src/posix/plugin.c

   1 /*****************************************************************************
   2  * plugin.c : Low-level dynamic library handling
   3  *****************************************************************************
   4  * Copyright (C) 2001-2007 VLC authors and VideoLAN
   5  *
   6  * Authors: Sam Hocevar <sam@zoy.org>
   7  *          Ethan C. Baldridge <BaldridgeE@cadmus.com>
   8  *          Hans-Peter Jansen <hpj@urpla.net>
   9  *          Gildas Bazin <gbazin@videolan.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms of the GNU Lesser General Public License as published by
  13  * the Free Software Foundation; either version 2.1 of the License, or
  14  * (at your option) any later version.
  15  *
  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 Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public License
  22  * along with this program; if not, write to the Free Software Foundation,
  23  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  24  *****************************************************************************/
  25
  26 #ifdef HAVE_CONFIG_H
  27 # include "config.h"
  28 #endif
  29
  30 #include <assert.h>
  31 #include <vlc_common.h>
  32 #include "modules/modules.h"
  33
  34 #include <sys/types.h>
  35 #include <dlfcn.h>
  36
  37 #ifdef HAVE_VALGRIND_VALGRIND_H
  38 # include <valgrind/valgrind.h>
  39 #endif
  40
  41 void *vlc_dlopen(const char *path, bool lazy)
  42 {
  43 #if defined (RTLD_NOW)
  44     const int flags = lazy ? RTLD_LAZY : RTLD_NOW;
  45 #elif defined (DL_LAZY)
  46     const int flags = DL_LAZY;
  47     VLC_UNUSED(lazy);
  48 #else
  49     const int flags = 0;
  50     VLC_UNUSED(lazy);
  51 #endif
  52     return dlopen (path, flags);
  53 }
  54
  55 int vlc_dlclose(void *handle)
  56 {
  57 #if !defined(__SANITIZE_ADDRESS__)
  58 #ifdef HAVE_VALGRIND_VALGRIND_H
  59     if( RUNNING_ON_VALGRIND > 0 )
  60         return 0; /* do not dlclose() so that we get proper stack traces */
  61 #endif
  62     int err = dlclose( handle );
  63     assert(err == 0);
  64     return err;
  65 #else
  66     (void) handle;
  67     return 0;
  68 #endif
  69 }
  70
  71 void *vlc_dlsym(void *handle, const char *name)
  72 {
  73     return dlsym(handle, name);
  74 }
  75
  76 char *vlc_dlerror(void)
  77 {
  78     const char *errmsg = dlerror();
  79     /* XXX: This is not thread-safe at all. POSIX is helpless here. */
  80     return (errmsg != NULL) ? strdup(errmsg) : NULL;
  81 }