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/* loader-loadlibrary.c -- dynamic linking for Win32
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Copyright (C) 1998, 1999, 2000, 2004, 2005, 2006,
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2007, 2008 Free Software Foundation, Inc.
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Written by Thomas Tanner, 1998
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NOTE: The canonical source of this file is maintained with the
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GNU Libtool package. Report bugs to bug-libtool@gnu.org.
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GNU Libltdl is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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As a special exception to the GNU Lesser General Public License,
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if you distribute this file as part of a program or library that
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is built using GNU Libtool, you may include this file under the
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same distribution terms that you use for the rest of that program.
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GNU Libltdl is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with GNU Libltdl; see the file COPYING.LIB. If not, a
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copy can be downloaded from http://www.gnu.org/licenses/lgpl.html,
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or obtained by writing to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#include "lt__private.h"
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#include "lt_dlloader.h"
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#if defined(__CYGWIN__)
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# include <sys/cygwin.h>
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/* Use the preprocessor to rename non-static symbols to avoid namespace
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collisions when the loader code is statically linked into libltdl.
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Use the "<module_name>_LTX_" prefix so that the symbol addresses can
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be fetched from the preloaded symbol list by lt_dlsym(): */
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#define get_vtable loadlibrary_LTX_get_vtable
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LT_SCOPE lt_dlvtable *get_vtable (lt_user_data loader_data);
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/* Boilerplate code to set up the vtable for hooking this loader into
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libltdl's loader list: */
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static int vl_exit (lt_user_data loader_data);
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static lt_module vm_open (lt_user_data loader_data, const char *filename,
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static int vm_close (lt_user_data loader_data, lt_module module);
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static void * vm_sym (lt_user_data loader_data, lt_module module,
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const char *symbolname);
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static lt_dlinterface_id iface_id = 0;
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static lt_dlvtable *vtable = 0;
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/* Return the vtable for this loader, only the name and sym_prefix
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attributes (plus the virtual function implementations, obviously)
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change between loaders. */
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get_vtable (lt_user_data loader_data)
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vtable = (lt_dlvtable *) lt__zalloc (sizeof *vtable);
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iface_id = lt_dlinterface_register ("ltdl loadlibrary", NULL);
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if (vtable && !vtable->name)
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vtable->name = "lt_loadlibrary";
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vtable->module_open = vm_open;
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vtable->module_close = vm_close;
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vtable->find_sym = vm_sym;
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vtable->dlloader_exit = vl_exit;
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vtable->dlloader_data = loader_data;
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vtable->priority = LT_DLLOADER_APPEND;
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if (vtable && (vtable->dlloader_data != loader_data))
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LT__SETERROR (INIT_LOADER);
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/* --- IMPLEMENTATION --- */
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/* A function called through the vtable when this loader is no
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longer needed by the application. */
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vl_exit (lt_user_data LT__UNUSED loader_data)
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/* A function called through the vtable to open a module with this
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loader. Returns an opaque representation of the newly opened
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module for processing with this loader's other vtable functions. */
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vm_open (lt_user_data LT__UNUSED loader_data, const char *filename,
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lt_dladvise LT__UNUSED advise)
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lt_module module = 0;
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char wpath[MAX_PATH];
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/* Get the name of main module */
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GetModuleFileName (NULL, wpath, sizeof (wpath));
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len = LT_STRLEN (filename);
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LT__SETERROR (CANNOT_OPEN);
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#if HAVE_DECL_CYGWIN_CONV_PATH
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if (cygwin_conv_path (CCP_POSIX_TO_WIN_A, filename, wpath, MAX_PATH))
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LT__SETERROR (CANNOT_OPEN);
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#elif defined(__CYGWIN__)
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cygwin_conv_to_full_win32_path (filename, wpath);
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strcpy(wpath, filename);
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ext = strrchr (wpath, '.');
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/* Append a `.' to stop Windows from adding an
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implicit `.dll' extension. */
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len = LT_STRLEN (wpath);
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if (len + 1 >= MAX_PATH)
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LT__SETERROR (CANNOT_OPEN);
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/* Silence dialog from LoadLibrary on some failures.
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No way to get the error mode, but to set it,
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so set it twice to preserve any previous flags. */
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UINT errormode = SetErrorMode(SEM_FAILCRITICALERRORS);
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SetErrorMode(errormode | SEM_FAILCRITICALERRORS);
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module = LoadLibrary (wpath);
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/* Restore the error mode. */
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SetErrorMode(errormode);
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/* libltdl expects this function to fail if it is unable
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to physically load the library. Sadly, LoadLibrary
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will search the loaded libraries for a match and return
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one of them if the path search load fails.
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We check whether LoadLibrary is returning a handle to
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an already loaded module, and simulate failure if we
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while ((cur = lt_dlhandle_iterate (iface_id, cur)))
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if (cur->module == module)
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LT__SETERROR (CANNOT_OPEN);
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/* A function called through the vtable when a particular module
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should be unloaded. */
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vm_close (lt_user_data LT__UNUSED loader_data, lt_module module)
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if (FreeLibrary((HMODULE) module) == 0)
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LT__SETERROR (CANNOT_CLOSE);
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/* A function called through the vtable to get the address of
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a symbol loaded from a particular module. */
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vm_sym (lt_user_data LT__UNUSED loader_data, lt_module module, const char *name)
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void *address = (void *) GetProcAddress ((HMODULE) module, name);
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LT__SETERROR (SYMBOL_NOT_FOUND);