@ -37,9 +37,8 @@
# include "utils/hsearch.h"
/* signatures for PostgreSQL-specific library init/fini functions */
/* signature for PostgreSQL-specific library init function */
typedef void ( * PG_init_t ) ( void ) ;
typedef void ( * PG_fini_t ) ( void ) ;
/* hashtable entry for rendezvous variables */
typedef struct
@ -79,7 +78,6 @@ char *Dynamic_library_path;
static void * internal_load_library ( const char * libname ) ;
static void incompatible_module_error ( const char * libname ,
const Pg_magic_struct * module_magic_data ) pg_attribute_noreturn ( ) ;
static void internal_unload_library ( const char * libname ) ;
static bool file_exists ( const char * name ) ;
static char * expand_dynamic_library_name ( const char * name ) ;
static void check_restricted_library_name ( const char * name ) ;
@ -154,9 +152,6 @@ load_file(const char *filename, bool restricted)
/* Expand the possibly-abbreviated filename to an exact path name */
fullname = expand_dynamic_library_name ( filename ) ;
/* Unload the library if currently loaded */
internal_unload_library ( fullname ) ;
/* Load the shared library */
( void ) internal_load_library ( fullname ) ;
@ -179,6 +174,11 @@ lookup_external_function(void *filehandle, const char *funcname)
* loaded . Return the pg_dl * handle for the file .
*
* Note : libname is expected to be an exact name for the library file .
*
* NB : There is presently no way to unload a dynamically loaded file . We might
* add one someday if we can convince ourselves we have safe protocols for un -
* hooking from hook function pointers , releasing custom GUC variables , and
* perhaps other things that are definitely unsafe currently .
*/
static void *
internal_load_library ( const char * libname )
@ -400,71 +400,6 @@ incompatible_module_error(const char *libname,
errdetail_internal ( " %s " , details . data ) ) ) ;
}
/*
* Unload the specified dynamic - link library file , if it is loaded .
*
* Note : libname is expected to be an exact name for the library file .
*
* XXX for the moment , this is disabled , resulting in LOAD of an already - loaded
* library always being a no - op . We might re - enable it someday if we can
* convince ourselves we have safe protocols for un - hooking from hook function
* pointers , releasing custom GUC variables , and perhaps other things that
* are definitely unsafe currently .
*/
static void
internal_unload_library ( const char * libname )
{
# ifdef NOT_USED
DynamicFileList * file_scanner ,
* prv ,
* nxt ;
struct stat stat_buf ;
PG_fini_t PG_fini ;
/*
* We need to do stat ( ) in order to determine whether this is the same
* file as a previously loaded file ; it ' s also handy so as to give a good
* error message if bogus file name given .
*/
if ( stat ( libname , & stat_buf ) = = - 1 )
ereport ( ERROR ,
( errcode_for_file_access ( ) ,
errmsg ( " could not access file \" %s \" : %m " , libname ) ) ) ;
/*
* We have to zap all entries in the list that match on either filename or
* inode , else internal_load_library ( ) will still think it ' s present .
*/
prv = NULL ;
for ( file_scanner = file_list ; file_scanner ! = NULL ; file_scanner = nxt )
{
nxt = file_scanner - > next ;
if ( strcmp ( libname , file_scanner - > filename ) = = 0 | |
SAME_INODE ( stat_buf , * file_scanner ) )
{
if ( prv )
prv - > next = nxt ;
else
file_list = nxt ;
/*
* If the library has a _PG_fini ( ) function , call it .
*/
PG_fini = ( PG_fini_t ) dlsym ( file_scanner - > handle , " _PG_fini " ) ;
if ( PG_fini )
( * PG_fini ) ( ) ;
clear_external_function_hash ( file_scanner - > handle ) ;
dlclose ( file_scanner - > handle ) ;
free ( ( char * ) file_scanner ) ;
/* prv does not change */
}
else
prv = file_scanner ;
}
# endif /* NOT_USED */
}
static bool
file_exists ( const char * name )
{
Robert Haas
3 years ago