mirror of
https://github.com/matrix-construct/construct
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167 lines
4.7 KiB
C
167 lines
4.7 KiB
C
/* loader-load_add_on.c -- dynamic linking for BeOS
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Copyright (C) 1998, 1999, 2000, 2004, 2006,
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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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#include "lt__private.h"
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#include "lt_dlloader.h"
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/* Use the preprocessor to rename non-static symbols to avoid namespace
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collisions when the loader code is statically linked into libltdl.
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Use the "<module_name>_LTX_" prefix so that the symbol addresses can
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be fetched from the preloaded symbol list by lt_dlsym(): */
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#define get_vtable load_add_on_LTX_get_vtable
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LT_BEGIN_C_DECLS
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LT_SCOPE lt_dlvtable *get_vtable (lt_user_data loader_data);
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LT_END_C_DECLS
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/* Boilerplate code to set up the vtable for hooking this loader into
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libltdl's loader list: */
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static int vl_exit (lt_user_data loader_data);
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static lt_module vm_open (lt_user_data loader_data, const char *filename,
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lt_dladvise advise);
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static int vm_close (lt_user_data loader_data, lt_module module);
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static void * vm_sym (lt_user_data loader_data, lt_module module,
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const char *symbolname);
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static lt_dlvtable *vtable = 0;
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/* Return the vtable for this loader, only the name and sym_prefix
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attributes (plus the virtual function implementations, obviously)
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change between loaders. */
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lt_dlvtable *
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get_vtable (lt_user_data loader_data)
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{
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if (!vtable)
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{
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vtable = lt__zalloc (sizeof *vtable);
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}
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if (vtable && !vtable->name)
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{
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vtable->name = "lt_load_add_on";
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vtable->module_open = vm_open;
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vtable->module_close = vm_close;
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vtable->find_sym = vm_sym;
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vtable->dlloader_exit = vl_exit;
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vtable->dlloader_data = loader_data;
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vtable->priority = LT_DLLOADER_APPEND;
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}
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if (vtable && (vtable->dlloader_data != loader_data))
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{
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LT__SETERROR (INIT_LOADER);
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return 0;
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}
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return vtable;
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}
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/* --- IMPLEMENTATION --- */
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#include <kernel/image.h>
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/* A function called through the vtable when this loader is no
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longer needed by the application. */
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static int
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vl_exit (lt_user_data LT__UNUSED loader_data)
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{
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vtable = NULL;
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return 0;
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}
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/* A function called through the vtable to open a module with this
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loader. Returns an opaque representation of the newly opened
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module for processing with this loader's other vtable functions. */
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static lt_module
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vm_open (lt_user_data LT__UNUSED loader_data, const char *filename,
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lt_dladvise LT__UNUSED advise)
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{
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image_id image = 0;
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if (filename)
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{
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image = load_add_on (filename);
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}
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else
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{
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image_info info;
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int32 cookie = 0;
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if (get_next_image_info (0, &cookie, &info) == B_OK)
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image = load_add_on (info.name);
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}
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if (image <= 0)
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{
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LT__SETERROR (CANNOT_OPEN);
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image = 0;
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}
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return (lt_module) image;
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}
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/* A function called through the vtable when a particular module
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should be unloaded. */
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static int
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vm_close (lt_user_data LT__UNUSED loader_data, lt_module module)
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{
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int errors = 0;
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if (unload_add_on ((image_id) module) != B_OK)
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{
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LT__SETERROR (CANNOT_CLOSE);
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++errors;
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}
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return errors;
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}
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/* A function called through the vtable to get the address of
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a symbol loaded from a particular module. */
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static void *
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vm_sym (lt_user_data LT__UNUSED loader_data, lt_module module, const char *name)
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{
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void *address = 0;
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image_id image = (image_id) module;
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if (get_image_symbol (image, name, B_SYMBOL_TYPE_ANY, address) != B_OK)
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{
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LT__SETERROR (SYMBOL_NOT_FOUND);
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address = 0;
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}
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return address;
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}
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