168 lines
4.7 KiB
C
168 lines
4.7 KiB
C
/* loader-load_add_on.c -- dynamic linking for BeOS
|
|
|
|
Copyright (C) 1998, 1999, 2000, 2004, 2006,
|
|
2007, 2008 Free Software Foundation, Inc.
|
|
Written by Thomas Tanner, 1998
|
|
|
|
NOTE: The canonical source of this file is maintained with the
|
|
GNU Libtool package. Report bugs to bug-libtool@gnu.org.
|
|
|
|
GNU Libltdl is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2 of the License, or (at your option) any later version.
|
|
|
|
As a special exception to the GNU Lesser General Public License,
|
|
if you distribute this file as part of a program or library that
|
|
is built using GNU Libtool, you may include this file under the
|
|
same distribution terms that you use for the rest of that program.
|
|
|
|
GNU Libltdl is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with GNU Libltdl; see the file COPYING.LIB. If not, a
|
|
copy can be downloaded from http://www.gnu.org/licenses/lgpl.html,
|
|
or obtained by writing to the Free Software Foundation, Inc.,
|
|
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include "lt__private.h"
|
|
#include "lt_dlloader.h"
|
|
|
|
/* Use the preprocessor to rename non-static symbols to avoid namespace
|
|
collisions when the loader code is statically linked into libltdl.
|
|
Use the "<module_name>_LTX_" prefix so that the symbol addresses can
|
|
be fetched from the preloaded symbol list by lt_dlsym(): */
|
|
#define get_vtable load_add_on_LTX_get_vtable
|
|
|
|
LT_BEGIN_C_DECLS
|
|
LT_SCOPE lt_dlvtable *get_vtable (lt_user_data loader_data);
|
|
LT_END_C_DECLS
|
|
|
|
|
|
/* Boilerplate code to set up the vtable for hooking this loader into
|
|
libltdl's loader list: */
|
|
static int vl_exit (lt_user_data loader_data);
|
|
static lt_module vm_open (lt_user_data loader_data, const char *filename,
|
|
lt_dladvise advise);
|
|
static int vm_close (lt_user_data loader_data, lt_module module);
|
|
static void * vm_sym (lt_user_data loader_data, lt_module module,
|
|
const char *symbolname);
|
|
|
|
static lt_dlvtable *vtable = 0;
|
|
|
|
/* Return the vtable for this loader, only the name and sym_prefix
|
|
attributes (plus the virtual function implementations, obviously)
|
|
change between loaders. */
|
|
lt_dlvtable *
|
|
get_vtable (lt_user_data loader_data)
|
|
{
|
|
if (!vtable)
|
|
{
|
|
vtable = lt__zalloc (sizeof *vtable);
|
|
}
|
|
|
|
if (vtable && !vtable->name)
|
|
{
|
|
vtable->name = "lt_load_add_on";
|
|
vtable->module_open = vm_open;
|
|
vtable->module_close = vm_close;
|
|
vtable->find_sym = vm_sym;
|
|
vtable->dlloader_exit = vl_exit;
|
|
vtable->dlloader_data = loader_data;
|
|
vtable->priority = LT_DLLOADER_APPEND;
|
|
}
|
|
|
|
if (vtable && (vtable->dlloader_data != loader_data))
|
|
{
|
|
LT__SETERROR (INIT_LOADER);
|
|
return 0;
|
|
}
|
|
|
|
return vtable;
|
|
}
|
|
|
|
|
|
|
|
/* --- IMPLEMENTATION --- */
|
|
|
|
|
|
#include <kernel/image.h>
|
|
|
|
/* A function called through the vtable when this loader is no
|
|
longer needed by the application. */
|
|
static int
|
|
vl_exit (lt_user_data LT__UNUSED loader_data)
|
|
{
|
|
vtable = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/* A function called through the vtable to open a module with this
|
|
loader. Returns an opaque representation of the newly opened
|
|
module for processing with this loader's other vtable functions. */
|
|
static lt_module
|
|
vm_open (lt_user_data LT__UNUSED loader_data, const char *filename,
|
|
lt_dladvise LT__UNUSED advise)
|
|
{
|
|
image_id image = 0;
|
|
|
|
if (filename)
|
|
{
|
|
image = load_add_on (filename);
|
|
}
|
|
else
|
|
{
|
|
image_info info;
|
|
int32 cookie = 0;
|
|
if (get_next_image_info (0, &cookie, &info) == B_OK)
|
|
image = load_add_on (info.name);
|
|
}
|
|
|
|
if (image <= 0)
|
|
{
|
|
LT__SETERROR (CANNOT_OPEN);
|
|
image = 0;
|
|
}
|
|
|
|
return (lt_module) image;
|
|
}
|
|
|
|
|
|
/* A function called through the vtable when a particular module
|
|
should be unloaded. */
|
|
static int
|
|
vm_close (lt_user_data LT__UNUSED loader_data, lt_module module)
|
|
{
|
|
int errors = 0;
|
|
|
|
if (unload_add_on ((image_id) module) != B_OK)
|
|
{
|
|
LT__SETERROR (CANNOT_CLOSE);
|
|
++errors;
|
|
}
|
|
|
|
return errors;
|
|
}
|
|
|
|
|
|
/* A function called through the vtable to get the address of
|
|
a symbol loaded from a particular module. */
|
|
static void *
|
|
vm_sym (lt_user_data LT__UNUSED loader_data, lt_module module, const char *name)
|
|
{
|
|
void *address = 0;
|
|
image_id image = (image_id) module;
|
|
|
|
if (get_image_symbol (image, name, B_SYMBOL_TYPE_ANY, address) != B_OK)
|
|
{
|
|
LT__SETERROR (SYMBOL_NOT_FOUND);
|
|
address = 0;
|
|
}
|
|
|
|
return address;
|
|
}
|