+++ /dev/null
-/* loader-dlopen.c -- dynamic linking with dlopen/dlsym
-
- 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 dlopen_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_dlvtable *) lt__zalloc (sizeof *vtable);
- }
-
- if (vtable && !vtable->name)
- {
- vtable->name = "lt_dlopen";
-#if defined(DLSYM_USCORE)
- vtable->sym_prefix = "_";
-#endif
- 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_PREPEND;
- }
-
- if (vtable && (vtable->dlloader_data != loader_data))
- {
- LT__SETERROR (INIT_LOADER);
- return 0;
- }
-
- return vtable;
-}
-
-
-
-/* --- IMPLEMENTATION --- */
-
-
-#if defined(HAVE_DLFCN_H)
-# include <dlfcn.h>
-#endif
-
-#if defined(HAVE_SYS_DL_H)
-# include <sys/dl.h>
-#endif
-
-
-/* We may have to define LT_LAZY_OR_NOW in the command line if we
- find out it does not work in some platform. */
-#if !defined(LT_LAZY_OR_NOW)
-# if defined(RTLD_LAZY)
-# define LT_LAZY_OR_NOW RTLD_LAZY
-# else
-# if defined(DL_LAZY)
-# define LT_LAZY_OR_NOW DL_LAZY
-# endif
-# endif /* !RTLD_LAZY */
-#endif
-#if !defined(LT_LAZY_OR_NOW)
-# if defined(RTLD_NOW)
-# define LT_LAZY_OR_NOW RTLD_NOW
-# else
-# if defined(DL_NOW)
-# define LT_LAZY_OR_NOW DL_NOW
-# endif
-# endif /* !RTLD_NOW */
-#endif
-#if !defined(LT_LAZY_OR_NOW)
-# define LT_LAZY_OR_NOW 0
-#endif /* !LT_LAZY_OR_NOW */
-
-/* We only support local and global symbols from modules for loaders
- that provide such a thing, otherwise the system default is used. */
-#if !defined(RTLD_GLOBAL)
-# if defined(DL_GLOBAL)
-# define RTLD_GLOBAL DL_GLOBAL
-# endif
-#endif /* !RTLD_GLOBAL */
-#if !defined(RTLD_LOCAL)
-# if defined(DL_LOCAL)
-# define RTLD_LOCAL DL_LOCAL
-# endif
-#endif /* !RTLD_LOCAL */
-
-#if defined(HAVE_DLERROR)
-# define DLERROR(arg) dlerror ()
-#else
-# define DLERROR(arg) LT__STRERROR (arg)
-#endif
-
-#define DL__SETERROR(errorcode) \
- LT__SETERRORSTR (DLERROR (errorcode))
-
-
-/* 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 advise)
-{
- int module_flags = LT_LAZY_OR_NOW;
- lt_module module;
-
- if (advise)
- {
-#ifdef RTLD_GLOBAL
- /* If there is some means of asking for global symbol resolution,
- do so. */
- if (advise->is_symglobal)
- module_flags |= RTLD_GLOBAL;
-#else
- /* Otherwise, reset that bit so the caller can tell it wasn't
- acted on. */
- advise->is_symglobal = 0;
-#endif
-
-/* And similarly for local only symbol resolution. */
-#ifdef RTLD_LOCAL
- if (advise->is_symlocal)
- module_flags |= RTLD_LOCAL;
-#else
- advise->is_symlocal = 0;
-#endif
- }
-
- module = dlopen (filename, module_flags);
-
- if (!module)
- {
- DL__SETERROR (CANNOT_OPEN);
- }
-
- return module;
-}
-
-
-/* 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 (dlclose (module) != 0)
- {
- DL__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 = dlsym (module, name);
-
- if (!address)
- {
- DL__SETERROR (SYMBOL_NOT_FOUND);
- }
-
- return address;
-}
HCoop / hcoop / debian / courier-authlib.git / blobdiff