+++ /dev/null
-/* loader-shl_load.c -- dynamic linking with shl_load (HP-UX)
-
- 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 shl_load_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_shl_load";
- 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 --- */
-
-
-#if defined(HAVE_DL_H)
-# include <dl.h>
-#endif
-
-/* some flags are missing on some systems, so we provide
- * harmless defaults.
- *
- * Mandatory:
- * BIND_IMMEDIATE - Resolve symbol references when the library is loaded.
- * BIND_DEFERRED - Delay code symbol resolution until actual reference.
- *
- * Optionally:
- * BIND_FIRST - Place the library at the head of the symbol search
- * order.
- * BIND_NONFATAL - The default BIND_IMMEDIATE behavior is to treat all
- * unsatisfied symbols as fatal. This flag allows
- * binding of unsatisfied code symbols to be deferred
- * until use.
- * [Perl: For certain libraries, like DCE, deferred
- * binding often causes run time problems. Adding
- * BIND_NONFATAL to BIND_IMMEDIATE still allows
- * unresolved references in situations like this.]
- * BIND_NOSTART - Do not call the initializer for the shared library
- * when the library is loaded, nor on a future call to
- * shl_unload().
- * BIND_VERBOSE - Print verbose messages concerning possible
- * unsatisfied symbols.
- *
- * hp9000s700/hp9000s800:
- * BIND_RESTRICTED - Restrict symbols visible by the library to those
- * present at library load time.
- * DYNAMIC_PATH - Allow the loader to dynamically search for the
- * library specified by the path argument.
- */
-
-#if !defined(DYNAMIC_PATH)
-# define DYNAMIC_PATH 0
-#endif
-#if !defined(BIND_RESTRICTED)
-# define BIND_RESTRICTED 0
-#endif
-
-#define LT_BIND_FLAGS (BIND_IMMEDIATE | BIND_NONFATAL | DYNAMIC_PATH)
-
-
-/* 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)
-{
- static shl_t self = (shl_t) 0;
- lt_module module = shl_load (filename, LT_BIND_FLAGS, 0L);
-
- /* Since searching for a symbol against a NULL module handle will also
- look in everything else that was already loaded and exported with
- the -E compiler flag, we always cache a handle saved before any
- modules are loaded. */
- if (!self)
- {
- void *address;
- shl_findsym (&self, "main", TYPE_UNDEFINED, &address);
- }
-
- if (!filename)
- {
- module = self;
- }
- else
- {
- module = shl_load (filename, LT_BIND_FLAGS, 0L);
-
- if (!module)
- {
- LT__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 (module && (shl_unload ((shl_t) (module)) != 0))
- {
- 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;
-
- /* sys_shl_open should never return a NULL module handle */
- if (module == (lt_module) 0)
- {
- LT__SETERROR (INVALID_HANDLE);
- }
- else if (!shl_findsym((shl_t*) &module, name, TYPE_UNDEFINED, &address))
- {
- if (!address)
- {
- LT__SETERROR (SYMBOL_NOT_FOUND);
- }
- }
-
- return address;
-}
HCoop / hcoop / debian / courier-authlib.git / blobdiff