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mariadb/include/mysql/plugin.h
Vasilii Lakhin 5f7c2a617f Fix typos in C comments in miscellaneous files
2025-03-24 13:36:28 +11:00

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/* Copyright (c) 2005, 2013, Oracle and/or its affiliates
Copyright (C) 2009, 2017, MariaDB
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
Interfaces for creating server and client plugins.
*/
#ifndef MYSQL_PLUGIN_INCLUDED
#define MYSQL_PLUGIN_INCLUDED
/*
On Windows, exports from DLL need to be declared
Also, plugin needs to be declared as extern "C" because MSVC
unlike other compilers, uses C++ mangling for variables not only
for functions.
*/
#ifdef MYSQL_DYNAMIC_PLUGIN
#ifdef _MSC_VER
#define MYSQL_DLLEXPORT _declspec(dllexport)
#else
#define MYSQL_DLLEXPORT
#endif
#else
#define MYSQL_DLLEXPORT
#endif
#ifdef __cplusplus
#define MYSQL_PLUGIN_EXPORT extern "C" MYSQL_DLLEXPORT
#else
#define MYSQL_PLUGIN_EXPORT MYSQL_DLLEXPORT
#endif
#ifdef __cplusplus
class THD;
class Item;
#define MYSQL_THD THD*
#else
struct THD;
typedef struct THD* MYSQL_THD;
#endif
typedef char my_bool;
typedef void * MYSQL_PLUGIN;
#include <mysql/services.h>
#define MYSQL_XIDDATASIZE 128
/**
struct st_mysql_xid is binary compatible with the XID structure as
in the X/Open CAE Specification, Distributed Transaction Processing:
The XA Specification, X/Open Company Ltd., 1991.
http://www.opengroup.org/bookstore/catalog/c193.htm
@see XID in sql/handler.h
*/
struct st_mysql_xid {
long formatID;
long gtrid_length;
long bqual_length;
char data[MYSQL_XIDDATASIZE]; /* Not \0-terminated */
};
typedef struct st_mysql_xid MYSQL_XID;
/*************************************************************************
Plugin API. Common for all plugin types.
*/
/** MySQL plugin interface version */
#define MYSQL_PLUGIN_INTERFACE_VERSION 0x0104
/** MariaDB plugin interface version */
#define MARIA_PLUGIN_INTERFACE_VERSION 0x010f
/*
The allowable types of plugins
*/
#define MYSQL_UDF_PLUGIN 0 /**< not implemented */
#define MYSQL_STORAGE_ENGINE_PLUGIN 1
#define MYSQL_FTPARSER_PLUGIN 2 /**< Full-text parser plugin */
#define MYSQL_DAEMON_PLUGIN 3
#define MYSQL_INFORMATION_SCHEMA_PLUGIN 4
#define MYSQL_AUDIT_PLUGIN 5
#define MYSQL_REPLICATION_PLUGIN 6
#define MYSQL_AUTHENTICATION_PLUGIN 7
#define MYSQL_MAX_PLUGIN_TYPE_NUM 12 /**< The number of plugin types */
/* MariaDB plugin types */
/** Client and server password validation */
#define MariaDB_PASSWORD_VALIDATION_PLUGIN 8
/**< Encryption and key management plugins */
#define MariaDB_ENCRYPTION_PLUGIN 9
/**< Plugins for SQL data storage types */
#define MariaDB_DATA_TYPE_PLUGIN 10
/**< Plugins for new native SQL functions */
#define MariaDB_FUNCTION_PLUGIN 11
/* We use the following strings to define licenses for plugins */
#define PLUGIN_LICENSE_PROPRIETARY 0
#define PLUGIN_LICENSE_GPL 1
#define PLUGIN_LICENSE_BSD 2
#define PLUGIN_LICENSE_PROPRIETARY_STRING "PROPRIETARY"
#define PLUGIN_LICENSE_GPL_STRING "GPL"
#define PLUGIN_LICENSE_BSD_STRING "BSD"
/* definitions of code maturity for plugins */
#define MariaDB_PLUGIN_MATURITY_UNKNOWN 0
#define MariaDB_PLUGIN_MATURITY_EXPERIMENTAL 1
#define MariaDB_PLUGIN_MATURITY_ALPHA 2
#define MariaDB_PLUGIN_MATURITY_BETA 3
#define MariaDB_PLUGIN_MATURITY_GAMMA 4
#define MariaDB_PLUGIN_MATURITY_STABLE 5
/*
Macros for beginning and ending plugin declarations. Between
mysql_declare_plugin and mysql_declare_plugin_end there should
be a st_mysql_plugin struct for each plugin to be declared.
*/
#ifndef MYSQL_DYNAMIC_PLUGIN
#define __MYSQL_DECLARE_PLUGIN(NAME, VERSION, PSIZE, DECLS) \
int VERSION= MYSQL_PLUGIN_INTERFACE_VERSION; \
int PSIZE= sizeof(struct st_mysql_plugin); \
struct st_mysql_plugin DECLS[]= {
#define MARIA_DECLARE_PLUGIN__(NAME, VERSION, PSIZE, DECLS) \
MYSQL_PLUGIN_EXPORT int VERSION; \
int VERSION= MARIA_PLUGIN_INTERFACE_VERSION; \
MYSQL_PLUGIN_EXPORT int PSIZE; \
int PSIZE= sizeof(struct st_maria_plugin); \
MYSQL_PLUGIN_EXPORT struct st_maria_plugin DECLS[]; \
struct st_maria_plugin DECLS[]= {
#else
#define __MYSQL_DECLARE_PLUGIN(NAME, VERSION, PSIZE, DECLS) \
MYSQL_PLUGIN_EXPORT int _mysql_plugin_interface_version_; \
int _mysql_plugin_interface_version_= MYSQL_PLUGIN_INTERFACE_VERSION; \
MYSQL_PLUGIN_EXPORT int _mysql_sizeof_struct_st_plugin_; \
int _mysql_sizeof_struct_st_plugin_= sizeof(struct st_mysql_plugin); \
MYSQL_PLUGIN_EXPORT struct st_mysql_plugin _mysql_plugin_declarations_[]; \
struct st_mysql_plugin _mysql_plugin_declarations_[]= {
#define MARIA_DECLARE_PLUGIN__(NAME, VERSION, PSIZE, DECLS) \
MYSQL_PLUGIN_EXPORT int _maria_plugin_interface_version_; \
int _maria_plugin_interface_version_= MARIA_PLUGIN_INTERFACE_VERSION; \
MYSQL_PLUGIN_EXPORT int _maria_sizeof_struct_st_plugin_; \
int _maria_sizeof_struct_st_plugin_= sizeof(struct st_maria_plugin); \
MYSQL_PLUGIN_EXPORT struct st_maria_plugin _maria_plugin_declarations_[]; \
struct st_maria_plugin _maria_plugin_declarations_[]= {
#endif
#define mysql_declare_plugin(NAME) \
__MYSQL_DECLARE_PLUGIN(NAME, \
builtin_ ## NAME ## _plugin_interface_version, \
builtin_ ## NAME ## _sizeof_struct_st_plugin, \
builtin_ ## NAME ## _plugin)
#define maria_declare_plugin(NAME) \
MARIA_DECLARE_PLUGIN__(NAME, \
builtin_maria_ ## NAME ## _plugin_interface_version, \
builtin_maria_ ## NAME ## _sizeof_struct_st_plugin, \
builtin_maria_ ## NAME ## _plugin)
#define mysql_declare_plugin_end ,{0,0,0,0,0,0,0,0,0,0,0,0,0}}
#define maria_declare_plugin_end ,{0,0,0,0,0,0,0,0,0,0,0,0,0}}
/*
declarations for SHOW STATUS support in plugins
*/
enum enum_mysql_show_type
{
SHOW_UNDEF, SHOW_BOOL, SHOW_UINT, SHOW_ULONG,
SHOW_ULONGLONG, SHOW_CHAR, SHOW_CHAR_PTR,
SHOW_ARRAY, SHOW_FUNC, SHOW_DOUBLE,
SHOW_SINT, SHOW_SLONG, SHOW_SLONGLONG, SHOW_SIMPLE_FUNC,
SHOW_SIZE_T, SHOW_always_last
};
/* backward compatibility mapping. */
#define SHOW_INT SHOW_UINT
#define SHOW_LONG SHOW_ULONG
#define SHOW_LONGLONG SHOW_ULONGLONG
enum enum_var_type
{
SHOW_OPT_DEFAULT= 0, SHOW_OPT_SESSION, SHOW_OPT_GLOBAL
};
struct st_mysql_show_var {
const char *name;
void *value;
enum enum_mysql_show_type type;
};
struct system_status_var;
#define SHOW_VAR_FUNC_BUFF_SIZE (256 * sizeof(void*))
typedef int (*mysql_show_var_func)(MYSQL_THD, struct st_mysql_show_var*, void *, struct system_status_var *status_var, enum enum_var_type);
static inline
struct st_mysql_show_var SHOW_FUNC_ENTRY(const char *name,
mysql_show_var_func func_arg)
{
struct st_mysql_show_var tmp;
tmp.name= name;
tmp.value= (void*) func_arg;
tmp.type= SHOW_FUNC;
return tmp;
};
/*
Constants for plugin flags.
*/
#define PLUGIN_OPT_NO_INSTALL 1UL /**< Not dynamically loadable */
#define PLUGIN_OPT_NO_UNINSTALL 2UL /**< Not dynamically unloadable */
/*
declarations for server variables and command line options
*/
#define PLUGIN_VAR_BOOL 0x0001
#define PLUGIN_VAR_INT 0x0002
#define PLUGIN_VAR_LONG 0x0003
#define PLUGIN_VAR_LONGLONG 0x0004
#define PLUGIN_VAR_STR 0x0005
#define PLUGIN_VAR_ENUM 0x0006
#define PLUGIN_VAR_SET 0x0007
#define PLUGIN_VAR_DOUBLE 0x0008
#define PLUGIN_VAR_UNSIGNED 0x0080
#define PLUGIN_VAR_THDLOCAL 0x0100 /**< Variable is per-connection */
#define PLUGIN_VAR_READONLY 0x0200 /**< Server variable is read only */
#define PLUGIN_VAR_NOSYSVAR 0x0400 /**< Not a server variable */
#define PLUGIN_VAR_NOCMDOPT 0x0800 /**< Not a command line option */
#define PLUGIN_VAR_NOCMDARG 0x1000 /**< No argument for cmd line */
#define PLUGIN_VAR_RQCMDARG 0x0000 /**< Argument required for cmd line */
#define PLUGIN_VAR_OPCMDARG 0x2000 /**< Argument optional for cmd line */
#define PLUGIN_VAR_DEPRECATED 0x4000 /**< Server variable is deprecated */
#define PLUGIN_VAR_MEMALLOC 0x8000 /**< String needs memory allocated */
struct st_mysql_sys_var;
struct st_mysql_value;
/**
SYNOPSIS
(*mysql_var_check_func)()
thd thread handle
var dynamic variable being altered
save pointer to temporary storage
value user provided value
RETURN
0 user provided value is OK and the update func may be called.
any other value indicates error.
This function should parse the user provided value and store in the
provided temporary storage any data as required by the update func.
There is sufficient space in the temporary storage to store a double.
Note that the update func may not be called if any other error occurs
so any memory allocated should be thread-local so that it may be freed
automatically at the end of the statement.
*/
typedef int (*mysql_var_check_func)(MYSQL_THD thd,
struct st_mysql_sys_var *var,
void *save, struct st_mysql_value *value);
/**
SYNOPSIS
(*mysql_var_update_func)()
thd thread handle
var dynamic variable being altered
var_ptr pointer to dynamic variable
save pointer to temporary storage
RETURN
NONE
This function should use the validated value stored in the temporary store
and persist it in the provided pointer to the dynamic variable.
For example, strings may require memory to be allocated.
*/
typedef void (*mysql_var_update_func)(MYSQL_THD thd,
struct st_mysql_sys_var *var,
void *var_ptr, const void *save);
/* the following declarations are for internal use only */
#define PLUGIN_VAR_MASK \
(PLUGIN_VAR_READONLY | PLUGIN_VAR_NOSYSVAR | \
PLUGIN_VAR_NOCMDOPT | PLUGIN_VAR_NOCMDARG | \
PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_RQCMDARG | \
PLUGIN_VAR_DEPRECATED | PLUGIN_VAR_MEMALLOC)
#define MYSQL_PLUGIN_VAR_HEADER \
int flags; \
const char *name; \
const char *comment; \
mysql_var_check_func check; \
mysql_var_update_func update
#define MYSQL_SYSVAR_NAME(name) mysql_sysvar_ ## name
#define MYSQL_SYSVAR(name) \
((struct st_mysql_sys_var *)&(MYSQL_SYSVAR_NAME(name)))
/*
for global variables, the value pointer is the first
element after the header, the default value is the second.
for thread variables, the value offset is the first
element after the header, the default value is the second.
*/
#define DECLARE_MYSQL_SYSVAR_BASIC(name, type) struct { \
MYSQL_PLUGIN_VAR_HEADER; \
type *value; \
const type def_val; \
} MYSQL_SYSVAR_NAME(name)
#define DECLARE_MYSQL_SYSVAR_CONST_BASIC(name, type) struct { \
MYSQL_PLUGIN_VAR_HEADER; \
const type *value; \
const type def_val; \
} MYSQL_SYSVAR_NAME(name)
#define DECLARE_MYSQL_SYSVAR_SIMPLE(name, type) struct { \
MYSQL_PLUGIN_VAR_HEADER; \
type *value; type def_val; \
type min_val; type max_val; \
type blk_sz; \
} MYSQL_SYSVAR_NAME(name)
#define DECLARE_MYSQL_SYSVAR_TYPELIB(name, type) struct { \
MYSQL_PLUGIN_VAR_HEADER; \
type *value; type def_val; \
TYPELIB *typelib; \
} MYSQL_SYSVAR_NAME(name)
#define DECLARE_THDVAR_FUNC(type) \
type *(*resolve)(MYSQL_THD thd, int offset)
#define DECLARE_MYSQL_THDVAR_BASIC(name, type) struct { \
MYSQL_PLUGIN_VAR_HEADER; \
int offset; \
const type def_val; \
DECLARE_THDVAR_FUNC(type); \
} MYSQL_SYSVAR_NAME(name)
#define DECLARE_MYSQL_THDVAR_SIMPLE(name, type) struct { \
MYSQL_PLUGIN_VAR_HEADER; \
int offset; \
type def_val; type min_val; \
type max_val; type blk_sz; \
DECLARE_THDVAR_FUNC(type); \
} MYSQL_SYSVAR_NAME(name)
#define DECLARE_MYSQL_THDVAR_TYPELIB(name, type) struct { \
MYSQL_PLUGIN_VAR_HEADER; \
int offset; \
const type def_val; \
DECLARE_THDVAR_FUNC(type); \
TYPELIB *typelib; \
} MYSQL_SYSVAR_NAME(name)
/*
the following declarations are for use by plugin implementors
*/
#define MYSQL_SYSVAR_BOOL(name, varname, opt, comment, check, update, def) \
DECLARE_MYSQL_SYSVAR_BASIC(name, char) = { \
PLUGIN_VAR_BOOL | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def}
#define MYSQL_SYSVAR_STR(name, varname, opt, comment, check, update, def) \
DECLARE_MYSQL_SYSVAR_BASIC(name, char *) = { \
PLUGIN_VAR_STR | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def}
#define MYSQL_SYSVAR_CONST_STR(name, varname, opt, comment, check, update, def) \
DECLARE_MYSQL_SYSVAR_CONST_BASIC(name, char *) = { \
PLUGIN_VAR_STR | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def}
#define MYSQL_SYSVAR_INT(name, varname, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_SYSVAR_SIMPLE(name, int) = { \
PLUGIN_VAR_INT | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def, min, max, blk }
#define MYSQL_SYSVAR_UINT(name, varname, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_SYSVAR_SIMPLE(name, unsigned int) = { \
PLUGIN_VAR_INT | PLUGIN_VAR_UNSIGNED | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def, min, max, blk }
#define MYSQL_SYSVAR_LONG(name, varname, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_SYSVAR_SIMPLE(name, long) = { \
PLUGIN_VAR_LONG | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def, min, max, blk }
#define MYSQL_SYSVAR_ULONG(name, varname, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_SYSVAR_SIMPLE(name, unsigned long) = { \
PLUGIN_VAR_LONG | PLUGIN_VAR_UNSIGNED | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def, min, max, blk }
#define MYSQL_SYSVAR_LONGLONG(name, varname, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_SYSVAR_SIMPLE(name, long long) = { \
PLUGIN_VAR_LONGLONG | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def, min, max, blk }
#define MYSQL_SYSVAR_ULONGLONG(name, varname, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_SYSVAR_SIMPLE(name, unsigned long long) = { \
PLUGIN_VAR_LONGLONG | PLUGIN_VAR_UNSIGNED | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def, min, max, blk }
#define MYSQL_SYSVAR_UINT64_T(name, varname, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_SYSVAR_SIMPLE(name, uint64_t) = { \
PLUGIN_VAR_LONGLONG | PLUGIN_VAR_UNSIGNED | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def, min, max, blk }
#ifdef _WIN64
#define MYSQL_SYSVAR_SIZE_T(name, varname, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_SYSVAR_SIMPLE(name, size_t) = { \
PLUGIN_VAR_LONGLONG | PLUGIN_VAR_UNSIGNED | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def, min, max, blk }
#else
#define MYSQL_SYSVAR_SIZE_T(name, varname, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_SYSVAR_SIMPLE(name, size_t) = { \
PLUGIN_VAR_LONG | PLUGIN_VAR_UNSIGNED | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def, min, max, blk }
#endif
#define MYSQL_SYSVAR_ENUM(name, varname, opt, comment, check, update, def, typelib) \
DECLARE_MYSQL_SYSVAR_TYPELIB(name, unsigned long) = { \
PLUGIN_VAR_ENUM | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def, typelib }
#define MYSQL_SYSVAR_SET(name, varname, opt, comment, check, update, def, typelib) \
DECLARE_MYSQL_SYSVAR_TYPELIB(name, unsigned long long) = { \
PLUGIN_VAR_SET | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def, typelib }
#define MYSQL_SYSVAR_DOUBLE(name, varname, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_SYSVAR_SIMPLE(name, double) = { \
PLUGIN_VAR_DOUBLE | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def, min, max, blk }
#define MYSQL_THDVAR_BOOL(name, opt, comment, check, update, def) \
DECLARE_MYSQL_THDVAR_BASIC(name, char) = { \
PLUGIN_VAR_BOOL | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, -1, def, NULL}
#define MYSQL_THDVAR_STR(name, opt, comment, check, update, def) \
DECLARE_MYSQL_THDVAR_BASIC(name, char *) = { \
PLUGIN_VAR_STR | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, -1, def, NULL}
#define MYSQL_THDVAR_INT(name, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_THDVAR_SIMPLE(name, int) = { \
PLUGIN_VAR_INT | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, -1, def, min, max, blk, NULL }
#define MYSQL_THDVAR_UINT(name, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_THDVAR_SIMPLE(name, unsigned int) = { \
PLUGIN_VAR_INT | PLUGIN_VAR_THDLOCAL | PLUGIN_VAR_UNSIGNED | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, -1, def, min, max, blk, NULL }
#define MYSQL_THDVAR_LONG(name, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_THDVAR_SIMPLE(name, long) = { \
PLUGIN_VAR_LONG | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, -1, def, min, max, blk, NULL }
#define MYSQL_THDVAR_ULONG(name, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_THDVAR_SIMPLE(name, unsigned long) = { \
PLUGIN_VAR_LONG | PLUGIN_VAR_THDLOCAL | PLUGIN_VAR_UNSIGNED | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, -1, def, min, max, blk, NULL }
#define MYSQL_THDVAR_LONGLONG(name, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_THDVAR_SIMPLE(name, long long) = { \
PLUGIN_VAR_LONGLONG | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, -1, def, min, max, blk, NULL }
#define MYSQL_THDVAR_ULONGLONG(name, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_THDVAR_SIMPLE(name, unsigned long long) = { \
PLUGIN_VAR_LONGLONG | PLUGIN_VAR_THDLOCAL | PLUGIN_VAR_UNSIGNED | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, -1, def, min, max, blk, NULL }
#define MYSQL_THDVAR_ENUM(name, opt, comment, check, update, def, typelib) \
DECLARE_MYSQL_THDVAR_TYPELIB(name, unsigned long) = { \
PLUGIN_VAR_ENUM | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, -1, def, NULL, typelib }
#define MYSQL_THDVAR_SET(name, opt, comment, check, update, def, typelib) \
DECLARE_MYSQL_THDVAR_TYPELIB(name, unsigned long long) = { \
PLUGIN_VAR_SET | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, -1, def, NULL, typelib }
#define MYSQL_THDVAR_DOUBLE(name, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_THDVAR_SIMPLE(name, double) = { \
PLUGIN_VAR_DOUBLE | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, -1, def, min, max, blk, NULL }
/* accessor macros */
#define SYSVAR(name) \
(*(MYSQL_SYSVAR_NAME(name).value))
/* when thd == null, result points to global value */
#define THDVAR(thd, name) \
(*(MYSQL_SYSVAR_NAME(name).resolve(thd, MYSQL_SYSVAR_NAME(name).offset)))
/**
Plugin description structure.
*/
struct st_mysql_plugin
{
int type; /**< the plugin type (a MYSQL_XXX_PLUGIN value) */
void *info; /**< pointer to type-specific plugin descriptor */
const char *name; /**< plugin name */
const char *author; /**< plugin author (for I_S.PLUGINS) */
const char *descr; /**< general descriptive text (for I_S.PLUGINS) */
int license; /**< the plugin license (PLUGIN_LICENSE_XXX) */
/**
The function to invoke when plugin is loaded. Plugin
initialisation done here should defer any ALTER TABLE queries to
after the ddl recovery is done, in the signal_ddl_recovery_done()
callback called by ha_signal_ddl_recovery_done().
*/
int (*init)(void *);
int (*deinit)(void *);/**< the function to invoke when plugin is unloaded */
unsigned int version; /**< plugin version (for I_S.PLUGINS) */
struct st_mysql_show_var *status_vars;
struct st_mysql_sys_var **system_vars;
void * __reserved1; /**< reserved for dependency checking */
unsigned long flags; /**< flags for plugin */
};
/**
MariaDB extension for plugins declaration structure.
It also copies current MySQL plugin fields to have more independency
in plugins extension
*/
struct st_maria_plugin
{
int type; /**< the plugin type (a MYSQL_XXX_PLUGIN value) */
void *info; /**< pointer to type-specific plugin descriptor */
const char *name; /**< plugin name */
const char *author; /**< plugin author (for SHOW PLUGINS) */
const char *descr; /**< general descriptive text (for SHOW PLUGINS ) */
int license; /**< the plugin license (PLUGIN_LICENSE_XXX) */
/**
The function to invoke when plugin is loaded. Plugin
initialisation done here should defer any ALTER TABLE queries to
after the ddl recovery is done, in the signal_ddl_recovery_done()
callback called by ha_signal_ddl_recovery_done().
*/
int (*init)(void *);
int (*deinit)(void *);/**< the function to invoke when plugin is unloaded */
unsigned int version; /**< plugin version (for SHOW PLUGINS) */
struct st_mysql_show_var *status_vars;
struct st_mysql_sys_var **system_vars;
const char *version_info; /**< plugin version string */
unsigned int maturity; /**< MariaDB_PLUGIN_MATURITY_XXX */
};
/*************************************************************************
API for Full-text parser plugin. (MYSQL_FTPARSER_PLUGIN)
*/
#include "plugin_ftparser.h"
/*************************************************************************
API for Storage Engine plugin. (MYSQL_DAEMON_PLUGIN)
*/
/* daemon plugins of different MySQL releases are incompatible */
#define MYSQL_DAEMON_INTERFACE_VERSION (MYSQL_VERSION_ID << 8)
/*
Here we define only the descriptor structure, that is referred from
st_mysql_plugin.
*/
struct st_mysql_daemon
{
int interface_version;
};
/*************************************************************************
API for I_S plugin. (MYSQL_INFORMATION_SCHEMA_PLUGIN)
*/
/* information schema plugins different MySQL releases are incompatible */
#define MYSQL_INFORMATION_SCHEMA_INTERFACE_VERSION (MYSQL_VERSION_ID << 8)
/*
Here we define only the descriptor structure, that is referred from
st_mysql_plugin.
*/
struct st_mysql_information_schema
{
int interface_version;
};
/*************************************************************************
API for Storage Engine plugin. (MYSQL_STORAGE_ENGINE_PLUGIN)
*/
/* storage engines of different MySQL releases are incompatible */
#define MYSQL_HANDLERTON_INTERFACE_VERSION (MYSQL_VERSION_ID << 8)
/*
The real API is in the sql/handler.h
Here we define only the descriptor structure, that is referred from
st_mysql_plugin.
*/
struct st_mysql_storage_engine
{
int interface_version;
};
struct transaction_participant;
/*
API for Replication plugin. (MYSQL_REPLICATION_PLUGIN)
*/
#define MYSQL_REPLICATION_INTERFACE_VERSION 0x0200
/**
Replication plugin descriptor
*/
struct Mysql_replication {
int interface_version;
};
#define MYSQL_VALUE_TYPE_STRING 0
#define MYSQL_VALUE_TYPE_REAL 1
#define MYSQL_VALUE_TYPE_INT 2
/*************************************************************************
st_mysql_value struct for reading values from mysqld.
Used by server variables framework to parse user-provided values.
Will be used for arguments when implementing UDFs.
Note that val_str() returns a string in temporary memory
that will be freed at the end of statement. Copy the string
if you need it to persist.
*/
struct st_mysql_value
{
int (*value_type)(struct st_mysql_value *);
const char *(*val_str)(struct st_mysql_value *, char *buffer, int *length);
int (*val_real)(struct st_mysql_value *, double *realbuf);
int (*val_int)(struct st_mysql_value *, long long *intbuf);
int (*is_unsigned)(struct st_mysql_value *);
};
/*************************************************************************
Miscellaneous functions for plugin implementors
*/
#ifdef __cplusplus
extern "C" {
#endif
int thd_in_lock_tables(const MYSQL_THD thd);
int thd_tablespace_op(const MYSQL_THD thd);
long long thd_test_options(const MYSQL_THD thd, long long test_options);
int thd_sql_command(const MYSQL_THD thd);
struct DDL_options_st;
struct DDL_options_st *thd_ddl_options(const MYSQL_THD thd);
void thd_storage_lock_wait(MYSQL_THD thd, long long value);
int thd_tx_isolation(const MYSQL_THD thd);
int thd_tx_is_read_only(const MYSQL_THD thd);
/**
Create a temporary file.
@details
The temporary file is created in a location specified by the mysql
server configuration (--tmpdir option). The caller does not need to
delete the file, it will be deleted automatically.
@param prefix prefix for temporary file name
@retval -1 error
@retval >= 0 a file handle that can be passed to dup or my_close
*/
int mysql_tmpfile(const char *prefix);
/**
Return the thread id of a user thread
@param thd user thread connection handle
@return thread id
*/
unsigned long thd_get_thread_id(const MYSQL_THD thd);
/**
Get the XID for this connection's transaction
@param thd user thread connection handle
@param xid location where identifier is stored
*/
void thd_get_xid(const MYSQL_THD thd, MYSQL_XID *xid);
/**
Invalidate the query cache for a given table.
@param thd user thread connection handle
@param key databasename\\0tablename\\0
@param key_length length of key in bytes, including the NUL bytes
@param using_trx flag: TRUE if using transactions, FALSE otherwise
*/
void mysql_query_cache_invalidate4(MYSQL_THD thd,
const char *key, unsigned int key_length,
int using_trx);
/**
Provide a handler data getter to simplify coding
*/
void *thd_get_ha_data(const MYSQL_THD thd, const struct transaction_participant *hton);
/**
Provide a handler data setter to simplify coding
@details
Set ha_data pointer (storage engine per-connection information).
To avoid unclean deactivation (uninstall) of storage engine plugin
in the middle of transaction, additional storage engine plugin
lock is acquired.
If ha_data is not null and storage engine plugin was not locked
by thd_set_ha_data() in this connection before, storage engine
plugin gets locked.
If ha_data is null and storage engine plugin was locked by
thd_set_ha_data() in this connection before, storage engine
plugin lock gets released.
If transaction_participant::close_connection() didn't reset ha_data, server
does it immediately after calling transaction_participant::close_connection()
*/
void thd_set_ha_data(MYSQL_THD thd, const struct transaction_participant *hton,
const void *ha_data);
/**
Signal that the first part of handler commit is finished, and that the
committed transaction is now visible and has fixed commit ordering with
respect to other transactions. The commit need _not_ be durable yet, and
typically will not be when this call makes sense.
This call is optional, if the storage engine does not call it the upper
layer will after the handler commit() method is done. However, the storage
engine may choose to call it itself to increase the possibility for group
commit.
In-order parallel replication uses this to apply different transaction in
parallel, but delay the commits of later transactions until earlier
transactions have committed first, thus achieving increased performance on
multi-core systems while still preserving full transaction consistency.
The storage engine can call this from within the commit() method, typically
after the commit record has been written to the transaction log, but before
the log has been fsync()'ed. This will allow the next replicated transaction
to proceed to commit before the first one has done fsync() or similar. Thus,
it becomes possible for multiple sequential replicated transactions to share
a single fsync() inside the engine in group commit.
Note that this method should _not_ be called from within the commit_ordered()
method, or any other place in the storage engine. When commit_ordered() is
used (typically when binlog is enabled), the transaction coordinator takes
care of this and makes group commit in the storage engine possible without
any other action needed on the part of the storage engine. This function
thd_wakeup_subsequent_commits() is only needed when no transaction
coordinator is used, meaning a single storage engine and no binary log.
*/
void thd_wakeup_subsequent_commits(MYSQL_THD thd, int wakeup_error);
#ifdef __cplusplus
}
#endif
#endif
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