update_ftb_syntax(THD *thd, set_var * var)
{
  strmake(ft_boolean_syntax, var->value->str_value.c_ptr(),
	  sizeof(ft_boolean_syntax)-1);
  return 0;
}

static void sys_default_ftb_syntax(THD *thd, enum_var_type type)
{
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  strmake(ft_boolean_syntax, def_ft_boolean_syntax,
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	  sizeof(ft_boolean_syntax)-1);
}
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/*
  The following 3 functions need to be changed in 4.1 when we allow
  one to change character sets
*/

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static int sys_check_charset(THD *thd, set_var *var)
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{
  return 0;
}


static bool sys_update_charset(THD *thd, set_var *var)
{
  return 0;
}


static void sys_set_default_charset(THD *thd, enum_var_type type)
{
}


/*
  If one sets the LOW_PRIORIY UPDATES flag, we also must change the
  used lock type
*/

static void fix_low_priority_updates(THD *thd, enum_var_type type)
{
  if (type != OPT_GLOBAL)
    thd->update_lock_default= (thd->variables.low_priority_updates ?
			       TL_WRITE_LOW_PRIORITY : TL_WRITE);
}


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static void
fix_myisam_max_extra_sort_file_size(THD *thd, enum_var_type type)
{
  myisam_max_extra_temp_length=
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    (my_off_t) global_system_variables.myisam_max_extra_sort_file_size;
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}


static void
fix_myisam_max_sort_file_size(THD *thd, enum_var_type type)
{
  myisam_max_temp_length=
    (my_off_t) global_system_variables.myisam_max_sort_file_size;
}

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/*
  Set the OPTION_BIG_SELECTS flag if max_join_size == HA_POS_ERROR
*/

static void fix_max_join_size(THD *thd, enum_var_type type)
{
  if (type != OPT_GLOBAL)
  {
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    if (thd->variables.max_join_size == HA_POS_ERROR)
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      thd->options|= OPTION_BIG_SELECTS;
    else
      thd->options&= ~OPTION_BIG_SELECTS;
  }
}
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/*
  If one doesn't use the SESSION modifier, the isolation level
  is only active for the next command
*/

static void fix_tx_isolation(THD *thd, enum_var_type type)
{
  if (type == OPT_SESSION)
    thd->session_tx_isolation= ((enum_tx_isolation)
				thd->variables.tx_isolation);
}

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static void fix_completion_type(THD *thd __attribute__(unused), 
				enum_var_type type __attribute__(unused)) {}

static int check_completion_type(THD *thd, set_var *var)
{
  longlong val= var->value->val_int();
  if (val < 0 || val > 2)
  {
    char buf[64];
    my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), var->var->name, llstr(val, buf));
    return 1;
  }
  return 0;
}

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/*
  If we are changing the thread variable, we have to copy it to NET too
*/

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#ifdef HAVE_REPLICATION
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static void fix_net_read_timeout(THD *thd, enum_var_type type)
{
  if (type != OPT_GLOBAL)
    thd->net.read_timeout=thd->variables.net_read_timeout;
}


static void fix_net_write_timeout(THD *thd, enum_var_type type)
{
  if (type != OPT_GLOBAL)
    thd->net.write_timeout=thd->variables.net_write_timeout;
}

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static void fix_net_retry_count(THD *thd, enum_var_type type)
{
  if (type != OPT_GLOBAL)
    thd->net.retry_count=thd->variables.net_retry_count;
}
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#else /* HAVE_REPLICATION */
static void fix_net_read_timeout(THD *thd __attribute__(unused),
				 enum_var_type type __attribute__(unused))
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{}
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static void fix_net_write_timeout(THD *thd __attribute__(unused),
				  enum_var_type type __attribute__(unused))
1218
{}
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static void fix_net_retry_count(THD *thd __attribute__(unused),
				enum_var_type type __attribute__(unused))
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{}
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#endif /* HAVE_REPLICATION */
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static void fix_query_cache_size(THD *thd, enum_var_type type)
{
#ifdef HAVE_QUERY_CACHE
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  ulong requested= query_cache_size;
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  query_cache.resize(query_cache_size);
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  if (requested != query_cache_size)
    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
			ER_WARN_QC_RESIZE, ER(ER_WARN_QC_RESIZE),
			requested, query_cache_size);
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#endif
}


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#ifdef HAVE_QUERY_CACHE
static void fix_query_cache_min_res_unit(THD *thd, enum_var_type type)
{
  query_cache_min_res_unit= 
    query_cache.set_min_res_unit(query_cache_min_res_unit);
}
#endif


1247
extern void fix_delay_key_write(THD *thd, enum_var_type type)
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{
  switch ((enum_delay_key_write) delay_key_write_options) {
  case DELAY_KEY_WRITE_NONE:
    myisam_delay_key_write=0;
    break;
  case DELAY_KEY_WRITE_ON:
    myisam_delay_key_write=1;
    break;
  case DELAY_KEY_WRITE_ALL:
    myisam_delay_key_write=1;
    ha_open_options|= HA_OPEN_DELAY_KEY_WRITE;
    break;
  }
}

1263
static void fix_max_binlog_size(THD *thd, enum_var_type type)
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{
  DBUG_ENTER("fix_max_binlog_size");
  DBUG_PRINT("info",("max_binlog_size=%lu max_relay_log_size=%lu",
                     max_binlog_size, max_relay_log_size));
  mysql_bin_log.set_max_size(max_binlog_size);
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#ifdef HAVE_REPLICATION
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  if (!max_relay_log_size)
    active_mi->rli.relay_log.set_max_size(max_binlog_size);
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#endif
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  DBUG_VOID_RETURN;
}

1276
static void fix_max_relay_log_size(THD *thd, enum_var_type type)
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{
  DBUG_ENTER("fix_max_relay_log_size");
  DBUG_PRINT("info",("max_binlog_size=%lu max_relay_log_size=%lu",
                     max_binlog_size, max_relay_log_size));
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#ifdef HAVE_REPLICATION
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  active_mi->rli.relay_log.set_max_size(max_relay_log_size ?
                                        max_relay_log_size: max_binlog_size);
1284
#endif
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  DBUG_VOID_RETURN;
}
1287

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static int check_max_delayed_threads(THD *thd, set_var *var)
{
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  longlong val= var->value->val_int();
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  if (var->type != OPT_GLOBAL && val != 0 &&
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      val != (longlong) global_system_variables.max_insert_delayed_threads)
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  {
    char buf[64];
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    my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), var->var->name, llstr(val, buf));
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    return 1;
  }
  return 0;
}

1302
static void fix_max_connections(THD *thd, enum_var_type type)
1303
{
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#ifndef EMBEDDED_LIBRARY
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  resize_thr_alarm(max_connections + 
		   global_system_variables.max_insert_delayed_threads + 10);
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#endif
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}


static void fix_thd_mem_root(THD *thd, enum_var_type type)
{
  if (type != OPT_GLOBAL)
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    reset_root_defaults(thd->mem_root,
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                        thd->variables.query_alloc_block_size,
                        thd->variables.query_prealloc_size);
}


static void fix_trans_mem_root(THD *thd, enum_var_type type)
{
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#ifdef USING_TRANSACTIONS
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  if (type != OPT_GLOBAL)
    reset_root_defaults(&thd->transaction.mem_root,
                        thd->variables.trans_alloc_block_size,
                        thd->variables.trans_prealloc_size);
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#endif
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}

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static void fix_server_id(THD *thd, enum_var_type type)
{
  server_id_supplied = 1;
}
1335

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bool sys_var_long_ptr::check(THD *thd, set_var *var)
{
  longlong v= var->value->val_int();
  var->save_result.ulonglong_value= v < 0 ? 0 : v;
  return 0;
}
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bool sys_var_long_ptr::update(THD *thd, set_var *var)
{
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  ulonglong tmp= var->save_result.ulonglong_value;
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  pthread_mutex_lock(&LOCK_global_system_variables);
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  if (option_limits)
    *value= (ulong) getopt_ull_limit_value(tmp, option_limits);
  else
    *value= (ulong) tmp;
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  pthread_mutex_unlock(&LOCK_global_system_variables);
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  return 0;
}


void sys_var_long_ptr::set_default(THD *thd, enum_var_type type)
{
  *value= (ulong) option_limits->def_value;
}


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bool sys_var_ulonglong_ptr::update(THD *thd, set_var *var)
{
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  ulonglong tmp= var->save_result.ulonglong_value;
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  pthread_mutex_lock(&LOCK_global_system_variables);
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  if (option_limits)
    *value= (ulonglong) getopt_ull_limit_value(tmp, option_limits);
  else
    *value= (ulonglong) tmp;
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  pthread_mutex_unlock(&LOCK_global_system_variables);
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  return 0;
}


void sys_var_ulonglong_ptr::set_default(THD *thd, enum_var_type type)
{
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  pthread_mutex_lock(&LOCK_global_system_variables);
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  *value= (ulonglong) option_limits->def_value;
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  pthread_mutex_unlock(&LOCK_global_system_variables);
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}


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bool sys_var_bool_ptr::update(THD *thd, set_var *var)
{
  *value= (my_bool) var->save_result.ulong_value;
  return 0;
}


void sys_var_bool_ptr::set_default(THD *thd, enum_var_type type)
{
  *value= (my_bool) option_limits->def_value;
}


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bool sys_var_enum::update(THD *thd, set_var *var)
{
  *value= (uint) var->save_result.ulong_value;
  return 0;
}


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byte *sys_var_enum::value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
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{
  return (byte*) enum_names->type_names[*value];
}

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bool sys_var_thd_ulong::check(THD *thd, set_var *var)
{
  return (sys_var_thd::check(thd, var) ||
          (check_func && (*check_func)(thd, var)));
}
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bool sys_var_thd_ulong::update(THD *thd, set_var *var)
{
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  ulonglong tmp= var->save_result.ulonglong_value;
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  /* Don't use bigger value than given with --maximum-variable-name=.. */
  if ((ulong) tmp > max_system_variables.*offset)
    tmp= max_system_variables.*offset;

  if (option_limits)
    tmp= (ulong) getopt_ull_limit_value(tmp, option_limits);
  if (var->type == OPT_GLOBAL)
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    global_system_variables.*offset= (ulong) tmp;
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  else
    thd->variables.*offset= (ulong) tmp;
  return 0;
}


void sys_var_thd_ulong::set_default(THD *thd, enum_var_type type)
{
  if (type == OPT_GLOBAL)
  {
    /* We will not come here if option_limits is not set */
    global_system_variables.*offset= (ulong) option_limits->def_value;
  }
  else
    thd->variables.*offset= global_system_variables.*offset;
}


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byte *sys_var_thd_ulong::value_ptr(THD *thd, enum_var_type type,
				   LEX_STRING *base)
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{
  if (type == OPT_GLOBAL)
    return (byte*) &(global_system_variables.*offset);
  return (byte*) &(thd->variables.*offset);
}


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bool sys_var_thd_ha_rows::update(THD *thd, set_var *var)
{
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  ulonglong tmp= var->save_result.ulonglong_value;
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  /* Don't use bigger value than given with --maximum-variable-name=.. */
  if ((ha_rows) tmp > max_system_variables.*offset)
    tmp= max_system_variables.*offset;

  if (option_limits)
    tmp= (ha_rows) getopt_ull_limit_value(tmp, option_limits);
  if (var->type == OPT_GLOBAL)
  {
    /* Lock is needed to make things safe on 32 bit systems */
    pthread_mutex_lock(&LOCK_global_system_variables);    
    global_system_variables.*offset= (ha_rows) tmp;
    pthread_mutex_unlock(&LOCK_global_system_variables);
  }
  else
    thd->variables.*offset= (ha_rows) tmp;
  return 0;
}


void sys_var_thd_ha_rows::set_default(THD *thd, enum_var_type type)
{
  if (type == OPT_GLOBAL)
  {
    /* We will not come here if option_limits is not set */
    pthread_mutex_lock(&LOCK_global_system_variables);
    global_system_variables.*offset= (ha_rows) option_limits->def_value;
    pthread_mutex_unlock(&LOCK_global_system_variables);
  }
  else
    thd->variables.*offset= global_system_variables.*offset;
}


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byte *sys_var_thd_ha_rows::value_ptr(THD *thd, enum_var_type type,
				     LEX_STRING *base)
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{
  if (type == OPT_GLOBAL)
    return (byte*) &(global_system_variables.*offset);
  return (byte*) &(thd->variables.*offset);
}

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bool sys_var_thd_ulonglong::update(THD *thd,  set_var *var)
{
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  ulonglong tmp= var->save_result.ulonglong_value;
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1502
  if (tmp > max_system_variables.*offset)
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    tmp= max_system_variables.*offset;

  if (option_limits)
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    tmp= getopt_ull_limit_value(tmp, option_limits);
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  if (var->type == OPT_GLOBAL)
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  {
    /* Lock is needed to make things safe on 32 bit systems */
    pthread_mutex_lock(&LOCK_global_system_variables);
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    global_system_variables.*offset= (ulonglong) tmp;
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    pthread_mutex_unlock(&LOCK_global_system_variables);
  }
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  else
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    thd->variables.*offset= (ulonglong) tmp;
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  return 0;
}


void sys_var_thd_ulonglong::set_default(THD *thd, enum_var_type type)
{
  if (type == OPT_GLOBAL)
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  {
    pthread_mutex_lock(&LOCK_global_system_variables);
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    global_system_variables.*offset= (ulonglong) option_limits->def_value;
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    pthread_mutex_unlock(&LOCK_global_system_variables);
  }
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  else
    thd->variables.*offset= global_system_variables.*offset;
}


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byte *sys_var_thd_ulonglong::value_ptr(THD *thd, enum_var_type type,
				       LEX_STRING *base)
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{
  if (type == OPT_GLOBAL)
    return (byte*) &(global_system_variables.*offset);
  return (byte*) &(thd->variables.*offset);
}


bool sys_var_thd_bool::update(THD *thd,  set_var *var)
{
  if (var->type == OPT_GLOBAL)
    global_system_variables.*offset= (my_bool) var->save_result.ulong_value;
  else
    thd->variables.*offset= (my_bool) var->save_result.ulong_value;
  return 0;
}


void sys_var_thd_bool::set_default(THD *thd,  enum_var_type type)
{
  if (type == OPT_GLOBAL)
    global_system_variables.*offset= (my_bool) option_limits->def_value;
  else
    thd->variables.*offset= global_system_variables.*offset;
}


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byte *sys_var_thd_bool::value_ptr(THD *thd, enum_var_type type,
				  LEX_STRING *base)
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{
  if (type == OPT_GLOBAL)
    return (byte*) &(global_system_variables.*offset);
  return (byte*) &(thd->variables.*offset);
}


bool sys_var::check_enum(THD *thd, set_var *var, TYPELIB *enum_names)
{
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  char buff[STRING_BUFFER_USUAL_SIZE];
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  const char *value;
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  String str(buff, sizeof(buff), system_charset_info), *res;
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  if (var->value->result_type() == STRING_RESULT)
  {
    if (!(res=var->value->val_str(&str)) ||
	((long) (var->save_result.ulong_value=
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		 (ulong) find_type(enum_names, res->ptr(),
				   res->length(),1)-1)) < 0)
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    {
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      value= res ? res->c_ptr() : "NULL";
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      goto err;
    }
  }
  else
  {
    ulonglong tmp=var->value->val_int();
    if (tmp >= enum_names->count)
    {
      llstr(tmp,buff);
      value=buff;				// Wrong value is here
      goto err;
    }
    var->save_result.ulong_value= (ulong) tmp;	// Save for update
  }
  return 0;

err:
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  my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), name, value);
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  return 1;
}

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bool sys_var::check_set(THD *thd, set_var *var, TYPELIB *enum_names)
{
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  bool not_used;
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  char buff[STRING_BUFFER_USUAL_SIZE], *error= 0;
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  uint error_len= 0;
  String str(buff, sizeof(buff), system_charset_info), *res;

  if (var->value->result_type() == STRING_RESULT)
  {
    if (!(res= var->value->val_str(&str)))
      goto err;
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    var->save_result.ulong_value= ((ulong)
				   find_set(enum_names, res->c_ptr(),
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					    res->length(),
                                            NULL,
                                            &error, &error_len,
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					    &not_used));
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    if (error_len)
    {
      strmake(buff, error, min(sizeof(buff), error_len));
      goto err;
    }
  }
  else
  {
    ulonglong tmp= var->value->val_int();
    if (tmp >= enum_names->count)
    {
      llstr(tmp, buff);
      goto err;
    }
    var->save_result.ulong_value= (ulong) tmp;  // Save for update
  }
  return 0;

err:
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  my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), name, buff);
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  return 1;
}


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/*
  Return an Item for a variable.  Used with @@[global.]variable_name

  If type is not given, return local value if exists, else global

  We have to use netprintf() instead of my_error() here as this is
  called on the parsing stage.
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  TODO:
    With prepared statements/stored procedures this has to be fixed
    to create an item that gets the current value at fix_fields() stage.
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*/

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Item *sys_var::item(THD *thd, enum_var_type var_type, LEX_STRING *base)
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{
  if (check_type(var_type))
  {
    if (var_type != OPT_DEFAULT)
    {
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      my_error(ER_INCORRECT_GLOBAL_LOCAL_VAR, MYF(0),
               name, var_type == OPT_GLOBAL ? "SESSION" : "GLOBAL");
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      return 0;
    }
    /* As there was no local variable, return the global value */
    var_type= OPT_GLOBAL;
  }
  switch (type()) {
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  case SHOW_INT:
  {
    uint value;
    pthread_mutex_lock(&LOCK_global_system_variables);
    value= *(uint*) value_ptr(thd, var_type, base);
    pthread_mutex_unlock(&LOCK_global_system_variables);
    return new Item_uint((int32) value);
  }
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  case SHOW_LONG:
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  {
    ulong value;
    pthread_mutex_lock(&LOCK_global_system_variables);
    value= *(ulong*) value_ptr(thd, var_type, base);
    pthread_mutex_unlock(&LOCK_global_system_variables);
    return new Item_uint((int32) value);
  }
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  case SHOW_LONGLONG:
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  {
    longlong value;
    pthread_mutex_lock(&LOCK_global_system_variables);
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    value= *(longlong*) value_ptr(thd, var_type, base);
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    pthread_mutex_unlock(&LOCK_global_system_variables);
    return new Item_int(value);
  }
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  case SHOW_HA_ROWS:
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  {
    ha_rows value;
    pthread_mutex_lock(&LOCK_global_system_variables);
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    value= *(ha_rows*) value_ptr(thd, var_type, base);
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    pthread_mutex_unlock(&LOCK_global_system_variables);
    return new Item_int((longlong) value);
  }
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  case SHOW_MY_BOOL:
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    return new Item_int((int32) *(my_bool*) value_ptr(thd, var_type, base),1);
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  case SHOW_CHAR:
  {
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    Item_string *tmp;
    pthread_mutex_lock(&LOCK_global_system_variables);
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    char *str= (char*) value_ptr(thd, var_type, base);
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    tmp= new Item_string(str, strlen(str), system_charset_info);
    pthread_mutex_unlock(&LOCK_global_system_variables);
    return tmp;
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  }
  default:
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    my_error(ER_VAR_CANT_BE_READ, MYF(0), name);
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  }
  return 0;
}


bool sys_var_thd_enum::update(THD *thd, set_var *var)
{
  if (var->type == OPT_GLOBAL)
    global_system_variables.*offset= var->save_result.ulong_value;
  else
    thd->variables.*offset= var->save_result.ulong_value;
  return 0;
}


void sys_var_thd_enum::set_default(THD *thd, enum_var_type type)
{
  if (type == OPT_GLOBAL)
    global_system_variables.*offset= (ulong) option_limits->def_value;
  else
    thd->variables.*offset= global_system_variables.*offset;
}


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byte *sys_var_thd_enum::value_ptr(THD *thd, enum_var_type type,
				  LEX_STRING *base)
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{
  ulong tmp= ((type == OPT_GLOBAL) ?
	      global_system_variables.*offset :
	      thd->variables.*offset);
  return (byte*) enum_names->type_names[tmp];
}

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bool sys_var_thd_bit::check(THD *thd, set_var *var)
{
  return (check_enum(thd, var, &bool_typelib) ||
          (check_func && (*check_func)(thd, var)));
}
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bool sys_var_thd_bit::update(THD *thd, set_var *var)
{
1760
  int res= (*update_func)(thd, var);
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  return res;
}


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byte *sys_var_thd_bit::value_ptr(THD *thd, enum_var_type type,
				 LEX_STRING *base)
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{
  /*
    If reverse is 0 (default) return 1 if bit is set.
    If reverse is 1, return 0 if bit is set
  */
  thd->sys_var_tmp.my_bool_value= ((thd->options & bit_flag) ?
				   !reverse : reverse);
  return (byte*) &thd->sys_var_tmp.my_bool_value;
}


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/* Update a date_time format variable based on given value */

void sys_var_thd_date_time_format::update2(THD *thd, enum_var_type type,
					   DATE_TIME_FORMAT *new_value)
{
  DATE_TIME_FORMAT *old;
  DBUG_ENTER("sys_var_date_time_format::update2");
  DBUG_DUMP("positions",(char*) new_value->positions,
	    sizeof(new_value->positions));

  if (type == OPT_GLOBAL)
  {
    pthread_mutex_lock(&LOCK_global_system_variables);
    old= (global_system_variables.*offset);
    (global_system_variables.*offset)= new_value;
    pthread_mutex_unlock(&LOCK_global_system_variables);
  }
  else
  {
    old= (thd->variables.*offset);
    (thd->variables.*offset)= new_value;
  }
  my_free((char*) old, MYF(MY_ALLOW_ZERO_PTR));
  DBUG_VOID_RETURN;
}


bool sys_var_thd_date_time_format::update(THD *thd, set_var *var)
{
  DATE_TIME_FORMAT *new_value;
  /* We must make a copy of the last value to get it into normal memory */
  new_value= date_time_format_copy((THD*) 0,
				   var->save_result.date_time_format);
  if (!new_value)
    return 1;					// Out of memory
  update2(thd, var->type, new_value);		// Can't fail
  return 0;
}


bool sys_var_thd_date_time_format::check(THD *thd, set_var *var)
{
1820
  char buff[STRING_BUFFER_USUAL_SIZE];
1821 1822 1823 1824 1825 1826 1827 1828 1829
  String str(buff,sizeof(buff), system_charset_info), *res;
  DATE_TIME_FORMAT *format;

  if (!(res=var->value->val_str(&str)))
    res= &my_empty_string;

  if (!(format= date_time_format_make(date_time_type,
				      res->ptr(), res->length())))
  {
1830
    my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), name, res->c_ptr());
1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883
    return 1;
  }
  
  /*
    We must copy result to thread space to not get a memory leak if
    update is aborted
  */
  var->save_result.date_time_format= date_time_format_copy(thd, format);
  my_free((char*) format, MYF(0));
  return var->save_result.date_time_format == 0;
}


void sys_var_thd_date_time_format::set_default(THD *thd, enum_var_type type)
{
  DATE_TIME_FORMAT *res= 0;

  if (type == OPT_GLOBAL)
  {
    const char *format;
    if ((format= opt_date_time_formats[date_time_type]))
      res= date_time_format_make(date_time_type, format, strlen(format));
  }
  else
  {
    /* Make copy with malloc */
    res= date_time_format_copy((THD *) 0, global_system_variables.*offset);
  }

  if (res)					// Should always be true
    update2(thd, type, res);
}


byte *sys_var_thd_date_time_format::value_ptr(THD *thd, enum_var_type type,
					      LEX_STRING *base)
{
  if (type == OPT_GLOBAL)
  {
    char *res;
    /*
      We do a copy here just to be sure things will work even if someone
      is modifying the original string while the copy is accessed
      (Can't happen now in SQL SHOW, but this is a good safety for the future)
    */
    res= thd->strmake((global_system_variables.*offset)->format.str,
		      (global_system_variables.*offset)->format.length);
    return (byte*) res;
  }
  return (byte*) (thd->variables.*offset)->format.str;
}


1884 1885
typedef struct old_names_map_st
{
1886 1887 1888
  const char *old_name;
  const char *new_name;
} my_old_conv;
1889

1890 1891
static my_old_conv old_conv[]= 
{
1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902
  {	"cp1251_koi8"		,	"cp1251"	},
  {	"cp1250_latin2"		,	"cp1250"	},
  {	"kam_latin2"		,	"keybcs2"	},
  {	"mac_latin2"		,	"MacRoman"	},
  {	"macce_latin2"		,	"MacCE"		},
  {	"pc2_latin2"		,	"pclatin2"	},
  {	"vga_latin2"		,	"pclatin1"	},
  {	"koi8_cp1251"		,	"koi8r"		},
  {	"win1251ukr_koi8_ukr"	,	"win1251ukr"	},
  {	"koi8_ukr_win1251ukr"	,	"koi8u"		},
  {	NULL			,	NULL		}
1903
};
1904

1905
CHARSET_INFO *get_old_charset_by_name(const char *name)
1906
{
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1907
  my_old_conv *conv;
1908
 
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1909
  for (conv= old_conv; conv->old_name; conv++)
1910
  {
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1911 1912
    if (!my_strcasecmp(&my_charset_latin1, name, conv->old_name))
      return get_charset_by_csname(conv->new_name, MY_CS_PRIMARY, MYF(0));
1913
  }
1914
  return NULL;
1915 1916
}

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1917

1918
bool sys_var_collation::check(THD *thd, set_var *var)
1919 1920 1921
{
  CHARSET_INFO *tmp;

1922
  if (var->value->result_type() == STRING_RESULT)
1923
  {
1924
    char buff[STRING_BUFFER_USUAL_SIZE];
1925 1926 1927
    String str(buff,sizeof(buff), system_charset_info), *res;
    if (!(res=var->value->val_str(&str)))
    {
1928
      my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), name, "NULL");
1929 1930 1931 1932
      return 1;
    }
    if (!(tmp=get_charset_by_name(res->c_ptr(),MYF(0))))
    {
1933
      my_error(ER_UNKNOWN_COLLATION, MYF(0), res->c_ptr());
1934 1935
      return 1;
    }
1936
  }
1937
  else // INT_RESULT
1938
  {
1939
    if (!(tmp=get_charset((int) var->value->val_int(),MYF(0))))
1940 1941
    {
      char buf[20];
1942
      int10_to_str((int) var->value->val_int(), buf, -10);
1943
      my_error(ER_UNKNOWN_COLLATION, MYF(0), buf);
1944 1945
      return 1;
    }
1946 1947 1948 1949 1950
  }
  var->save_result.charset= tmp;	// Save for update
  return 0;
}

1951

1952 1953 1954 1955
bool sys_var_character_set::check(THD *thd, set_var *var)
{
  CHARSET_INFO *tmp;

1956 1957
  if (var->value->result_type() == STRING_RESULT)
  {
1958
    char buff[STRING_BUFFER_USUAL_SIZE];
1959 1960
    String str(buff,sizeof(buff), system_charset_info), *res;
    if (!(res=var->value->val_str(&str)))
1961
    {
1962 1963
      if (!nullable)
      {
1964
        my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), name, "NULL");
1965 1966 1967 1968 1969 1970 1971
        return 1;
      }
      tmp= NULL;
    }
    else if (!(tmp=get_charset_by_csname(res->c_ptr(),MY_CS_PRIMARY,MYF(0))) &&
             !(tmp=get_old_charset_by_name(res->c_ptr())))
    {
1972
      my_error(ER_UNKNOWN_CHARACTER_SET, MYF(0), res->c_ptr());
1973 1974 1975
      return 1;
    }
  }
1976
  else // INT_RESULT
1977
  {
1978
    if (!(tmp=get_charset((int) var->value->val_int(),MYF(0))))
1979 1980
    {
      char buf[20];
1981
      int10_to_str((int) var->value->val_int(), buf, -10);
1982 1983 1984
      my_error(ER_UNKNOWN_CHARACTER_SET, MYF(0), buf);
      return 1;
    }
1985 1986 1987 1988 1989
  }
  var->save_result.charset= tmp;	// Save for update
  return 0;
}

1990

1991
bool sys_var_character_set::update(THD *thd, set_var *var)
1992
{
1993
  ci_ptr(thd,var->type)[0]= var->save_result.charset;
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1994
  thd->update_charset();
1995 1996 1997
  return 0;
}

1998 1999 2000

byte *sys_var_character_set::value_ptr(THD *thd, enum_var_type type,
				       LEX_STRING *base)
2001
{
2002
  CHARSET_INFO *cs= ci_ptr(thd,type)[0];
2003
  return cs ? (byte*) cs->csname : (byte*) "NULL";
2004 2005
}

2006

2007 2008
CHARSET_INFO ** sys_var_character_set_connection::ci_ptr(THD *thd,
							 enum_var_type type)
2009 2010 2011 2012 2013 2014 2015
{
  if (type == OPT_GLOBAL)
    return &global_system_variables.collation_connection;
  else
    return &thd->variables.collation_connection;
}

2016 2017 2018

void sys_var_character_set_connection::set_default(THD *thd,
						   enum_var_type type)
2019 2020 2021 2022
{
 if (type == OPT_GLOBAL)
   global_system_variables.collation_connection= default_charset_info;
 else
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2023
 {
2024
   thd->variables.collation_connection= global_system_variables.collation_connection;
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2025 2026
   thd->update_charset();
 }
2027 2028
}

2029

2030 2031
CHARSET_INFO ** sys_var_character_set_client::ci_ptr(THD *thd,
						     enum_var_type type)
2032 2033 2034 2035 2036 2037 2038
{
  if (type == OPT_GLOBAL)
    return &global_system_variables.character_set_client;
  else
    return &thd->variables.character_set_client;
}

2039

2040
void sys_var_character_set_client::set_default(THD *thd, enum_var_type type)
2041 2042
{
 if (type == OPT_GLOBAL)
2043
   global_system_variables.character_set_client= default_charset_info;
2044
 else
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2045 2046 2047 2048 2049
 {
   thd->variables.character_set_client= (global_system_variables.
					 character_set_client);
   thd->update_charset();
 }
2050
}
2051

2052

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2053 2054
CHARSET_INFO **
sys_var_character_set_results::ci_ptr(THD *thd, enum_var_type type)
2055
{
2056 2057
  if (type == OPT_GLOBAL)
    return &global_system_variables.character_set_results;
2058
  else
2059
    return &thd->variables.character_set_results;
2060 2061
}

2062

2063
void sys_var_character_set_results::set_default(THD *thd, enum_var_type type)
2064
{
2065
 if (type == OPT_GLOBAL)
2066
   global_system_variables.character_set_results= default_charset_info;
2067
 else
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2068 2069 2070 2071 2072
 {
   thd->variables.character_set_results= (global_system_variables.
					  character_set_results);
   thd->update_charset();
 }
2073 2074
}

2075

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2076 2077
CHARSET_INFO **
sys_var_character_set_server::ci_ptr(THD *thd, enum_var_type type)
2078 2079
{
  if (type == OPT_GLOBAL)
2080
    return &global_system_variables.collation_server;
2081
  else
2082
    return &thd->variables.collation_server;
2083 2084
}

2085

2086
void sys_var_character_set_server::set_default(THD *thd, enum_var_type type)
2087 2088
{
 if (type == OPT_GLOBAL)
2089
   global_system_variables.collation_server= default_charset_info;
2090
 else
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2091
 {
2092
   thd->variables.collation_server= global_system_variables.collation_server;
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2093 2094
   thd->update_charset();
 }
2095 2096
}

2097
#if defined(HAVE_REPLICATION) && (MYSQL_VERSION_ID < 50003)
2098 2099
bool sys_var_character_set_server::check(THD *thd, set_var *var)
{
2100 2101 2102 2103 2104 2105
  /*
    To be perfect we should fail even if we are a 5.0.3 slave, a 4.1 master,
    and user wants to change our global character set variables. Because
    replicating a 4.1 assumes those are not changed. But that's not easy to
    do.
  */
2106 2107 2108 2109
  if ((var->type == OPT_GLOBAL) &&
      (mysql_bin_log.is_open() ||
       active_mi->slave_running || active_mi->rli.slave_running))
  {
2110
    my_error(ER_LOGGING_PROHIBIT_CHANGING_OF, MYF(0),
2111
	     "character set, collation");
2112 2113 2114 2115 2116
    return 1;
  }
  return sys_var_character_set::check(thd,var);
}
#endif
2117 2118 2119

CHARSET_INFO ** sys_var_character_set_database::ci_ptr(THD *thd,
						       enum_var_type type)
2120 2121
{
  if (type == OPT_GLOBAL)
2122
    return &global_system_variables.collation_database;
2123
  else
2124
    return &thd->variables.collation_database;
2125 2126
}

2127

2128 2129 2130
void sys_var_character_set_database::set_default(THD *thd, enum_var_type type)
{
 if (type == OPT_GLOBAL)
2131
    global_system_variables.collation_database= default_charset_info;
2132
  else
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2133
  {
2134
    thd->variables.collation_database= thd->db_charset;
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2135 2136
    thd->update_charset();
  }
2137 2138
}

2139

2140
bool sys_var_collation_connection::update(THD *thd, set_var *var)
2141 2142
{
  if (var->type == OPT_GLOBAL)
2143
    global_system_variables.collation_connection= var->save_result.charset;
2144
  else
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2145
  {
2146
    thd->variables.collation_connection= var->save_result.charset;
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2147 2148
    thd->update_charset();
  }
2149 2150 2151
  return 0;
}

2152 2153 2154

byte *sys_var_collation_connection::value_ptr(THD *thd, enum_var_type type,
					      LEX_STRING *base)
2155 2156
{
  CHARSET_INFO *cs= ((type == OPT_GLOBAL) ?
2157 2158 2159
		  global_system_variables.collation_connection :
		  thd->variables.collation_connection);
  return cs ? (byte*) cs->name : (byte*) "NULL";
2160 2161
}

2162

2163
void sys_var_collation_connection::set_default(THD *thd, enum_var_type type)
2164 2165
{
 if (type == OPT_GLOBAL)
2166
   global_system_variables.collation_connection= default_charset_info;
2167
 else
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2168 2169 2170 2171 2172
 {
   thd->variables.collation_connection= (global_system_variables.
					 collation_connection);
   thd->update_charset();
 }
2173 2174
}

2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209
bool sys_var_collation_database::update(THD *thd, set_var *var)
{
  if (var->type == OPT_GLOBAL)
    global_system_variables.collation_database= var->save_result.charset;
  else
  {
    thd->variables.collation_database= var->save_result.charset;
    thd->update_charset();
  }
  return 0;
}


byte *sys_var_collation_database::value_ptr(THD *thd, enum_var_type type,
					      LEX_STRING *base)
{
  CHARSET_INFO *cs= ((type == OPT_GLOBAL) ?
		  global_system_variables.collation_database :
		  thd->variables.collation_database);
  return cs ? (byte*) cs->name : (byte*) "NULL";
}


void sys_var_collation_database::set_default(THD *thd, enum_var_type type)
{
 if (type == OPT_GLOBAL)
   global_system_variables.collation_database= default_charset_info;
 else
 {
   thd->variables.collation_database= (global_system_variables.
					 collation_database);
   thd->update_charset();
 }
}

2210
#if defined(HAVE_REPLICATION) && (MYSQL_VERSION_ID < 50003)
2211 2212 2213 2214 2215 2216
bool sys_var_collation_server::check(THD *thd, set_var *var)
{
  if ((var->type == OPT_GLOBAL) &&
      (mysql_bin_log.is_open() ||
       active_mi->slave_running || active_mi->rli.slave_running))
  {
2217
    my_error(ER_LOGGING_PROHIBIT_CHANGING_OF, MYF(0),
2218
	     "character set, collation");
2219 2220 2221 2222 2223
    return 1;
  }
  return sys_var_collation::check(thd,var);
}
#endif
2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259

bool sys_var_collation_server::update(THD *thd, set_var *var)
{
  if (var->type == OPT_GLOBAL)
    global_system_variables.collation_server= var->save_result.charset;
  else
  {
    thd->variables.collation_server= var->save_result.charset;
    thd->update_charset();
  }
  return 0;
}


byte *sys_var_collation_server::value_ptr(THD *thd, enum_var_type type,
					      LEX_STRING *base)
{
  CHARSET_INFO *cs= ((type == OPT_GLOBAL) ?
		  global_system_variables.collation_server :
		  thd->variables.collation_server);
  return cs ? (byte*) cs->name : (byte*) "NULL";
}


void sys_var_collation_server::set_default(THD *thd, enum_var_type type)
{
 if (type == OPT_GLOBAL)
   global_system_variables.collation_server= default_charset_info;
 else
 {
   thd->variables.collation_server= (global_system_variables.
					 collation_server);
   thd->update_charset();
 }
}

2260

2261
LEX_STRING default_key_cache_base= {(char *) "default", 7 };
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2262

2263
static KEY_CACHE zero_key_cache;
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2264

2265
KEY_CACHE *get_key_cache(LEX_STRING *cache_name)
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2266
{
2267 2268
  safe_mutex_assert_owner(&LOCK_global_system_variables);
  if (!cache_name || ! cache_name->length)
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2269
    cache_name= &default_key_cache_base;
2270
  return ((KEY_CACHE*) find_named(&key_caches,
2271
                                      cache_name->str, cache_name->length, 0));
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2272 2273
}

2274

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2275 2276
byte *sys_var_key_cache_param::value_ptr(THD *thd, enum_var_type type,
					 LEX_STRING *base)
2277
{
2278
  KEY_CACHE *key_cache= get_key_cache(base);
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2279 2280 2281 2282
  if (!key_cache)
    key_cache= &zero_key_cache;
  return (byte*) key_cache + offset ;
}
2283

2284

2285 2286
bool sys_var_key_buffer_size::update(THD *thd, set_var *var)
{
2287
  ulonglong tmp= var->save_result.ulonglong_value;
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2288
  LEX_STRING *base_name= &var->base;
2289
  KEY_CACHE *key_cache;
2290 2291 2292
  bool error= 0;

  /* If no basename, assume it's for the key cache named 'default' */
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2293
  if (!base_name->length)
2294
    base_name= &default_key_cache_base;
2295 2296 2297

  pthread_mutex_lock(&LOCK_global_system_variables);
  key_cache= get_key_cache(base_name);
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2298
                            
2299 2300
  if (!key_cache)
  {
2301
    /* Key cache didn't exists */
2302
    if (!tmp)					// Tried to delete cache
2303 2304 2305 2306 2307 2308
      goto end;					// Ok, nothing to do
    if (!(key_cache= create_key_cache(base_name->str, base_name->length)))
    {
      error= 1;
      goto end;
    }
2309
  }
2310 2311 2312 2313 2314 2315 2316 2317 2318

  /*
    Abort if some other thread is changing the key cache
    TODO: This should be changed so that we wait until the previous
    assignment is done and then do the new assign
  */
  if (key_cache->in_init)
    goto end;

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2319
  if (!tmp)					// Zero size means delete
2320
  {
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2321
    if (key_cache == dflt_key_cache)
2322 2323
      goto end;					// Ignore default key cache

2324
    if (key_cache->key_cache_inited)		// If initied
2325 2326
    {
      /*
2327 2328
	Move tables using this key cache to the default key cache
	and clear the old key cache.
2329
      */
2330
      NAMED_LIST *list; 
2331
      key_cache= (KEY_CACHE *) find_named(&key_caches, base_name->str,
2332
					      base_name->length, &list);
2333 2334
      key_cache->in_init= 1;
      pthread_mutex_unlock(&LOCK_global_system_variables);
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2335
      error= reassign_keycache_tables(thd, key_cache, dflt_key_cache);
2336 2337
      pthread_mutex_lock(&LOCK_global_system_variables);
      key_cache->in_init= 0;
2338
    }
2339 2340 2341 2342 2343
    /*
      We don't delete the key cache as some running threads my still be
      in the key cache code with a pointer to the deleted (empty) key cache
    */
    goto end;
2344 2345
  }

2346 2347
  key_cache->param_buff_size=
    (ulonglong) getopt_ull_limit_value(tmp, option_limits);
2348

2349 2350 2351 2352
  /* If key cache didn't existed initialize it, else resize it */
  key_cache->in_init= 1;
  pthread_mutex_unlock(&LOCK_global_system_variables);

2353
  if (!key_cache->key_cache_inited)
2354
    error= (bool) (ha_init_key_cache("", key_cache));
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2355
  else
2356
    error= (bool)(ha_resize_key_cache(key_cache));
2357

2358 2359
  pthread_mutex_lock(&LOCK_global_system_variables);
  key_cache->in_init= 0;  
2360

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end:
  pthread_mutex_unlock(&LOCK_global_system_variables);
  return error;
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}

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bool sys_var_key_cache_long::update(THD *thd, set_var *var)
2368
{
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  ulong tmp= (ulong) var->value->val_int();
2370
  LEX_STRING *base_name= &var->base;
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  bool error= 0;

2373
  if (!base_name->length)
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    base_name= &default_key_cache_base;
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  pthread_mutex_lock(&LOCK_global_system_variables);
2377
  KEY_CACHE *key_cache= get_key_cache(base_name);
2378

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  if (!key_cache && !(key_cache= create_key_cache(base_name->str,
				                  base_name->length)))
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  {
    error= 1;
    goto end;
  }
2385

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  /*
    Abort if some other thread is changing the key cache
    TODO: This should be changed so that we wait until the previous
    assignment is done and then do the new assign
  */
  if (key_cache->in_init)
    goto end;

  *((ulong*) (((char*) key_cache) + offset))=
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    (ulong) getopt_ull_limit_value(tmp, option_limits);
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  /*
    Don't create a new key cache if it didn't exist
    (key_caches are created only when the user sets block_size)
  */
  key_cache->in_init= 1;
2402

2403
  pthread_mutex_unlock(&LOCK_global_system_variables);
2404

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  error= (bool) (ha_resize_key_cache(key_cache));

  pthread_mutex_lock(&LOCK_global_system_variables);
  key_cache->in_init= 0;  

end:
  pthread_mutex_unlock(&LOCK_global_system_variables);
  return error;
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}

2415

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/*****************************************************************************
  Functions to handle SET NAMES and SET CHARACTER SET
*****************************************************************************/

2420
int set_var_collation_client::check(THD *thd)
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{
  return 0;
}

2425
int set_var_collation_client::update(THD *thd)
2426
{
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  thd->variables.character_set_client= character_set_client;
  thd->variables.character_set_results= character_set_results;
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  thd->variables.collation_connection= collation_connection;
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  thd->update_charset();
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  thd->protocol_simple.init(thd);
  thd->protocol_prep.init(thd);
  return 0;
}

/****************************************************************************/

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bool sys_var_timestamp::update(THD *thd,  set_var *var)
{
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  thd->set_time((time_t) var->save_result.ulonglong_value);
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  return 0;
}


void sys_var_timestamp::set_default(THD *thd, enum_var_type type)
{
  thd->user_time=0;
}


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byte *sys_var_timestamp::value_ptr(THD *thd, enum_var_type type,
				   LEX_STRING *base)
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{
  thd->sys_var_tmp.long_value= (long) thd->start_time;
  return (byte*) &thd->sys_var_tmp.long_value;
}


bool sys_var_last_insert_id::update(THD *thd, set_var *var)
{
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  thd->insert_id(var->save_result.ulonglong_value);
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  return 0;
}


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byte *sys_var_last_insert_id::value_ptr(THD *thd, enum_var_type type,
					LEX_STRING *base)
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{
  thd->sys_var_tmp.long_value= (long) thd->insert_id();
  return (byte*) &thd->last_insert_id;
}


bool sys_var_insert_id::update(THD *thd, set_var *var)
{
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  thd->next_insert_id= var->save_result.ulonglong_value;
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  return 0;
}


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byte *sys_var_insert_id::value_ptr(THD *thd, enum_var_type type,
				   LEX_STRING *base)
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{
  return (byte*) &thd->current_insert_id;
}


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#ifdef HAVE_REPLICATION
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bool sys_var_slave_skip_counter::check(THD *thd, set_var *var)
{
2491
  int result= 0;
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  pthread_mutex_lock(&LOCK_active_mi);
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  pthread_mutex_lock(&active_mi->rli.run_lock);
  if (active_mi->rli.slave_running)
  {
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    my_message(ER_SLAVE_MUST_STOP, ER(ER_SLAVE_MUST_STOP), MYF(0));
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    result=1;
  }
  pthread_mutex_unlock(&active_mi->rli.run_lock);
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  pthread_mutex_unlock(&LOCK_active_mi);
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  var->save_result.ulong_value= (ulong) var->value->val_int();
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  return result;
}


bool sys_var_slave_skip_counter::update(THD *thd, set_var *var)
{
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  pthread_mutex_lock(&LOCK_active_mi);
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  pthread_mutex_lock(&active_mi->rli.run_lock);
  /*
    The following test should normally never be true as we test this
    in the check function;  To be safe against multiple
    SQL_SLAVE_SKIP_COUNTER request, we do the check anyway
  */
  if (!active_mi->rli.slave_running)
  {
    pthread_mutex_lock(&active_mi->rli.data_lock);
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    active_mi->rli.slave_skip_counter= var->save_result.ulong_value;
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    pthread_mutex_unlock(&active_mi->rli.data_lock);
  }
  pthread_mutex_unlock(&active_mi->rli.run_lock);
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  pthread_mutex_unlock(&LOCK_active_mi);
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  return 0;
}
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bool sys_var_sync_binlog_period::update(THD *thd, set_var *var)
{
  pthread_mutex_t *lock_log= mysql_bin_log.get_log_lock();
2530
  sync_binlog_period= (ulong) var->save_result.ulonglong_value;
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  /*
    Must reset the counter otherwise it may already be beyond the new period
    and so the new period will not be taken into account. Need mutex otherwise
    might be cancelled by a simultanate ++ in MYSQL_LOG::write().
  */
  pthread_mutex_lock(lock_log);
  sync_binlog_counter= 0;
  pthread_mutex_unlock(lock_log);
  return 0;
2540
}
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#endif /* HAVE_REPLICATION */
2542

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bool sys_var_rand_seed1::update(THD *thd, set_var *var)
{
2545
  thd->rand.seed1= (ulong) var->save_result.ulonglong_value;
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  return 0;
}

bool sys_var_rand_seed2::update(THD *thd, set_var *var)
{
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  thd->rand.seed2= (ulong) var->save_result.ulonglong_value;
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  return 0;
}


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bool sys_var_thd_time_zone::check(THD *thd, set_var *var)
{
  char buff[MAX_TIME_ZONE_NAME_LENGTH]; 
  String str(buff, sizeof(buff), &my_charset_latin1);
  String *res= var->value->val_str(&str);

2562
#if defined(HAVE_REPLICATION)
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  if ((var->type == OPT_GLOBAL) &&
      (mysql_bin_log.is_open() ||
       active_mi->slave_running || active_mi->rli.slave_running))
  {
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    my_error(ER_LOGGING_PROHIBIT_CHANGING_OF, MYF(0), "time zone");
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    return 1;
  }
#endif
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  if (!(var->save_result.time_zone=
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        my_tz_find(res, thd->lex->time_zone_tables_used)))
2574
  {
2575
    my_error(ER_UNKNOWN_TIME_ZONE, MYF(0), res ? res->c_ptr() : "NULL");
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    return 1;
  }
  return 0;
}


bool sys_var_thd_time_zone::update(THD *thd, set_var *var)
{
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  /* We are using Time_zone object found during check() phase. */
  if (var->type == OPT_GLOBAL)
  {
    pthread_mutex_lock(&LOCK_global_system_variables);
    global_system_variables.time_zone= var->save_result.time_zone;
    pthread_mutex_unlock(&LOCK_global_system_variables);
  }
  else
    thd->variables.time_zone= var->save_result.time_zone;
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  return 0;
}


byte *sys_var_thd_time_zone::value_ptr(THD *thd, enum_var_type type,
				       LEX_STRING *base)
{
  /* 
    We can use ptr() instead of c_ptr() here because String contaning
    time zone name is guaranteed to be zero ended.
  */
  if (type == OPT_GLOBAL)
2605
    return (byte *)(global_system_variables.time_zone->get_name()->ptr());
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  else
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    return (byte *)(thd->variables.time_zone->get_name()->ptr());
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}


void sys_var_thd_time_zone::set_default(THD *thd, enum_var_type type)
{
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 pthread_mutex_lock(&LOCK_global_system_variables);
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 if (type == OPT_GLOBAL)
 {
   if (default_tz_name)
   {
     String str(default_tz_name, &my_charset_latin1);
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     /*
       We are guaranteed to find this time zone since its existence
       is checked during start-up.
     */
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     global_system_variables.time_zone=
       my_tz_find(&str, thd->lex->time_zone_tables_used);
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   }
   else
     global_system_variables.time_zone= my_tz_SYSTEM;
 }
 else
   thd->variables.time_zone= global_system_variables.time_zone;
2631
 pthread_mutex_unlock(&LOCK_global_system_variables);
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}

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bool sys_var_max_user_conn::check(THD *thd, set_var *var)
{
  if (var->type == OPT_GLOBAL)
    return sys_var_thd::check(thd, var);
  else
  {
    /*
      Per-session values of max_user_connections can't be set directly.
      QQ: May be we should have a separate error message for this?
    */
    my_error(ER_GLOBAL_VARIABLE, MYF(0), name);
    return TRUE;
  }
}

bool sys_var_max_user_conn::update(THD *thd, set_var *var)
{
  DBUG_ASSERT(var->type == OPT_GLOBAL);
  pthread_mutex_lock(&LOCK_global_system_variables);
  max_user_connections= var->save_result.ulonglong_value;
  pthread_mutex_unlock(&LOCK_global_system_variables);
  return 0;
}


void sys_var_max_user_conn::set_default(THD *thd, enum_var_type type)
{
  DBUG_ASSERT(type == OPT_GLOBAL);
  pthread_mutex_lock(&LOCK_global_system_variables);
  max_user_connections= (ulong) option_limits->def_value;
  pthread_mutex_unlock(&LOCK_global_system_variables);
}


byte *sys_var_max_user_conn::value_ptr(THD *thd, enum_var_type type,
                                       LEX_STRING *base)
{
  if (type != OPT_GLOBAL &&
      thd->user_connect && thd->user_connect->user_resources.user_conn)
    return (byte*) &(thd->user_connect->user_resources.user_conn);
  return (byte*) &(max_user_connections);
}


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/*
  Functions to update thd->options bits
*/

static bool set_option_bit(THD *thd, set_var *var)
{
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  sys_var_thd_bit *sys_var= ((sys_var_thd_bit*) var->var);
  if ((var->save_result.ulong_value != 0) == sys_var->reverse)
    thd->options&= ~sys_var->bit_flag;
2688
  else
2689
    thd->options|= sys_var->bit_flag;
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  return 0;
}


static bool set_option_autocommit(THD *thd, set_var *var)
{
  /* The test is negative as the flag we use is NOT autocommit */

  ulong org_options=thd->options;

  if (var->save_result.ulong_value != 0)
    thd->options&= ~((sys_var_thd_bit*) var->var)->bit_flag;
  else
    thd->options|= ((sys_var_thd_bit*) var->var)->bit_flag;

  if ((org_options ^ thd->options) & OPTION_NOT_AUTOCOMMIT)
  {
    if ((org_options & OPTION_NOT_AUTOCOMMIT))
    {
      /* We changed to auto_commit mode */
      thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
      thd->server_status|= SERVER_STATUS_AUTOCOMMIT;
      if (ha_commit(thd))
	return 1;
    }
    else
    {
      thd->options&= ~(ulong) (OPTION_STATUS_NO_TRANS_UPDATE);
      thd->server_status&= ~SERVER_STATUS_AUTOCOMMIT;
    }
  }
  return 0;
}

2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734
static int check_log_update(THD *thd, set_var *var)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  if (!(thd->master_access & SUPER_ACL))
  {
    my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), "SUPER");
    return 1;
  }
#endif
  return 0;
}
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static bool set_log_update(THD *thd, set_var *var)
{
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  /*
    The update log is not supported anymore since 5.0.
    See sql/mysqld.cc/, comments in function init_server_components() for an
    explaination of the different warnings we send below
  */
    
2744
  if (opt_sql_bin_update)
2745
  {
2746 2747
    ((sys_var_thd_bit*) var->var)->bit_flag|= (OPTION_BIN_LOG |
					       OPTION_UPDATE_LOG);
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    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
                 ER_UPDATE_LOG_DEPRECATED_TRANSLATED,
                 ER(ER_UPDATE_LOG_DEPRECATED_TRANSLATED));
  }
  else
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
                 ER_UPDATE_LOG_DEPRECATED_IGNORED,
                 ER(ER_UPDATE_LOG_DEPRECATED_IGNORED));
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  set_option_bit(thd, var);
  return 0;
}

2760
static bool set_log_bin(THD *thd, set_var *var)
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{
  if (opt_sql_bin_update)
    ((sys_var_thd_bit*) var->var)->bit_flag|= (OPTION_BIN_LOG |
					       OPTION_UPDATE_LOG);
  set_option_bit(thd, var);
  return 0;
}

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static int check_pseudo_thread_id(THD *thd, set_var *var)
{
  var->save_result.ulonglong_value= var->value->val_int();
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  if (thd->master_access & SUPER_ACL)
    return 0;
  else
  {
    my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), "SUPER");
    return 1;
  }
#else
  return 0;
#endif
}
2784

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static byte *get_warning_count(THD *thd)
{
  thd->sys_var_tmp.long_value=
    (thd->warn_count[(uint) MYSQL_ERROR::WARN_LEVEL_NOTE] +
     thd->warn_count[(uint) MYSQL_ERROR::WARN_LEVEL_WARN]);
  return (byte*) &thd->sys_var_tmp.long_value;
}

static byte *get_error_count(THD *thd)
{
  thd->sys_var_tmp.long_value= 
    thd->warn_count[(uint) MYSQL_ERROR::WARN_LEVEL_ERROR];
  return (byte*) &thd->sys_var_tmp.long_value;
}

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/****************************************************************************
  Main handling of variables:
  - Initialisation
  - Searching during parsing
  - Update loop
****************************************************************************/

/*
  Find variable name in option my_getopt structure used for command line args

  SYNOPSIS
    find_option()
    opt		option structure array to search in
    name	variable name

  RETURN VALUES
    0		Error
    ptr		pointer to option structure
*/

static struct my_option *find_option(struct my_option *opt, const char *name) 
{
  uint length=strlen(name);
  for (; opt->name; opt++)
  {
    if (!getopt_compare_strings(opt->name, name, length) &&
	!opt->name[length])
    {
      /*
	Only accept the option if one can set values through it.
	If not, there is no default value or limits in the option.
      */
      return (opt->value) ? opt : 0;
    }
  }
  return 0;
}


/*
  Return variable name and length for hashing of variables
*/

static byte *get_sys_var_length(const sys_var *var, uint *length,
				my_bool first)
{
  *length= var->name_length;
  return (byte*) var->name;
}


/*
  Initialises sys variables and put them in system_variable_hash
*/


void set_var_init()
{
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  hash_init(&system_variable_hash, system_charset_info,
	    array_elements(sys_variables),0,0,
2861
	    (hash_get_key) get_sys_var_length,0,0);
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  sys_var **var, **end;
  for (var= sys_variables, end= sys_variables+array_elements(sys_variables) ;
       var < end;
       var++)
  {
    (*var)->name_length= strlen((*var)->name);
    (*var)->option_limits= find_option(my_long_options, (*var)->name);
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    my_hash_insert(&system_variable_hash, (byte*) *var);
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  }
  /*
    Special cases
    Needed because MySQL can't find the limits for a variable it it has
    a different name than the command line option.
    As these variables are deprecated, this code will disappear soon...
  */
  sys_sql_max_join_size.option_limits= sys_max_join_size.option_limits;
}


void set_var_free()
{
  hash_free(&system_variable_hash);
}


/*
  Find a user set-table variable

  SYNOPSIS
    find_sys_var()
    str		Name of system variable to find
    length	Length of variable.  zero means that we should use strlen()
		on the variable

  RETURN VALUES
    pointer	pointer to variable definitions
    0		Unknown variable (error message is given)
*/

2901
sys_var *find_sys_var(const char *str, uint length)
2902
{
2903 2904
  sys_var *var= (sys_var*) hash_search(&system_variable_hash,
				       (byte*) str,
2905 2906 2907
				       length ? length :
				       strlen(str));
  if (!var)
2908
    my_error(ER_UNKNOWN_SYSTEM_VARIABLE, MYF(0), (char*) str);
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  return var;
}


/*
  Execute update of all variables

  SYNOPSIS

  sql_set
    THD		Thread id
    set_var	List of variables to update

  DESCRIPTION
    First run a check of all variables that all updates will go ok.
    If yes, then execute all updates, returning an error if any one failed.

    This should ensure that in all normal cases none all or variables are
    updated

    RETURN VALUE
    0	ok
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    1	ERROR, message sent (normally no variables was updated)
    -1  ERROR, message not sent
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*/

2935
int sql_set_variables(THD *thd, List<set_var_base> *var_list)
2936
{
2937
  int error;
2938
  List_iterator_fast<set_var_base> it(*var_list);
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  DBUG_ENTER("sql_set_variables");
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  set_var_base *var;
  while ((var=it++))
  {
2944
    if ((error= var->check(thd)))
2945
      goto err;
2946
  }
2947
  if (!(error= test(thd->net.report_error)))
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  {
    it.rewind();
    while ((var= it++))
      error|= var->update(thd);         // Returns 0, -1 or 1
  }
2953

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err:
  free_underlaid_joins(thd, &thd->lex->select_lex);
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  DBUG_RETURN(error);
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}


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/*
  Say if all variables set by a SET support the ONE_SHOT keyword (currently,
  only character set and collation do; later timezones will).

  SYNOPSIS

  not_all_support_one_shot
    set_var	List of variables to update

  NOTES
    It has a "not_" because it makes faster tests (no need to "!")

    RETURN VALUE
    0	all variables of the list support ONE_SHOT
    1	at least one does not support ONE_SHOT
*/

bool not_all_support_one_shot(List<set_var_base> *var_list)
{
  List_iterator_fast<set_var_base> it(*var_list);
  set_var_base *var;
  while ((var= it++))
  {
    if (var->no_support_one_shot())
      return 1;
  }
  return 0;
}


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/*****************************************************************************
  Functions to handle SET mysql_internal_variable=const_expr
*****************************************************************************/

2994
int set_var::check(THD *thd)
2995 2996 2997
{
  if (var->check_type(type))
  {
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    int err= type == OPT_GLOBAL ? ER_LOCAL_VARIABLE : ER_GLOBAL_VARIABLE;
2999
    my_error(err, MYF(0), var->name);
3000
    return -1;
3001 3002 3003 3004 3005 3006 3007 3008
  }
  if ((type == OPT_GLOBAL && check_global_access(thd, SUPER_ACL)))
    return 1;
  /* value is a NULL pointer if we are using SET ... = DEFAULT */
  if (!value)
  {
    if (var->check_default(type))
    {
3009
      my_error(ER_NO_DEFAULT, MYF(0), var->name);
3010
      return -1;
3011 3012 3013 3014
    }
    return 0;
  }

3015
  if ((!value->fixed &&
3016
       value->fix_fields(thd, 0, &value)) || value->check_cols(1))
3017
    return -1;
3018 3019
  if (var->check_update_type(value->result_type()))
  {
3020
    my_error(ER_WRONG_TYPE_FOR_VAR, MYF(0), var->name);
3021
    return -1;
3022
  }
3023
  return var->check(thd, this) ? -1 : 0;
3024 3025 3026
}


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/*
  Check variable, but without assigning value (used by PS)

  SYNOPSIS
    set_var::light_check()
    thd		thread handler

  RETURN VALUE
    0	ok
    1	ERROR, message sent (normally no variables was updated)
    -1  ERROR, message not sent
*/
3039 3040 3041 3042
int set_var::light_check(THD *thd)
{
  if (var->check_type(type))
  {
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3043
    int err= type == OPT_GLOBAL ? ER_LOCAL_VARIABLE : ER_GLOBAL_VARIABLE;
3044
    my_error(err, MYF(0), var->name);
3045 3046
    return -1;
  }
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3047
  if (type == OPT_GLOBAL && check_global_access(thd, SUPER_ACL))
3048 3049
    return 1;

3050 3051
  if (value && ((!value->fixed && value->fix_fields(thd, 0, &value)) ||
                value->check_cols(1)))
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    return -1;
  return 0;
}


3057
int set_var::update(THD *thd)
3058 3059 3060 3061
{
  if (!value)
    var->set_default(thd, type);
  else if (var->update(thd, this))
3062
    return -1;				// should never happen
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  if (var->after_update)
    (*var->after_update)(thd, type);
  return 0;
}


/*****************************************************************************
  Functions to handle SET @user_variable=const_expr
*****************************************************************************/

3073
int set_var_user::check(THD *thd)
3074
{
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3075 3076
  /*
    Item_func_set_user_var can't substitute something else on its place =>
3077
    0 can be passed as last argument (reference on item)
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3078 3079
  */
  return (user_var_item->fix_fields(thd, 0, (Item**) 0) ||
3080
	  user_var_item->check()) ? -1 : 0;
3081 3082 3083
}


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3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095
/*
  Check variable, but without assigning value (used by PS)

  SYNOPSIS
    set_var_user::light_check()
    thd		thread handler

  RETURN VALUE
    0	ok
    1	ERROR, message sent (normally no variables was updated)
    -1  ERROR, message not sent
*/
3096 3097 3098 3099 3100 3101 3102 3103 3104 3105
int set_var_user::light_check(THD *thd)
{
  /*
    Item_func_set_user_var can't substitute something else on its place =>
    0 can be passed as last argument (reference on item)
  */
  return (user_var_item->fix_fields(thd, 0, (Item**) 0));
}


3106
int set_var_user::update(THD *thd)
3107 3108 3109 3110
{
  if (user_var_item->update())
  {
    /* Give an error if it's not given already */
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3111
    my_message(ER_SET_CONSTANTS_ONLY, ER(ER_SET_CONSTANTS_ONLY), MYF(0));
3112
    return -1;
3113 3114 3115 3116 3117 3118 3119 3120 3121
  }
  return 0;
}


/*****************************************************************************
  Functions to handle SET PASSWORD
*****************************************************************************/

3122
int set_var_password::check(THD *thd)
3123
{
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3124
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3125 3126
  if (!user->host.str)
    user->host.str= (char*) thd->host_or_ip;
3127
  /* Returns 1 as the function sends error to client */
3128 3129
  return check_change_password(thd, user->host.str, user->user.str,
                               password, strlen(password)) ? 1 : 0;
3130
#else
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3131 3132
  return 0;
#endif
3133 3134
}

3135
int set_var_password::update(THD *thd)
3136
{
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3137
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3138
  /* Returns 1 as the function sends error to client */
3139 3140
  return change_password(thd, user->host.str, user->user.str, password) ?
	  1 : 0;
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3141 3142 3143
#else
  return 0;
#endif
3144 3145
}

3146 3147 3148 3149
/****************************************************************************
 Functions to handle table_type
****************************************************************************/

3150 3151
/* Based upon sys_var::check_enum() */

3152
bool sys_var_thd_storage_engine::check(THD *thd, set_var *var)
3153
{
3154
  char buff[STRING_BUFFER_USUAL_SIZE];
3155 3156 3157 3158 3159
  const char *value;
  String str(buff, sizeof(buff), &my_charset_latin1), *res;

  if (var->value->result_type() == STRING_RESULT)
  {
3160
    enum db_type db_type;
3161 3162
    if (!(res=var->value->val_str(&str)) ||
	!(var->save_result.ulong_value=
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3163
	 (ulong) (db_type= ha_resolve_by_name(res->ptr(), res->length()))) ||
3164
	ha_checktype(db_type) != db_type) 
3165 3166 3167 3168 3169 3170
    {
      value= res ? res->c_ptr() : "NULL";
      goto err;
    }
    return 0;
  }
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3171
  value= "unknown";
3172 3173

err:
3174
  my_error(ER_UNKNOWN_STORAGE_ENGINE, MYF(0), value);
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3175
  return 1;
3176 3177
}

3178

3179 3180
byte *sys_var_thd_storage_engine::value_ptr(THD *thd, enum_var_type type,
					    LEX_STRING *base)
3181 3182 3183 3184
{
  ulong val;
  val= ((type == OPT_GLOBAL) ? global_system_variables.*offset :
        thd->variables.*offset);
3185
  const char *table_type= ha_get_storage_engine((enum db_type)val);
3186
  return (byte *) table_type;
3187 3188
}

3189

3190
void sys_var_thd_storage_engine::set_default(THD *thd, enum_var_type type)
3191 3192 3193 3194 3195 3196 3197
{
  if (type == OPT_GLOBAL)
    global_system_variables.*offset= (ulong) DB_TYPE_MYISAM;
  else
    thd->variables.*offset= (ulong) (global_system_variables.*offset);
}

3198

3199
bool sys_var_thd_storage_engine::update(THD *thd, set_var *var)
3200 3201 3202 3203 3204 3205 3206 3207
{
  if (var->type == OPT_GLOBAL)
    global_system_variables.*offset= var->save_result.ulong_value;
  else
    thd->variables.*offset= var->save_result.ulong_value;
  return 0;
}

3208 3209 3210 3211
void sys_var_thd_table_type::warn_deprecated(THD *thd)
{
  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
		      ER_WARN_DEPRECATED_SYNTAX,
3212 3213
		      ER(ER_WARN_DEPRECATED_SYNTAX), "table_type",
                      "storage_engine"); 
3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227
}

void sys_var_thd_table_type::set_default(THD *thd, enum_var_type type)
{
  warn_deprecated(thd);
  sys_var_thd_storage_engine::set_default(thd, type);
}

bool sys_var_thd_table_type::update(THD *thd, set_var *var)
{
  warn_deprecated(thd);
  return sys_var_thd_storage_engine::update(thd, var);
}

3228

3229 3230 3231
/****************************************************************************
 Functions to handle sql_mode
****************************************************************************/
3232

3233 3234
byte *sys_var_thd_sql_mode::value_ptr(THD *thd, enum_var_type type,
				      LEX_STRING *base)
3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274
{
  ulong val;
  char buff[256];
  String tmp(buff, sizeof(buff), &my_charset_latin1);

  tmp.length(0);
  val= ((type == OPT_GLOBAL) ? global_system_variables.*offset :
        thd->variables.*offset);
  for (uint i= 0; val; val>>= 1, i++)
  {
    if (val & 1)
    {
      tmp.append(enum_names->type_names[i]);
      tmp.append(',');
    }
  }
  if (tmp.length())
    tmp.length(tmp.length() - 1);
  return (byte*) thd->strmake(tmp.ptr(), tmp.length());
}


void sys_var_thd_sql_mode::set_default(THD *thd, enum_var_type type)
{
  if (type == OPT_GLOBAL)
    global_system_variables.*offset= 0;
  else
    thd->variables.*offset= global_system_variables.*offset;
}

void fix_sql_mode_var(THD *thd, enum_var_type type)
{
  if (type == OPT_GLOBAL)
    global_system_variables.sql_mode=
      fix_sql_mode(global_system_variables.sql_mode);
  else
    thd->variables.sql_mode= fix_sql_mode(thd->variables.sql_mode);
}

/* Map database specific bits to function bits */
3275

3276 3277 3278 3279 3280 3281 3282 3283 3284
ulong fix_sql_mode(ulong sql_mode)
{
  /*
    Note that we dont set 
    MODE_NO_KEY_OPTIONS | MODE_NO_TABLE_OPTIONS | MODE_NO_FIELD_OPTIONS
    to allow one to get full use of MySQL in this mode.
  */

  if (sql_mode & MODE_ANSI)
3285
  {
3286
    sql_mode|= (MODE_REAL_AS_FLOAT | MODE_PIPES_AS_CONCAT | MODE_ANSI_QUOTES |
3287 3288 3289 3290 3291 3292
		MODE_IGNORE_SPACE);
    /* 
      MODE_ONLY_FULL_GROUP_BY removed from ANSI mode because it is currently
      overly restrictive (see BUG#8510).
    */
  }
3293 3294 3295 3296
  if (sql_mode & MODE_ORACLE)
    sql_mode|= (MODE_PIPES_AS_CONCAT | MODE_ANSI_QUOTES |
		MODE_IGNORE_SPACE |
		MODE_NO_KEY_OPTIONS | MODE_NO_TABLE_OPTIONS |
3297
		MODE_NO_FIELD_OPTIONS | MODE_NO_AUTO_CREATE_USER);
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  if (sql_mode & MODE_MSSQL)
    sql_mode|= (MODE_PIPES_AS_CONCAT | MODE_ANSI_QUOTES |
		MODE_IGNORE_SPACE |
		MODE_NO_KEY_OPTIONS | MODE_NO_TABLE_OPTIONS |
		MODE_NO_FIELD_OPTIONS);
  if (sql_mode & MODE_POSTGRESQL)
    sql_mode|= (MODE_PIPES_AS_CONCAT | MODE_ANSI_QUOTES |
		MODE_IGNORE_SPACE |
		MODE_NO_KEY_OPTIONS | MODE_NO_TABLE_OPTIONS |
		MODE_NO_FIELD_OPTIONS);
  if (sql_mode & MODE_DB2)
    sql_mode|= (MODE_PIPES_AS_CONCAT | MODE_ANSI_QUOTES |
		MODE_IGNORE_SPACE |
		MODE_NO_KEY_OPTIONS | MODE_NO_TABLE_OPTIONS |
		MODE_NO_FIELD_OPTIONS);
3313
  if (sql_mode & MODE_MAXDB)
3314 3315 3316
    sql_mode|= (MODE_PIPES_AS_CONCAT | MODE_ANSI_QUOTES |
		MODE_IGNORE_SPACE |
		MODE_NO_KEY_OPTIONS | MODE_NO_TABLE_OPTIONS |
3317
		MODE_NO_FIELD_OPTIONS | MODE_NO_AUTO_CREATE_USER);
3318
  if (sql_mode & MODE_MYSQL40)
3319
    sql_mode|= MODE_NO_FIELD_OPTIONS | MODE_HIGH_NOT_PRECEDENCE;
3320
  if (sql_mode & MODE_MYSQL323)
3321
    sql_mode|= MODE_NO_FIELD_OPTIONS | MODE_HIGH_NOT_PRECEDENCE;
3322 3323 3324
  if (sql_mode & MODE_TRADITIONAL)
    sql_mode|= (MODE_STRICT_TRANS_TABLES | MODE_STRICT_ALL_TABLES |
                MODE_NO_ZERO_IN_DATE | MODE_NO_ZERO_DATE |
3325
                MODE_ERROR_FOR_DIVISION_BY_ZERO | MODE_NO_AUTO_CREATE_USER);
3326 3327
  return sql_mode;
}
3328 3329


3330 3331 3332 3333
/****************************************************************************
  Named list handling
****************************************************************************/

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3334 3335
gptr find_named(I_List<NAMED_LIST> *list, const char *name, uint length,
		NAMED_LIST **found)
3336 3337 3338 3339 3340 3341
{
  I_List_iterator<NAMED_LIST> it(*list);
  NAMED_LIST *element;
  while ((element= it++))
  {
    if (element->cmp(name, length))
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3342
    {
3343 3344
      if (found)
        *found= element;
3345
      return element->data;
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3346
    }
3347 3348 3349 3350 3351
  }
  return 0;
}


3352 3353
void delete_elements(I_List<NAMED_LIST> *list,
		     void (*free_element)(const char *name, gptr))
3354 3355
{
  NAMED_LIST *element;
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3356
  DBUG_ENTER("delete_elements");
3357 3358
  while ((element= list->get()))
  {
3359
    (*free_element)(element->name, element->data);
3360 3361
    delete element;
  }
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3362
  DBUG_VOID_RETURN;
3363 3364 3365 3366 3367
}


/* Key cache functions */

3368
static KEY_CACHE *create_key_cache(const char *name, uint length)
3369
{
3370
  KEY_CACHE *key_cache;
3371 3372 3373
  DBUG_ENTER("create_key_cache");
  DBUG_PRINT("enter",("name: %.*s", length, name));
  
3374
  if ((key_cache= (KEY_CACHE*) my_malloc(sizeof(KEY_CACHE),
3375
					     MYF(MY_ZEROFILL | MY_WME))))
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3376 3377
  {
    if (!new NAMED_LIST(&key_caches, name, length, (gptr) key_cache))
3378 3379
    {
      my_free((char*) key_cache, MYF(0));
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3380
      key_cache= 0;
3381 3382 3383 3384 3385 3386 3387 3388 3389
    }
    else
    {
      /*
	Set default values for a key cache
	The values in dflt_key_cache_var is set by my_getopt() at startup

	We don't set 'buff_size' as this is used to enable the key cache
      */
3390 3391 3392
      key_cache->param_block_size=     dflt_key_cache_var.param_block_size;
      key_cache->param_division_limit= dflt_key_cache_var.param_division_limit;
      key_cache->param_age_threshold=  dflt_key_cache_var.param_age_threshold;
3393
    }
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3394
  }
3395
  DBUG_RETURN(key_cache);
3396 3397 3398
}


3399
KEY_CACHE *get_or_create_key_cache(const char *name, uint length)
3400
{
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3401
  LEX_STRING key_cache_name;
3402
  KEY_CACHE *key_cache;
3403

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3404 3405
  key_cache_name.str= (char *) name;
  key_cache_name.length= length;
3406 3407
  pthread_mutex_lock(&LOCK_global_system_variables);
  if (!(key_cache= get_key_cache(&key_cache_name)))
3408
    key_cache= create_key_cache(name, length);
3409
  pthread_mutex_unlock(&LOCK_global_system_variables);
3410 3411 3412 3413
  return key_cache;
}


3414
void free_key_cache(const char *name, KEY_CACHE *key_cache)
3415
{
3416 3417
  ha_end_key_cache(key_cache);
  my_free((char*) key_cache, MYF(0));
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}


3421
bool process_key_caches(int (* func) (const char *name, KEY_CACHE *))
3422
{
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3423 3424
  I_List_iterator<NAMED_LIST> it(key_caches);
  NAMED_LIST *element;
3425

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3426 3427
  while ((element= it++))
  {
3428
    KEY_CACHE *key_cache= (KEY_CACHE *) element->data;
3429
    func(element->name, key_cache);
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3430 3431
  }
  return 0;
3432 3433
}

3434

3435 3436 3437 3438 3439 3440
/****************************************************************************
  Used templates
****************************************************************************/

#ifdef __GNUC__
template class List<set_var_base>;
3441
template class List_iterator_fast<set_var_base>;
3442
template class I_List_iterator<NAMED_LIST>;
3443
#endif