diff options
Diffstat (limited to 'libltdl/loaders/load_add_on.c')
| -rw-r--r-- | libltdl/loaders/load_add_on.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/libltdl/loaders/load_add_on.c b/libltdl/loaders/load_add_on.c new file mode 100644 index 0000000..b070906 --- /dev/null +++ b/libltdl/loaders/load_add_on.c @@ -0,0 +1,167 @@ +/* loader-load_add_on.c -- dynamic linking for BeOS + + Copyright (C) 1998-2000, 2004, 2006-2008, 2011-2015 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 loader_data LT__UNUSED) +{ + 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 loader_data LT__UNUSED, const char *filename, + lt_dladvise advise LT__UNUSED) +{ + 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 loader_data LT__UNUSED, 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 loader_data LT__UNUSED, 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; +} |