Import Upstream version 2.72.4
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237
gmodule/gmodule-win32.c
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237
gmodule/gmodule-win32.c
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/* GMODULE - GLIB wrapper code for dynamic module loading
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* Copyright (C) 1998, 2000 Tim Janik
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*
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* Win32 GMODULE implementation
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* Copyright (C) 1998 Tor Lillqvist
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*
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* This library 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 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Modified by the GLib Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GLib Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GLib at ftp://ftp.gtk.org/pub/gtk/.
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*/
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/*
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* MT safe
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*/
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#include "config.h"
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#include <glib.h>
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#include <stdio.h>
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#include <windows.h>
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#include <tlhelp32.h>
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#ifdef G_WITH_CYGWIN
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#include <sys/cygwin.h>
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#endif
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static void G_GNUC_PRINTF (2, 3)
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set_error (GError **error,
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const gchar *format,
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...)
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{
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gchar *win32_error;
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gchar *detail;
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gchar *message;
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va_list args;
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win32_error = g_win32_error_message (GetLastError ());
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va_start (args, format);
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detail = g_strdup_vprintf (format, args);
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va_end (args);
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message = g_strconcat (detail, win32_error, NULL);
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g_module_set_error (message);
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g_set_error_literal (error, G_MODULE_ERROR, G_MODULE_ERROR_FAILED, message);
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g_free (message);
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g_free (detail);
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g_free (win32_error);
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}
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/* --- functions --- */
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static gpointer
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_g_module_open (const gchar *file_name,
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gboolean bind_lazy,
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gboolean bind_local,
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GError **error)
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{
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HINSTANCE handle;
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wchar_t *wfilename;
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DWORD old_mode;
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BOOL success;
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#ifdef G_WITH_CYGWIN
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gchar tmp[MAX_PATH];
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cygwin_conv_to_win32_path(file_name, tmp);
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file_name = tmp;
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#endif
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wfilename = g_utf8_to_utf16 (file_name, -1, NULL, NULL, NULL);
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/* suppress error dialog */
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success = SetThreadErrorMode (SEM_NOOPENFILEERRORBOX | SEM_FAILCRITICALERRORS, &old_mode);
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if (!success)
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set_error (error, "");
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/* When building for UWP, load app asset DLLs instead of filesystem DLLs.
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* Needs MSVC, Windows 8 and newer, and is only usable from apps. */
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#if _WIN32_WINNT >= 0x0602 && defined(G_WINAPI_ONLY_APP)
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handle = LoadPackagedLibrary (wfilename, 0);
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#else
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handle = LoadLibraryW (wfilename);
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#endif
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if (success)
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SetThreadErrorMode (old_mode, NULL);
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g_free (wfilename);
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if (!handle)
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set_error (error, "'%s': ", file_name);
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return handle;
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}
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static gint dummy;
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static gpointer null_module_handle = &dummy;
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static gpointer
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_g_module_self (void)
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{
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return null_module_handle;
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}
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static void
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_g_module_close (gpointer handle)
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{
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if (handle != null_module_handle)
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if (!FreeLibrary (handle))
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set_error (NULL, "");
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}
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static gpointer
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find_in_any_module_using_toolhelp (const gchar *symbol_name)
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{
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HANDLE snapshot;
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MODULEENTRY32 me32;
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gpointer p = NULL;
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/* Under UWP, Module32Next and Module32First are not available since we're
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* not allowed to search in the address space of arbitrary loaded DLLs */
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#if !defined(G_WINAPI_ONLY_APP)
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/* https://docs.microsoft.com/en-us/windows/win32/api/tlhelp32/nf-tlhelp32-createtoolhelp32snapshot#remarks
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* If the function fails with ERROR_BAD_LENGTH, retry the function until it succeeds. */
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while (TRUE)
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{
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snapshot = CreateToolhelp32Snapshot (TH32CS_SNAPMODULE, 0);
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if (snapshot == INVALID_HANDLE_VALUE && GetLastError () == ERROR_BAD_LENGTH)
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{
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g_thread_yield ();
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continue;
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}
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break;
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}
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if (snapshot == INVALID_HANDLE_VALUE)
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return NULL;
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me32.dwSize = sizeof (me32);
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p = NULL;
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if (Module32First (snapshot, &me32))
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{
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do {
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if ((p = GetProcAddress (me32.hModule, symbol_name)) != NULL)
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break;
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} while (Module32Next (snapshot, &me32));
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}
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CloseHandle (snapshot);
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#endif
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return p;
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}
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static gpointer
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find_in_any_module (const gchar *symbol_name)
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{
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gpointer result;
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if ((result = find_in_any_module_using_toolhelp (symbol_name)) == NULL)
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return NULL;
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else
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return result;
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}
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static gpointer
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_g_module_symbol (gpointer handle,
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const gchar *symbol_name)
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{
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gpointer p;
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if (handle == null_module_handle)
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{
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if ((p = GetProcAddress (GetModuleHandle (NULL), symbol_name)) == NULL)
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p = find_in_any_module (symbol_name);
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}
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else
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p = GetProcAddress (handle, symbol_name);
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if (!p)
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set_error (NULL, "");
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return p;
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}
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static gchar*
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_g_module_build_path (const gchar *directory,
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const gchar *module_name)
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{
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gint k;
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k = strlen (module_name);
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if (directory && *directory)
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if (k > 4 && g_ascii_strcasecmp (module_name + k - 4, ".dll") == 0)
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return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, NULL);
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#ifdef G_WITH_CYGWIN
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else if (strncmp (module_name, "lib", 3) == 0 || strncmp (module_name, "cyg", 3) == 0)
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return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, ".dll", NULL);
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else
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return g_strconcat (directory, G_DIR_SEPARATOR_S, "cyg", module_name, ".dll", NULL);
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#else
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else if (strncmp (module_name, "lib", 3) == 0)
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return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, ".dll", NULL);
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else
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return g_strconcat (directory, G_DIR_SEPARATOR_S, "lib", module_name, ".dll", NULL);
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#endif
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else if (k > 4 && g_ascii_strcasecmp (module_name + k - 4, ".dll") == 0)
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return g_strdup (module_name);
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#ifdef G_WITH_CYGWIN
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else if (strncmp (module_name, "lib", 3) == 0 || strncmp (module_name, "cyg", 3) == 0)
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return g_strconcat (module_name, ".dll", NULL);
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else
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return g_strconcat ("cyg", module_name, ".dll", NULL);
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#else
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else if (strncmp (module_name, "lib", 3) == 0)
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return g_strconcat (module_name, ".dll", NULL);
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else
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return g_strconcat ("lib", module_name, ".dll", NULL);
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#endif
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}
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