VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/win/dllmain-win.cpp@ 103795

Last change on this file since 103795 was 98103, checked in by vboxsync, 23 months ago

Copyright year updates by scm.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id Revision
File size: 3.1 KB
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1/* $Id: dllmain-win.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2/** @file
3 * IPRT - Win32 DllMain (Ring-3).
4 */
5
6/*
7 * Copyright (C) 2006-2023 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#include <iprt/win/windows.h>
42#include <iprt/thread.h>
43#include <iprt/param.h>
44#include "internal/thread.h"
45
46
47
48/**
49 * Increases the load count on the IPRT DLL so it won't unload.
50 *
51 * This is a separate function so as to not overflow the stack of threads with
52 * very little of it.
53 *
54 * @param hModule The IPRT DLL module handle.
55 */
56DECL_NO_INLINE(static, void) EnsureNoUnload(HMODULE hModule)
57{
58 WCHAR wszName[RTPATH_MAX];
59 SetLastError(NO_ERROR);
60 if ( GetModuleFileNameW(hModule, wszName, RT_ELEMENTS(wszName)) > 0
61 && GetLastError() == NO_ERROR)
62 {
63 int cExtraLoads = 32;
64 while (cExtraLoads-- > 0)
65 LoadLibraryW(wszName);
66 }
67}
68
69
70/**
71 * The Dll main entry point.
72 */
73BOOL __stdcall DllMain(HANDLE hModule, DWORD dwReason, PVOID pvReserved)
74{
75 RT_NOREF_PV(pvReserved);
76
77 switch (dwReason)
78 {
79 /*
80 * When attaching to a process, we'd like to make sure IPRT stays put
81 * and doesn't get unloaded.
82 */
83 case DLL_PROCESS_ATTACH:
84 EnsureNoUnload((HMODULE)hModule);
85 break;
86
87 case DLL_PROCESS_DETACH:
88 case DLL_THREAD_ATTACH:
89 default:
90 /* ignore */
91 break;
92
93 case DLL_THREAD_DETACH:
94 rtThreadWinTlsDestruction();
95 rtThreadNativeDetach();
96 break;
97 }
98 return TRUE;
99}
100
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