1 /*****************************************************************************
2 * modules.c : Builtin and plugin modules management functions
3 *****************************************************************************
4 * Copyright (C) 2001 VideoLAN
5 * $Id: modules.c,v 1.107 2002/11/19 17:38:07 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 #elif defined( UNDER_CE )
41 # include <windows.h> /* GetFileAttributes() */
43 # include "../extras/dirent.h"
46 #ifdef HAVE_SYS_TYPES_H
47 # include <sys/types.h>
49 #ifdef HAVE_SYS_STAT_H
50 # include <sys/stat.h>
56 #if defined(HAVE_DLFCN_H) /* Linux, BSD, Hurd */
57 # include <dlfcn.h> /* dlopen(), dlsym(), dlclose() */
58 # define HAVE_DYNAMIC_PLUGINS
59 #elif defined(HAVE_IMAGE_H) /* BeOS */
61 # define HAVE_DYNAMIC_PLUGINS
62 #elif defined(UNDER_CE)
63 # define HAVE_DYNAMIC_PLUGINS
65 # define HAVE_DYNAMIC_PLUGINS
67 # undef HAVE_DYNAMIC_PLUGINS
73 #include "interface.h"
74 #include "vlc_playlist.h"
75 #include "intf_eject.h"
77 #include "stream_control.h"
78 #include "input_ext-intf.h"
79 #include "input_ext-dec.h"
80 #include "input_ext-plugins.h"
83 #include "video_output.h"
85 #include "audio_output.h"
86 #include "aout_internal.h"
88 #include "stream_output.h"
92 #if defined( UNDER_CE )
93 # define MYCHAR wchar_t
98 #ifdef HAVE_DYNAMIC_PLUGINS
99 # include "modules_plugin.h"
102 #if defined( UNDER_CE )
103 # include "modules_builtin_evc.h"
104 #elif defined( _MSC_VER )
105 # include "modules_builtin_msvc.h"
107 # include "modules_builtin.h"
110 /*****************************************************************************
112 *****************************************************************************/
113 #ifdef HAVE_DYNAMIC_PLUGINS
114 static void AllocateAllPlugins ( vlc_object_t * );
115 static void AllocatePluginDir ( vlc_object_t *, const MYCHAR *, int );
116 static int AllocatePluginFile ( vlc_object_t *, MYCHAR * );
118 static int AllocateBuiltinModule( vlc_object_t *, int ( * ) ( module_t * ) );
119 static int DeleteModule ( module_t * );
120 #ifdef HAVE_DYNAMIC_PLUGINS
121 static void DupModule ( module_t * );
122 static void UndupModule ( module_t * );
123 static int CallEntry ( module_t * );
126 /*****************************************************************************
127 * module_InitBank: create the module bank.
128 *****************************************************************************
129 * This function creates a module bank structure which will be filled later
130 * on with all the modules found.
131 *****************************************************************************/
132 void __module_InitBank( vlc_object_t *p_this )
134 module_bank_t *p_bank;
136 p_bank = vlc_object_create( p_this, sizeof(module_bank_t) );
137 p_bank->psz_object_name = "module bank";
140 * Store the symbols to be exported
142 #ifdef HAVE_DYNAMIC_PLUGINS
143 STORE_SYMBOLS( &p_bank->symbols );
146 /* Everything worked, attach the object */
147 p_this->p_libvlc->p_module_bank = p_bank;
148 vlc_object_attach( p_bank, p_this->p_libvlc );
153 /*****************************************************************************
154 * module_ResetBank: reset the module bank.
155 *****************************************************************************
156 * This function resets the module bank by unloading all unused plugin
158 *****************************************************************************/
159 void __module_ResetBank( vlc_object_t *p_this )
161 msg_Err( p_this, "FIXME: module_ResetBank unimplemented" );
165 /*****************************************************************************
166 * module_EndBank: empty the module bank.
167 *****************************************************************************
168 * This function unloads all unused plugin modules and empties the module
169 * bank in case of success.
170 *****************************************************************************/
171 void __module_EndBank( vlc_object_t *p_this )
175 vlc_object_detach( p_this->p_libvlc->p_module_bank );
177 while( p_this->p_libvlc->p_module_bank->i_children )
179 p_next = (module_t *)p_this->p_libvlc->p_module_bank->pp_children[0];
181 if( DeleteModule( p_next ) )
183 /* Module deletion failed */
184 msg_Err( p_this, "module \"%s\" can't be removed, trying harder",
185 p_next->psz_object_name );
187 /* We just free the module by hand. Niahahahahaha. */
188 vlc_object_detach( p_next );
189 vlc_object_destroy( p_next );
193 vlc_object_destroy( p_this->p_libvlc->p_module_bank );
198 /*****************************************************************************
199 * module_LoadMain: load the main program info into the module bank.
200 *****************************************************************************
201 * This function fills the module bank structure with the main module infos.
202 * This is very useful as it will allow us to consider the main program just
203 * as another module, and for instance the configuration options of main will
204 * be available in the module bank structure just as for every other module.
205 *****************************************************************************/
206 void __module_LoadMain( vlc_object_t *p_this )
208 AllocateBuiltinModule( p_this, vlc_entry__main );
211 /*****************************************************************************
212 * module_LoadBuiltins: load all modules which we built with.
213 *****************************************************************************
214 * This function fills the module bank structure with the builtin modules.
215 *****************************************************************************/
216 void __module_LoadBuiltins( vlc_object_t * p_this )
218 msg_Dbg( p_this, "checking builtin modules" );
219 ALLOCATE_ALL_BUILTINS();
222 /*****************************************************************************
223 * module_LoadPlugins: load all plugin modules we can find.
224 *****************************************************************************
225 * This function fills the module bank structure with the plugin modules.
226 *****************************************************************************/
227 void __module_LoadPlugins( vlc_object_t * p_this )
229 #ifdef HAVE_DYNAMIC_PLUGINS
230 msg_Dbg( p_this, "checking plugin modules" );
231 AllocateAllPlugins( p_this );
235 /*****************************************************************************
236 * module_Need: return the best module function, given a capability list.
237 *****************************************************************************
238 * This function returns the module that best fits the asked capabilities.
239 *****************************************************************************/
240 module_t * __module_Need( vlc_object_t *p_this, const char *psz_capability,
241 const char *psz_name )
243 typedef struct module_list_t module_list_t;
249 module_list_t *p_next;
252 module_list_t *p_list, *p_first, *p_tmp;
256 vlc_bool_t b_intf = VLC_FALSE;
259 module_t **pp_parser;
262 char *psz_shortcuts = NULL, *psz_var = NULL;
264 msg_Dbg( p_this, "looking for %s module", psz_capability );
266 /* Deal with variables */
267 if( psz_name && psz_name[0] == '$' )
269 psz_var = config_GetPsz( p_this, psz_name + 1 );
273 /* Count how many different shortcuts were asked for */
274 if( psz_name && *psz_name )
278 /* If the user wants none, give him none. */
279 if( !strcmp( psz_name, "none" ) )
281 if( psz_var ) free( psz_var );
286 psz_shortcuts = strdup( psz_name );
288 for( psz_parser = psz_shortcuts; *psz_parser; psz_parser++ )
290 if( *psz_parser == ',' )
298 /* Sort the modules and test them */
299 p_all = vlc_list_find( p_this, VLC_OBJECT_MODULE, FIND_ANYWHERE );
300 p_list = malloc( p_all->i_count * sizeof( module_list_t ) );
303 /* Parse the module list for capabilities and probe each of them */
304 for( pp_parser = (module_t**)p_all->pp_objects ; *pp_parser ; pp_parser++ )
306 module_t * p_submodule = NULL;
307 int i_shortcut_bonus = 0, i_submodule;
309 p_module = *pp_parser;
311 /* Test that this module can do what we need */
312 if( strcmp( p_module->psz_capability, psz_capability ) )
314 for( i_submodule = 0;
315 i_submodule < p_module->i_children;
318 if( !strcmp( ((module_t*)p_module->pp_children[ i_submodule ])
319 ->psz_capability, psz_capability ) )
322 (module_t*)p_module->pp_children[ i_submodule ];
327 if( p_submodule == NULL )
332 p_module = p_submodule;
335 /* Test if we have the required CPU */
336 if( (p_module->i_cpu & p_this->p_libvlc->i_cpu) != p_module->i_cpu )
341 /* If we required a shortcut, check this plugin provides it. */
344 vlc_bool_t b_trash = VLC_TRUE;
345 int i_dummy, i_short = i_shortcuts;
346 char *psz_name = psz_shortcuts;
351 b_trash && p_module->pp_shortcuts[i_dummy];
354 b_trash = ( strcmp(psz_name, "any") || !p_module->i_score )
355 && strcmp( psz_name, p_module->pp_shortcuts[i_dummy] );
360 i_shortcut_bonus = i_short * 10000;
364 /* Go to the next shortcut... This is so lame! */
378 /* If we didn't require a shortcut, trash zero-scored plugins */
379 else if( !p_module->i_score )
384 /* Special case: test if we requested a particular intf plugin */
385 if( p_module->psz_program
386 && !strcmp( p_module->psz_program,
387 p_this->p_vlc->psz_object_name ) )
391 /* Remove previous non-matching plugins */
398 /* This one doesn't match */
402 /* Store this new module */
403 p_list[ i_index ].p_module = p_module;
404 p_list[ i_index ].i_score = p_module->i_score + i_shortcut_bonus;
406 /* Add it to the modules-to-probe list */
409 p_list[ 0 ].p_next = NULL;
414 /* Ok, so at school you learned that quicksort is quick, and
415 * bubble sort sucks raw eggs. But that's when dealing with
416 * thousands of items. Here we have barely 50. */
417 module_list_t *p_newlist = p_first;
419 if( p_first->i_score < p_list[ i_index ].i_score )
421 p_list[ i_index ].p_next = p_first;
422 p_first = &p_list[ i_index ];
426 while( p_newlist->p_next != NULL &&
427 p_newlist->p_next->i_score >= p_list[ i_index ].i_score )
429 p_newlist = p_newlist->p_next;
432 p_list[ i_index ].p_next = p_newlist->p_next;
433 p_newlist->p_next = &p_list[ i_index ];
440 msg_Dbg( p_this, "probing %i candidate%s",
441 i_index, i_index == 1 ? "" : "s" );
443 /* Lock all candidate modules */
445 while( p_tmp != NULL )
447 vlc_object_yield( p_tmp->p_module );
448 p_tmp = p_tmp->p_next;
451 /* We can release the list, interesting modules were yielded */
452 vlc_list_release( p_all );
454 /* Parse the linked list and use the first successful module */
456 while( p_tmp != NULL )
458 if( p_tmp->p_module->pf_activate
459 && p_tmp->p_module->pf_activate( p_this ) == VLC_SUCCESS )
464 vlc_object_release( p_tmp->p_module );
465 p_tmp = p_tmp->p_next;
468 /* Store the locked module value */
471 p_module = p_tmp->p_module;
472 p_tmp = p_tmp->p_next;
479 /* Unlock the remaining modules */
480 while( p_tmp != NULL )
482 vlc_object_release( p_tmp->p_module );
483 p_tmp = p_tmp->p_next;
488 if( p_module != NULL )
490 msg_Dbg( p_module, "using %s module \"%s\"",
491 psz_capability, p_module->psz_object_name );
493 else if( p_first == NULL )
495 msg_Err( p_this, "no %s module matched \"%s\"",
496 psz_capability, (psz_name && *psz_name) ? psz_name : "any" );
498 else if( psz_name != NULL && *psz_name )
500 msg_Err( p_this, "no %s module matching \"%s\" could be loaded",
501 psz_capability, (psz_name && *psz_name) ? psz_name : "any" );
506 free( psz_shortcuts );
514 /* Don't forget that the module is still locked */
518 /*****************************************************************************
519 * module_Unneed: decrease the usage count of a module.
520 *****************************************************************************
521 * This function must be called by the thread that called module_Need, to
522 * decrease the reference count and allow for hiding of modules.
523 *****************************************************************************/
524 void __module_Unneed( vlc_object_t * p_this, module_t * p_module )
526 /* Use the close method */
527 if( p_module->pf_deactivate )
529 p_module->pf_deactivate( p_this );
532 msg_Dbg( p_module, "unlocking module \"%s\"", p_module->psz_object_name );
534 vlc_object_release( p_module );
539 /*****************************************************************************
540 * Following functions are local.
541 *****************************************************************************/
543 /*****************************************************************************
544 * AllocateAllPlugins: load all plugin modules we can find.
545 *****************************************************************************/
546 #ifdef HAVE_DYNAMIC_PLUGINS
547 static void AllocateAllPlugins( vlc_object_t *p_this )
549 /* Yes, there are two NULLs because we replace one with "plugin-path". */
550 char * path[] = { "modules", PLUGIN_PATH, "plugins", NULL,
553 char ** ppsz_path = path;
555 #if defined( SYS_BEOS ) || defined( SYS_DARWIN )
556 char * psz_vlcpath = system_GetProgramPath();
557 int i_vlclen = strlen( psz_vlcpath );
558 vlc_bool_t b_notinroot;
561 #if defined( UNDER_CE )
562 wchar_t psz_dir[MAX_PATH];
565 /* If the user provided a plugin path, we add it to the list */
566 path[ sizeof(path)/sizeof(char*) - 2 ] = config_GetPsz( p_this,
569 for( ; *ppsz_path != NULL ; ppsz_path++ )
571 #if defined( SYS_BEOS ) || defined( SYS_DARWIN )
572 /* Store strlen(*ppsz_path) for later use. */
573 int i_dirlen = strlen( *ppsz_path );
575 b_notinroot = VLC_FALSE;
576 /* Under BeOS, we need to add beos_GetProgramPath() to access
577 * files under the current directory */
578 if( ( i_dirlen > 1 ) && strncmp( *ppsz_path, "/", 1 ) )
580 i_dirlen += i_vlclen + 2;
581 b_notinroot = VLC_TRUE;
583 psz_fullpath = malloc( i_dirlen );
584 if( psz_fullpath == NULL )
588 sprintf( psz_fullpath, "%s/%s", psz_vlcpath, *ppsz_path );
593 psz_fullpath = *ppsz_path;
596 msg_Dbg( p_this, "recursively browsing `%s'", psz_fullpath );
598 /* Don't go deeper than 5 subdirectories */
599 #if defined( UNDER_CE )
600 MultiByteToWideChar( CP_ACP, 0, psz_fullpath, -1, psz_dir, MAX_PATH );
601 AllocatePluginDir( p_this, psz_dir, 5 );
603 AllocatePluginDir( p_this, psz_fullpath, 5 );
606 #if defined( SYS_BEOS ) || defined( SYS_DARWIN )
609 free( psz_fullpath );
614 /* Free plugin-path */
615 free( path[ sizeof(path)/sizeof(char*) - 2 ] );
616 path[ sizeof(path)/sizeof(char*) - 2 ] = NULL;
619 /*****************************************************************************
620 * AllocatePluginDir: recursively parse a directory to look for plugins
621 *****************************************************************************/
622 static void AllocatePluginDir( vlc_object_t *p_this, const MYCHAR *psz_dir,
626 MYCHAR psz_path[MAX_PATH + 256];
627 WIN32_FIND_DATA finddata;
634 struct dirent * file;
643 rc = GetFileAttributes( psz_dir );
644 if( !(rc & FILE_ATTRIBUTE_DIRECTORY) )
646 /* Not a directory */
650 /* Parse all files in the directory */
651 swprintf( psz_path, L"%s\\*.*", psz_dir );
652 handle = FindFirstFile( psz_path, &finddata );
653 if( handle == INVALID_HANDLE_VALUE )
655 /* Empty directory */
659 /* Parse the directory and try to load all files it contains. */
662 unsigned int i_len = wcslen( finddata.cFileName );
664 swprintf( psz_path, L"%s\\%s", psz_dir, finddata.cFileName );
666 if( GetFileAttributes( psz_path ) & FILE_ATTRIBUTE_DIRECTORY )
668 AllocatePluginDir( p_this, psz_path, i_maxdepth - 1 );
670 else if( i_len > strlen( LIBEXT ) )
672 AllocatePluginFile( p_this, psz_path );
675 while( FindNextFile( handle, &finddata ) );
677 /* Close the directory */
681 dir = opendir( psz_dir );
687 i_dirlen = strlen( psz_dir );
689 /* Parse the directory and try to load all files it contains. */
690 while( (file = readdir( dir )) )
695 /* Skip ".", ".." and anything starting with "." */
696 if( !*file->d_name || *file->d_name == '.' )
701 i_len = strlen( file->d_name );
702 psz_file = malloc( i_dirlen + 1 + i_len + 1 );
703 sprintf( psz_file, "%s/%s", psz_dir, file->d_name );
705 if( !stat( psz_file, &statbuf ) && statbuf.st_mode & S_IFDIR )
707 AllocatePluginDir( p_this, psz_file, i_maxdepth - 1 );
709 else if( i_len > strlen( LIBEXT )
710 /* We only load files ending with LIBEXT */
711 && !strncasecmp( file->d_name + i_len - strlen( LIBEXT ),
712 LIBEXT, strlen( LIBEXT ) ) )
714 AllocatePluginFile( p_this, psz_file );
720 /* Close the directory */
726 /*****************************************************************************
727 * AllocatePluginFile: load a module into memory and initialize it.
728 *****************************************************************************
729 * This function loads a dynamically loadable module and allocates a structure
730 * for its information data. The module can then be handled by module_Need
731 * and module_Unneed. It can be removed by DeleteModule.
732 *****************************************************************************/
733 static int AllocatePluginFile( vlc_object_t * p_this, MYCHAR * psz_file )
736 module_handle_t handle;
739 char psz_filename[MAX_PATH];
740 WideCharToMultiByte( CP_ACP, WC_DEFAULTCHAR, psz_file, -1,
741 psz_filename, MAX_PATH, NULL, NULL );
743 char * psz_filename = psz_file;
746 /* Try to dynamically load the module. */
747 if( module_load( psz_file, &handle ) )
749 char psz_buffer[256];
751 /* The plugin module couldn't be opened */
752 msg_Warn( p_this, "cannot open `%s' (%s)",
753 psz_filename, module_error( psz_buffer ) );
757 /* Now that we have successfully loaded the module, we can
758 * allocate a structure for it */
759 p_module = vlc_object_create( p_this, VLC_OBJECT_MODULE );
760 if( p_module == NULL )
762 msg_Err( p_this, "out of memory" );
763 module_unload( handle );
767 /* We need to fill these since they may be needed by CallEntry() */
768 p_module->psz_filename = psz_filename;
769 p_module->handle = handle;
770 p_module->p_symbols = &p_this->p_libvlc->p_module_bank->symbols;
772 /* Initialize the module: fill p_module->psz_object_name, default config */
773 if( CallEntry( p_module ) != 0 )
775 /* We couldn't call module_init() */
776 vlc_object_destroy( p_module );
777 module_unload( handle );
781 DupModule( p_module );
782 p_module->psz_filename = strdup( p_module->psz_filename );
783 p_module->psz_longname = strdup( p_module->psz_longname );
785 /* Everything worked fine ! The module is ready to be added to the list. */
786 p_module->b_builtin = VLC_FALSE;
788 /* msg_Dbg( p_this, "plugin \"%s\", %s",
789 p_module->psz_object_name, p_module->psz_longname ); */
791 vlc_object_attach( p_module, p_this->p_libvlc->p_module_bank );
796 /*****************************************************************************
797 * DupModule: make a plugin module standalone.
798 *****************************************************************************
799 * This function duplicates all strings in the module, so that the dynamic
800 * object can be unloaded. It acts recursively on submodules.
801 *****************************************************************************/
802 static void DupModule( module_t *p_module )
807 for( pp_shortcut = p_module->pp_shortcuts ; *pp_shortcut ; pp_shortcut++ )
809 *pp_shortcut = strdup( *pp_shortcut );
812 /* We strdup() these entries so that they are still valid when the
813 * module is unloaded. */
814 p_module->psz_object_name = strdup( p_module->psz_object_name );
815 p_module->psz_capability = strdup( p_module->psz_capability );
817 if( p_module->psz_program != NULL )
819 p_module->psz_program = strdup( p_module->psz_program );
822 for( i_submodule = 0; i_submodule < p_module->i_children; i_submodule++ )
824 DupModule( (module_t*)p_module->pp_children[ i_submodule ] );
828 /*****************************************************************************
829 * UndupModule: free a duplicated module.
830 *****************************************************************************
831 * This function frees the allocations done in DupModule().
832 *****************************************************************************/
833 static void UndupModule( module_t *p_module )
838 for( i_submodule = 0; i_submodule < p_module->i_children; i_submodule++ )
840 UndupModule( (module_t*)p_module->pp_children[ i_submodule ] );
843 for( pp_shortcut = p_module->pp_shortcuts ; *pp_shortcut ; pp_shortcut++ )
845 free( *pp_shortcut );
848 free( p_module->psz_object_name );
849 free( p_module->psz_capability );
851 if( p_module->psz_program != NULL )
853 free( p_module->psz_program );
857 #endif /* HAVE_DYNAMIC_PLUGINS */
859 /*****************************************************************************
860 * AllocateBuiltinModule: initialize a builtin module.
861 *****************************************************************************
862 * This function registers a builtin module and allocates a structure
863 * for its information data. The module can then be handled by module_Need
864 * and module_Unneed. It can be removed by DeleteModule.
865 *****************************************************************************/
866 static int AllocateBuiltinModule( vlc_object_t * p_this,
867 int ( *pf_entry ) ( module_t * ) )
871 /* Now that we have successfully loaded the module, we can
872 * allocate a structure for it */
873 p_module = vlc_object_create( p_this, VLC_OBJECT_MODULE );
874 if( p_module == NULL )
876 msg_Err( p_this, "out of memory" );
880 /* Initialize the module : fill p_module->psz_object_name, etc. */
881 if( pf_entry( p_module ) != 0 )
883 /* With a well-written module we shouldn't have to print an
884 * additional error message here, but just make sure. */
885 msg_Err( p_this, "failed calling entry point in builtin module" );
886 vlc_object_destroy( p_module );
890 /* Everything worked fine ! The module is ready to be added to the list. */
891 p_module->b_builtin = VLC_TRUE;
893 /* msg_Dbg( p_this, "builtin \"%s\", %s",
894 p_module->psz_object_name, p_module->psz_longname ); */
896 vlc_object_attach( p_module, p_this->p_libvlc->p_module_bank );
901 /*****************************************************************************
902 * DeleteModule: delete a module and its structure.
903 *****************************************************************************
904 * This function can only be called if the module isn't being used.
905 *****************************************************************************/
906 static int DeleteModule( module_t * p_module )
908 vlc_object_detach( p_module );
910 /* We free the structures that we strdup()ed in Allocate*Module(). */
911 #ifdef HAVE_DYNAMIC_PLUGINS
912 if( !p_module->b_builtin )
914 if( p_module->b_unloadable )
916 module_unload( p_module->handle );
918 UndupModule( p_module );
919 free( p_module->psz_filename );
920 free( p_module->psz_longname );
924 /* Free and detach the object's children */
925 while( p_module->i_children )
927 vlc_object_t *p_this = p_module->pp_children[0];
928 vlc_object_detach( p_this );
929 vlc_object_destroy( p_this );
932 config_Free( p_module );
933 vlc_object_destroy( p_module );
938 #ifdef HAVE_DYNAMIC_PLUGINS
939 /*****************************************************************************
940 * CallEntry: call an entry point.
941 *****************************************************************************
942 * This function calls a symbol given its name and a module structure. The
943 * symbol MUST refer to a function returning int and taking a module_t* as
945 *****************************************************************************/
946 static int CallEntry( module_t * p_module )
948 static char *psz_name = "vlc_entry" MODULE_SUFFIX;
949 int (* pf_symbol) ( module_t * p_module );
951 /* Try to resolve the symbol */
952 pf_symbol = (int (*)(module_t *)) module_getsymbol( p_module->handle,
955 if( pf_symbol == NULL )
957 char psz_buffer[256];
959 /* We couldn't load the symbol */
960 msg_Warn( p_module, "cannot find symbol \"%s\" in file `%s' (%s)",
961 psz_name, p_module->psz_filename,
962 module_error( psz_buffer ) );
966 /* We can now try to call the symbol */
967 if( pf_symbol( p_module ) != 0 )
969 /* With a well-written module we shouldn't have to print an
970 * additional error message here, but just make sure. */
971 msg_Err( p_module, "failed calling symbol \"%s\" in file `%s'",
972 psz_name, p_module->psz_filename );
976 /* Everything worked fine, we can return */
979 #endif /* HAVE_DYNAMIC_PLUGINS */