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| -rw-r--r-- | sql/sys_vars.ic | 2806 |
1 files changed, 2806 insertions, 0 deletions
diff --git a/sql/sys_vars.ic b/sql/sys_vars.ic new file mode 100644 index 00000000..97e3a28b --- /dev/null +++ b/sql/sys_vars.ic @@ -0,0 +1,2806 @@ +/* Copyright (c) 2002, 2011, Oracle and/or its affiliates. + Copyright (c) 2010, 2020, MariaDB Corporation. + + 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; version 2 of the License. + + 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */ + +/** + @file + "private" interface to sys_var - server configuration variables. + + This header is included only by the file that contains declarations + of sys_var variables (sys_vars.cc). +*/ + +#include "sys_vars_shared.h" +#include <my_getopt.h> +#include <my_bit.h> +#include <my_dir.h> +#include "keycaches.h" +#include "strfunc.h" +#include "tztime.h" // my_tz_find, my_tz_SYSTEM, struct Time_zone +#include "rpl_mi.h" // For Multi-Source Replication +#include "debug_sync.h" +#include "sql_acl.h" // check_global_access() + +/* + a set of mostly trivial (as in f(X)=X) defines below to make system variable + declarations more readable +*/ +#define VALID_RANGE(X,Y) X,Y +#define DEFAULT(X) X +#define BLOCK_SIZE(X) X +#define GLOBAL_VAR(X) sys_var::GLOBAL, (((char*)&(X))-(char*)&global_system_variables), sizeof(X) +#define SESSION_VAR(X) sys_var::SESSION, offsetof(SV, X), sizeof(((SV *)0)->X) +#define SESSION_ONLY(X) sys_var::ONLY_SESSION, offsetof(SV, X), sizeof(((SV *)0)->X) +#define NO_CMD_LINE CMD_LINE(NO_ARG, sys_var::NO_GETOPT) +#define CMD_LINE_HELP_ONLY CMD_LINE(NO_ARG, sys_var::GETOPT_ONLY_HELP) +/* + the define below means that there's no *second* mutex guard, + LOCK_global_system_variables always guards all system variables +*/ +#define NO_MUTEX_GUARD ((PolyLock*)0) +#define IN_BINLOG sys_var::SESSION_VARIABLE_IN_BINLOG +#define NOT_IN_BINLOG sys_var::VARIABLE_NOT_IN_BINLOG +#define ON_READ(X) X +#define ON_CHECK(X) X +#define ON_UPDATE(X) X +#define READ_ONLY sys_var::READONLY+ +#define AUTO_SET sys_var::AUTO_SET+ +// this means that Sys_var_charptr initial value was malloc()ed +#define PREALLOCATED sys_var::ALLOCATED+ +#define PARSED_EARLY sys_var::PARSE_EARLY+ +#define NO_SET_STMT sys_var::NO_SET_STATEMENT+ + +/* + Sys_var_bit meaning is reversed, like in + @@foreign_key_checks <-> OPTION_NO_FOREIGN_KEY_CHECKS +*/ +#define REVERSE(X) ~(X) +#define DEPRECATED(X) X + +#define session_var(THD, TYPE) (*(TYPE*)session_var_ptr(THD)) +#define global_var(TYPE) (*(TYPE*)global_var_ptr()) + +#if SIZEOF_OFF_T > 4 && defined(BIG_TABLES) +#define GET_HA_ROWS GET_ULL +#else +#define GET_HA_ROWS GET_ULONG +#endif + +// Disable warning caused by SESSION_VAR() macro +#ifdef __clang__ +#pragma clang diagnostic ignored "-Winvalid-offsetof" +#endif + +/* + special assert for sysvars. Tells the name of the variable, + and fails even in non-debug builds. + + It is supposed to be used *only* in Sys_var* constructors, + and has name_arg hard-coded to prevent incorrect usage. +*/ +#define SYSVAR_ASSERT(X) \ + while(!(X)) \ + { \ + fprintf(stderr, "Sysvar '%s' failed '%s'\n", name_arg, #X); \ + DBUG_ASSERT(0); \ + exit(255); \ + } + + +static const char *bool_values[3]= {"OFF", "ON", 0}; +TYPELIB bool_typelib={ array_elements(bool_values)-1, "", bool_values, 0 }; + + +template<class BASE, privilege_t GLOBAL_PRIV, privilege_t SESSION_PRIV> +class Sys_var_on_access: public BASE +{ + using BASE::BASE; + bool on_check_access_global(THD *thd) const override + { + return check_global_access(thd, GLOBAL_PRIV); + } + bool on_check_access_session(THD *thd) const override + { + return check_global_access(thd, SESSION_PRIV); + } +}; + + +template<class BASE, privilege_t GLOBAL_PRIV> +class Sys_var_on_access_global: public BASE +{ + using BASE::BASE; + bool on_check_access_global(THD *thd) const override + { + return check_global_access(thd, GLOBAL_PRIV); + } +}; + + +template<class BASE, privilege_t SESSION_PRIV> +class Sys_var_on_access_session: public BASE +{ + using BASE::BASE; + bool on_check_access_session(THD *thd) const override + { + return check_global_access(thd, SESSION_PRIV); + } +}; + + +/** + A small wrapper class to pass getopt arguments as a pair + to the Sys_var_* constructors. It improves type safety and helps + to catch errors in the argument order. +*/ +struct CMD_LINE +{ + int id; + enum get_opt_arg_type arg_type; + CMD_LINE(enum get_opt_arg_type getopt_arg_type, int getopt_id=0) + : id(getopt_id), arg_type(getopt_arg_type) {} +}; + +/** + Sys_var_integer template is used to generate Sys_var_* classes + for variables that represent the value as an integer number. + They are Sys_var_uint, Sys_var_ulong, Sys_var_harows, Sys_var_ulonglong, + Sys_var_int. + + An integer variable has a minimal and maximal values, and a "block_size" + (any valid value of the variable must be divisible by the block_size). + + Class specific constructor arguments: min, max, block_size + Backing store: int, uint, ulong, ha_rows, ulonglong, depending on the class +*/ +template <typename T, ulong ARGT, enum enum_mysql_show_type SHOWT> +class Sys_var_integer: public sys_var +{ +public: + Sys_var_integer(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + T min_val, T max_val, T def_val, uint block_size, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, off, getopt.id, + getopt.arg_type, SHOWT, def_val, lock, binlog_status_arg, + on_check_func, on_update_func, substitute) + { + option.var_type|= ARGT; + option.min_value= min_val; + option.max_value= max_val; + option.block_size= block_size; + if ((option.u_max_value= (uchar**) max_var_ptr())) + { + *((T*) option.u_max_value)= max_val; + } + + global_var(T)= def_val; + SYSVAR_ASSERT(size == sizeof(T)); + SYSVAR_ASSERT(min_val < max_val); + SYSVAR_ASSERT(min_val <= def_val); + SYSVAR_ASSERT(max_val >= def_val); + SYSVAR_ASSERT(block_size > 0); + SYSVAR_ASSERT(def_val % block_size == 0); + } + bool do_check(THD *thd, set_var *var) + { + my_bool fixed= FALSE, unused; + longlong v= var->value->val_int(); + + if ((ARGT == GET_HA_ROWS) || (ARGT == GET_UINT) || + (ARGT == GET_ULONG) || (ARGT == GET_ULL)) + { + ulonglong uv; + + /* + if the value is signed and negative, + and a variable is unsigned, it is set to zero + */ + if ((fixed= (!var->value->unsigned_flag && v < 0))) + uv= 0; + else + uv= v; + + var->save_result.ulonglong_value= + getopt_ull_limit_value(uv, &option, &unused); + + if (max_var_ptr() && (T)var->save_result.ulonglong_value > get_max_var()) + var->save_result.ulonglong_value= get_max_var(); + + fixed= fixed || var->save_result.ulonglong_value != uv; + } + else + { + /* + if the value is unsigned and has the highest bit set + and a variable is signed, it is set to max signed value + */ + if ((fixed= (var->value->unsigned_flag && v < 0))) + v= LONGLONG_MAX; + + var->save_result.longlong_value= + getopt_ll_limit_value(v, &option, &unused); + + if (max_var_ptr() && (T)var->save_result.longlong_value > get_max_var()) + var->save_result.longlong_value= get_max_var(); + + fixed= fixed || var->save_result.longlong_value != v; + } + return throw_bounds_warning(thd, name.str, fixed, + var->value->unsigned_flag, v); + } + bool session_update(THD *thd, set_var *var) + { + session_var(thd, T)= static_cast<T>(var->save_result.ulonglong_value); + return false; + } + bool global_update(THD *thd, set_var *var) + { + global_var(T)= static_cast<T>(var->save_result.ulonglong_value); + return false; + } + void session_save_default(THD *thd, set_var *var) + { var->save_result.ulonglong_value= (ulonglong)*(T*)global_value_ptr(thd, 0); } + void global_save_default(THD *thd, set_var *var) + { var->save_result.ulonglong_value= option.def_value; } + private: + T get_max_var() { return *((T*) max_var_ptr()); } + const uchar *default_value_ptr(THD *thd) const { return (uchar*) &option.def_value; } +}; + +typedef Sys_var_integer<int, GET_INT, SHOW_SINT> Sys_var_int; +typedef Sys_var_integer<uint, GET_UINT, SHOW_UINT> Sys_var_uint; +typedef Sys_var_integer<ulong, GET_ULONG, SHOW_ULONG> Sys_var_ulong; +typedef Sys_var_integer<ha_rows, GET_HA_ROWS, SHOW_HA_ROWS> Sys_var_harows; +typedef Sys_var_integer<ulonglong, GET_ULL, SHOW_ULONGLONG> Sys_var_ulonglong; +typedef Sys_var_integer<long, GET_LONG, SHOW_SLONG> Sys_var_long; + + +template<> const uchar *Sys_var_int::default_value_ptr(THD *thd) const +{ + thd->sys_var_tmp.int_value= (int)option.def_value; + return (uchar*) &thd->sys_var_tmp.int_value; +} + +template<> const uchar *Sys_var_uint::default_value_ptr(THD *thd) const +{ + thd->sys_var_tmp.uint_value= (uint)option.def_value; + return (uchar*) &thd->sys_var_tmp.uint_value; +} + +template<> const uchar *Sys_var_long::default_value_ptr(THD *thd) const +{ + thd->sys_var_tmp.long_value= (long)option.def_value; + return (uchar*) &thd->sys_var_tmp.long_value; +} + +template<> const uchar *Sys_var_ulong::default_value_ptr(THD *thd) const +{ + thd->sys_var_tmp.ulong_value= (ulong)option.def_value; + return (uchar*) &thd->sys_var_tmp.ulong_value; +} + + +/** + Helper class for variables that take values from a TYPELIB +*/ +class Sys_var_typelib: public sys_var +{ +protected: + TYPELIB typelib; + virtual bool check_maximum(THD *thd, set_var *var, + const char *c_val, longlong i_val) + { return FALSE; } +public: + Sys_var_typelib(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, + CMD_LINE getopt, + SHOW_TYPE show_val_type_arg, const char *values[], + ulonglong def_val, PolyLock *lock, + enum binlog_status_enum binlog_status_arg, + on_check_function on_check_func, on_update_function on_update_func, + const char *substitute) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, off, getopt.id, + getopt.arg_type, show_val_type_arg, def_val, lock, + binlog_status_arg, on_check_func, + on_update_func, substitute) + { + for (typelib.count= 0; values[typelib.count]; typelib.count++) /*no-op */; + typelib.name=""; + typelib.type_names= values; + typelib.type_lengths= 0; // only used by Fields_enum and Field_set + option.typelib= &typelib; + } + bool do_check(THD *thd, set_var *var) // works for enums and my_bool + { + char buff[STRING_BUFFER_USUAL_SIZE]; + String str(buff, sizeof(buff), system_charset_info), *res; + + if (var->value->result_type() == STRING_RESULT) + { + if (!(res=var->value->val_str(&str))) + return true; + else + if (!(var->save_result.ulonglong_value= + find_type(&typelib, res->ptr(), res->length(), false))) + return true; + else + var->save_result.ulonglong_value--; + return check_maximum(thd, var, res->ptr(), 0); + } + + longlong tmp=var->value->val_int(); + if (tmp < 0 || tmp >= typelib.count) + return true; + var->save_result.ulonglong_value= tmp; + return check_maximum(thd, var, 0, tmp); + } +}; + +/** + The class for ENUM variables - variables that take one value from a fixed + list of values. + + Class specific constructor arguments: + char* values[] - 0-terminated list of strings of valid values + + Backing store: ulong + + @note + Do *not* use "enum FOO" variables as a backing store, there is no + guarantee that sizeof(enum FOO) == sizeof(uint), there is no guarantee + even that sizeof(enum FOO) == sizeof(enum BAR) +*/ +class Sys_var_enum: public Sys_var_typelib +{ +public: + Sys_var_enum(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + const char *values[], uint def_val, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : Sys_var_typelib(name_arg, comment, flag_args, off, getopt, + SHOW_CHAR, values, def_val, lock, + binlog_status_arg, on_check_func, on_update_func, + substitute) + { + option.var_type|= GET_ENUM; + option.min_value= 0; + option.max_value= ULONG_MAX; + global_var(ulong)= def_val; + if ((option.u_max_value= (uchar**)max_var_ptr())) + { + *((ulong *) option.u_max_value)= ULONG_MAX; + } + SYSVAR_ASSERT(def_val < typelib.count); + SYSVAR_ASSERT(size == sizeof(ulong)); + } + bool check_maximum(THD *thd, set_var *var, + const char *c_val, longlong i_val) + { + if (!max_var_ptr() || + var->save_result.ulonglong_value <= get_max_var()) + return FALSE; + var->save_result.ulonglong_value= get_max_var(); + + return c_val ? throw_bounds_warning(thd, name.str, c_val) : + throw_bounds_warning(thd, name.str, TRUE, + var->value->unsigned_flag, i_val); + } + bool session_update(THD *thd, set_var *var) + { + session_var(thd, ulong)= static_cast<ulong>(var->save_result.ulonglong_value); + return false; + } + bool global_update(THD *thd, set_var *var) + { + global_var(ulong)= static_cast<ulong>(var->save_result.ulonglong_value); + return false; + } + void session_save_default(THD *thd, set_var *var) + { var->save_result.ulonglong_value= global_var(ulong); } + void global_save_default(THD *thd, set_var *var) + { var->save_result.ulonglong_value= option.def_value; } + const uchar *valptr(THD *thd, ulong val) const + { return reinterpret_cast<const uchar*>(typelib.type_names[val]); } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return valptr(thd, session_var(thd, ulong)); } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return valptr(thd, global_var(ulong)); } + const uchar *default_value_ptr(THD *thd) const + { return valptr(thd, (ulong)option.def_value); } + + ulong get_max_var() { return *((ulong *) max_var_ptr()); } +}; + +/** + The class for boolean variables - a variant of ENUM variables + with the fixed list of values of { OFF , ON } + + Backing store: my_bool +*/ +class Sys_var_mybool: public Sys_var_typelib +{ +public: + Sys_var_mybool(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + my_bool def_val, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : Sys_var_typelib(name_arg, comment, flag_args, off, getopt, + SHOW_MY_BOOL, bool_values, def_val, lock, + binlog_status_arg, on_check_func, on_update_func, + substitute) + { + option.var_type|= GET_BOOL; + global_var(my_bool)= def_val; + SYSVAR_ASSERT(def_val < 2); + SYSVAR_ASSERT(getopt.arg_type == OPT_ARG || getopt.id < 0); + SYSVAR_ASSERT(size == sizeof(my_bool)); + } + bool session_update(THD *thd, set_var *var) + { + session_var(thd, my_bool)= var->save_result.ulonglong_value != 0; + return false; + } + bool global_update(THD *thd, set_var *var) + { + global_var(my_bool)= var->save_result.ulonglong_value != 0; + return false; + } + void session_save_default(THD *thd, set_var *var) + { var->save_result.ulonglong_value= (ulonglong)*(my_bool *)global_value_ptr(thd, 0); } + void global_save_default(THD *thd, set_var *var) + { var->save_result.ulonglong_value= option.def_value; } + const uchar *default_value_ptr(THD *thd) const + { + thd->sys_var_tmp.my_bool_value=(my_bool) option.def_value; + return (uchar*) &thd->sys_var_tmp.my_bool_value; + } +}; + +/** + The class for string variables. The string can be in character_set_filesystem + or in character_set_system. The string can be allocated with my_malloc() + or not. The state of the initial value is specified in the constructor, + after that it's managed automatically. The value of NULL is supported. + + Backing store: char* + + @note + This class supports only GLOBAL variables, because THD on destruction + does not destroy individual members of SV, there's no way to free + allocated string variables for every thread. +*/ +class Sys_var_charptr_base: public sys_var +{ +public: + Sys_var_charptr_base(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + const char *def_val, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, off, getopt.id, + getopt.arg_type, SHOW_CHAR_PTR, (intptr)def_val, + lock, binlog_status_arg, on_check_func, on_update_func, + substitute) + { + /* + use GET_STR_ALLOC - if ALLOCATED it must be *always* allocated, + otherwise (GET_STR) you'll never know whether to free it or not. + (think of an exit because of an error right after my_getopt) + */ + option.var_type|= (flags & ALLOCATED) ? GET_STR_ALLOC : GET_STR; + global_var(const char*)= def_val; + } + void cleanup() + { + if (flags & ALLOCATED) + { + my_free(global_var(char*)); + global_var(char *)= NULL; + } + flags&= ~ALLOCATED; + } + static bool do_string_check(THD *thd, set_var *var, CHARSET_INFO *charset) + { + char buff[STRING_BUFFER_USUAL_SIZE], buff2[STRING_BUFFER_USUAL_SIZE]; + String str(buff, sizeof(buff), charset); + String str2(buff2, sizeof(buff2), charset), *res; + + if (!(res=var->value->val_str(&str))) + { + var->save_result.string_value.str= 0; + var->save_result.string_value.length= 0; // safety + } + else + { + uint32 unused; + if (String::needs_conversion(res->length(), res->charset(), + charset, &unused)) + { + uint errors; + str2.copy(res->ptr(), res->length(), res->charset(), charset, + &errors); + res=&str2; + + } + var->save_result.string_value.str= thd->strmake(res->ptr(), res->length()); + var->save_result.string_value.length= res->length(); + } + + return false; + } + bool do_check(THD *thd, set_var *var) + { return do_string_check(thd, var, charset(thd)); } + bool session_update(THD *thd, set_var *var)= 0; + char *global_update_prepare(THD *thd, set_var *var) + { + char *new_val, *ptr= var->save_result.string_value.str; + size_t len=var->save_result.string_value.length; + if (ptr) + { + new_val= (char*)my_memdup(key_memory_Sys_var_charptr_value, + ptr, len+1, MYF(MY_WME)); + if (!new_val) return 0; + new_val[len]=0; + } + else + new_val= 0; + return new_val; + } + void global_update_finish(char *new_val) + { + if (flags & ALLOCATED) + my_free(global_var(char*)); + flags|= ALLOCATED; + global_var(char*)= new_val; + } + bool global_update(THD *thd, set_var *var) + { + char *new_val= global_update_prepare(thd, var); + global_update_finish(new_val); + return (new_val == 0 && var->save_result.string_value.str != 0); + } + void session_save_default(THD *thd, set_var *var)= 0; + void global_save_default(THD *thd, set_var *var) + { + char *ptr= (char*)(intptr)option.def_value; + var->save_result.string_value.str= ptr; + var->save_result.string_value.length= ptr ? strlen(ptr) : 0; + } +}; + +class Sys_var_charptr: public Sys_var_charptr_base +{ +public: + Sys_var_charptr(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + const char *def_val, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) : + Sys_var_charptr_base(name_arg, comment, flag_args, off, size, getopt, + def_val, lock, binlog_status_arg, + on_check_func, on_update_func, substitute) + { + SYSVAR_ASSERT(scope() == GLOBAL); + SYSVAR_ASSERT(size == sizeof(char *)); + } + + bool session_update(THD *thd, set_var *var) + { + DBUG_ASSERT(FALSE); + return true; + } + void session_save_default(THD *thd, set_var *var) + { DBUG_ASSERT(FALSE); } +}; + + +class Sys_var_charptr_fscs: public Sys_var_charptr +{ + using Sys_var_charptr::Sys_var_charptr; +public: + CHARSET_INFO *charset(THD *thd) const override + { + return thd->variables.character_set_filesystem; + } +}; + + +#ifndef EMBEDDED_LIBRARY +class Sys_var_sesvartrack: public Sys_var_charptr_base +{ +public: + Sys_var_sesvartrack(const char *name_arg, + const char *comment, + CMD_LINE getopt, + const char *def_val, PolyLock *lock= 0) : + Sys_var_charptr_base(name_arg, comment, + SESSION_VAR(session_track_system_variables), + getopt, def_val, lock, + VARIABLE_NOT_IN_BINLOG, 0, 0, 0) + {} + bool do_check(THD *thd, set_var *var) + { + if (Sys_var_charptr_base::do_check(thd, var) || + sysvartrack_validate_value(thd, var->save_result.string_value.str, + var->save_result.string_value.length)) + return TRUE; + return FALSE; + } + bool global_update(THD *thd, set_var *var) + { + char *new_val= global_update_prepare(thd, var); + if (new_val) + { + if (sysvartrack_global_update(thd, new_val, + var->save_result.string_value.length)) + new_val= 0; + } + global_update_finish(new_val); + return (new_val == 0 && var->save_result.string_value.str != 0); + } + bool session_update(THD *thd, set_var *var) + { return thd->session_tracker.sysvars.update(thd, var); } + void session_save_default(THD *thd, set_var *var) + { + var->save_result.string_value.str= global_var(char*); + var->save_result.string_value.length= + strlen(var->save_result.string_value.str); + /* parse and feel list with default values */ + if (thd) + { +#ifdef DBUG_ASSERT_EXISTS + bool res= +#endif + sysvartrack_validate_value(thd, + var->save_result.string_value.str, + var->save_result.string_value.length); + DBUG_ASSERT(res == 0); + } + } +}; +#endif //EMBEDDED_LIBRARY + + +class Sys_var_proxy_user: public sys_var +{ +public: + Sys_var_proxy_user(const char *name_arg, const char *comment) + : sys_var(&all_sys_vars, name_arg, comment, + sys_var::READONLY+sys_var::ONLY_SESSION, 0, NO_GETOPT, + NO_ARG, SHOW_CHAR, 0, NULL, VARIABLE_NOT_IN_BINLOG, + NULL, NULL, NULL) + { + option.var_type|= GET_STR; + } + bool do_check(THD *thd, set_var *var) + { + DBUG_ASSERT(FALSE); + return true; + } + bool session_update(THD *thd, set_var *var) + { + DBUG_ASSERT(FALSE); + return true; + } + bool global_update(THD *thd, set_var *var) + { + DBUG_ASSERT(FALSE); + return false; + } + void session_save_default(THD *thd, set_var *var) + { DBUG_ASSERT(FALSE); } + void global_save_default(THD *thd, set_var *var) + { DBUG_ASSERT(FALSE); } +protected: + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + return thd->security_ctx->proxy_user[0] ? + (uchar *) &(thd->security_ctx->proxy_user[0]) : NULL; + } +}; + +class Sys_var_external_user : public Sys_var_proxy_user +{ +public: + Sys_var_external_user(const char *name_arg, const char *comment_arg) + : Sys_var_proxy_user (name_arg, comment_arg) + {} + +protected: + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + return (uchar*)thd->security_ctx->external_user; + } +}; + +class Master_info; +class Sys_var_rpl_filter: public sys_var +{ +private: + int opt_id; + privilege_t m_access_global; + +public: + Sys_var_rpl_filter(const char *name, int getopt_id, const char *comment, + privilege_t access_global) + : sys_var(&all_sys_vars, name, comment, sys_var::GLOBAL, 0, NO_GETOPT, + NO_ARG, SHOW_CHAR, 0, NULL, VARIABLE_NOT_IN_BINLOG, + NULL, NULL, NULL), opt_id(getopt_id), + m_access_global(access_global) + { + option.var_type|= GET_STR | GET_ASK_ADDR; + } + + bool do_check(THD *thd, set_var *var) override + { + return Sys_var_charptr::do_string_check(thd, var, charset(thd)); + } + void session_save_default(THD *, set_var *) override + { DBUG_ASSERT(FALSE); } + + void global_save_default(THD *thd, set_var *var) override + { + char *ptr= (char*)(intptr)option.def_value; + var->save_result.string_value.str= ptr; + var->save_result.string_value.length= ptr ? strlen(ptr) : 0; + } + + bool session_update(THD *, set_var *) override + { + DBUG_ASSERT(FALSE); + return true; + } + + bool global_update(THD *thd, set_var *var) override; + + bool on_check_access_global(THD *thd) const override + { + return check_global_access(thd, m_access_global); + } + +protected: + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) + const override; + bool set_filter_value(const char *value, Master_info *mi); +}; + +/** + The class for string variables. Useful for strings that aren't necessarily + \0-terminated. Otherwise the same as Sys_var_charptr. + + Backing store: LEX_CSTRING + + @note + Behaves exactly as Sys_var_charptr, only the backing store is different. +*/ +class Sys_var_lexstring: public Sys_var_charptr +{ +public: + Sys_var_lexstring(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + const char *def_val, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : Sys_var_charptr(name_arg, comment, flag_args, off, sizeof(char*), + getopt, def_val, lock, binlog_status_arg, + on_check_func, on_update_func, substitute) + { + global_var(LEX_CSTRING).length= strlen(def_val); + SYSVAR_ASSERT(size == sizeof(LEX_CSTRING)); + *const_cast<SHOW_TYPE*>(&show_val_type)= SHOW_LEX_STRING; + } + bool global_update(THD *thd, set_var *var) + { + if (Sys_var_charptr::global_update(thd, var)) + return true; + global_var(LEX_CSTRING).length= var->save_result.string_value.length; + return false; + } +}; + + +/* + A LEX_CSTRING stored only in thd->variables + Only to be used for small buffers +*/ + +class Sys_var_session_lexstring: public sys_var +{ + size_t max_length; +public: + Sys_var_session_lexstring(const char *name_arg, + const char *comment, int flag_args, + ptrdiff_t off, size_t size, CMD_LINE getopt, + const char *def_val, size_t max_length_arg, + on_check_function on_check_func=0, + on_update_function on_update_func=0) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, off, getopt.id, + getopt.arg_type, SHOW_CHAR, (intptr)def_val, + 0, VARIABLE_NOT_IN_BINLOG, on_check_func, on_update_func, + 0),max_length(max_length_arg) + { + option.var_type|= GET_STR; + SYSVAR_ASSERT(scope() == ONLY_SESSION) + *const_cast<SHOW_TYPE*>(&show_val_type)= SHOW_LEX_STRING; + } + bool do_check(THD *thd, set_var *var) + { + char buff[STRING_BUFFER_USUAL_SIZE]; + String str(buff, sizeof(buff), system_charset_info), *res; + + if (!(res=var->value->val_str(&str))) + { + var->save_result.string_value.str= 0; /* NULL */ + var->save_result.string_value.length= 0; + } + else + { + if (res->length() > max_length) + { + my_error(ER_WRONG_STRING_LENGTH, MYF(0), + res->ptr(), name.str, (int) max_length); + return true; + } + var->save_result.string_value.str= thd->strmake(res->ptr(), + res->length()); + var->save_result.string_value.length= res->length(); + } + return false; + } + bool session_update(THD *thd, set_var *var) + { + LEX_CSTRING *tmp= &session_var(thd, LEX_CSTRING); + tmp->length= var->save_result.string_value.length; + /* Store as \0 terminated string (just to be safe) */ + strmake((char*) tmp->str, var->save_result.string_value.str, tmp->length); + return false; + } + bool global_update(THD *thd, set_var *var) + { + DBUG_ASSERT(FALSE); + return false; + } + void session_save_default(THD *thd, set_var *var) + { + char *ptr= (char*)(intptr)option.def_value; + var->save_result.string_value.str= ptr; + var->save_result.string_value.length= strlen(ptr); + } + void global_save_default(THD *thd, set_var *var) + { + DBUG_ASSERT(FALSE); + } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + DBUG_ASSERT(FALSE); + return NULL; + } +}; + + +#ifndef DBUG_OFF +/** + @@session.debug_dbug and @@global.debug_dbug variables. + + @@dbug variable differs from other variables in one aspect: + if its value is not assigned in the session, it "points" to the global + value, and so when the global value is changed, the change + immediately takes effect in the session. + + This semantics is intentional, to be able to debug one session from + another. +*/ +class Sys_var_dbug: public sys_var +{ +public: + Sys_var_dbug(const char *name_arg, + const char *comment, int flag_args, + CMD_LINE getopt, + const char *def_val, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, + (char*)¤t_dbug_option-(char*)&global_system_variables, getopt.id, + getopt.arg_type, SHOW_CHAR, (intptr)def_val, + lock, binlog_status_arg, on_check_func, on_update_func, + substitute) + { option.var_type|= GET_STR; } + bool do_check(THD *thd, set_var *var) + { + char buff[STRING_BUFFER_USUAL_SIZE]; + String str(buff, sizeof(buff), system_charset_info), *res; + + if (!(res=var->value->val_str(&str))) + { + var->save_result.string_value.str= const_cast<char*>(""); + var->save_result.string_value.length= 0; + } + else + { + size_t len= res->length(); + var->save_result.string_value.str= thd->strmake(res->ptr(), len); + var->save_result.string_value.length= len; + } + return false; + } + bool session_update(THD *thd, set_var *var) + { + const char *val= var->save_result.string_value.str; + if (!var->value) + DBUG_POP(); + else + DBUG_SET(val); + return false; + } + bool global_update(THD *thd, set_var *var) + { + const char *val= var->save_result.string_value.str; + DBUG_SET_INITIAL(val); + return false; + } + void session_save_default(THD *thd, set_var *var) + { } + void global_save_default(THD *thd, set_var *var) + { + char *ptr= (char*)(intptr)option.def_value; + var->save_result.string_value.str= ptr; + var->save_result.string_value.length= safe_strlen(ptr); + } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + char buf[256]; + DBUG_EXPLAIN(buf, sizeof(buf)); + return (uchar*) thd->strdup(buf); + } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + char buf[256]; + DBUG_EXPLAIN_INITIAL(buf, sizeof(buf)); + return (uchar*) thd->strdup(buf); + } + const uchar *default_value_ptr(THD *thd) const + { return (uchar*)""; } +}; +#endif + +#define KEYCACHE_VAR(X) GLOBAL_VAR(dflt_key_cache_var.X) +#define keycache_var_ptr(KC, OFF) (((uchar*)(KC))+(OFF)) +#define keycache_var(KC, OFF) (*(ulonglong*)keycache_var_ptr(KC, OFF)) +typedef bool (*keycache_update_function)(THD *, KEY_CACHE *, ptrdiff_t, ulonglong); + +/** + The class for keycache_* variables. Supports structured names, + keycache_name.variable_name. + + Class specific constructor arguments: + everything derived from Sys_var_ulonglong + + Backing store: ulonglong + + @note these variables can be only GLOBAL +*/ +class Sys_var_keycache: public Sys_var_ulonglong +{ + keycache_update_function keycache_update; +public: + Sys_var_keycache(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + ulonglong min_val, ulonglong max_val, ulonglong def_val, + uint block_size, PolyLock *lock, + enum binlog_status_enum binlog_status_arg, + on_check_function on_check_func, + keycache_update_function on_update_func, + const char *substitute=0) + : Sys_var_ulonglong(name_arg, comment, flag_args, off, size, + getopt, min_val, max_val, def_val, + block_size, lock, binlog_status_arg, on_check_func, 0, + substitute), + keycache_update(on_update_func) + { + option.var_type|= GET_ASK_ADDR; + option.value= (uchar**)1; // crash me, please + // fix an offset from global_system_variables to be an offset in KEY_CACHE + offset= global_var_ptr() - (uchar*)dflt_key_cache; + SYSVAR_ASSERT(scope() == GLOBAL); + } + bool global_update(THD *thd, set_var *var) + { + ulonglong new_value= var->save_result.ulonglong_value; + LEX_CSTRING *base_name= &var->base; + KEY_CACHE *key_cache; + + /* If no basename, assume it's for the key cache named 'default' */ + if (!base_name->length) + base_name= &default_key_cache_base; + + key_cache= get_key_cache(base_name); + + if (!key_cache) + { // Key cache didn't exists */ + if (!new_value) // Tried to delete cache + return false; // Ok, nothing to do + if (!(key_cache= create_key_cache(base_name->str, base_name->length))) + return true; + } + + /** + 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) + return true; + + return keycache_update(thd, key_cache, offset, new_value); + } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + KEY_CACHE *key_cache= get_key_cache(base); + if (!key_cache) + key_cache= &zero_key_cache; + return keycache_var_ptr(key_cache, offset); + } +}; + +static bool update_buffer_size(THD *thd, KEY_CACHE *key_cache, + ptrdiff_t offset, ulonglong new_value) +{ + bool error= false; + DBUG_ASSERT(offset == offsetof(KEY_CACHE, param_buff_size)); + + if (new_value == 0) + { + if (key_cache == dflt_key_cache) + { + my_error(ER_WARN_CANT_DROP_DEFAULT_KEYCACHE, MYF(0)); + return true; + } + + if (key_cache->key_cache_inited) // If initied + { + /* + Move tables using this key cache to the default key cache + and clear the old key cache. + */ + key_cache->in_init= 1; + mysql_mutex_unlock(&LOCK_global_system_variables); + key_cache->param_buff_size= 0; + ha_resize_key_cache(key_cache); + ha_change_key_cache(key_cache, dflt_key_cache); + /* + 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 + */ + mysql_mutex_lock(&LOCK_global_system_variables); + key_cache->in_init= 0; + } + return error; + } + + key_cache->param_buff_size= new_value; + + /* If key cache didn't exist initialize it, else resize it */ + key_cache->in_init= 1; + mysql_mutex_unlock(&LOCK_global_system_variables); + + if (!key_cache->key_cache_inited) + error= ha_init_key_cache(0, key_cache, 0); + else + error= ha_resize_key_cache(key_cache); + + mysql_mutex_lock(&LOCK_global_system_variables); + key_cache->in_init= 0; + + return error; +} + +static bool update_keycache(THD *thd, KEY_CACHE *key_cache, + ptrdiff_t offset, ulonglong new_value, + int (*func)(KEY_CACHE *)) +{ + bool error= false; + DBUG_ASSERT(offset != offsetof(KEY_CACHE, param_buff_size)); + + keycache_var(key_cache, offset)= new_value; + + key_cache->in_init= 1; + mysql_mutex_unlock(&LOCK_global_system_variables); + error= func(key_cache); + mysql_mutex_lock(&LOCK_global_system_variables); + key_cache->in_init= 0; + + return error; +} + +static bool resize_keycache(THD *thd, KEY_CACHE *key_cache, + ptrdiff_t offset, ulonglong new_value) +{ + return update_keycache(thd, key_cache, offset, new_value, + ha_resize_key_cache); +} + +static bool change_keycache_param(THD *thd, KEY_CACHE *key_cache, + ptrdiff_t offset, ulonglong new_value) +{ + return update_keycache(thd, key_cache, offset, new_value, + ha_change_key_cache_param); +} + +static bool repartition_keycache(THD *thd, KEY_CACHE *key_cache, + ptrdiff_t offset, ulonglong new_value) +{ + return update_keycache(thd, key_cache, offset, new_value, + ha_repartition_key_cache); +} + + +/** + The class for floating point variables + + Class specific constructor arguments: min, max + + Backing store: double +*/ +class Sys_var_double: public sys_var +{ +public: + Sys_var_double(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + double min_val, double max_val, double def_val, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, off, getopt.id, + getopt.arg_type, SHOW_DOUBLE, + (longlong) getopt_double2ulonglong(def_val), + lock, binlog_status_arg, on_check_func, on_update_func, + substitute) + { + option.var_type|= GET_DOUBLE; + option.min_value= (longlong) getopt_double2ulonglong(min_val); + option.max_value= (longlong) getopt_double2ulonglong(max_val); + global_var(double)= (double)option.def_value; + SYSVAR_ASSERT(min_val < max_val); + SYSVAR_ASSERT(min_val <= def_val); + SYSVAR_ASSERT(max_val >= def_val); + SYSVAR_ASSERT(size == sizeof(double)); + } + bool do_check(THD *thd, set_var *var) + { + my_bool fixed; + double v= var->value->val_real(); + var->save_result.double_value= getopt_double_limit_value(v, &option, &fixed); + + return throw_bounds_warning(thd, name.str, fixed, v); + } + bool session_update(THD *thd, set_var *var) + { + session_var(thd, double)= var->save_result.double_value; + return false; + } + bool global_update(THD *thd, set_var *var) + { + global_var(double)= var->save_result.double_value; + return false; + } + void session_save_default(THD *thd, set_var *var) + { var->save_result.double_value= global_var(double); } + void global_save_default(THD *thd, set_var *var) + { var->save_result.double_value= getopt_ulonglong2double(option.def_value); } +}; + +/** + The class for the @max_user_connections. + It's derived from Sys_var_uint, but non-standard session value + requires a new class. + + Class specific constructor arguments: + everything derived from Sys_var_uint + + Backing store: uint +*/ +class Sys_var_max_user_conn: public Sys_var_int +{ +public: + Sys_var_max_user_conn(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + int min_val, int max_val, int def_val, + uint block_size, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : Sys_var_int(name_arg, comment, SESSION, off, size, getopt, + min_val, max_val, def_val, block_size, + lock, binlog_status_arg, on_check_func, on_update_func, + substitute) + { } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + if (thd->user_connect && thd->user_connect->user_resources.user_conn) + return (uchar*) &(thd->user_connect->user_resources.user_conn); + return global_value_ptr(thd, base); + } +}; + +/** + The class for flagset variables - a variant of SET that allows in-place + editing (turning on/off individual bits). String representations looks like + a "flag=val,flag=val,...". Example: @@optimizer_switch + + Class specific constructor arguments: + char* values[] - 0-terminated list of strings of valid values + + Backing store: ulonglong + + @note + the last value in the values[] array should + *always* be the string "default". +*/ +class Sys_var_flagset: public Sys_var_typelib +{ +public: + Sys_var_flagset(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + const char *values[], ulonglong def_val, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : Sys_var_typelib(name_arg, comment, flag_args, off, getopt, + SHOW_CHAR, values, def_val, lock, + binlog_status_arg, on_check_func, on_update_func, + substitute) + { + option.var_type|= GET_FLAGSET; + global_var(ulonglong)= def_val; + SYSVAR_ASSERT(typelib.count > 1); + SYSVAR_ASSERT(typelib.count <= 65); + SYSVAR_ASSERT(def_val <= my_set_bits(typelib.count-1)); + SYSVAR_ASSERT(strcmp(values[typelib.count-1], "default") == 0); + SYSVAR_ASSERT(size == sizeof(ulonglong)); + } + bool do_check(THD *thd, set_var *var) + { + char buff[STRING_BUFFER_USUAL_SIZE]; + String str(buff, sizeof(buff), system_charset_info), *res; + ulonglong default_value, current_value; + if (var->type == OPT_GLOBAL) + { + default_value= option.def_value; + current_value= global_var(ulonglong); + } + else + { + default_value= global_var(ulonglong); + current_value= session_var(thd, ulonglong); + } + + if (var->value->result_type() == STRING_RESULT) + { + if (!(res=var->value->val_str(&str))) + return true; + else + { + char *error; + uint error_len; + + var->save_result.ulonglong_value= + find_set_from_flags(&typelib, + typelib.count, + current_value, + default_value, + res->ptr(), res->length(), + &error, &error_len); + if (unlikely(error)) + { + ErrConvString err(error, error_len, res->charset()); + my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), name.str, err.ptr()); + return true; + } + } + } + else + { + longlong tmp=var->value->val_int(); + if ((tmp < 0 && ! var->value->unsigned_flag) + || (ulonglong)tmp > my_set_bits(typelib.count)) + return true; + else + var->save_result.ulonglong_value= tmp; + } + + return false; + } + bool session_update(THD *thd, set_var *var) + { + session_var(thd, ulonglong)= var->save_result.ulonglong_value; + return false; + } + bool global_update(THD *thd, set_var *var) + { + global_var(ulonglong)= var->save_result.ulonglong_value; + return false; + } + void session_save_default(THD *thd, set_var *var) + { var->save_result.ulonglong_value= global_var(ulonglong); } + void global_save_default(THD *thd, set_var *var) + { var->save_result.ulonglong_value= option.def_value; } + const uchar *valptr(THD *thd, ulonglong val) const + { return (uchar*)flagset_to_string(thd, 0, val, typelib.type_names); } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return valptr(thd, session_var(thd, ulonglong)); } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return valptr(thd, global_var(ulonglong)); } + const uchar *default_value_ptr(THD *thd) const + { return valptr(thd, option.def_value); } +}; + +/** + The class for SET variables - variables taking zero or more values + from the given list. Example: @@sql_mode + + Class specific constructor arguments: + char* values[] - 0-terminated list of strings of valid values + + Backing store: ulonglong +*/ +class Sys_var_set: public Sys_var_typelib +{ +public: + Sys_var_set(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + const char *values[], ulonglong def_val, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : Sys_var_typelib(name_arg, comment, flag_args, off, getopt, + SHOW_CHAR, values, def_val, lock, + binlog_status_arg, on_check_func, on_update_func, + substitute) + { + option.var_type|= GET_SET; + option.min_value= 0; + option.max_value= ~0ULL; + global_var(ulonglong)= def_val; + if ((option.u_max_value= (uchar**)max_var_ptr())) + { + *((ulonglong*) option.u_max_value)= ~0ULL; + } + SYSVAR_ASSERT(typelib.count > 0); + SYSVAR_ASSERT(typelib.count <= 64); + SYSVAR_ASSERT(def_val <= my_set_bits(typelib.count)); + SYSVAR_ASSERT(size == sizeof(ulonglong)); + } + bool check_maximum(THD *thd, set_var *var, + const char *c_val, longlong i_val) + { + if (!max_var_ptr() || + (var->save_result.ulonglong_value & ~(get_max_var())) == 0) + return FALSE; + var->save_result.ulonglong_value&= get_max_var(); + + return c_val ? throw_bounds_warning(thd, name.str, c_val) : + throw_bounds_warning(thd, name.str, TRUE, + var->value->unsigned_flag, i_val); + } + bool do_check(THD *thd, set_var *var) + { + char buff[STRING_BUFFER_USUAL_SIZE]; + String str(buff, sizeof(buff), system_charset_info), *res; + + if (var->value->result_type() == STRING_RESULT) + { + char *error; + uint error_len; + bool not_used; + + if (!(res= var->value->val_str_ascii_revert_empty_string_is_null(thd, + &str))) + return true; + + var->save_result.ulonglong_value= + find_set(&typelib, res->ptr(), res->length(), NULL, + &error, &error_len, ¬_used); + /* + note, we only issue an error if error_len > 0. + That is even while empty (zero-length) values are considered + errors by find_set(), these errors are ignored here + */ + if (error_len) + { + ErrConvString err(error, error_len, res->charset()); + my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), name.str, err.ptr()); + return true; + } + return check_maximum(thd, var, res->ptr(), 0); + } + + longlong tmp=var->value->val_int(); + if ((tmp < 0 && ! var->value->unsigned_flag) + || (ulonglong)tmp > my_set_bits(typelib.count)) + return true; + + var->save_result.ulonglong_value= tmp; + return check_maximum(thd, var, 0, tmp); + } + bool session_update(THD *thd, set_var *var) + { + session_var(thd, ulonglong)= var->save_result.ulonglong_value; + return false; + } + bool global_update(THD *thd, set_var *var) + { + global_var(ulonglong)= var->save_result.ulonglong_value; + return false; + } + void session_save_default(THD *thd, set_var *var) + { var->save_result.ulonglong_value= global_var(ulonglong); } + void global_save_default(THD *thd, set_var *var) + { var->save_result.ulonglong_value= option.def_value; } + const uchar *valptr(THD *thd, ulonglong val) const + { return reinterpret_cast<const uchar*>(set_to_string(thd, 0, val, typelib.type_names)); } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return valptr(thd, session_var(thd, ulonglong)); } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return valptr(thd, global_var(ulonglong)); } + const uchar *default_value_ptr(THD *thd) const + { return valptr(thd, option.def_value); } + + ulonglong get_max_var() { return *((ulonglong*) max_var_ptr()); } +}; + +/** + The class for variables which value is a plugin. + Example: @@default_storage_engine + + Class specific constructor arguments: + int plugin_type_arg (for example MYSQL_STORAGE_ENGINE_PLUGIN) + + Backing store: plugin_ref + + @note + these variables don't support command-line equivalents, any such + command-line options should be added manually to my_long_options in mysqld.cc +*/ +class Sys_var_plugin: public sys_var +{ + int plugin_type; +public: + Sys_var_plugin(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + int plugin_type_arg, char **def_val, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, off, getopt.id, + getopt.arg_type, SHOW_CHAR, (intptr)def_val, + lock, binlog_status_arg, on_check_func, on_update_func, + substitute), + plugin_type(plugin_type_arg) + { + option.var_type|= GET_STR; + SYSVAR_ASSERT(size == sizeof(plugin_ref)); + SYSVAR_ASSERT(getopt.id < 0); // force NO_CMD_LINE + } + bool do_check(THD *thd, set_var *var) + { + char buff[STRING_BUFFER_USUAL_SIZE]; + String str(buff,sizeof(buff), system_charset_info), *res; + if (!(res=var->value->val_str(&str))) + var->save_result.plugin= NULL; + else + { + const LEX_CSTRING pname= { const_cast<char*>(res->ptr()), res->length() }; + plugin_ref plugin; + + // special code for storage engines (e.g. to handle historical aliases) + if (plugin_type == MYSQL_STORAGE_ENGINE_PLUGIN) + plugin= ha_resolve_by_name(thd, &pname, false); + else + plugin= my_plugin_lock_by_name(thd, &pname, plugin_type); + if (unlikely(!plugin)) + { + // historically different error code + if (plugin_type == MYSQL_STORAGE_ENGINE_PLUGIN) + { + ErrConvString err(res); + my_error(ER_UNKNOWN_STORAGE_ENGINE, MYF(0), err.ptr()); + } + return true; + } + var->save_result.plugin= plugin; + } + return false; + } + void do_update(plugin_ref *valptr, plugin_ref newval) + { + plugin_ref oldval= *valptr; + if (oldval != newval) + { + *valptr= newval ? my_plugin_lock(NULL, newval) : 0; + plugin_unlock(NULL, oldval); + } + } + bool session_update(THD *thd, set_var *var) + { + do_update((plugin_ref*)session_var_ptr(thd), + var->save_result.plugin); + return false; + } + bool global_update(THD *thd, set_var *var) + { + do_update((plugin_ref*)global_var_ptr(), + var->save_result.plugin); + return false; + } + void session_save_default(THD *thd, set_var *var) + { + plugin_ref plugin= global_var(plugin_ref); + var->save_result.plugin= plugin ? my_plugin_lock(thd, plugin) : 0; + } + plugin_ref get_default(THD *thd) const + { + char *default_value= *reinterpret_cast<char**>(option.def_value); + if (!default_value) + return 0; + + LEX_CSTRING pname= { default_value, strlen(default_value) }; + plugin_ref plugin; + + if (plugin_type == MYSQL_STORAGE_ENGINE_PLUGIN) + plugin= ha_resolve_by_name(thd, &pname, false); + else + plugin= my_plugin_lock_by_name(thd, &pname, plugin_type); + DBUG_ASSERT(plugin); + return my_plugin_lock(thd, plugin); + } + + void global_save_default(THD *thd, set_var *var) + { + var->save_result.plugin= get_default(thd); + } + + uchar *valptr(THD *thd, plugin_ref plugin) const + { + return (uchar*)(plugin ? thd->strmake(plugin_name(plugin)->str, + plugin_name(plugin)->length) : 0); + } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return valptr(thd, session_var(thd, plugin_ref)); } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return valptr(thd, global_var(plugin_ref)); } + const uchar *default_value_ptr(THD *thd) const + { return valptr(thd, get_default(thd)); } +}; + +/** + Class for variables that containg a list of plugins. + Currently this is used only for @@gtid_pos_auto_create_engines + + Backing store: plugin_ref + + @note + Currently this is only used for storage engine type plugins, and thus only + storage engine type plugin is implemented. It could be extended to other + plugin types later if needed, similar to Sys_var_plugin. + + These variables don't support command-line equivalents, any such + command-line options should be added manually to my_long_options in mysqld.cc + + Note on lifetimes of resources allocated: We allocate a zero-terminated array + of plugin_ref*, and lock the contained plugins. The list in the global + variable must be freed (with free_engine_list()). However, the way Sys_var + works, there is no place to explicitly free other lists, like the one + returned from get_default(). + + Therefore, the code needs to work with temporary lists, which are + registered in the THD to be automatically freed (and plugins similarly + automatically unlocked). This is why do_check() allocates a temporary + list, from which do_update() then makes a permanent copy. +*/ +class Sys_var_pluginlist: public sys_var +{ +public: + Sys_var_pluginlist(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + char **def_val, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, off, getopt.id, + getopt.arg_type, SHOW_CHAR, (intptr)def_val, + lock, binlog_status_arg, on_check_func, on_update_func, + substitute) + { + option.var_type|= GET_STR; + SYSVAR_ASSERT(size == sizeof(plugin_ref)); + SYSVAR_ASSERT(getopt.id < 0); // force NO_CMD_LINE + } + bool do_check(THD *thd, set_var *var) + { + char buff[STRING_BUFFER_USUAL_SIZE]; + String str(buff,sizeof(buff), system_charset_info), *res; + plugin_ref *plugins; + + if (!(res=var->value->val_str(&str))) + plugins= resolve_engine_list(thd, "", 0, true, true); + else + plugins= resolve_engine_list(thd, res->ptr(), res->length(), true, true); + if (!plugins) + return true; + var->save_result.plugins= plugins; + return false; + } + void do_update(plugin_ref **valptr, plugin_ref* newval) + { + plugin_ref *oldval= *valptr; + *valptr= copy_engine_list(newval); + free_engine_list(oldval); + } + bool session_update(THD *thd, set_var *var) + { + do_update((plugin_ref**)session_var_ptr(thd), + var->save_result.plugins); + return false; + } + bool global_update(THD *thd, set_var *var) + { + do_update((plugin_ref**)global_var_ptr(), + var->save_result.plugins); + return false; + } + void session_save_default(THD *thd, set_var *var) + { + plugin_ref* plugins= global_var(plugin_ref *); + var->save_result.plugins= plugins ? temp_copy_engine_list(thd, plugins) : 0; + } + plugin_ref *get_default(THD *thd) const + { + char *default_value= *reinterpret_cast<char**>(option.def_value); + if (!default_value) + return 0; + return resolve_engine_list(thd, default_value, strlen(default_value), + false, true); + } + + void global_save_default(THD *thd, set_var *var) + { + var->save_result.plugins= get_default(thd); + } + + uchar *valptr(THD *thd, plugin_ref *plugins) const + { + return reinterpret_cast<uchar*>(pretty_print_engine_list(thd, plugins)); + } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return valptr(thd, session_var(thd, plugin_ref*)); } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return valptr(thd, global_var(plugin_ref*)); } + const uchar *default_value_ptr(THD *thd) const + { return valptr(thd, get_default(thd)); } +}; + +#if defined(ENABLED_DEBUG_SYNC) + +#include "debug_sync.h" + +/** + The class for @@debug_sync session-only variable +*/ +class Sys_var_debug_sync :public sys_var +{ +public: + Sys_var_debug_sync(const char *name_arg, + const char *comment, int flag_args, + CMD_LINE getopt, + const char *def_val, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, 0, getopt.id, + getopt.arg_type, SHOW_CHAR, (intptr)def_val, + lock, binlog_status_arg, on_check_func, on_update_func, + substitute) + { + SYSVAR_ASSERT(scope() == ONLY_SESSION); + option.var_type|= GET_STR; + } + bool do_check(THD *thd, set_var *var) + { + char buff[STRING_BUFFER_USUAL_SIZE]; + String str(buff, sizeof(buff), system_charset_info), *res; + + if (!(res=var->value->val_str(&str))) + var->save_result.string_value= empty_lex_str; + else + { + if (!thd->make_lex_string(&var->save_result.string_value, + res->ptr(), res->length())) + return true; + } + return false; + } + bool session_update(THD *thd, set_var *var) + { + return debug_sync_update(thd, var->save_result.string_value.str, + var->save_result.string_value.length); + } + bool global_update(THD *thd, set_var *var) + { + DBUG_ASSERT(FALSE); + return true; + } + void session_save_default(THD *thd, set_var *var) + { + var->save_result.string_value.str= const_cast<char*>(""); + var->save_result.string_value.length= 0; + } + void global_save_default(THD *thd, set_var *var) + { + DBUG_ASSERT(FALSE); + } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + return debug_sync_value_ptr(thd); + } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + DBUG_ASSERT(FALSE); + return 0; + } + const uchar *default_value_ptr(THD *thd) const + { return (uchar*)""; } +}; +#endif /* defined(ENABLED_DEBUG_SYNC) */ + + +/** + The class for bit variables - a variant of boolean that stores the value + in a bit. + + Class specific constructor arguments: + ulonglong bitmask_arg - the mask for the bit to set in the ulonglong + backing store + + Backing store: ulonglong + + @note + This class supports the "reverse" semantics, when the value of the bit + being 0 corresponds to the value of variable being set. To activate it + use REVERSE(bitmask) instead of simply bitmask in the constructor. + + @note + variables of this class cannot be set from the command line as + my_getopt does not support bits. +*/ +class Sys_var_bit: public Sys_var_typelib +{ + ulonglong bitmask; + bool reverse_semantics; + void set(uchar *ptr, ulonglong value) + { + if ((value != 0) ^ reverse_semantics) + (*(ulonglong *)ptr)|= bitmask; + else + (*(ulonglong *)ptr)&= ~bitmask; + } +public: + Sys_var_bit(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + ulonglong bitmask_arg, my_bool def_val, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : Sys_var_typelib(name_arg, comment, flag_args, off, getopt, + SHOW_MY_BOOL, bool_values, def_val, lock, + binlog_status_arg, on_check_func, on_update_func, + substitute) + { + option.var_type|= GET_BIT; + reverse_semantics= my_count_bits(bitmask_arg) > 1; + bitmask= reverse_semantics ? ~bitmask_arg : bitmask_arg; + option.block_size= reverse_semantics ? -(long) bitmask : (long)bitmask; + set(global_var_ptr(), def_val); + SYSVAR_ASSERT(def_val < 2); + SYSVAR_ASSERT(size == sizeof(ulonglong)); + } + bool session_update(THD *thd, set_var *var) + { + set(session_var_ptr(thd), var->save_result.ulonglong_value); + return false; + } + bool global_update(THD *thd, set_var *var) + { + set(global_var_ptr(), var->save_result.ulonglong_value); + return false; + } + void session_save_default(THD *thd, set_var *var) + { + var->save_result.ulonglong_value= + (reverse_semantics == !(global_var(ulonglong) & bitmask)); + } + void global_save_default(THD *thd, set_var *var) + { var->save_result.ulonglong_value= option.def_value; } + + uchar *valptr(THD *thd, ulonglong val) const + { + thd->sys_var_tmp.my_bool_value= (reverse_semantics == !(val & bitmask)); + return (uchar*) &thd->sys_var_tmp.my_bool_value; + } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return valptr(thd, session_var(thd, ulonglong)); } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return valptr(thd, global_var(ulonglong)); } + const uchar *default_value_ptr(THD *thd) const + { + thd->sys_var_tmp.my_bool_value= option.def_value != 0; + return (uchar*) &thd->sys_var_tmp.my_bool_value; + } +}; + +/** + The class for variables that have a special meaning for a session, + such as @@timestamp or @@rnd_seed1, their values typically cannot be read + from SV structure, and a special "read" callback is provided. + + Class specific constructor arguments: + everything derived from Sys_var_ulonglong + session_special_read_function read_func_arg + + Backing store: ulonglong + + @note + These variables are session-only, global or command-line equivalents + are not supported as they're generally meaningless. +*/ +class Sys_var_session_special: public Sys_var_ulonglong +{ + typedef bool (*session_special_update_function)(THD *thd, set_var *var); + typedef ulonglong (*session_special_read_function)(THD *thd); + + session_special_read_function read_func; + session_special_update_function update_func; +public: + Sys_var_session_special(const char *name_arg, + const char *comment, int flag_args, + CMD_LINE getopt, + ulonglong min_val, ulonglong max_val, uint block_size, + PolyLock *lock, enum binlog_status_enum binlog_status_arg, + on_check_function on_check_func, + session_special_update_function update_func_arg, + session_special_read_function read_func_arg, + const char *substitute=0) + : Sys_var_ulonglong(name_arg, comment, flag_args, 0, + sizeof(ulonglong), getopt, min_val, + max_val, 0, block_size, lock, binlog_status_arg, on_check_func, 0, + substitute), + read_func(read_func_arg), update_func(update_func_arg) + { + SYSVAR_ASSERT(scope() == ONLY_SESSION); + SYSVAR_ASSERT(getopt.id < 0); // NO_CMD_LINE, because the offset is fake + } + bool session_update(THD *thd, set_var *var) + { return update_func(thd, var); } + bool global_update(THD *thd, set_var *var) + { + DBUG_ASSERT(FALSE); + return true; + } + void session_save_default(THD *thd, set_var *var) + { var->value= 0; } + void global_save_default(THD *thd, set_var *var) + { DBUG_ASSERT(FALSE); } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + thd->sys_var_tmp.ulonglong_value= read_func(thd); + return (uchar*) &thd->sys_var_tmp.ulonglong_value; + } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + DBUG_ASSERT(FALSE); + return 0; + } + const uchar *default_value_ptr(THD *thd) const + { + thd->sys_var_tmp.ulonglong_value= 0; + return (uchar*) &thd->sys_var_tmp.ulonglong_value; + } +}; + + +/* + Dedicated class because of a weird behavior of a default value. + Assigning timestamp to itself + + SET @@timestamp = @@timestamp + + make it non-default and stops the time flow. +*/ +class Sys_var_timestamp: public Sys_var_double +{ +public: + Sys_var_timestamp(const char *name_arg, + const char *comment, int flag_args, + CMD_LINE getopt, + double min_val, double max_val, + PolyLock *lock, enum binlog_status_enum binlog_status_arg, + on_check_function on_check_func=0) + : Sys_var_double(name_arg, comment, flag_args, 0, + sizeof(double), getopt, min_val, + max_val, 0, lock, binlog_status_arg, on_check_func) + { + SYSVAR_ASSERT(scope() == ONLY_SESSION); + SYSVAR_ASSERT(getopt.id < 0); // NO_CMD_LINE, because the offset is fake + } + bool session_update(THD *thd, set_var *var) + { + if (var->value) + { + my_hrtime_t hrtime = { hrtime_from_time(var->save_result.double_value) }; + thd->set_time(hrtime); + } + else // SET timestamp=DEFAULT + thd->user_time.val= 0; + return false; + } + bool global_update(THD *thd, set_var *var) + { + DBUG_ASSERT(FALSE); + return true; + } + bool session_is_default(THD *thd) + { + return thd->user_time.val == 0; + } + void session_save_default(THD *thd, set_var *var) + { var->value= 0; } + void global_save_default(THD *thd, set_var *var) + { DBUG_ASSERT(FALSE); } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + thd->sys_var_tmp.double_value= thd->start_time + + thd->start_time_sec_part/(double)TIME_SECOND_PART_FACTOR; + return (uchar*) &thd->sys_var_tmp.double_value; + } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + DBUG_ASSERT(FALSE); + return 0; + } + const uchar *default_value_ptr(THD *thd) const + { + thd->sys_var_tmp.double_value= 0; + return (uchar*) &thd->sys_var_tmp.double_value; + } + bool on_check_access_session(THD *thd) const; +}; + + +/** + The class for read-only variables that show whether a particular + feature is supported by the server. Example: have_compression + + Backing store: enum SHOW_COMP_OPTION + + @note + These variables are necessarily read-only, only global, and have no + command-line equivalent. +*/ +class Sys_var_have: public sys_var +{ +public: + Sys_var_have(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, off, getopt.id, + getopt.arg_type, SHOW_CHAR, 0, + lock, binlog_status_arg, on_check_func, on_update_func, + substitute) + { + SYSVAR_ASSERT(scope() == GLOBAL); + SYSVAR_ASSERT(getopt.id < 0); + SYSVAR_ASSERT(lock == 0); + SYSVAR_ASSERT(binlog_status_arg == VARIABLE_NOT_IN_BINLOG); + SYSVAR_ASSERT(is_readonly()); + SYSVAR_ASSERT(on_update == 0); + SYSVAR_ASSERT(size == sizeof(enum SHOW_COMP_OPTION)); + option.var_type|= GET_STR; + } + bool do_check(THD *thd, set_var *var) { + DBUG_ASSERT(FALSE); + return true; + } + bool session_update(THD *thd, set_var *var) + { + DBUG_ASSERT(FALSE); + return true; + } + bool global_update(THD *thd, set_var *var) + { + DBUG_ASSERT(FALSE); + return true; + } + void session_save_default(THD *thd, set_var *var) { } + void global_save_default(THD *thd, set_var *var) { } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + DBUG_ASSERT(FALSE); + return 0; + } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + return (uchar*)show_comp_option_name[global_var(enum SHOW_COMP_OPTION)]; + } +}; + +/** + Generic class for variables for storing entities that are internally + represented as structures, have names, and possibly can be referred to by + numbers. Examples: character sets, collations, locales, + + Class specific constructor arguments: + ptrdiff_t name_offset - offset of the 'name' field in the structure + + Backing store: void* + + @note + As every such a structure requires special treatment from my_getopt, + these variables don't support command-line equivalents, any such + command-line options should be added manually to my_long_options in mysqld.cc +*/ +class Sys_var_struct: public sys_var +{ + ptrdiff_t name_offset; // offset to the 'name' property in the structure +public: + Sys_var_struct(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + ptrdiff_t name_off, void *def_val, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, off, getopt.id, + getopt.arg_type, SHOW_CHAR, (intptr)def_val, + lock, binlog_status_arg, on_check_func, on_update_func, + substitute), + name_offset(name_off) + { + option.var_type|= GET_ENUM; // because we accept INT and STRING here + /* + struct variables are special on the command line - often (e.g. for + charsets) the name cannot be immediately resolved, but only after all + options (in particular, basedir) are parsed. + + thus all struct command-line options should be added manually + to my_long_options in mysqld.cc + */ + SYSVAR_ASSERT(getopt.id < 0); + SYSVAR_ASSERT(size == sizeof(void *)); + } + bool do_check(THD *thd, set_var *var) + { return false; } + bool session_update(THD *thd, set_var *var) + { + session_var(thd, const void*)= var->save_result.ptr; + return false; + } + bool global_update(THD *thd, set_var *var) + { + global_var(const void*)= var->save_result.ptr; + return false; + } + void session_save_default(THD *thd, set_var *var) + { var->save_result.ptr= global_var(void*); } + void global_save_default(THD *thd, set_var *var) + { + void **default_value= reinterpret_cast<void**>(option.def_value); + var->save_result.ptr= *default_value; + } + uchar *valptr(THD *thd, uchar *val) const + { return val ? *(uchar**)(val+name_offset) : 0; } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return valptr(thd, session_var(thd, uchar*)); } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return valptr(thd, global_var(uchar*)); } + const uchar *default_value_ptr(THD *thd) const + { return valptr(thd, *(uchar**)option.def_value); } +}; + +/** + The class for variables that store time zones + + Backing store: Time_zone* + + @note + Time zones cannot be supported directly by my_getopt, thus + these variables don't support command-line equivalents, any such + command-line options should be added manually to my_long_options in mysqld.cc +*/ +class Sys_var_tz: public sys_var +{ +public: + Sys_var_tz(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + Time_zone **def_val, PolyLock *lock=0, + enum binlog_status_enum binlog_status_arg=VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func=0, + on_update_function on_update_func=0, + const char *substitute=0) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, off, getopt.id, + getopt.arg_type, SHOW_CHAR, (intptr)def_val, + lock, binlog_status_arg, on_check_func, on_update_func, + substitute) + { + SYSVAR_ASSERT(getopt.id < 0); + SYSVAR_ASSERT(size == sizeof(Time_zone *)); + option.var_type|= GET_STR; + } + bool do_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); + + if (!res) + return true; + + if (!(var->save_result.time_zone= my_tz_find(thd, res))) + { + ErrConvString err(res); + my_error(ER_UNKNOWN_TIME_ZONE, MYF(0), err.ptr()); + return true; + } + return false; + } + bool session_update(THD *thd, set_var *var) + { + session_var(thd, Time_zone*)= var->save_result.time_zone; + return false; + } + bool global_update(THD *thd, set_var *var) + { + global_var(Time_zone*)= var->save_result.time_zone; + return false; + } + void session_save_default(THD *thd, set_var *var) + { + var->save_result.time_zone= global_var(Time_zone*); + } + void global_save_default(THD *thd, set_var *var) + { + var->save_result.time_zone= + *(Time_zone**)(intptr)option.def_value; + } + const uchar *valptr(THD *thd, Time_zone *val) const + { return reinterpret_cast<const uchar*>(val->get_name()->ptr()); } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + /* + This is an ugly fix for replication: we don't replicate properly queries + invoking system variables' values to update tables; but + CONVERT_TZ(,,@@session.time_zone) is so popular that we make it + replicable (i.e. we tell the binlog code to store the session + timezone). If it's the global value which was used we can't replicate + (binlog code stores session value only). + */ + thd->time_zone_used= 1; + return valptr(thd, session_var(thd, Time_zone *)); + } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return valptr(thd, global_var(Time_zone*)); } + const uchar *default_value_ptr(THD *thd) const + { return valptr(thd, *(Time_zone**)option.def_value); } +}; + +/** + Special implementation for transaction isolation, that + distingushes between + + SET GLOBAL TRANSACTION ISOLATION (stored in global_system_variables) + SET SESSION TRANSACTION ISOLATION (stored in thd->variables) + SET TRANSACTION ISOLATION (stored in thd->tx_isolation) + + where the last statement sets isolation level for the next transaction only +*/ +class Sys_var_tx_isolation: public Sys_var_enum +{ +public: + Sys_var_tx_isolation(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + const char *values[], uint def_val, PolyLock *lock, + enum binlog_status_enum binlog_status_arg, + on_check_function on_check_func) + :Sys_var_enum(name_arg, comment, flag_args, off, size, getopt, + values, def_val, lock, binlog_status_arg, on_check_func) + {} + bool session_update(THD *thd, set_var *var) + { + if (var->type == OPT_SESSION && Sys_var_enum::session_update(thd, var)) + return TRUE; + if (var->type == OPT_DEFAULT || !thd->in_active_multi_stmt_transaction()) + { + thd->tx_isolation= (enum_tx_isolation) var->save_result.ulonglong_value; + +#ifndef EMBEDDED_LIBRARY + if (var->type == OPT_DEFAULT) + { + enum enum_tx_isol_level l; + switch (thd->tx_isolation) { + case ISO_READ_UNCOMMITTED: + l= TX_ISOL_UNCOMMITTED; + break; + case ISO_READ_COMMITTED: + l= TX_ISOL_COMMITTED; + break; + case ISO_REPEATABLE_READ: + l= TX_ISOL_REPEATABLE; + break; + case ISO_SERIALIZABLE: + l= TX_ISOL_SERIALIZABLE; + break; + default: + DBUG_ASSERT(0); + return TRUE; + } + if (thd->variables.session_track_transaction_info > TX_TRACK_NONE) + thd->session_tracker.transaction_info.set_isol_level(thd, l); + } + else if (thd->variables.session_track_transaction_info > TX_TRACK_NONE) + thd->session_tracker.transaction_info.set_isol_level(thd, TX_ISOL_INHERIT); +#endif //EMBEDDED_LIBRARY + } + return FALSE; + } +}; + + +/** + Class representing the tx_read_only system variable for setting + default transaction access mode. + + Note that there is a special syntax - SET TRANSACTION READ ONLY + (or READ WRITE) that sets the access mode for the next transaction + only. +*/ + +class Sys_var_tx_read_only: public Sys_var_mybool +{ +public: + Sys_var_tx_read_only(const char *name_arg, const char *comment, int flag_args, + ptrdiff_t off, size_t size, CMD_LINE getopt, + my_bool def_val, PolyLock *lock, + enum binlog_status_enum binlog_status_arg, + on_check_function on_check_func) + :Sys_var_mybool(name_arg, comment, flag_args, off, size, getopt, + def_val, lock, binlog_status_arg, on_check_func) + {} + virtual bool session_update(THD *thd, set_var *var); +}; + +/* + Class for replicate_events_marked_for_skip. + We need a custom update function that ensures the slave is stopped when + the update is happening. +*/ +class Sys_var_replicate_events_marked_for_skip: public Sys_var_enum +{ +public: + Sys_var_replicate_events_marked_for_skip(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, + const char *values[], uint def_val, PolyLock *lock= 0, + enum binlog_status_enum binlog_status_arg= VARIABLE_NOT_IN_BINLOG) + :Sys_var_enum(name_arg, comment, flag_args, off, size, getopt, + values, def_val, lock, binlog_status_arg) + {} + bool global_update(THD *thd, set_var *var); +}; + +/* + Class for handing multi-source replication variables + Variable values are store in Master_info, but to make it possible to + access variable without locks we also store it thd->variables. + These can be used as GLOBAL or SESSION, but both points to the same + variable. This is to make things compatible with MySQL 5.5 where variables + like sql_slave_skip_counter are GLOBAL. +*/ + +#define MASTER_INFO_VAR(X) my_offsetof(Master_info, X), sizeof(((Master_info *)0x10)->X) +class Sys_var_multi_source_ulonglong; +class Master_info; + +typedef bool (*on_multi_source_update_function)(sys_var *self, THD *thd, + Master_info *mi); +bool update_multi_source_variable(sys_var *self, + THD *thd, enum_var_type type); + + +class Sys_var_multi_source_ulonglong :public Sys_var_ulonglong +{ + ptrdiff_t master_info_offset; + on_multi_source_update_function update_multi_source_variable_func; +public: + Sys_var_multi_source_ulonglong(const char *name_arg, + const char *comment, int flag_args, + ptrdiff_t off, size_t size, + CMD_LINE getopt, + ptrdiff_t master_info_offset_arg, + size_t master_info_arg_size, + ulonglong min_val, ulonglong max_val, + ulonglong def_val, uint block_size, + on_multi_source_update_function on_update_func) + :Sys_var_ulonglong(name_arg, comment, flag_args, off, size, + getopt, min_val, max_val, def_val, block_size, + 0, VARIABLE_NOT_IN_BINLOG, 0, update_multi_source_variable), + master_info_offset(master_info_offset_arg), + update_multi_source_variable_func(on_update_func) + { + SYSVAR_ASSERT(master_info_arg_size == size); + } + bool global_update(THD *thd, set_var *var) + { + return session_update(thd, var); + } + void session_save_default(THD *thd, set_var *var) + { + /* Use value given in variable declaration */ + global_save_default(thd, var); + } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + ulonglong *tmp, res; + tmp= (ulonglong*) (((uchar*)&(thd->variables)) + offset); + res= get_master_info_ulonglong_value(thd, master_info_offset); + *tmp= res; + return (uchar*) tmp; + } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + return session_value_ptr(thd, base); + } + ulonglong get_master_info_ulonglong_value(THD *thd, ptrdiff_t offset) const; + bool update_variable(THD *thd, Master_info *mi) + { + return update_multi_source_variable_func(this, thd, mi); + } +}; + + +/** + Class for @@global.gtid_current_pos. +*/ +class Sys_var_gtid_current_pos: public sys_var +{ +public: + Sys_var_gtid_current_pos(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, off, getopt.id, + getopt.arg_type, SHOW_CHAR, 0, NULL, VARIABLE_NOT_IN_BINLOG, + NULL, NULL, NULL) + { + SYSVAR_ASSERT(getopt.id < 0); + SYSVAR_ASSERT(is_readonly()); + option.var_type|= GET_STR; + } + bool do_check(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + return true; + } + bool session_update(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + return true; + } + bool global_update(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + return true; + } + void session_save_default(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + } + void global_save_default(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + DBUG_ASSERT(false); + return NULL; + } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const; +}; + + +/** + Class for @@global.gtid_binlog_pos. +*/ +class Sys_var_gtid_binlog_pos: public sys_var +{ +public: + Sys_var_gtid_binlog_pos(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, off, getopt.id, + getopt.arg_type, SHOW_CHAR, 0, NULL, VARIABLE_NOT_IN_BINLOG, + NULL, NULL, NULL) + { + SYSVAR_ASSERT(getopt.id < 0); + SYSVAR_ASSERT(is_readonly()); + option.var_type|= GET_STR; + } + bool do_check(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + return true; + } + bool session_update(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + return true; + } + bool global_update(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + return true; + } + void session_save_default(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + } + void global_save_default(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + DBUG_ASSERT(false); + return NULL; + } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const; +}; + + +/** + Class for @@global.gtid_slave_pos. +*/ +class Sys_var_gtid_slave_pos: public sys_var +{ +public: + Sys_var_gtid_slave_pos(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, off, getopt.id, + getopt.arg_type, SHOW_CHAR, 0, NULL, VARIABLE_NOT_IN_BINLOG, + NULL, NULL, NULL) + { + option.var_type|= GET_STR; + } + bool do_check(THD *thd, set_var *var); + bool session_update(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + return true; + } + bool global_update(THD *thd, set_var *var); + void session_save_default(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + } + void global_save_default(THD *thd, set_var *var) + { + /* Record the attempt to use default so we can error. */ + var->value= 0; + } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + DBUG_ASSERT(false); + return NULL; + } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const; + const uchar *default_value_ptr(THD *thd) const + { return 0; } + bool on_check_access_global(THD *thd) const + { + return check_global_access(thd, PRIV_SET_SYSTEM_GLOBAL_VAR_GTID_SLAVE_POS); + } +}; + + +/** + Class for @@global.gtid_binlog_state. +*/ +class Sys_var_gtid_binlog_state: public sys_var +{ +public: + Sys_var_gtid_binlog_state(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, off, getopt.id, + getopt.arg_type, SHOW_CHAR, 0, NULL, VARIABLE_NOT_IN_BINLOG, + NULL, NULL, NULL) + { + option.var_type|= GET_STR; + } + bool do_check(THD *thd, set_var *var); + bool session_update(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + return true; + } + bool global_update(THD *thd, set_var *var); + void session_save_default(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + } + void global_save_default(THD *thd, set_var *var) + { + /* Record the attempt to use default so we can error. */ + var->value= 0; + } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + DBUG_ASSERT(false); + return NULL; + } + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const; + const uchar *default_value_ptr(THD *thd) const + { return 0; } + bool on_check_access_global(THD *thd) const + { + return + check_global_access(thd, PRIV_SET_SYSTEM_GLOBAL_VAR_GTID_BINLOG_STATE); + } +}; + + +/** + Class for @@session.last_gtid. +*/ +class Sys_var_last_gtid: public sys_var +{ +public: + Sys_var_last_gtid(const char *name_arg, + const char *comment, int flag_args, CMD_LINE getopt) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, 0, getopt.id, + getopt.arg_type, SHOW_CHAR, 0, NULL, VARIABLE_NOT_IN_BINLOG, + NULL, NULL, NULL) + { + SYSVAR_ASSERT(getopt.id < 0); + SYSVAR_ASSERT(is_readonly()); + option.var_type|= GET_STR; + } + bool do_check(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + return true; + } + bool session_update(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + return true; + } + bool global_update(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + return true; + } + void session_save_default(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + } + void global_save_default(THD *thd, set_var *var) + { + DBUG_ASSERT(false); + } + const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const; + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { + DBUG_ASSERT(false); + return NULL; + } +}; + + +/** + Class for connection_name.slave_parallel_mode. +*/ +class Sys_var_slave_parallel_mode: public Sys_var_enum +{ +public: + Sys_var_slave_parallel_mode(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, const char *values[], + enum_slave_parallel_mode def_val) + : Sys_var_enum(name_arg, comment, flag_args, off, size, + getopt, values, def_val) + { + option.var_type|= GET_ASK_ADDR; + option.value= (uchar**)1; // crash me, please + SYSVAR_ASSERT(scope() == GLOBAL); + } + bool global_update(THD *thd, set_var *var); + const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const; +}; + + +class Sys_var_vers_asof: public sys_var +{ +public: + Sys_var_vers_asof(const char *name_arg, + const char *comment, int flag_args, ptrdiff_t off, size_t size, + CMD_LINE getopt, uint def_val, + PolyLock *lock= NO_MUTEX_GUARD, + binlog_status_enum binlog_status_arg= VARIABLE_NOT_IN_BINLOG, + on_check_function on_check_func= NULL, + on_update_function on_update_func= NULL, + const char *substitute= NULL) + : sys_var(&all_sys_vars, name_arg, comment, flag_args, off, + getopt.id, getopt.arg_type, SHOW_CHAR, def_val, lock, + binlog_status_arg, on_check_func, on_update_func, substitute) + { + option.var_type= GET_STR; + } + virtual bool do_check(THD *thd, set_var *var) + { + if (!var->value) + return false; + + MYSQL_TIME ltime; + Datetime::Options opt(TIME_CONV_NONE | + TIME_NO_ZERO_IN_DATE | + TIME_NO_ZERO_DATE, thd); + bool res= var->value->get_date(thd, <ime, opt); + if (!res) + { + uint error; + var->save_result.timestamp.unix_time= + thd->variables.time_zone->TIME_to_gmt_sec(<ime, &error); + var->save_result.timestamp.second_part= ltime.second_part; + res= error != 0; + } + return res; + } + +private: + static bool update(THD *thd, set_var *var, vers_asof_timestamp_t *out) + { + if (var->value) + { + out->type = SYSTEM_TIME_AS_OF; + out->unix_time = var->save_result.timestamp.unix_time; + out->second_part= var->save_result.timestamp.second_part; + } + return 0; + } + + static void save_default(set_var *var, vers_asof_timestamp_t *out) + { + out->type= SYSTEM_TIME_UNSPECIFIED; + } + +public: + virtual bool global_update(THD *thd, set_var *var) + { + return update(thd, var, &global_var(vers_asof_timestamp_t)); + } + virtual bool session_update(THD *thd, set_var *var) + { + return update(thd, var, &session_var(thd, vers_asof_timestamp_t)); + } + + virtual bool session_is_default(THD *thd) + { + const vers_asof_timestamp_t &var= session_var(thd, vers_asof_timestamp_t); + return var.type == SYSTEM_TIME_UNSPECIFIED; + } + + virtual void session_save_default(THD *thd, set_var *var) + { + save_default(var, &session_var(thd, vers_asof_timestamp_t)); + } + virtual void global_save_default(THD *thd, set_var *var) + { + save_default(var, &global_var(vers_asof_timestamp_t)); + } + +private: + const uchar *value_ptr(THD *thd, vers_asof_timestamp_t &val) const + { + const char *value; + switch (val.type) + { + case SYSTEM_TIME_UNSPECIFIED: + return (uchar*)"DEFAULT"; + break; + case SYSTEM_TIME_AS_OF: + { + char *buf= (char*) thd->alloc(MAX_DATE_STRING_REP_LENGTH); + MYSQL_TIME ltime; + + thd->variables.time_zone->gmt_sec_to_TIME(<ime, val.unix_time); + ltime.second_part= val.second_part; + + value= buf; + if (buf && !my_datetime_to_str(<ime, buf, 6)) + { + my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), name.str, "NULL (wrong datetime)"); + value= thd->strdup("Error: wrong datetime"); + } + break; + } + default: + my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), name.str, "NULL (wrong range type)"); + value= thd->strdup("Error: wrong range type"); + } + return reinterpret_cast<const uchar *>(value); + } + +public: + virtual const uchar *session_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return value_ptr(thd, session_var(thd, vers_asof_timestamp_t)); } + virtual const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const + { return value_ptr(thd, global_var(vers_asof_timestamp_t)); } +}; |