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sql_plugin.h
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/* Copyright (c) 2005, 2012, Oracle and/or its affiliates.
Copyright (c) 2009, 2017, 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 */
#ifndef _sql_plugin_h
#define _sql_plugin_h
/*
the following #define adds server-only members to enum_mysql_show_type,
that is defined in plugin.h
*/
#define SHOW_always_last SHOW_KEY_CACHE_LONG, \
SHOW_HAVE, SHOW_MY_BOOL, SHOW_HA_ROWS, SHOW_SYS, \
SHOW_LONG_NOFLUSH, SHOW_LONGLONG_NOFLUSH, SHOW_LEX_STRING, \
SHOW_ATOMIC_COUNTER_UINT32_T, \
/* SHOW_*_STATUS must be at the end, SHOW_LONG_STATUS being first */ \
SHOW_LONG_STATUS, SHOW_DOUBLE_STATUS, SHOW_LONGLONG_STATUS, \
SHOW_UINT32_STATUS, SHOW_MICROSECOND_STATUS,
#include "mariadb.h"
#undef SHOW_always_last
#include "m_string.h" /* LEX_STRING */
#include "my_alloc.h" /* MEM_ROOT */
class sys_var;
enum SHOW_COMP_OPTION { SHOW_OPTION_YES, SHOW_OPTION_NO, SHOW_OPTION_DISABLED};
enum enum_plugin_load_option { PLUGIN_OFF, PLUGIN_ON, PLUGIN_FORCE,
PLUGIN_FORCE_PLUS_PERMANENT };
extern const char *global_plugin_typelib_names[];
extern volatile int global_plugin_version;
extern ulong dlopen_count;
#include <my_sys.h>
#include "sql_list.h"
#ifdef DBUG_OFF
#define plugin_ref_to_int(A) A
#define plugin_int_to_ref(A) A
#else
#define plugin_ref_to_int(A) (A ? A[0] : NULL)
#define plugin_int_to_ref(A) &(A)
#endif
/*
the following flags are valid for plugin_init()
*/
#define PLUGIN_INIT_SKIP_PLUGIN_TABLE 1U
#define PLUGIN_INIT_SKIP_INITIALIZATION 2U
#define INITIAL_LEX_PLUGIN_LIST_SIZE 16
typedef enum enum_mysql_show_type SHOW_TYPE;
typedef struct st_mysql_show_var SHOW_VAR;
#define MYSQL_ANY_PLUGIN -1
/*
different values of st_plugin_int::state
though they look like a bitmap, plugin may only
be in one of those eigenstates, not in a superposition of them :)
It's a bitmap, because it makes it easier to test
"whether the state is one of those..."
*/
#define PLUGIN_IS_FREED 1U
#define PLUGIN_IS_DELETED 2U
#define PLUGIN_IS_UNINITIALIZED 4U
#define PLUGIN_IS_READY 8U
#define PLUGIN_IS_DYING 16U
#define PLUGIN_IS_DISABLED 32U
struct st_ptr_backup {
void **ptr;
void *value;
void save(void **p) { ptr= p; value= *p; }
void save(const char **p) { save((void**)p); }
void restore() { *ptr= value; }
};
/* A handle for the dynamic library containing a plugin or plugins. */
struct st_plugin_dl
{
LEX_CSTRING dl;
void *handle;
struct st_maria_plugin *plugins;
st_ptr_backup *ptr_backup;
uint nbackups;
uint ref_count; /* number of plugins loaded from the library */
int mysqlversion;
int mariaversion;
bool allocated;
};
/* A handle of a plugin */
struct st_plugin_int
{
LEX_CSTRING name;
struct st_maria_plugin *plugin;
struct st_plugin_dl *plugin_dl;
st_ptr_backup *ptr_backup;
uint nbackups;
uint state;
uint ref_count; /* number of threads using the plugin */
uint locks_total; /* how many times the plugin was locked */
void *data; /* plugin type specific, e.g. handlerton */
MEM_ROOT mem_root; /* memory for dynamic plugin structures */
sys_var *system_vars; /* server variables for this plugin */
enum enum_plugin_load_option load_option; /* OFF, ON, FORCE, F+PERMANENT */
};
extern mysql_mutex_t LOCK_plugin;
/*
See intern_plugin_lock() for the explanation for the
conditionally defined plugin_ref type
*/
#ifdef DBUG_OFF
typedef struct st_plugin_int *plugin_ref;
#define plugin_ref_to_int(A) A
#define plugin_int_to_ref(A) A
#define plugin_decl(pi) ((pi)->plugin)
#define plugin_dlib(pi) ((pi)->plugin_dl)
#define plugin_data(pi,cast) ((cast)((pi)->data))
#define plugin_name(pi) (&((pi)->name))
#define plugin_state(pi) ((pi)->state)
#define plugin_load_option(pi) ((pi)->load_option)
#define plugin_equals(p1,p2) ((p1) == (p2))
#else
typedef struct st_plugin_int **plugin_ref;
#define plugin_ref_to_int(A) (A ? A[0] : NULL)
#define plugin_int_to_ref(A) &(A)
#define plugin_decl(pi) ((pi)[0]->plugin)
#define plugin_dlib(pi) ((pi)[0]->plugin_dl)
#define plugin_data(pi,cast) ((cast)((pi)[0]->data))
#define plugin_name(pi) (&((pi)[0]->name))
#define plugin_state(pi) ((pi)[0]->state)
#define plugin_load_option(pi) ((pi)[0]->load_option)
#define plugin_equals(p1,p2) ((p1) && (p2) && (p1)[0] == (p2)[0])
#endif
typedef int (*plugin_type_init)(void *);
extern I_List<i_string> *opt_plugin_load_list_ptr;
extern char *opt_plugin_dir_ptr;
extern MYSQL_PLUGIN_IMPORT char opt_plugin_dir[FN_REFLEN];
extern const LEX_CSTRING plugin_type_names[];
extern ulong plugin_maturity;
extern TYPELIB plugin_maturity_values;
extern const char *plugin_maturity_names[];
extern int plugin_init(int *argc, char **argv, int init_flags);
extern void plugin_shutdown(void);
void add_plugin_options(DYNAMIC_ARRAY *options, MEM_ROOT *mem_root);
extern bool plugin_is_ready(const LEX_CSTRING *name, int type);
#define my_plugin_lock_by_name(A,B,C) plugin_lock_by_name(A,B,C)
#define my_plugin_lock(A,B) plugin_lock(A,B)
extern plugin_ref plugin_lock(THD *thd, plugin_ref ptr);
extern plugin_ref plugin_lock_by_name(THD *thd, const LEX_CSTRING *name,
int type);
extern void plugin_unlock(THD *thd, plugin_ref plugin);
extern void plugin_unlock_list(THD *thd, plugin_ref *list, size_t count);
extern bool mysql_install_plugin(THD *thd, const LEX_CSTRING *name,
const LEX_CSTRING *dl);
extern bool mysql_uninstall_plugin(THD *thd, const LEX_CSTRING *name,
const LEX_CSTRING *dl);
extern bool plugin_register_builtin(struct st_mysql_plugin *plugin);
extern void plugin_thdvar_init(THD *thd);
extern void plugin_thdvar_cleanup(THD *thd);
sys_var *find_plugin_sysvar(st_plugin_int *plugin, st_mysql_sys_var *var);
void plugin_opt_set_limits(struct my_option *, const struct st_mysql_sys_var *);
extern SHOW_COMP_OPTION plugin_status(const char *name, size_t len, int type);
extern bool check_valid_path(const char *path, size_t length);
extern void plugin_mutex_init();
typedef my_bool (plugin_foreach_func)(THD *thd,
plugin_ref plugin,
void *arg);
#define plugin_foreach(A,B,C,D) plugin_foreach_with_mask(A,B,C,PLUGIN_IS_READY,D)
extern bool plugin_foreach_with_mask(THD *thd, plugin_foreach_func *func,
int type, uint state_mask, void *arg);
extern void sync_dynamic_session_variables(THD* thd, bool global_lock);
extern bool plugin_dl_foreach(THD *thd, const LEX_CSTRING *dl,
plugin_foreach_func *func, void *arg);
extern void sync_dynamic_session_variables(THD* thd, bool global_lock);
#endif
#ifdef WITH_WSREP
extern void wsrep_plugins_pre_init();
extern void wsrep_plugins_post_init();
#endif /* WITH_WSREP */