* modules_plugin.h : Plugin management functions used by the core application.
*****************************************************************************
* Copyright (C) 2001 VideoLAN
- * $Id: modules_plugin.h.in,v 1.6 2002/11/11 14:39:12 sam Exp $
+ * $Id: modules_plugin.h.in,v 1.15 2003/10/05 15:35:59 sam Exp $
*
* Authors: Samuel Hocevar <sam@zoy.org>
*
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
- *
+ *
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* 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 char * psz_filename, module_handle_t * handle )
-{
-#ifdef SYS_BEOS
- *handle = load_add_on( psz_filename );
- return( *handle < 0 );
-
-#elif defined(WIN32) || defined(UNDER_CE)
- *handle = LoadLibrary( psz_filename );
- return( *handle == NULL );
-
-#elif defined(RTLD_NOW)
-# if defined(SYS_LINUX)
- /* 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" ) )
- {
- *handle = dlopen( psz_filename, RTLD_NOW | RTLD_GLOBAL );
- return( *handle == NULL );
- }
-# endif
- *handle = dlopen( psz_filename, RTLD_NOW );
- return( *handle == NULL );
-
-#else
- *handle = dlopen( psz_filename, DL_LAZY );
- return( *handle == NULL );
-
-#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 )
-{
-#ifdef SYS_BEOS
- unload_add_on( handle );
-
-#elif defined(WIN32) || defined(UNDER_CE)
- FreeLibrary( handle );
-
-#else
- dlclose( 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 )
-{
-#ifdef SYS_BEOS
- 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(WIN32) || defined(UNDER_CE)
- return( (void *)GetProcAddress( handle, psz_function ) );
-
-#else
- return( dlsym( handle, psz_function ) );
-
-#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(SYS_BEOS)
- return( "failed" );
-
-#elif defined(WIN32) || defined(UNDER_CE)
- 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;
-
-#else
- return( dlerror() );
-
-#endif
-}
-
/*****************************************************************************
* STORE_SYMBOLS: store known symbols into p_symbols for plugin access.
*****************************************************************************/
projects / vlc / blobdiff