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    1 /* lt_dlloader.h -- dynamic library loader interface
    2 
    3    Copyright (C) 2004, 2007-2008, 2011-2015 Free Software Foundation,
    4    Inc.
    5    Written by Gary V. Vaughan, 2004
    6 
    7    NOTE: The canonical source of this file is maintained with the
    8    GNU Libtool package.  Report bugs to bug-libtool@gnu.org.
    9 
   10 GNU Libltdl is free software; you can redistribute it and/or
   11 modify it under the terms of the GNU Lesser General Public
   12 License as published by the Free Software Foundation; either
   13 version 2 of the License, or (at your option) any later version.
   14 
   15 As a special exception to the GNU Lesser General Public License,
   16 if you distribute this file as part of a program or library that
   17 is built using GNU Libtool, you may include this file under the
   18 same distribution terms that you use for the rest of that program.
   19 
   20 GNU Libltdl is distributed in the hope that it will be useful,
   21 but WITHOUT ANY WARRANTY; without even the implied warranty of
   22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   23 GNU Lesser General Public License for more details.
   24 
   25 You should have received a copy of the GNU Lesser General Public
   26 License along with GNU Libltdl; see the file COPYING.LIB.  If not, a
   27 copy can be downloaded from  http://www.gnu.org/licenses/lgpl.html,
   28 or obtained by writing to the Free Software Foundation, Inc.,
   29 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
   30 */
   31 
   32 #if !defined LT_DLLOADER_H
   33 #define LT_DLLOADER_H 1
   34 
   35 #include <libltdl/lt_system.h>
   36 
   37 LT_BEGIN_C_DECLS
   38 
   39 typedef void *  lt_dlloader;
   40 typedef void *  lt_module;
   41 typedef void *  lt_user_data;
   42 typedef struct lt__advise * lt_dladvise;
   43 
   44 /* Function pointer types for module loader vtable entries:  */
   45 typedef lt_module   lt_module_open  (lt_user_data data,
   46                      const char *filename,
   47                      lt_dladvise advise);
   48 typedef int     lt_module_close (lt_user_data data,
   49                      lt_module module);
   50 typedef void *      lt_find_sym     (lt_user_data data, lt_module module,
   51                      const char *symbolname);
   52 typedef int     lt_dlloader_init    (lt_user_data data);
   53 typedef int     lt_dlloader_exit    (lt_user_data data);
   54 
   55 /* Default priority is LT_DLLOADER_PREPEND if none is explicitly given.  */
   56 typedef enum {
   57   LT_DLLOADER_PREPEND = 0, LT_DLLOADER_APPEND
   58 } lt_dlloader_priority;
   59 
   60 /* This structure defines a module loader, as populated by the get_vtable
   61    entry point of each loader.  */
   62 typedef struct {
   63   const char *      name;
   64   const char *      sym_prefix;
   65   lt_module_open *  module_open;
   66   lt_module_close * module_close;
   67   lt_find_sym *     find_sym;
   68   lt_dlloader_init *    dlloader_init;
   69   lt_dlloader_exit *    dlloader_exit;
   70   lt_user_data      dlloader_data;
   71   lt_dlloader_priority  priority;
   72 } lt_dlvtable;
   73 
   74 LT_SCOPE int        lt_dlloader_add    (const lt_dlvtable *vtable);
   75 LT_SCOPE lt_dlloader    lt_dlloader_next   (const lt_dlloader loader);
   76 
   77 LT_SCOPE lt_dlvtable *  lt_dlloader_remove  (const char *name);
   78 LT_SCOPE const lt_dlvtable *lt_dlloader_find    (const char *name);
   79 LT_SCOPE const lt_dlvtable *lt_dlloader_get (lt_dlloader loader);
   80 
   81 
   82 /* Type of a function to get a loader's vtable:  */
   83 typedef  const lt_dlvtable *lt_get_vtable   (lt_user_data data);
   84 
   85 #ifdef LT_DEBUG_LOADERS
   86 LT_SCOPE void       lt_dlloader_dump    (void);
   87 #endif
   88 
   89 LT_END_C_DECLS
   90 
   91 #endif /*!defined LT_DLLOADER_H*/