1 /*****************************************************************************
2 * modules.c : Builtin and plugin modules management functions
3 *****************************************************************************
4 * Copyright (C) 2001 VideoLAN
5 * $Id: modules.c,v 1.75 2002/07/31 20:56:53 sam Exp $
7 * Authors: Samuel Hocevar <sam@zoy.org>
8 * Ethan C. Baldridge <BaldridgeE@cadmus.com>
9 * Hans-Peter Jansen <hpj@urpla.net>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
24 *****************************************************************************/
26 /* Some faulty libcs have a broken struct dirent when _FILE_OFFSET_BITS
27 * is set to 64. Don't try to be cleverer. */
28 #ifdef _FILE_OFFSET_BITS
29 #undef _FILE_OFFSET_BITS
32 #include <stdlib.h> /* free(), strtol() */
33 #include <stdio.h> /* sprintf() */
34 #include <string.h> /* strdup() */
40 #if defined(HAVE_DLFCN_H) /* Linux, BSD, Hurd */
41 # include <dlfcn.h> /* dlopen(), dlsym(), dlclose() */
42 # define HAVE_DYNAMIC_PLUGINS
43 #elif defined(HAVE_IMAGE_H) /* BeOS */
45 # define HAVE_DYNAMIC_PLUGINS
47 # define HAVE_DYNAMIC_PLUGINS
49 # undef HAVE_DYNAMIC_PLUGINS
55 #include "interface.h"
56 #include "vlc_playlist.h"
57 #include "intf_eject.h"
59 #include "stream_control.h"
60 #include "input_ext-intf.h"
61 #include "input_ext-dec.h"
62 #include "input_ext-plugins.h"
65 #include "video_output.h"
67 #include "audio_output.h"
71 #ifdef HAVE_DYNAMIC_PLUGINS
72 # include "modules_plugin.h"
75 #if !defined( _MSC_VER )
76 # include "modules_builtin.h"
78 # include "modules_builtin_msvc.h"
81 /*****************************************************************************
83 *****************************************************************************/
84 #ifdef HAVE_DYNAMIC_PLUGINS
85 static void AllocateAllPlugins ( vlc_object_t * );
86 static int AllocatePluginModule ( vlc_object_t *, char * );
88 static int AllocateBuiltinModule( vlc_object_t *, int ( * ) ( module_t * ) );
89 static int DeleteModule ( module_t * );
90 static int LockModule ( module_t * );
91 static int UnlockModule ( module_t * );
92 #ifdef HAVE_DYNAMIC_PLUGINS
93 static int HideModule ( module_t * );
94 static void DupModule ( module_t * );
95 static void UndupModule ( module_t * );
96 static int CallEntry ( module_t * );
99 /*****************************************************************************
100 * module_InitBank: create the module bank.
101 *****************************************************************************
102 * This function creates a module bank structure which will be filled later
103 * on with all the modules found.
104 *****************************************************************************/
105 void __module_InitBank( vlc_object_t *p_this )
107 module_bank_t *p_bank;
109 p_bank = vlc_object_create( p_this, sizeof(module_bank_t) );
110 p_bank->psz_object_name = "module bank";
112 p_bank->first = NULL;
114 vlc_mutex_init( p_this, &p_bank->lock );
117 * Store the symbols to be exported
119 #ifdef HAVE_DYNAMIC_PLUGINS
120 STORE_SYMBOLS( &p_bank->symbols );
123 /* Everything worked, attach the object */
124 p_this->p_vlc->p_module_bank = p_bank;
125 vlc_object_attach( p_bank, p_this->p_vlc );
130 /*****************************************************************************
131 * module_ResetBank: reset the module bank.
132 *****************************************************************************
133 * This function resets the module bank by unloading all unused plugin
135 *****************************************************************************/
136 void __module_ResetBank( vlc_object_t *p_this )
138 msg_Err( p_this, "FIXME: module_ResetBank unimplemented" );
142 /*****************************************************************************
143 * module_EndBank: empty the module bank.
144 *****************************************************************************
145 * This function unloads all unused plugin modules and empties the module
146 * bank in case of success.
147 *****************************************************************************/
148 void __module_EndBank( vlc_object_t *p_this )
152 vlc_object_detach_all( p_this->p_vlc->p_module_bank );
154 while( p_this->p_vlc->p_module_bank->first != NULL )
156 if( DeleteModule( p_this->p_vlc->p_module_bank->first ) )
158 /* Module deletion failed */
159 msg_Err( p_this, "module \"%s\" can't be removed, trying harder",
160 p_this->p_vlc->p_module_bank->first->psz_object_name );
162 /* We just free the module by hand. Niahahahahaha. */
163 p_next = p_this->p_vlc->p_module_bank->first->next;
164 free( p_this->p_vlc->p_module_bank->first );
165 p_this->p_vlc->p_module_bank->first = p_next;
169 /* Destroy the lock */
170 vlc_mutex_destroy( &p_this->p_vlc->p_module_bank->lock );
172 vlc_object_destroy( p_this->p_vlc->p_module_bank );
177 /*****************************************************************************
178 * module_LoadMain: load the main program info into the module bank.
179 *****************************************************************************
180 * This function fills the module bank structure with the main module infos.
181 * This is very useful as it will allow us to consider the main program just
182 * as another module, and for instance the configuration options of main will
183 * be available in the module bank structure just as for every other module.
184 *****************************************************************************/
185 void __module_LoadMain( vlc_object_t *p_this )
187 AllocateBuiltinModule( p_this, vlc_entry__main );
190 /*****************************************************************************
191 * module_LoadBuiltins: load all modules which we built with.
192 *****************************************************************************
193 * This function fills the module bank structure with the builtin modules.
194 *****************************************************************************/
195 void __module_LoadBuiltins( vlc_object_t * p_this )
197 msg_Dbg( p_this, "checking builtin modules" );
198 ALLOCATE_ALL_BUILTINS();
201 /*****************************************************************************
202 * module_LoadPlugins: load all plugin modules we can find.
203 *****************************************************************************
204 * This function fills the module bank structure with the plugin modules.
205 *****************************************************************************/
206 void __module_LoadPlugins( vlc_object_t * p_this )
208 #ifdef HAVE_DYNAMIC_PLUGINS
209 msg_Dbg( p_this, "checking plugin modules" );
210 AllocateAllPlugins( p_this );
214 /*****************************************************************************
215 * module_ManageBank: manage the module bank.
216 *****************************************************************************
217 * This function parses the module bank and hides modules that have been
218 * unused for a while.
219 *****************************************************************************/
220 void __module_ManageBank( vlc_object_t *p_this )
222 #ifdef HAVE_DYNAMIC_PLUGINS
225 /* We take the global lock */
226 vlc_mutex_lock( &p_this->p_vlc->p_module_bank->lock );
228 /* Parse the module list to see if any modules need to be unloaded */
229 for( p_module = p_this->p_vlc->p_module_bank->first ;
231 p_module = p_module->next )
233 /* If the module is unused and if it is a plugin module... */
234 if( p_module->i_usage == 0 && !p_module->b_builtin )
236 if( p_module->i_unused_delay < MODULE_HIDE_DELAY )
238 p_module->i_unused_delay++;
242 msg_Dbg( p_this, "hiding unused plugin module \"%s\"",
243 p_module->psz_object_name );
244 HideModule( p_module );
246 /* Break here, so that we only hide one module at a time */
252 /* We release the global lock */
253 vlc_mutex_unlock( &p_this->p_vlc->p_module_bank->lock );
254 #endif /* HAVE_DYNAMIC_PLUGINS */
259 /*****************************************************************************
260 * module_Need: return the best module function, given a capability list.
261 *****************************************************************************
262 * This function returns the module that best fits the asked capabilities.
263 *****************************************************************************/
264 module_t * __module_Need( vlc_object_t *p_this, const char *psz_capability,
265 const char *psz_name )
267 typedef struct module_list_t module_list_t;
273 module_list_t *p_next;
276 module_list_t *p_list, *p_first, *p_tmp;
279 vlc_bool_t b_intf = VLC_FALSE;
284 char *psz_shortcuts = NULL;
286 msg_Dbg( p_this, "looking for %s module", psz_capability );
288 /* Count how many different shortcuts were asked for */
289 if( psz_name && *psz_name )
293 /* If the user wants none, give him none. */
294 if( !strcmp( psz_name, "none" ) )
300 psz_shortcuts = strdup( psz_name );
302 for( psz_parser = psz_shortcuts; *psz_parser; psz_parser++ )
304 if( *psz_parser == ',' )
312 /* We take the global lock */
313 vlc_mutex_lock( &p_this->p_vlc->p_module_bank->lock );
315 /* Sort the modules and test them */
316 p_list = malloc( p_this->p_vlc->p_module_bank->i_count
317 * sizeof( module_list_t ) );
320 /* Parse the module list for capabilities and probe each of them */
321 for( p_module = p_this->p_vlc->p_module_bank->first ;
323 p_module = p_module->next )
325 module_t * p_submodule = NULL;
326 int i_shortcut_bonus = 0, i_submodule;
328 /* Test that this module can do what we need */
329 if( strcmp( p_module->psz_capability, psz_capability ) )
331 for( i_submodule = 0;
332 i_submodule < p_module->i_children;
335 if( !strcmp( ((module_t*)p_module->pp_children[ i_submodule ])
336 ->psz_capability, psz_capability ) )
339 (module_t*)p_module->pp_children[ i_submodule ];
340 p_submodule->next = p_module->next;
345 if( p_submodule == NULL )
350 p_module = p_submodule;
353 /* Test if we have the required CPU */
354 if( (p_module->i_cpu & p_this->p_vlc->i_cpu) != p_module->i_cpu )
359 /* If we required a shortcut, check this plugin provides it. */
362 vlc_bool_t b_trash = VLC_TRUE;
363 int i_dummy, i_short = i_shortcuts;
364 char *psz_name = psz_shortcuts;
369 b_trash && p_module->pp_shortcuts[i_dummy];
372 b_trash = ( strcmp(psz_name, "any") || !p_module->i_score )
373 && strcmp( psz_name, p_module->pp_shortcuts[i_dummy] );
378 i_shortcut_bonus = i_short * 10000;
382 /* Go to the next shortcut... This is so lame! */
396 /* If we didn't require a shortcut, trash zero-scored plugins */
397 else if( !p_module->i_score )
402 /* Special case: test if we requested a particular intf plugin */
403 if( p_module->psz_program
404 && !strcmp( p_module->psz_program,
405 p_this->p_vlc->psz_object_name ) )
409 /* Remove previous non-matching plugins */
416 /* This one doesn't match */
420 /* Store this new module */
421 p_list[ i_index ].p_module = p_module;
422 p_list[ i_index ].i_score = p_module->i_score + i_shortcut_bonus;
424 /* Add it to the modules-to-probe list */
427 p_list[ 0 ].p_next = NULL;
432 /* Ok, so at school you learned that quicksort is quick, and
433 * bubble sort sucks raw eggs. But that's when dealing with
434 * thousands of items. Here we have barely 50. */
435 module_list_t *p_newlist = p_first;
437 if( p_first->i_score < p_list[ i_index ].i_score )
439 p_list[ i_index ].p_next = p_first;
440 p_first = &p_list[ i_index ];
444 while( p_newlist->p_next != NULL &&
445 p_newlist->p_next->i_score >= p_list[ i_index ].i_score )
447 p_newlist = p_newlist->p_next;
450 p_list[ i_index ].p_next = p_newlist->p_next;
451 p_newlist->p_next = &p_list[ i_index ];
458 msg_Dbg( p_this, "probing %i candidate%s",
459 i_index, i_index == 1 ? "" : "s" );
461 /* Lock all selected modules */
463 while( p_tmp != NULL )
465 LockModule( p_tmp->p_module );
466 p_tmp = p_tmp->p_next;
469 /* We can release the global lock, module refcounts were incremented */
470 vlc_mutex_unlock( &p_this->p_vlc->p_module_bank->lock );
472 /* Parse the linked list and use the first successful module */
474 while( p_tmp != NULL )
476 if( p_tmp->p_module->pf_activate
477 && p_tmp->p_module->pf_activate( p_this ) == VLC_SUCCESS )
482 UnlockModule( p_tmp->p_module );
483 p_tmp = p_tmp->p_next;
486 /* Store the locked module value */
489 p_module = p_tmp->p_module;
490 p_tmp = p_tmp->p_next;
497 /* Unlock the remaining modules */
498 while( p_tmp != NULL )
500 UnlockModule( p_tmp->p_module );
501 p_tmp = p_tmp->p_next;
506 if( p_module != NULL )
508 msg_Info( p_module, "using %s module \"%s\"",
509 psz_capability, p_module->psz_object_name );
511 else if( p_first == NULL )
513 msg_Err( p_this, "no %s module matched \"%s\"",
514 psz_capability, (psz_name && *psz_name) ? psz_name : "any" );
516 else if( psz_name != NULL && *psz_name )
518 msg_Err( p_this, "no %s module matching \"%s\" could be loaded",
519 psz_capability, (psz_name && *psz_name) ? psz_name : "any" );
524 free( psz_shortcuts );
527 /* Don't forget that the module is still locked */
531 /*****************************************************************************
532 * module_Unneed: decrease the usage count of a module.
533 *****************************************************************************
534 * This function must be called by the thread that called module_Need, to
535 * decrease the reference count and allow for hiding of modules.
536 *****************************************************************************/
537 void __module_Unneed( vlc_object_t * p_this, module_t * p_module )
539 /* Use the close method */
540 if( p_module->pf_deactivate )
542 p_module->pf_deactivate( p_this );
545 /* We take the global lock */
546 vlc_mutex_lock( &p_module->p_vlc->p_module_bank->lock );
548 /* Just unlock the module - we can't do anything if it fails,
549 * so there is no need to check the return value. */
550 UnlockModule( p_module );
552 msg_Info( p_module, "unlocking module \"%s\"", p_module->psz_object_name );
554 /* We release the global lock */
555 vlc_mutex_unlock( &p_module->p_vlc->p_module_bank->lock );
560 /*****************************************************************************
561 * Following functions are local.
562 *****************************************************************************/
564 /*****************************************************************************
565 * AllocateAllPlugins: load all plugin modules we can find.
566 *****************************************************************************/
567 #ifdef HAVE_DYNAMIC_PLUGINS
568 static void AllocateAllPlugins( vlc_object_t *p_this )
570 /* Yes, there are two NULLs because we replace one with "plugin-path". */
571 char * path[] = { "plugins", PLUGIN_PATH, NULL, NULL };
573 char ** ppsz_path = path;
576 #if defined( SYS_BEOS ) || defined( SYS_DARWIN )
577 char * psz_vlcpath = system_GetProgramPath();
578 int i_vlclen = strlen( psz_vlcpath );
579 vlc_bool_t b_notinroot;
582 struct dirent * file;
584 /* If the user provided a plugin path, we add it to the list */
585 path[ sizeof(path)/sizeof(char*) - 2 ] = config_GetPsz( p_this,
588 for( ; *ppsz_path != NULL ; ppsz_path++ )
590 /* Store strlen(*ppsz_path) for later use. */
591 int i_dirlen = strlen( *ppsz_path );
593 #if defined( SYS_BEOS ) || defined( SYS_DARWIN )
594 b_notinroot = VLC_FALSE;
595 /* Under BeOS, we need to add beos_GetProgramPath() to access
596 * files under the current directory */
597 if( ( i_dirlen > 1 ) && strncmp( *ppsz_path, "/", 1 ) )
599 i_dirlen += i_vlclen + 2;
600 b_notinroot = VLC_TRUE;
602 psz_fullpath = malloc( i_dirlen );
603 if( psz_fullpath == NULL )
607 sprintf( psz_fullpath, "%s/%s", psz_vlcpath, *ppsz_path );
612 psz_fullpath = *ppsz_path;
615 msg_Dbg( p_this, "browsing `%s'", psz_fullpath );
617 if( (dir = opendir( psz_fullpath )) )
619 /* Parse the directory and try to load all files it contains. */
620 while( (file = readdir( dir )) )
622 int i_filelen = strlen( file->d_name );
624 /* We only load files ending with ".so" */
626 && !strncmp( file->d_name + i_filelen - 3, ".so", 3 ) )
628 psz_file = malloc( i_dirlen + i_filelen + 2 );
629 if( psz_file == NULL )
633 sprintf( psz_file, "%s/%s", psz_fullpath, file->d_name );
635 /* We created a nice filename -- now we just try to load
636 * it as a plugin module. */
637 AllocatePluginModule( p_this, psz_file );
639 /* We don't care if the allocation succeeded */
644 /* Close the directory if successfully opened */
648 #if defined( SYS_BEOS ) || defined( SYS_DARWIN )
651 free( psz_fullpath );
657 /*****************************************************************************
658 * AllocatePluginModule: load a module into memory and initialize it.
659 *****************************************************************************
660 * This function loads a dynamically loadable module and allocates a structure
661 * for its information data. The module can then be handled by module_Need,
662 * module_Unneed and HideModule. It can be removed by DeleteModule.
663 *****************************************************************************/
664 static int AllocatePluginModule( vlc_object_t * p_this, char * psz_filename )
667 module_handle_t handle;
669 /* Try to dynamically load the module. */
670 if( module_load( psz_filename, &handle ) )
672 char psz_buffer[256];
674 /* The plugin module couldn't be opened */
675 msg_Warn( p_this, "cannot open `%s' (%s)",
676 psz_filename, module_error( psz_buffer ) );
680 /* Now that we have successfully loaded the module, we can
681 * allocate a structure for it */
682 p_module = vlc_object_create( p_this, VLC_OBJECT_MODULE );
683 if( p_module == NULL )
685 msg_Err( p_this, "out of memory" );
686 module_unload( handle );
690 /* We need to fill these since they may be needed by CallEntry() */
691 p_module->psz_filename = psz_filename;
692 p_module->handle = handle;
693 p_module->p_symbols = &p_this->p_vlc->p_module_bank->symbols;
695 /* Initialize the module: fill p_module->psz_object_name, default config */
696 if( CallEntry( p_module ) != 0 )
698 /* We couldn't call module_init() */
699 vlc_object_destroy( p_module );
700 module_unload( handle );
704 DupModule( p_module );
705 p_module->psz_filename = strdup( p_module->psz_filename );
706 p_module->psz_longname = strdup( p_module->psz_longname );
708 /* Everything worked fine ! The module is ready to be added to the list. */
709 p_module->i_usage = 0;
710 p_module->i_unused_delay = 0;
712 p_module->b_builtin = VLC_FALSE;
714 /* Link module into the linked list */
715 if( p_this->p_vlc->p_module_bank->first != NULL )
717 p_this->p_vlc->p_module_bank->first->prev = p_module;
719 p_module->next = p_this->p_vlc->p_module_bank->first;
720 p_module->prev = NULL;
721 p_this->p_vlc->p_module_bank->first = p_module;
722 p_this->p_vlc->p_module_bank->i_count++;
724 msg_Dbg( p_this, "plugin \"%s\", %s",
725 p_module->psz_object_name, p_module->psz_longname );
727 vlc_object_attach( p_module, p_this->p_vlc->p_module_bank );
732 /*****************************************************************************
733 * DupModule: make a plugin module standalone.
734 *****************************************************************************
735 * This function duplicates all strings in the module, so that the dynamic
736 * object can be unloaded. It acts recursively on submodules.
737 *****************************************************************************/
738 static void DupModule( module_t *p_module )
743 for( pp_shortcut = p_module->pp_shortcuts ; *pp_shortcut ; pp_shortcut++ )
745 *pp_shortcut = strdup( *pp_shortcut );
748 /* We strdup() these entries so that they are still valid when the
749 * module is unloaded. */
750 p_module->psz_object_name = strdup( p_module->psz_object_name );
751 p_module->psz_capability = strdup( p_module->psz_capability );
753 if( p_module->psz_program != NULL )
755 p_module->psz_program = strdup( p_module->psz_program );
758 for( i_submodule = 0; i_submodule < p_module->i_children; i_submodule++ )
760 DupModule( (module_t*)p_module->pp_children[ i_submodule ] );
764 /*****************************************************************************
765 * UndupModule: free a duplicated module.
766 *****************************************************************************
767 * This function frees the allocations done in DupModule().
768 *****************************************************************************/
769 static void UndupModule( module_t *p_module )
774 for( i_submodule = 0; i_submodule < p_module->i_children; i_submodule++ )
776 UndupModule( (module_t*)p_module->pp_children[ i_submodule ] );
779 for( pp_shortcut = p_module->pp_shortcuts ; *pp_shortcut ; pp_shortcut++ )
781 free( *pp_shortcut );
784 free( p_module->psz_object_name );
785 free( p_module->psz_capability );
787 if( p_module->psz_program != NULL )
789 free( p_module->psz_program );
793 #endif /* HAVE_DYNAMIC_PLUGINS */
795 /*****************************************************************************
796 * AllocateBuiltinModule: initialize a builtin module.
797 *****************************************************************************
798 * This function registers a builtin module and allocates a structure
799 * for its information data. The module can then be handled by module_Need,
800 * module_Unneed and HideModule. It can be removed by DeleteModule.
801 *****************************************************************************/
802 static int AllocateBuiltinModule( vlc_object_t * p_this,
803 int ( *pf_entry ) ( module_t * ) )
807 /* Now that we have successfully loaded the module, we can
808 * allocate a structure for it */
809 p_module = vlc_object_create( p_this, VLC_OBJECT_MODULE );
810 if( p_module == NULL )
812 msg_Err( p_this, "out of memory" );
816 /* Initialize the module : fill p_module->psz_object_name, etc. */
817 if( pf_entry( p_module ) != 0 )
819 /* With a well-written module we shouldn't have to print an
820 * additional error message here, but just make sure. */
821 msg_Err( p_this, "failed calling entry point in builtin module" );
822 vlc_object_destroy( p_module );
826 /* Everything worked fine ! The module is ready to be added to the list. */
827 p_module->i_usage = 0;
828 p_module->i_unused_delay = 0;
830 p_module->b_builtin = VLC_TRUE;
832 /* Link module into the linked list */
833 if( p_this->p_vlc->p_module_bank->first != NULL )
835 p_this->p_vlc->p_module_bank->first->prev = p_module;
837 p_module->next = p_this->p_vlc->p_module_bank->first;
838 p_module->prev = NULL;
839 p_this->p_vlc->p_module_bank->first = p_module;
840 p_this->p_vlc->p_module_bank->i_count++;
842 msg_Dbg( p_this, "builtin \"%s\", %s",
843 p_module->psz_object_name, p_module->psz_longname );
845 vlc_object_attach( p_module, p_this->p_vlc->p_module_bank );
850 /*****************************************************************************
851 * DeleteModule: delete a module and its structure.
852 *****************************************************************************
853 * This function can only be called if i_usage <= 0.
854 *****************************************************************************/
855 static int DeleteModule( module_t * p_module )
857 /* If the module is not in use but is still in memory, we first have
858 * to hide it and remove it from memory before we can free the
860 if( p_module->b_builtin )
862 if( p_module->i_usage != 0 )
864 msg_Err( p_module, "trying to free builtin module \"%s\" with "
865 "usage %i", p_module->psz_object_name, p_module->i_usage );
869 #ifdef HAVE_DYNAMIC_PLUGINS
872 if( p_module->i_usage >= 1 )
874 msg_Err( p_module, "trying to free module \"%s\" which is "
875 "still in use", p_module->psz_object_name );
879 /* Two possibilities here: i_usage == -1 and the module is already
880 * unloaded, we can continue, or i_usage == 0, and we have to hide
881 * the module before going on. */
882 if( p_module->i_usage == 0 )
884 if( HideModule( p_module ) != 0 )
892 vlc_object_detach_all( p_module );
894 /* Unlink the module from the linked list. */
895 if( p_module->prev != NULL )
897 p_module->prev->next = p_module->next;
901 p_module->p_vlc->p_module_bank->first = p_module->next;
904 if( p_module->next != NULL )
906 p_module->next->prev = p_module->prev;
909 p_module->p_vlc->p_module_bank->i_count--;
911 /* We free the structures that we strdup()ed in Allocate*Module(). */
912 #ifdef HAVE_DYNAMIC_PLUGINS
913 if( !p_module->b_builtin )
915 UndupModule( p_module );
916 free( p_module->psz_filename );
917 free( p_module->psz_longname );
921 /* Free and detach the object's children */
922 while( p_module->i_children )
924 vlc_object_t *p_this = p_module->pp_children[0];
925 vlc_object_detach_all( p_this );
926 vlc_object_destroy( p_this );
929 config_Free( p_module );
930 vlc_object_destroy( p_module );
935 /*****************************************************************************
936 * LockModule: increase the usage count of a module and load it if needed.
937 *****************************************************************************
938 * This function has to be called before a thread starts using a module. If
939 * the module is already loaded, we just increase its usage count. If it isn't
940 * loaded, we have to dynamically open it and initialize it.
941 * If you successfully call LockModule() at any moment, be careful to call
942 * UnlockModule() when you don't need it anymore.
943 *****************************************************************************/
944 static int LockModule( module_t * p_module )
946 if( p_module->i_usage >= 0 )
948 /* This module is already loaded and activated, we can return */
953 if( p_module->b_builtin )
955 /* A builtin module should always have a refcount >= 0 ! */
956 msg_Err( p_module, "builtin module \"%s\" has refcount %i",
957 p_module->psz_object_name, p_module->i_usage );
961 #ifdef HAVE_DYNAMIC_PLUGINS
962 if( p_module->i_usage != -1 )
964 /* This shouldn't happen. Ever. We have serious problems here. */
965 msg_Err( p_module, "plugin module \"%s\" has refcount %i",
966 p_module->psz_object_name, p_module->i_usage );
970 /* i_usage == -1, which means that the module isn't in memory */
971 if( module_load( p_module->psz_filename, &p_module->handle ) )
973 char psz_buffer[256];
975 /* The plugin module couldn't be opened */
976 msg_Err( p_module, "cannot open `%s' (%s)",
977 p_module->psz_filename, module_error(psz_buffer) );
981 /* FIXME: what to do if the guy modified the plugin while it was
982 * unloaded ? It makes XMMS crash nastily, perhaps we should try
983 * to be a bit more clever here. */
985 /* Everything worked fine ! The module is ready to be used */
986 p_module->i_usage = 1;
987 #endif /* HAVE_DYNAMIC_PLUGINS */
992 /*****************************************************************************
993 * UnlockModule: decrease the usage count of a module.
994 *****************************************************************************
995 * We decrease the usage count of a module so that we know when a module
996 * becomes unused and can be hidden.
997 *****************************************************************************/
998 static int UnlockModule( module_t * p_module )
1000 if( p_module->i_usage <= 0 )
1002 /* This shouldn't happen. Ever. We have serious problems here. */
1003 msg_Err( p_module, "trying to call module_Unneed() on \"%s\" "
1004 "which is not in use", p_module->psz_object_name );
1008 /* This module is still in use, we can return */
1009 p_module->i_usage--;
1010 p_module->i_unused_delay = 0;
1015 #ifdef HAVE_DYNAMIC_PLUGINS
1016 /*****************************************************************************
1017 * HideModule: remove a module from memory but keep its structure.
1018 *****************************************************************************
1019 * This function can only be called if i_usage == 0. It will make a call
1020 * to the module's inner module_deactivate() symbol, and then unload it
1021 * from memory. A call to module_Need() will automagically load it again.
1022 *****************************************************************************/
1023 static int HideModule( module_t * p_module )
1025 if( p_module->b_builtin )
1027 /* A builtin module should never be hidden. */
1028 msg_Err( p_module, "trying to hide builtin module \"%s\"",
1029 p_module->psz_object_name );
1033 if( p_module->i_usage >= 1 )
1035 msg_Err( p_module, "trying to hide module \"%s\" which is still "
1036 "in use", p_module->psz_object_name );
1040 if( p_module->i_usage <= -1 )
1042 msg_Err( p_module, "trying to hide module \"%s\" which is already "
1043 "hidden", p_module->psz_object_name );
1047 /* Everything worked fine, we can safely unload the module. */
1048 module_unload( p_module->handle );
1049 p_module->i_usage = -1;
1054 /*****************************************************************************
1055 * CallEntry: call an entry point.
1056 *****************************************************************************
1057 * This function calls a symbol given its name and a module structure. The
1058 * symbol MUST refer to a function returning int and taking a module_t* as
1060 *****************************************************************************/
1061 static int CallEntry( module_t * p_module )
1063 static char *psz_name = "vlc_entry" MODULE_SUFFIX;
1064 int (* pf_symbol) ( module_t * p_module );
1066 /* Try to resolve the symbol */
1067 pf_symbol = module_getsymbol( p_module->handle, psz_name );
1069 if( pf_symbol == NULL )
1071 char psz_buffer[256];
1073 /* We couldn't load the symbol */
1074 msg_Warn( p_module, "cannot find symbol \"%s\" in file `%s' (%s)",
1075 psz_name, p_module->psz_filename,
1076 module_error( psz_buffer ) );
1080 /* We can now try to call the symbol */
1081 if( pf_symbol( p_module ) != 0 )
1083 /* With a well-written module we shouldn't have to print an
1084 * additional error message here, but just make sure. */
1085 msg_Err( p_module, "failed calling symbol \"%s\" in file `%s'",
1086 psz_name, p_module->psz_filename );
1090 /* Everything worked fine, we can return */
1093 #endif /* HAVE_DYNAMIC_PLUGINS */