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h2/libltdl/ltdl.h
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h2/libltdl/ltdl.h
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/* ltdl.h -- generic dlopen functions
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Copyright (C) 1998-2000, 2004, 2005,
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2007, 2008 Free Software Foundation, Inc.
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Written by Thomas Tanner, 1998
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NOTE: The canonical source of this file is maintained with the
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GNU Libtool package. Report bugs to bug-libtool@gnu.org.
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GNU Libltdl is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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As a special exception to the GNU Lesser General Public License,
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if you distribute this file as part of a program or library that
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is built using GNU Libtool, you may include this file under the
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same distribution terms that you use for the rest of that program.
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GNU Libltdl 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with GNU Libltdl; see the file COPYING.LIB. If not, a
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copy can be downloaded from http://www.gnu.org/licenses/lgpl.html,
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or obtained by writing to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/* Only include this header file once. */
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#if !defined(LTDL_H)
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#define LTDL_H 1
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#include <libltdl/lt_system.h>
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#include <libltdl/lt_error.h>
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#include <libltdl/lt_dlloader.h>
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LT_BEGIN_C_DECLS
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/* LT_STRLEN can be used safely on NULL pointers. */
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#define LT_STRLEN(s) (((s) && (s)[0]) ? strlen (s) : 0)
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/* --- DYNAMIC MODULE LOADING API --- */
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typedef struct lt__handle *lt_dlhandle; /* A loaded module. */
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/* Initialisation and finalisation functions for libltdl. */
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LT_SCOPE int lt_dlinit (void);
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LT_SCOPE int lt_dlexit (void);
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/* Module search path manipulation. */
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LT_SCOPE int lt_dladdsearchdir (const char *search_dir);
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LT_SCOPE int lt_dlinsertsearchdir (const char *before,
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const char *search_dir);
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LT_SCOPE int lt_dlsetsearchpath (const char *search_path);
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LT_SCOPE const char *lt_dlgetsearchpath (void);
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LT_SCOPE int lt_dlforeachfile (
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const char *search_path,
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int (*func) (const char *filename, void *data),
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void *data);
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/* User module loading advisors. */
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LT_SCOPE int lt_dladvise_init (lt_dladvise *advise);
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LT_SCOPE int lt_dladvise_destroy (lt_dladvise *advise);
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LT_SCOPE int lt_dladvise_ext (lt_dladvise *advise);
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LT_SCOPE int lt_dladvise_resident (lt_dladvise *advise);
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LT_SCOPE int lt_dladvise_local (lt_dladvise *advise);
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LT_SCOPE int lt_dladvise_global (lt_dladvise *advise);
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LT_SCOPE int lt_dladvise_preload (lt_dladvise *advise);
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/* Portable libltdl versions of the system dlopen() API. */
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LT_SCOPE lt_dlhandle lt_dlopen (const char *filename);
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LT_SCOPE lt_dlhandle lt_dlopenext (const char *filename);
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LT_SCOPE lt_dlhandle lt_dlopenadvise (const char *filename,
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lt_dladvise advise);
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LT_SCOPE void * lt_dlsym (lt_dlhandle handle, const char *name);
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LT_SCOPE const char *lt_dlerror (void);
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LT_SCOPE int lt_dlclose (lt_dlhandle handle);
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/* --- PRELOADED MODULE SUPPORT --- */
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/* A preopened symbol. Arrays of this type comprise the exported
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symbols for a dlpreopened module. */
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typedef struct {
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const char *name;
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void *address;
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} lt_dlsymlist;
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typedef int lt_dlpreload_callback_func (lt_dlhandle handle);
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LT_SCOPE int lt_dlpreload (const lt_dlsymlist *preloaded);
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LT_SCOPE int lt_dlpreload_default (const lt_dlsymlist *preloaded);
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LT_SCOPE int lt_dlpreload_open (const char *originator,
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lt_dlpreload_callback_func *func);
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#define lt_preloaded_symbols lt__PROGRAM__LTX_preloaded_symbols
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/* Ensure C linkage. */
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extern LT_DLSYM_CONST lt_dlsymlist lt__PROGRAM__LTX_preloaded_symbols[];
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#define LTDL_SET_PRELOADED_SYMBOLS() \
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lt_dlpreload_default(lt_preloaded_symbols)
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/* --- MODULE INFORMATION --- */
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/* Associating user data with loaded modules. */
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typedef void * lt_dlinterface_id;
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typedef int lt_dlhandle_interface (lt_dlhandle handle, const char *id_string);
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LT_SCOPE lt_dlinterface_id lt_dlinterface_register (const char *id_string,
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lt_dlhandle_interface *iface);
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LT_SCOPE void lt_dlinterface_free (lt_dlinterface_id key);
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LT_SCOPE void * lt_dlcaller_set_data (lt_dlinterface_id key,
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lt_dlhandle handle, void *data);
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LT_SCOPE void * lt_dlcaller_get_data (lt_dlinterface_id key,
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lt_dlhandle handle);
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/* Read only information pertaining to a loaded module. */
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typedef struct {
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char * filename; /* file name */
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char * name; /* module name */
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int ref_count; /* number of times lt_dlopened minus
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number of times lt_dlclosed. */
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unsigned int is_resident:1; /* module can't be unloaded. */
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unsigned int is_symglobal:1; /* module symbols can satisfy
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subsequently loaded modules. */
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unsigned int is_symlocal:1; /* module symbols are only available
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locally. */
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} lt_dlinfo;
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LT_SCOPE const lt_dlinfo *lt_dlgetinfo (lt_dlhandle handle);
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LT_SCOPE lt_dlhandle lt_dlhandle_iterate (lt_dlinterface_id iface,
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lt_dlhandle place);
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LT_SCOPE lt_dlhandle lt_dlhandle_fetch (lt_dlinterface_id iface,
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const char *module_name);
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LT_SCOPE int lt_dlhandle_map (lt_dlinterface_id iface,
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int (*func) (lt_dlhandle handle, void *data),
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void *data);
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/* Deprecated module residency management API. */
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LT_SCOPE int lt_dlmakeresident (lt_dlhandle handle);
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LT_SCOPE int lt_dlisresident (lt_dlhandle handle);
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#define lt_ptr void *
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LT_END_C_DECLS
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#endif /*!defined(LTDL_H)*/
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