kopia lustrzana https://github.com/Hamlib/Hamlib
252 wiersze
6.6 KiB
C
252 wiersze
6.6 KiB
C
/* loader-loadlibrary.c -- dynamic linking for Win32
|
|
|
|
Copyright (C) 1998, 1999, 2000, 2004, 2005, 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"
|
|
|
|
#if defined(__CYGWIN__)
|
|
# include <sys/cygwin.h>
|
|
#endif
|
|
|
|
/* 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 loadlibrary_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_dlinterface_id iface_id = 0;
|
|
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);
|
|
iface_id = lt_dlinterface_register ("ltdl loadlibrary", NULL);
|
|
}
|
|
|
|
if (vtable && !vtable->name)
|
|
{
|
|
vtable->name = "lt_loadlibrary";
|
|
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 <windows.h>
|
|
|
|
/* 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)
|
|
{
|
|
lt_module module = 0;
|
|
char *ext;
|
|
char wpath[MAX_PATH];
|
|
size_t len;
|
|
|
|
if (!filename)
|
|
{
|
|
/* Get the name of main module */
|
|
*wpath = 0;
|
|
GetModuleFileName (NULL, wpath, sizeof (wpath));
|
|
filename = wpath;
|
|
}
|
|
else
|
|
{
|
|
len = LT_STRLEN (filename);
|
|
|
|
if (len >= MAX_PATH)
|
|
{
|
|
LT__SETERROR (CANNOT_OPEN);
|
|
return 0;
|
|
}
|
|
|
|
#if HAVE_DECL_CYGWIN_CONV_PATH
|
|
if (cygwin_conv_path (CCP_POSIX_TO_WIN_A, filename, wpath, MAX_PATH))
|
|
{
|
|
LT__SETERROR (CANNOT_OPEN);
|
|
return 0;
|
|
}
|
|
len = 0;
|
|
#elif defined(__CYGWIN__)
|
|
cygwin_conv_to_full_win32_path (filename, wpath);
|
|
len = 0;
|
|
#else
|
|
strcpy(wpath, filename);
|
|
#endif
|
|
|
|
ext = strrchr (wpath, '.');
|
|
if (!ext)
|
|
{
|
|
/* Append a `.' to stop Windows from adding an
|
|
implicit `.dll' extension. */
|
|
if (!len)
|
|
len = LT_STRLEN (wpath);
|
|
|
|
if (len + 1 >= MAX_PATH)
|
|
{
|
|
LT__SETERROR (CANNOT_OPEN);
|
|
return 0;
|
|
}
|
|
|
|
wpath[len] = '.';
|
|
wpath[len+1] = '\0';
|
|
}
|
|
}
|
|
|
|
{
|
|
/* Silence dialog from LoadLibrary on some failures.
|
|
No way to get the error mode, but to set it,
|
|
so set it twice to preserve any previous flags. */
|
|
UINT errormode = SetErrorMode(SEM_FAILCRITICALERRORS);
|
|
SetErrorMode(errormode | SEM_FAILCRITICALERRORS);
|
|
|
|
module = LoadLibrary (wpath);
|
|
|
|
/* Restore the error mode. */
|
|
SetErrorMode(errormode);
|
|
}
|
|
|
|
/* libltdl expects this function to fail if it is unable
|
|
to physically load the library. Sadly, LoadLibrary
|
|
will search the loaded libraries for a match and return
|
|
one of them if the path search load fails.
|
|
|
|
We check whether LoadLibrary is returning a handle to
|
|
an already loaded module, and simulate failure if we
|
|
find one. */
|
|
{
|
|
lt_dlhandle cur = 0;
|
|
|
|
while ((cur = lt_dlhandle_iterate (iface_id, cur)))
|
|
{
|
|
if (!cur->module)
|
|
{
|
|
cur = 0;
|
|
break;
|
|
}
|
|
|
|
if (cur->module == module)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (cur || !module)
|
|
{
|
|
LT__SETERROR (CANNOT_OPEN);
|
|
module = 0;
|
|
}
|
|
}
|
|
|
|
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 (FreeLibrary((HMODULE) 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 = (void *) GetProcAddress ((HMODULE) module, name);
|
|
|
|
if (!address)
|
|
{
|
|
LT__SETERROR (SYMBOL_NOT_FOUND);
|
|
}
|
|
|
|
return address;
|
|
}
|