src/posix/plugin.c

   1 /*****************************************************************************
   2  * plugin.c : Low-level dynamic library handling
   3  *****************************************************************************
   4  * Copyright (C) 2001-2007 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Sam Hocevar <sam@zoy.org>
   8  *          Ethan C. Baldridge <BaldridgeE@cadmus.com>
   9  *          Hans-Peter Jansen <hpj@urpla.net>
  10  *          Gildas Bazin <gbazin@videolan.org>
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU Lesser General Public License as published by
  14  * the Free Software Foundation; either version 2.1 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  20  * GNU Lesser General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Lesser General Public License
  23  * along with this program; if not, write to the Free Software Foundation,
  24  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  25  *****************************************************************************/
  26
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <assert.h>
  32 #include <vlc_common.h>
  33 #include "modules/modules.h"
  34
  35 #include <sys/types.h>
  36 #include <dlfcn.h>
  37
  38 #ifdef HAVE_VALGRIND_VALGRIND_H
  39 # include <valgrind/valgrind.h>
  40 #endif
  41
  42 void *vlc_dlopen(const char *path, bool lazy)
  43 {
  44 #if defined (RTLD_NOW)
  45     const int flags = lazy ? RTLD_LAZY : RTLD_NOW;
  46 #elif defined (DL_LAZY)
  47     const int flags = DL_LAZY;
  48     VLC_UNUSED(lazy);
  49 #else
  50     const int flags = 0;
  51     VLC_UNUSED(lazy);
  52 #endif
  53     return dlopen (path, flags);
  54 }
  55
  56 int vlc_dlclose(void *handle)
  57 {
  58 #if !defined(__SANITIZE_ADDRESS__)
  59 #ifdef HAVE_VALGRIND_VALGRIND_H
  60     if( RUNNING_ON_VALGRIND > 0 )
  61         return 0; /* do not dlclose() so that we get proper stack traces */
  62 #endif
  63     int err = dlclose( handle );
  64     assert(err == 0);
  65     return err;
  66 #else
  67     (void) handle;
  68     return 0;
  69 #endif
  70 }
  71
  72 void *vlc_dlsym(void *handle, const char *name)
  73 {
  74     return dlsym(handle, name);
  75 }
  76
  77 char *vlc_dlerror(void)
  78 {
  79     const char *errmsg = dlerror();
  80     /* XXX: This is not thread-safe at all. POSIX is helpless here. */
  81     return (errmsg != NULL) ? strdup(errmsg) : NULL;
  82 }