mirror of
https://github.com/matrix-construct/construct
synced 2024-09-06 16:55:22 +02:00
222 lines
6.6 KiB
C
222 lines
6.6 KiB
C
/* 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;
|
|
}
|