glib/gmodule/gmodule-win32.c
Tor Lillqvist 30f2323d62 Improve error reporting: When g_module_open() fails, include the name of
2008-09-26  Tor Lillqvist  <tml@novell.com>

	* gmodule-win32.c: Improve error reporting: When g_module_open()
	fails, include the name of the module passed to LoadLibrary() in
	what g_module_error() returns.


svn path=/trunk/; revision=7543
2008-09-26 09:16:25 +00:00

277 lines
6.9 KiB
C

/* GMODULE - GLIB wrapper code for dynamic module loading
* Copyright (C) 1998, 2000 Tim Janik
*
* Win32 GMODULE implementation
* Copyright (C) 1998 Tor Lillqvist
*
* This library 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.
*
* This library 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 this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
/*
* MT safe
*/
#include "config.h"
#include <stdio.h>
#include <windows.h>
#include <tlhelp32.h>
#ifdef G_WITH_CYGWIN
#include <sys/cygwin.h>
#endif
static void
set_error (const gchar *format,
...)
{
gchar *error;
gchar *detail;
gchar *message;
va_list args;
error = g_win32_error_message (GetLastError ());
va_start (args, format);
detail = g_strdup_vprintf (format, args);
va_end (args);
message = g_strconcat (detail, error, NULL);
g_module_set_error (message);
g_free (message);
g_free (detail);
g_free (error);
}
/* --- functions --- */
static gpointer
_g_module_open (const gchar *file_name,
gboolean bind_lazy,
gboolean bind_local)
{
HINSTANCE handle;
wchar_t *wfilename;
#ifdef G_WITH_CYGWIN
gchar tmp[MAX_PATH];
cygwin_conv_to_win32_path(file_name, tmp);
file_name = tmp;
#endif
wfilename = g_utf8_to_utf16 (file_name, -1, NULL, NULL, NULL);
handle = LoadLibraryW (wfilename);
g_free (wfilename);
if (!handle)
set_error ("`%s': ", file_name);
return handle;
}
static gint dummy;
static gpointer null_module_handle = &dummy;
static gpointer
_g_module_self (void)
{
return null_module_handle;
}
static void
_g_module_close (gpointer handle,
gboolean is_unref)
{
if (handle != null_module_handle)
if (!FreeLibrary (handle))
set_error ("");
}
static gpointer
find_in_any_module_using_toolhelp (const gchar *symbol_name)
{
typedef HANDLE (WINAPI *PFNCREATETOOLHELP32SNAPSHOT)(DWORD, DWORD);
static PFNCREATETOOLHELP32SNAPSHOT pfnCreateToolhelp32Snapshot = NULL;
typedef BOOL (WINAPI *PFNMODULE32FIRST)(HANDLE, MODULEENTRY32*);
static PFNMODULE32FIRST pfnModule32First= NULL;
typedef BOOL (WINAPI *PFNMODULE32NEXT)(HANDLE, MODULEENTRY32*);
static PFNMODULE32NEXT pfnModule32Next = NULL;
static HMODULE kernel32;
HANDLE snapshot;
MODULEENTRY32 me32;
gpointer p;
if (!pfnCreateToolhelp32Snapshot || !pfnModule32First || !pfnModule32Next)
{
if (!kernel32)
if (!(kernel32 = GetModuleHandle ("kernel32.dll")))
return NULL;
if (!(pfnCreateToolhelp32Snapshot = (PFNCREATETOOLHELP32SNAPSHOT) GetProcAddress (kernel32, "CreateToolhelp32Snapshot"))
|| !(pfnModule32First = (PFNMODULE32FIRST) GetProcAddress (kernel32, "Module32First"))
|| !(pfnModule32Next = (PFNMODULE32NEXT) GetProcAddress (kernel32, "Module32Next")))
return NULL;
}
if ((snapshot = (*pfnCreateToolhelp32Snapshot) (TH32CS_SNAPMODULE, 0)) == (HANDLE) -1)
return NULL;
me32.dwSize = sizeof (me32);
p = NULL;
if ((*pfnModule32First) (snapshot, &me32))
{
do {
if ((p = GetProcAddress (me32.hModule, symbol_name)) != NULL)
break;
} while ((*pfnModule32Next) (snapshot, &me32));
}
CloseHandle (snapshot);
return p;
}
static gpointer
find_in_any_module_using_psapi (const gchar *symbol_name)
{
static HMODULE psapi = NULL;
typedef BOOL (WINAPI *PFNENUMPROCESSMODULES) (HANDLE, HMODULE *, DWORD, LPDWORD) ;
static PFNENUMPROCESSMODULES pfnEnumProcessModules = NULL;
HMODULE *modules;
HMODULE dummy;
gint i, size;
DWORD needed;
gpointer p;
if (!pfnEnumProcessModules)
{
if (!psapi)
if ((psapi = LoadLibrary ("psapi.dll")) == NULL)
return NULL;
if (!(pfnEnumProcessModules = (PFNENUMPROCESSMODULES) GetProcAddress (psapi, "EnumProcessModules")))
return NULL;
}
if (!(*pfnEnumProcessModules) (GetCurrentProcess (), &dummy,
sizeof (HMODULE), &needed))
return NULL;
size = needed + 10 * sizeof (HMODULE);
modules = g_malloc (size);
if (!(*pfnEnumProcessModules) (GetCurrentProcess (), modules,
size, &needed)
|| needed > size)
{
g_free (modules);
return NULL;
}
p = NULL;
for (i = 0; i < needed / sizeof (HMODULE); i++)
if ((p = GetProcAddress (modules[i], symbol_name)) != NULL)
break;
g_free (modules);
return p;
}
static gpointer
find_in_any_module (const gchar *symbol_name)
{
gpointer result;
if ((result = find_in_any_module_using_toolhelp (symbol_name)) == NULL
&& (result = find_in_any_module_using_psapi (symbol_name)) == NULL)
return NULL;
else
return result;
}
static gpointer
_g_module_symbol (gpointer handle,
const gchar *symbol_name)
{
gpointer p;
if (handle == null_module_handle)
{
if ((p = GetProcAddress (GetModuleHandle (NULL), symbol_name)) == NULL)
p = find_in_any_module (symbol_name);
}
else
p = GetProcAddress (handle, symbol_name);
if (!p)
set_error ("");
return p;
}
static gchar*
_g_module_build_path (const gchar *directory,
const gchar *module_name)
{
gint k;
k = strlen (module_name);
if (directory && *directory)
if (k > 4 && g_ascii_strcasecmp (module_name + k - 4, ".dll") == 0)
return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, NULL);
#ifdef G_WITH_CYGWIN
else if (strncmp (module_name, "lib", 3) == 0 || strncmp (module_name, "cyg", 3) == 0)
return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, ".dll", NULL);
else
return g_strconcat (directory, G_DIR_SEPARATOR_S, "cyg", module_name, ".dll", NULL);
#else
else if (strncmp (module_name, "lib", 3) == 0)
return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, ".dll", NULL);
else
return g_strconcat (directory, G_DIR_SEPARATOR_S, "lib", module_name, ".dll", NULL);
#endif
else if (k > 4 && g_ascii_strcasecmp (module_name + k - 4, ".dll") == 0)
return g_strdup (module_name);
#ifdef G_WITH_CYGWIN
else if (strncmp (module_name, "lib", 3) == 0 || strncmp (module_name, "cyg", 3) == 0)
return g_strconcat (module_name, ".dll", NULL);
else
return g_strconcat ("cyg", module_name, ".dll", NULL);
#else
else if (strncmp (module_name, "lib", 3) == 0)
return g_strconcat (module_name, ".dll", NULL);
else
return g_strconcat ("lib", module_name, ".dll", NULL);
#endif
}