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https://code.videolan.org/videolan/vlc
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4f551c2bf0
* Fixes to aout_darwin.c by Colin Delacroix <colin@zoy.org>. * Fixes to configure.in, Makefile.in and main.c (Altivec detection) by Eugenio Jarosiewicz <ej0@cise.ufl.edu>. * Added Colin and Eugenio to the AUTHORS file.
126 lines
4.7 KiB
C
126 lines
4.7 KiB
C
/*****************************************************************************
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* modules_core.h : Module management functions used by the core application.
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*****************************************************************************
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* Copyright (C) 2001 VideoLAN
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* $Id: modules_core.h,v 1.5 2001/03/21 13:42:33 sam Exp $
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*
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* Authors: Samuel Hocevar <sam@zoy.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Inline functions for handling dynamic modules
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*****************************************************************************/
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/*****************************************************************************
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* module_load: load a dynamic library
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*****************************************************************************
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* This function loads a dynamically linked library using a system dependant
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* method, and returns a non-zero value on error, zero otherwise.
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*****************************************************************************/
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static __inline__ int
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module_load( char * psz_filename, module_handle_t * handle )
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{
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#ifdef SYS_BEOS
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*handle = load_add_on( psz_filename );
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return( *handle < 0 );
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#else
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/* Do not open modules with RTLD_GLOBAL, or we are going to get namespace
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* collisions when two modules have common public symbols */
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*handle = dlopen( psz_filename, RTLD_NOW );
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return( *handle == NULL );
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#endif
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}
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/*****************************************************************************
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* module_unload: unload a dynamic library
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*****************************************************************************
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* This function unloads a previously opened dynamically linked library
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* using a system dependant method. No return value is taken in consideration,
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* since some libraries sometimes refuse to close properly.
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*****************************************************************************/
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static __inline__ void
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module_unload( module_handle_t handle )
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{
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#ifdef SYS_BEOS
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unload_add_on( handle );
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#else
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dlclose( handle );
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#endif
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return;
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}
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/*****************************************************************************
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* module_getsymbol: get a symbol from a dynamic library
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*****************************************************************************
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* This function queries a loaded library for a symbol specified in a
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* string, and returns a pointer to it.
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* FIXME: under Unix we should maybe check for dlerror() instead of the
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* return value of dlsym, since we could have loaded a symbol really set
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* to NULL (quite unlikely, though).
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*****************************************************************************/
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static __inline__ void *
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module_getsymbol( module_handle_t handle, char * psz_function )
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{
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#ifdef SYS_BEOS
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void * p_symbol;
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if( B_OK == get_image_symbol( handle, psz_function,
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B_SYMBOL_TYPE_TEXT, &p_symbol ) )
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{
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return( p_symbol );
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}
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else
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{
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return( NULL );
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}
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#elif defined(SYS_DARWIN1_3)
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/* MacOS X dl library expects symbols to begin with "_". That's
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* really lame, but hey, what can we do ? */
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char * psz_call = malloc( strlen( psz_function ) + 2 );
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void * p_return;
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strcpy( psz_call + 1, psz_function );
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psz_call[ 0 ] = '_';
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p_return = dlsym( handle, psz_call );
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free( psz_call );
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return( p_return );
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#else
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return( dlsym( handle, psz_function ) );
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#endif
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}
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/*****************************************************************************
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* module_error: wrapper for dlerror()
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*****************************************************************************
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* This function returns the error message of the last module operation. It
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* returns the string "failed" on systems which do not have the dlerror()
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* function.
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*****************************************************************************/
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static __inline__ const char *
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module_error( void )
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{
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#ifdef SYS_BEOS
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return( "failed" );
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#else
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return( dlerror() );
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#endif
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}
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