* modules_plugin.h : Plugin management functions used by the core application.
*****************************************************************************
* Copyright (C) 2001 VideoLAN
- * $Id: modules_plugin.h.in,v 1.12 2003/10/04 12:30:53 massiot Exp $
+ * $Id: modules_plugin.h.in,v 1.15 2003/10/05 15:35:59 sam Exp $
*
* Authors: Samuel Hocevar <sam@zoy.org>
*
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
-/*****************************************************************************
- * Inline functions for handling dynamic modules
- *****************************************************************************/
-
-/*****************************************************************************
- * module_load: load a dynamic library
- *****************************************************************************
- * This function loads a dynamically linked library using a system dependant
- * method, and returns a non-zero value on error, zero otherwise.
- *****************************************************************************/
-static int module_load( const MYCHAR * psz_filename, module_handle_t * handle )
-{
-#if defined(HAVE_DL_DYLD)
- NSObjectFileImage image;
- NSObjectFileImageReturnCode ret;
-
- ret = NSCreateObjectFileImageFromFile( psz_filename, &image );
-
- if( ret != NSObjectFileImageSuccess )
- {
- return -1;
- }
-
- /* Open the dynamic module */
- *handle = NSLinkModule( image, psz_filename,
- NSLINKMODULE_OPTION_RETURN_ON_ERROR );
-
- if( !*handle )
- {
- NSLinkEditErrors errors;
- const char *psz_file, *psz_err;
- int i_errnum;
- NSLinkEditError( &errors, &i_errnum, &psz_file, &psz_err );
- return -1; /* err */
- }
-
- /* Destroy our image, we won't need it */
- NSDestroyObjectFileImage( image );
-
-#elif defined(HAVE_IMAGE_H)
- *handle = load_add_on( psz_filename );
- return( *handle < 0 );
-
-#elif defined(WIN32) || defined(UNDER_CE)
- *handle = LoadLibrary( psz_filename );
- return( *handle == NULL );
-
-#elif defined(HAVE_DL_DLOPEN) && defined(RTLD_NOW)
- /* static is OK, we are called atomically */
- static vlc_bool_t b_kde = VLC_FALSE;
-
-# if defined(SYS_LINUX)
- /* XXX HACK #1 - we should NOT open modules with RTLD_GLOBAL, or we
- * are going to get namespace collisions when two modules have common
- * public symbols, but ALSA is being a pest here. */
- if( strstr( psz_filename, "alsa_plugin" ) )
- {
- *handle = dlopen( psz_filename, RTLD_NOW | RTLD_GLOBAL );
- return( *handle == NULL );
- }
-# endif
- /* XXX HACK #2 - the ugly KDE workaround. It seems that libkdewhatever
- * causes dlopen() to segfault if libstdc++ is not loaded in the caller,
- * so we just load libstdc++. Bwahahaha! ph34r! -- Sam. */
- /* Update: FYI, this is Debian bug #180505, and seems to be fixed. */
- if( !b_kde && !strstr( psz_filename, "kde" ) )
- {
- dlopen( "libstdc++.so.6", RTLD_NOW )
- || dlopen( "libstdc++.so.5", RTLD_NOW )
- || dlopen( "libstdc++.so.4", RTLD_NOW )
- || dlopen( "libstdc++.so.3", RTLD_NOW );
- b_kde = VLC_TRUE;
- }
-
- *handle = dlopen( psz_filename, RTLD_NOW );
- return( *handle == NULL );
-
-#elif defined(HAVE_DL_DLOPEN) && defined(DL_LAZY)
- *handle = dlopen( psz_filename, DL_LAZY );
- return( *handle == NULL );
-
-#elif defined(HAVE_DL_SHL_LOAD)
- *handle = shl_load( psz_filename, BIND_IMMEDIATE | BIND_NONFATAL, NULL );
- return( *handle == NULL );
-
-#else
- return -1;
-
-#endif
-}
-
-/*****************************************************************************
- * module_unload: unload a dynamic library
- *****************************************************************************
- * This function unloads a previously opened dynamically linked library
- * using a system dependant method. No return value is taken in consideration,
- * since some libraries sometimes refuse to close properly.
- *****************************************************************************/
-static void module_unload( module_handle_t handle )
-{
-#if defined(HAVE_DL_DYLD)
- NSUnLinkModule( handle, FALSE );
-
-#elif defined(HAVE_IMAGE_H)
- unload_add_on( handle );
-
-#elif defined(WIN32) || defined(UNDER_CE)
- FreeLibrary( handle );
-
-#elif defined(HAVE_DL_DLOPEN)
- dlclose( handle );
-
-#elif defined(HAVE_DL_SHL_LOAD)
- shl_unload( handle );
-
-#endif
- return;
-}
-
-/*****************************************************************************
- * module_getsymbol: get a symbol from a dynamic library
- *****************************************************************************
- * This function queries a loaded library for a symbol specified in a
- * string, and returns a pointer to it. We don't check for dlerror() or
- * similar functions, since we want a non-NULL symbol anyway.
- *****************************************************************************/
-static void * _module_getsymbol( module_handle_t handle,
- const char * psz_function )
-{
-#if defined(HAVE_DL_DYLD)
- NSSymbol sym = NSLookupSymbolInModule( handle, psz_function );
- return NSAddressOfSymbol( sym );
-
-#elif defined(HAVE_IMAGE_H)
- void * p_symbol;
- if( B_OK == get_image_symbol( handle, psz_function,
- B_SYMBOL_TYPE_TEXT, &p_symbol ) )
- {
- return p_symbol;
- }
- else
- {
- return NULL;
- }
-
-#elif defined( UNDER_CE )
- wchar_t psz_real[256];
- MultiByteToWideChar( CP_ACP, 0, psz_function, -1, psz_real, 256 );
-
- return (void *)GetProcAddress( handle, psz_real );
-
-#elif defined( WIN32 )
- return (void *)GetProcAddress( handle, (MYCHAR*)psz_function );
-
-#elif defined(HAVE_DL_DLOPEN)
- return dlsym( handle, psz_function );
-
-#elif defined(HAVE_DL_SHL_LOAD)
- void *p_sym;
- shl_findsym( &handle, psz_function, TYPE_UNDEFINED, &p_sym );
- return p_sym;
-
-#endif
-}
-
-static void * module_getsymbol( module_handle_t handle,
- const char * psz_function )
-{
- void * p_symbol = _module_getsymbol( handle, psz_function );
-
- /* MacOS X dl library expects symbols to begin with "_". So do
- * some other operating systems. That's really lame, but hey, what
- * can we do ? */
- if( p_symbol == NULL )
- {
- char *psz_call = malloc( strlen( psz_function ) + 2 );
-
- strcpy( psz_call + 1, psz_function );
- psz_call[ 0 ] = '_';
- p_symbol = _module_getsymbol( handle, psz_call );
- free( psz_call );
- }
-
- return p_symbol;
-}
-
-/*****************************************************************************
- * module_error: wrapper for dlerror()
- *****************************************************************************
- * This function returns the error message of the last module operation. It
- * returns the string "failed" on systems which do not have a dlerror() like
- * function. psz_buffer can be used to store temporary data, it is guaranteed
- * to be kept intact until the return value of module_error has been used.
- *****************************************************************************/
-static const char * module_error( char *psz_buffer )
-{
-#if defined(HAVE_DL_DYLD)
- return "failed";
-
-#elif defined(HAVE_IMAGE_H)
- return "failed";
-
-#elif defined(UNDER_CE)
- wchar_t psz_tmp[256];
-
- int i, i_error = GetLastError();
-
- FormatMessage( FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
- NULL, i_error, MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
- (LPTSTR) psz_tmp, 256, NULL );
-
- /* Go to the end of the string */
- for( i = 0;
- psz_tmp[i] && psz_tmp[i] != L'\r' && psz_tmp[i] != L'\n';
- i++ ) {};
-
- if( psz_tmp[i] )
- {
- swprintf( psz_tmp + i, L" (error %i)", i_error );
- psz_tmp[ 255 ] = L'\0';
- }
-
- WideCharToMultiByte( CP_ACP, WC_DEFAULTCHAR, psz_tmp, -1,
- psz_buffer, 256, NULL, NULL );
-
- return psz_buffer;
-
-#elif defined(WIN32)
- int i, i_error = GetLastError();
-
- FormatMessage( FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
- NULL, i_error, MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
- (LPTSTR) psz_buffer, 256, NULL );
-
- /* Go to the end of the string */
- for( i = 0;
- psz_buffer[i] && psz_buffer[i] != '\r' && psz_buffer[i] != '\n';
- i++ ) {};
-
- if( psz_buffer[i] )
- {
- snprintf( psz_buffer + i, 256 - i, " (error %i)", i_error );
- psz_buffer[ 255 ] = '\0';
- }
-
- return psz_buffer;
-
-#elif defined(HAVE_DL_DLOPEN)
- return dlerror();
-
-#elif defined(HAVE_DL_SHL_LOAD)
- return strerror( errno );
-
-#endif
-}
-
/*****************************************************************************
* STORE_SYMBOLS: store known symbols into p_symbols for plugin access.
*****************************************************************************/
projects / vlc / blobdiff