Remove non-functional code for unloading loadable modules.
The code for unloading a library has been commented-out for over 12
years, ever since commit 602a9ef5a7
, and we're
no closer to supporting it now than we were back then.
Nathan Bossart, reviewed by Michael Paquier and by me.
Discussion: http://postgr.es/m/Ynsc9bRL1caUSBSE@paquier.xyz
This commit is contained in:
parent
78ccd6cca4
commit
ab02d702ef
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@ -77,7 +77,6 @@ static ExecutorFinish_hook_type prev_ExecutorFinish = NULL;
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static ExecutorEnd_hook_type prev_ExecutorEnd = NULL;
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static ExecutorEnd_hook_type prev_ExecutorEnd = NULL;
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void _PG_init(void);
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void _PG_init(void);
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void _PG_fini(void);
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static void explain_ExecutorStart(QueryDesc *queryDesc, int eflags);
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static void explain_ExecutorStart(QueryDesc *queryDesc, int eflags);
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static void explain_ExecutorRun(QueryDesc *queryDesc,
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static void explain_ExecutorRun(QueryDesc *queryDesc,
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@ -244,19 +243,6 @@ _PG_init(void)
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ExecutorEnd_hook = explain_ExecutorEnd;
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ExecutorEnd_hook = explain_ExecutorEnd;
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}
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}
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/*
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* Module unload callback
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*/
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void
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_PG_fini(void)
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{
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/* Uninstall hooks. */
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ExecutorStart_hook = prev_ExecutorStart;
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ExecutorRun_hook = prev_ExecutorRun;
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ExecutorFinish_hook = prev_ExecutorFinish;
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ExecutorEnd_hook = prev_ExecutorEnd;
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}
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/*
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/*
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* ExecutorStart hook: start up logging if needed
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* ExecutorStart hook: start up logging if needed
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*/
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*/
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@ -33,7 +33,6 @@ static check_password_hook_type prev_check_password_hook = NULL;
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#define MIN_PWD_LENGTH 8
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#define MIN_PWD_LENGTH 8
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extern void _PG_init(void);
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extern void _PG_init(void);
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extern void _PG_fini(void);
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/*
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/*
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* check_password
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* check_password
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@ -149,13 +148,3 @@ _PG_init(void)
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prev_check_password_hook = check_password_hook;
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prev_check_password_hook = check_password_hook;
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check_password_hook = check_password;
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check_password_hook = check_password;
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}
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}
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/*
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* Module unload function
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*/
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void
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_PG_fini(void)
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{
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/* uninstall hook */
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check_password_hook = prev_check_password_hook;
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}
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@ -305,7 +305,6 @@ static bool pgss_save; /* whether to save stats across shutdown */
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/*---- Function declarations ----*/
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/*---- Function declarations ----*/
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void _PG_init(void);
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void _PG_init(void);
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void _PG_fini(void);
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PG_FUNCTION_INFO_V1(pg_stat_statements_reset);
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PG_FUNCTION_INFO_V1(pg_stat_statements_reset);
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PG_FUNCTION_INFO_V1(pg_stat_statements_reset_1_7);
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PG_FUNCTION_INFO_V1(pg_stat_statements_reset_1_7);
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@ -481,23 +480,6 @@ _PG_init(void)
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ProcessUtility_hook = pgss_ProcessUtility;
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ProcessUtility_hook = pgss_ProcessUtility;
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}
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}
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/*
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* Module unload callback
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*/
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void
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_PG_fini(void)
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{
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/* Uninstall hooks. */
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shmem_startup_hook = prev_shmem_startup_hook;
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post_parse_analyze_hook = prev_post_parse_analyze_hook;
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planner_hook = prev_planner_hook;
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ExecutorStart_hook = prev_ExecutorStart;
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ExecutorRun_hook = prev_ExecutorRun;
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ExecutorFinish_hook = prev_ExecutorFinish;
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ExecutorEnd_hook = prev_ExecutorEnd;
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ProcessUtility_hook = prev_ProcessUtility;
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}
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/*
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/*
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* shmem_startup hook: allocate or attach to shared memory,
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* shmem_startup hook: allocate or attach to shared memory,
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* then load any pre-existing statistics from file.
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* then load any pre-existing statistics from file.
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@ -1978,28 +1978,16 @@ PG_MODULE_MAGIC;
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<indexterm zone="xfunc-c-dynload">
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<indexterm zone="xfunc-c-dynload">
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<primary>_PG_init</primary>
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<primary>_PG_init</primary>
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</indexterm>
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</indexterm>
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<indexterm zone="xfunc-c-dynload">
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<primary>_PG_fini</primary>
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</indexterm>
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<indexterm zone="xfunc-c-dynload">
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<indexterm zone="xfunc-c-dynload">
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<primary>library initialization function</primary>
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<primary>library initialization function</primary>
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</indexterm>
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</indexterm>
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<indexterm zone="xfunc-c-dynload">
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<primary>library finalization function</primary>
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</indexterm>
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<para>
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<para>
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Optionally, a dynamically loaded file can contain initialization and
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Optionally, a dynamically loaded file can contain an initialization
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finalization functions. If the file includes a function named
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function. If the file includes a function named
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<function>_PG_init</function>, that function will be called immediately after
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<function>_PG_init</function>, that function will be called immediately after
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loading the file. The function receives no parameters and should
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loading the file. The function receives no parameters and should
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return void. If the file includes a function named
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return void. There is presently no way to unload a dynamically loaded file.
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<function>_PG_fini</function>, that function will be called immediately before
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unloading the file. Likewise, the function receives no parameters and
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should return void. Note that <function>_PG_fini</function> will only be called
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during an unload of the file, not during process termination.
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(Presently, unloads are disabled and will never occur, but this may
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change in the future.)
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</para>
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</para>
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</sect2>
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</sect2>
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@ -802,7 +802,7 @@ HandlePgArchInterrupts(void)
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* Ideally, we would simply unload the previous archive module and
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* Ideally, we would simply unload the previous archive module and
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* load the new one, but there is presently no mechanism for
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* load the new one, but there is presently no mechanism for
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* unloading a library (see the comment above
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* unloading a library (see the comment above
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* internal_unload_library()). To deal with this, we simply restart
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* internal_load_library()). To deal with this, we simply restart
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* the archiver. The new archive module will be loaded when the new
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* the archiver. The new archive module will be loaded when the new
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* archiver process starts up.
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* archiver process starts up.
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*/
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*/
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@ -37,9 +37,8 @@
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#include "utils/hsearch.h"
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#include "utils/hsearch.h"
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/* signatures for PostgreSQL-specific library init/fini functions */
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/* signature for PostgreSQL-specific library init function */
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typedef void (*PG_init_t) (void);
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typedef void (*PG_init_t) (void);
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typedef void (*PG_fini_t) (void);
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/* hashtable entry for rendezvous variables */
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/* hashtable entry for rendezvous variables */
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typedef struct
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typedef struct
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@ -79,7 +78,6 @@ char *Dynamic_library_path;
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static void *internal_load_library(const char *libname);
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static void *internal_load_library(const char *libname);
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static void incompatible_module_error(const char *libname,
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static void incompatible_module_error(const char *libname,
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const Pg_magic_struct *module_magic_data) pg_attribute_noreturn();
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const Pg_magic_struct *module_magic_data) pg_attribute_noreturn();
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static void internal_unload_library(const char *libname);
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static bool file_exists(const char *name);
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static bool file_exists(const char *name);
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static char *expand_dynamic_library_name(const char *name);
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static char *expand_dynamic_library_name(const char *name);
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static void check_restricted_library_name(const char *name);
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static void check_restricted_library_name(const char *name);
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@ -154,9 +152,6 @@ load_file(const char *filename, bool restricted)
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/* Expand the possibly-abbreviated filename to an exact path name */
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/* Expand the possibly-abbreviated filename to an exact path name */
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fullname = expand_dynamic_library_name(filename);
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fullname = expand_dynamic_library_name(filename);
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/* Unload the library if currently loaded */
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internal_unload_library(fullname);
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/* Load the shared library */
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/* Load the shared library */
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(void) internal_load_library(fullname);
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(void) internal_load_library(fullname);
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@ -179,6 +174,11 @@ lookup_external_function(void *filehandle, const char *funcname)
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* loaded. Return the pg_dl* handle for the file.
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* loaded. Return the pg_dl* handle for the file.
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*
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*
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* Note: libname is expected to be an exact name for the library file.
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* Note: libname is expected to be an exact name for the library file.
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*
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* NB: There is presently no way to unload a dynamically loaded file. We might
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* add one someday if we can convince ourselves we have safe protocols for un-
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* hooking from hook function pointers, releasing custom GUC variables, and
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* perhaps other things that are definitely unsafe currently.
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*/
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*/
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static void *
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static void *
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internal_load_library(const char *libname)
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internal_load_library(const char *libname)
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errdetail_internal("%s", details.data)));
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errdetail_internal("%s", details.data)));
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}
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}
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/*
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* Unload the specified dynamic-link library file, if it is loaded.
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*
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* Note: libname is expected to be an exact name for the library file.
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*
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* XXX for the moment, this is disabled, resulting in LOAD of an already-loaded
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* library always being a no-op. We might re-enable it someday if we can
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* convince ourselves we have safe protocols for un-hooking from hook function
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* pointers, releasing custom GUC variables, and perhaps other things that
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* are definitely unsafe currently.
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*/
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static void
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internal_unload_library(const char *libname)
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{
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#ifdef NOT_USED
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DynamicFileList *file_scanner,
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*prv,
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*nxt;
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struct stat stat_buf;
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PG_fini_t PG_fini;
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/*
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* We need to do stat() in order to determine whether this is the same
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* file as a previously loaded file; it's also handy so as to give a good
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* error message if bogus file name given.
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*/
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if (stat(libname, &stat_buf) == -1)
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not access file \"%s\": %m", libname)));
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/*
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* We have to zap all entries in the list that match on either filename or
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* inode, else internal_load_library() will still think it's present.
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*/
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prv = NULL;
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for (file_scanner = file_list; file_scanner != NULL; file_scanner = nxt)
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{
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nxt = file_scanner->next;
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if (strcmp(libname, file_scanner->filename) == 0 ||
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SAME_INODE(stat_buf, *file_scanner))
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{
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if (prv)
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prv->next = nxt;
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else
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file_list = nxt;
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/*
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* If the library has a _PG_fini() function, call it.
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*/
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PG_fini = (PG_fini_t) dlsym(file_scanner->handle, "_PG_fini");
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if (PG_fini)
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(*PG_fini) ();
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clear_external_function_hash(file_scanner->handle);
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dlclose(file_scanner->handle);
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free((char *) file_scanner);
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/* prv does not change */
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}
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else
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prv = file_scanner;
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}
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#endif /* NOT_USED */
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}
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static bool
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static bool
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file_exists(const char *name)
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file_exists(const char *name)
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{
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{
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@ -582,20 +582,6 @@ record_C_func(HeapTuple procedureTuple,
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entry->inforec = inforec;
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entry->inforec = inforec;
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}
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}
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/*
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* clear_external_function_hash: remove entries for a library being closed
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*
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* Presently we just zap the entire hash table, but later it might be worth
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* the effort to remove only the entries associated with the given handle.
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*/
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void
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clear_external_function_hash(void *filehandle)
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{
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if (CFuncHash)
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hash_destroy(CFuncHash);
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CFuncHash = NULL;
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}
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/*
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/*
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* Copy an FmgrInfo struct
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* Copy an FmgrInfo struct
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@ -705,7 +705,6 @@ extern bytea *OidSendFunctionCall(Oid functionId, Datum val);
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* Routines in fmgr.c
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* Routines in fmgr.c
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*/
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*/
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extern const Pg_finfo_record *fetch_finfo_record(void *filehandle, const char *funcname);
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extern const Pg_finfo_record *fetch_finfo_record(void *filehandle, const char *funcname);
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extern void clear_external_function_hash(void *filehandle);
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extern Oid fmgr_internal_function(const char *proname);
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extern Oid fmgr_internal_function(const char *proname);
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extern Oid get_fn_expr_rettype(FmgrInfo *flinfo);
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extern Oid get_fn_expr_rettype(FmgrInfo *flinfo);
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extern Oid get_fn_expr_argtype(FmgrInfo *flinfo, int argnum);
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extern Oid get_fn_expr_argtype(FmgrInfo *flinfo, int argnum);
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@ -1100,8 +1100,6 @@ typedef struct PLpgSQL_execstate
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* variable "PLpgSQL_plugin" and set it to point to a PLpgSQL_plugin struct.
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* variable "PLpgSQL_plugin" and set it to point to a PLpgSQL_plugin struct.
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* Typically the struct could just be static data in the plugin library.
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* Typically the struct could just be static data in the plugin library.
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* We expect that a plugin would do this at library load time (_PG_init()).
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* We expect that a plugin would do this at library load time (_PG_init()).
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* It must also be careful to set the rendezvous variable back to NULL
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* if it is unloaded (_PG_fini()).
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*
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*
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* This structure is basically a collection of function pointers --- at
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* This structure is basically a collection of function pointers --- at
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* various interesting points in pl_exec.c, we call these functions
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* various interesting points in pl_exec.c, we call these functions
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@ -36,9 +36,8 @@ static int post_planning_lock_id = 0;
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/* Save previous planner hook user to be a good citizen */
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/* Save previous planner hook user to be a good citizen */
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static planner_hook_type prev_planner_hook = NULL;
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static planner_hook_type prev_planner_hook = NULL;
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/* Module load/unload functions */
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/* Module load function */
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void _PG_init(void);
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void _PG_init(void);
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void _PG_fini(void);
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/* planner_hook function to provide the desired delay */
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/* planner_hook function to provide the desired delay */
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@ -97,10 +96,3 @@ _PG_init(void)
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prev_planner_hook = planner_hook;
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prev_planner_hook = planner_hook;
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planner_hook = delay_execution_planner;
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planner_hook = delay_execution_planner;
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}
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}
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/* Module unload function (pro forma, not used currently) */
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void
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_PG_fini(void)
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{
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planner_hook = prev_planner_hook;
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}
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@ -21,7 +21,6 @@
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PG_MODULE_MAGIC;
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PG_MODULE_MAGIC;
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void _PG_init(void);
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void _PG_init(void);
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void _PG_fini(void);
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static char *ssl_passphrase = NULL;
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static char *ssl_passphrase = NULL;
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@ -55,12 +54,6 @@ _PG_init(void)
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openssl_tls_init_hook = set_rot13;
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openssl_tls_init_hook = set_rot13;
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}
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}
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void
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_PG_fini(void)
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{
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/* do nothing yet */
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}
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static void
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static void
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set_rot13(SSL_CTX *context, bool isServerStart)
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set_rot13(SSL_CTX *context, bool isServerStart)
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{
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{
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@ -43,7 +43,7 @@ static bool REGRESS_userset_variable2 = false;
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static bool REGRESS_suset_variable1 = false;
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static bool REGRESS_suset_variable1 = false;
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static bool REGRESS_suset_variable2 = false;
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static bool REGRESS_suset_variable2 = false;
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/* Saved hook values in case of unload */
|
/* Saved hook values */
|
||||||
static object_access_hook_type next_object_access_hook = NULL;
|
static object_access_hook_type next_object_access_hook = NULL;
|
||||||
static object_access_hook_type_str next_object_access_hook_str = NULL;
|
static object_access_hook_type_str next_object_access_hook_str = NULL;
|
||||||
static ExecutorCheckPerms_hook_type next_exec_check_perms_hook = NULL;
|
static ExecutorCheckPerms_hook_type next_exec_check_perms_hook = NULL;
|
||||||
|
@ -70,10 +70,9 @@ static char *accesstype_arg_to_string(ObjectAccessType access, void *arg);
|
||||||
|
|
||||||
|
|
||||||
void _PG_init(void);
|
void _PG_init(void);
|
||||||
void _PG_fini(void);
|
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Module load/unload callback
|
* Module load callback
|
||||||
*/
|
*/
|
||||||
void
|
void
|
||||||
_PG_init(void)
|
_PG_init(void)
|
||||||
|
@ -231,23 +230,6 @@ _PG_init(void)
|
||||||
ProcessUtility_hook = REGRESS_utility_command;
|
ProcessUtility_hook = REGRESS_utility_command;
|
||||||
}
|
}
|
||||||
|
|
||||||
void
|
|
||||||
_PG_fini(void)
|
|
||||||
{
|
|
||||||
/* Unload hooks */
|
|
||||||
if (object_access_hook == REGRESS_object_access_hook)
|
|
||||||
object_access_hook = next_object_access_hook;
|
|
||||||
|
|
||||||
if (object_access_hook_str == REGRESS_object_access_hook_str)
|
|
||||||
object_access_hook_str = next_object_access_hook_str;
|
|
||||||
|
|
||||||
if (ExecutorCheckPerms_hook == REGRESS_exec_check_perms)
|
|
||||||
ExecutorCheckPerms_hook = next_exec_check_perms_hook;
|
|
||||||
|
|
||||||
if (ProcessUtility_hook == REGRESS_utility_command)
|
|
||||||
ProcessUtility_hook = next_ProcessUtility_hook;
|
|
||||||
}
|
|
||||||
|
|
||||||
static void
|
static void
|
||||||
emit_audit_message(const char *type, const char *hook, char *action, char *objName)
|
emit_audit_message(const char *type, const char *hook, char *action, char *objName)
|
||||||
{
|
{
|
||||||
|
|
|
@ -29,34 +29,17 @@
|
||||||
|
|
||||||
PG_MODULE_MAGIC;
|
PG_MODULE_MAGIC;
|
||||||
|
|
||||||
/* Saved hook values in case of unload */
|
|
||||||
static row_security_policy_hook_type prev_row_security_policy_hook_permissive = NULL;
|
|
||||||
static row_security_policy_hook_type prev_row_security_policy_hook_restrictive = NULL;
|
|
||||||
|
|
||||||
void _PG_init(void);
|
void _PG_init(void);
|
||||||
void _PG_fini(void);
|
|
||||||
|
|
||||||
/* Install hooks */
|
/* Install hooks */
|
||||||
void
|
void
|
||||||
_PG_init(void)
|
_PG_init(void)
|
||||||
{
|
{
|
||||||
/* Save values for unload */
|
|
||||||
prev_row_security_policy_hook_permissive = row_security_policy_hook_permissive;
|
|
||||||
prev_row_security_policy_hook_restrictive = row_security_policy_hook_restrictive;
|
|
||||||
|
|
||||||
/* Set our hooks */
|
/* Set our hooks */
|
||||||
row_security_policy_hook_permissive = test_rls_hooks_permissive;
|
row_security_policy_hook_permissive = test_rls_hooks_permissive;
|
||||||
row_security_policy_hook_restrictive = test_rls_hooks_restrictive;
|
row_security_policy_hook_restrictive = test_rls_hooks_restrictive;
|
||||||
}
|
}
|
||||||
|
|
||||||
/* Uninstall hooks */
|
|
||||||
void
|
|
||||||
_PG_fini(void)
|
|
||||||
{
|
|
||||||
row_security_policy_hook_permissive = prev_row_security_policy_hook_permissive;
|
|
||||||
row_security_policy_hook_restrictive = prev_row_security_policy_hook_restrictive;
|
|
||||||
}
|
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Return permissive policies to be added
|
* Return permissive policies to be added
|
||||||
*/
|
*/
|
||||||
|
|
Loading…
Reference in New Issue