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/* Copyright (c) 2005, 2022, Oracle and/or its affiliates.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   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, version 2.0, 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 02110-1301  USA */

#ifndef _my_plugin_h
#define _my_plugin_h

#ifndef MYSQL_ABI_CHECK
#include <stddef.h>
#include "mysql_version.h" /* MYSQL_VERSION_ID */
#endif

/*
  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.
*/
#if defined(_MSC_VER)
#if defined(MYSQL_DYNAMIC_PLUGIN)
  #ifdef __cplusplus
    #define MYSQL_PLUGIN_EXPORT extern "C" __declspec(dllexport)
  #else
    #define MYSQL_PLUGIN_EXPORT __declspec(dllexport)
  #endif
#else /* MYSQL_DYNAMIC_PLUGIN */
  #ifdef __cplusplus
    #define  MYSQL_PLUGIN_EXPORT extern "C"
  #else
    #define MYSQL_PLUGIN_EXPORT 
  #endif
#endif /*MYSQL_DYNAMIC_PLUGIN */
#else /*_MSC_VER */
#define MYSQL_PLUGIN_EXPORT
#endif

#ifdef __cplusplus
class THD;
class Item;
#define MYSQL_THD THD*
#else
#define MYSQL_THD void*
#endif

typedef void * MYSQL_PLUGIN;

#ifndef MYSQL_ABI_CHECK
#include <mysql/services.h>
#endif

#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.
*/

#define MYSQL_PLUGIN_INTERFACE_VERSION 0x0107

/*
  The allowable types of plugins
*/
#define MYSQL_UDF_PLUGIN             0  /* User-defined function        */
#define MYSQL_STORAGE_ENGINE_PLUGIN  1  /* Storage Engine               */
#define MYSQL_FTPARSER_PLUGIN        2  /* Full-text parser plugin      */
#define MYSQL_DAEMON_PLUGIN          3  /* The daemon/raw plugin type */
#define MYSQL_INFORMATION_SCHEMA_PLUGIN  4  /* The I_S plugin type */
#define MYSQL_AUDIT_PLUGIN           5  /* The Audit plugin type        */
#define MYSQL_REPLICATION_PLUGIN     6	/* The replication plugin type */
#define MYSQL_AUTHENTICATION_PLUGIN  7  /* The authentication plugin type */
#define MYSQL_VALIDATE_PASSWORD_PLUGIN  8   /* validate password plugin type */
#define MYSQL_GROUP_REPLICATION_PLUGIN  9  /* The Group Replication plugin */
#define MYSQL_KEYRING_PLUGIN         10  /* The Keyring plugin type   */
#define MYSQL_MAX_PLUGIN_TYPE_NUM    11  /* The number of plugin types   */

/* 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"

/*
  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)                   \
MYSQL_PLUGIN_EXPORT int VERSION= MYSQL_PLUGIN_INTERFACE_VERSION;                                  \
MYSQL_PLUGIN_EXPORT int PSIZE= sizeof(struct st_mysql_plugin);                                    \
MYSQL_PLUGIN_EXPORT struct st_mysql_plugin DECLS[]= {
#else
#define __MYSQL_DECLARE_PLUGIN(NAME, VERSION, PSIZE, DECLS)                   \
MYSQL_PLUGIN_EXPORT int _mysql_plugin_interface_version_= MYSQL_PLUGIN_INTERFACE_VERSION;         \
MYSQL_PLUGIN_EXPORT int _mysql_sizeof_struct_st_plugin_= sizeof(struct st_mysql_plugin);          \
MYSQL_PLUGIN_EXPORT struct st_mysql_plugin _mysql_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 mysql_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_INT,        ///< shown as _unsigned_ int
  SHOW_LONG,       ///< shown as _unsigned_ long
  SHOW_LONGLONG,   ///< shown as _unsigned_ longlong
  SHOW_CHAR, SHOW_CHAR_PTR,
  SHOW_ARRAY, SHOW_FUNC, SHOW_DOUBLE
#ifdef MYSQL_SERVER
  /*
    This include defines server-only values of the enum.
    Using them in plugins is not supported.
  */
  #include "sql_plugin_enum.h"
#endif
};

/**
  Status variable scope.
  Only GLOBAL status variable scope is available in plugins.
*/
enum enum_mysql_show_scope
{
  SHOW_SCOPE_UNDEF,
  SHOW_SCOPE_GLOBAL
#ifdef MYSQL_SERVER
  /* Server-only values. Not supported in plugins. */
  ,
  SHOW_SCOPE_SESSION,
  SHOW_SCOPE_ALL
#endif
};

/**
  SHOW STATUS Server status variable
*/
struct st_mysql_show_var
{
  const char *name;
  char *value;
  enum enum_mysql_show_type type;
  enum enum_mysql_show_scope scope;
};

#define SHOW_VAR_MAX_NAME_LEN 64
#define SHOW_VAR_FUNC_BUFF_SIZE 1024
typedef int (*mysql_show_var_func)(MYSQL_THD, struct st_mysql_show_var*, char *);


/*
  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_NODEFAULT    0x4000 /* SET DEFAULT is prohibited */
#define PLUGIN_VAR_MEMALLOC     0x8000 /* String needs memory allocated */
#define PLUGIN_VAR_INVISIBLE    0x10000 /* Variable should not be shown */

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_MEMALLOC | \
         PLUGIN_VAR_NODEFAULT | PLUGIN_VAR_INVISIBLE)

#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_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;                   \
  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_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_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)      */
  int (*init)(MYSQL_PLUGIN);  /* the function to invoke when plugin is loaded */
  int (*deinit)(MYSQL_PLUGIN);/* 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 */
};

/*************************************************************************
  API for Full-text parser plugin. (MYSQL_FTPARSER_PLUGIN)
*/
#define MYSQL_FTPARSER_INTERFACE_VERSION 0x0101

/*************************************************************************
  API for Query Rewrite plugin. (MYSQL_QUERY_REWRITE_PLUGIN)
*/

#define MYSQL_REWRITE_PRE_PARSE_INTERFACE_VERSION 0x0010
#define MYSQL_REWRITE_POST_PARSE_INTERFACE_VERSION 0x0010

/*************************************************************************
  API for Storage Engine plugin. (MYSQL_DAEMON_PLUGIN)
*/

/* handlertons 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)
*/

/* handlertons of 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)
*/

/* handlertons 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 handlerton;


/*
  API for Replication plugin. (MYSQL_REPLICATION_PLUGIN)
*/
 #define MYSQL_REPLICATION_INTERFACE_VERSION 0x0400

 /**
    Replication plugin descriptor
 */
 struct Mysql_replication {
   int interface_version;
 };

/*************************************************************************
  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.
*/

#define MYSQL_VALUE_TYPE_STRING 0
#define MYSQL_VALUE_TYPE_REAL   1
#define MYSQL_VALUE_TYPE_INT    2

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);
const char *set_thd_proc_info(MYSQL_THD thd, const char *info,
                              const char *calling_func,
                              const char *calling_file,
                              const unsigned int calling_line);
void **thd_ha_data(const MYSQL_THD thd, const struct handlerton *hton);
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);
MYSQL_THD thd_tx_arbitrate(MYSQL_THD requestor, MYSQL_THD holder);
int thd_tx_priority(const MYSQL_THD thd);
int thd_tx_is_dd_trx(const MYSQL_THD thd);
char *thd_security_context(MYSQL_THD thd, char *buffer, size_t length,
                           size_t max_query_len);
/* Increments the row counter, see THD::row_count */
void thd_inc_row_count(MYSQL_THD thd);
int thd_allow_batch(MYSQL_THD thd);


/**
  Mark transaction to rollback and mark error as fatal to a
  sub-statement if in sub statement mode.

  @param thd  user thread connection handle
  @param all  if all != 0, rollback the main transaction
*/

void thd_mark_transaction_to_rollback(MYSQL_THD thd, int all);

/**
  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);

/**
  Check the killed state of a connection

  @details
  In MySQL support for the KILL statement is cooperative. The KILL
  statement only sets a "killed" flag. This function returns the value
  of that flag.  A thread should check it often, especially inside
  time-consuming loops, and gracefully abort the operation if it is
  non-zero.

  @param thd  user thread connection handle
  @retval 0  the connection is active
  @retval 1  the connection has been killed
*/
int thd_killed(const MYSQL_THD thd);

/**
  Set the killed status of the current statement.

  @param thd  user thread connection handle
*/
void thd_set_kill_status(const MYSQL_THD thd);

/**
  Get binary log position for latest written entry.

  @note The file variable will be set to a buffer holding the name of
  the file name currently, but this can change if a rotation
  occur. Copy the string if you want to retain it.

  @param thd Use thread connection handle
  @param file_var Pointer to variable that will hold the file name.
  @param pos_var Pointer to variable that will hold the file position.
 */
void thd_binlog_pos(const MYSQL_THD thd,
                    const char **file_var,
                    unsigned long long *pos_var);

/**
  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/tablename in the canonical format.
  @param key_length  length of key in bytes, including the PATH separator
  @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 handlerton *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 handlerton::close_connection() didn't reset ha_data, server does
  it immediately after calling handlerton::close_connection().
*/
void thd_set_ha_data(MYSQL_THD thd, const struct handlerton *hton,
                     const void *ha_data);
#ifdef __cplusplus
}
#endif

#endif /* _my_plugin_h */

Name	Filetype	Perm	Option
.	dir	drwxr-xr-x	newfile \| newfolder
..	dir	drwxr-xr-x	newfile \| newfolder
psi	dir	drwxr-xr-x	rename \| delete
client_authentication.h	file	-rw-r--r--	edit \| rename \| delete \| download
client_plugin.h	file	-rw-r--r--	edit \| rename \| delete \| download
client_plugin.h.pp	file	-rw-r--r--	edit \| rename \| delete \| download
com_data.h	file	-rw-r--r--	edit \| rename \| delete \| download
get_password.h	file	-rw-r--r--	edit \| rename \| delete \| download
group_replication_priv.h	file	-rw-r--r--	edit \| rename \| delete \| download
innodb_priv.h	file	-rw-r--r--	edit \| rename \| delete \| download
mysql_lex_string.h	file	-rw-r--r--	edit \| rename \| delete \| download
plugin.h	file	-rw-r--r--	edit \| rename \| delete \| download
plugin_audit.h	file	-rw-r--r--	edit \| rename \| delete \| download
plugin_audit.h.pp	file	-rw-r--r--	edit \| rename \| delete \| download
plugin_auth.h	file	-rw-r--r--	edit \| rename \| delete \| download
plugin_auth.h.pp	file	-rw-r--r--	edit \| rename \| delete \| download
plugin_auth_common.h	file	-rw-r--r--	edit \| rename \| delete \| download
plugin_ftparser.h	file	-rw-r--r--	edit \| rename \| delete \| download
plugin_ftparser.h.pp	file	-rw-r--r--	edit \| rename \| delete \| download
plugin_group_replication.h	file	-rw-r--r--	edit \| rename \| delete \| download
plugin_keyring.h	file	-rw-r--r--	edit \| rename \| delete \| download
plugin_keyring.h.pp	file	-rw-r--r--	edit \| rename \| delete \| download
plugin_trace.h	file	-rw-r--r--	edit \| rename \| delete \| download
plugin_validate_password.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_command.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_locking.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_my_plugin_log.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_my_snprintf.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_mysql_alloc.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_mysql_keyring.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_mysql_password_policy.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_mysql_string.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_parser.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_rpl_transaction_ctx.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_rpl_transaction_write_set.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_rules_table.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_security_context.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_srv_session.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_srv_session_info.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_ssl_wrapper.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_thd_alloc.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_thd_engine_lock.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_thd_wait.h	file	-rw-r--r--	edit \| rename \| delete \| download
service_thread_scheduler.h	file	-rw-r--r--	edit \| rename \| delete \| download
services.h	file	-rw-r--r--	edit \| rename \| delete \| download
services.h.pp	file	-rw-r--r--	edit \| rename \| delete \| download
thread_pool_priv.h	file	-rw-r--r--	edit \| rename \| delete \| download
thread_type.h	file	-rw-r--r--	edit \| rename \| delete \| download

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