ServerExe/HookDll/hookdll.c

/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Seamless windows - Remote server hook DLL

   Based on code copyright (C) 2004-2005 Martin Wickett

   Copyright (C) Peter Åstrand <astrand@cendio.se> 2005-2006
   Copyright (C) Pierre Ossman <ossman@cendio.se> 2006

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <stdio.h>
#include <stdarg.h>

#include <windows.h>
#include <winuser.h>

#include "../vchannel.h"

#define DLL_EXPORT __declspec(dllexport)

#ifdef __GNUC__
#define SHARED __attribute__((section ("SHAREDDATA"), shared))
#else
#define SHARED
#endif

// Shared DATA
#pragma data_seg ( "SHAREDDATA" )

// this is the total number of processes this dll is currently attached to
int g_instance_count SHARED = 0;

// blocks for locally generated events
RECT g_block_move SHARED = { 0, 0, 0, 0 };

#pragma data_seg ()

#pragma comment(linker, "/section:SHAREDDATA,rws")

static HHOOK g_cbt_hook = NULL;
static HHOOK g_wndproc_hook = NULL;
static HHOOK g_wndprocret_hook = NULL;

static HINSTANCE g_instance = NULL;

static HANDLE g_mutex = NULL;

static void
update_position(HWND hwnd)
{
        RECT rect, blocked;

        if (!GetWindowRect(hwnd, &rect))
        {
                debug("GetWindowRect failed!\n");
                return;
        }

        WaitForSingleObject(g_mutex, INFINITE);
        memcpy(&blocked, &g_block_move, sizeof(RECT));
        ReleaseMutex(g_mutex);

        if ((rect.left == blocked.left) && (rect.top == blocked.top)
            && (rect.right == blocked.right) && (rect.bottom == blocked.bottom))
                return;

        vchannel_write("POSITION,0x%p,%d,%d,%d,%d,0x%x",
                       hwnd,
                       rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, 0);
}

static LRESULT CALLBACK
wndproc_hook_proc(int code, WPARAM cur_thread, LPARAM details)
{
        HWND hwnd, parent;
        UINT msg;
        WPARAM wparam;
        LPARAM lparam;

        LONG style;

        if (code < 0)
                goto end;

        hwnd = ((CWPSTRUCT *) details)->hwnd;
        msg = ((CWPSTRUCT *) details)->message;
        wparam = ((CWPSTRUCT *) details)->wParam;
        lparam = ((CWPSTRUCT *) details)->lParam;

        style = GetWindowLong(hwnd, GWL_STYLE);

        /* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
           but they exist nonetheless. */
        if ((style & WS_CHILD) && !(style & WS_POPUP))
                goto end;

        if (style & WS_POPUP)
        {
                parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);
                if (!parent)
                        parent = (HWND) - 1;
        }
        else
                parent = NULL;

        switch (msg)
        {

                case WM_WINDOWPOSCHANGED:
                        {
                                WINDOWPOS *wp = (WINDOWPOS *) lparam;

                                if (wp->flags & SWP_SHOWWINDOW)
                                {
                                        unsigned short title[150];
                                        int state;

                                        vchannel_write("CREATE,0x%p,0x%p,0x%x", hwnd, parent, 0);

                                        GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));

                                        vchannel_write("TITLE,0x%x,%s,0x%x", hwnd,
                                                       vchannel_strfilter_unicode(title), 0);

                                        if (style & WS_MAXIMIZE)
                                                state = 2;
                                        else if (style & WS_MINIMIZE)
                                                state = 1;
                                        else
                                                state = 0;

                                        update_position(hwnd);

                                        vchannel_write("STATE,0x%p,0x%x,0x%x", hwnd, state, 0);
                                }

                                if (wp->flags & SWP_HIDEWINDOW)
                                        vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);

                                if (!(style & WS_VISIBLE) || (style & WS_MINIMIZE))
                                        break;

                                if (!(wp->flags & SWP_NOMOVE && wp->flags & SWP_NOSIZE))
                                        update_position(hwnd);

                                if (!(wp->flags & SWP_NOZORDER))
                                {
                                        vchannel_write("ZCHANGE,0x%p,0x%p,0x%x",
                                                       hwnd,
                                                       wp->flags & SWP_NOACTIVATE ? wp->
                                                       hwndInsertAfter : 0, 0);
                                }

                                break;
                        }

                case WM_SIZE:
                        if (!(style & WS_VISIBLE) || (style & WS_MINIMIZE))
                                break;
                        update_position(hwnd);
                        break;

                case WM_MOVE:
                        if (!(style & WS_VISIBLE) || (style & WS_MINIMIZE))
                                break;
                        update_position(hwnd);
                        break;

                case WM_DESTROY:
                        if (!(style & WS_VISIBLE))
                                break;
                        vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);
                        break;

                default:
                        break;
        }

      end:
        return CallNextHookEx(g_wndproc_hook, code, cur_thread, details);
}

static LRESULT CALLBACK
wndprocret_hook_proc(int code, WPARAM cur_thread, LPARAM details)
{
        HWND hwnd, parent;
        UINT msg;
        WPARAM wparam;
        LPARAM lparam;

        LONG style;

        if (code < 0)
                goto end;

        hwnd = ((CWPRETSTRUCT *) details)->hwnd;
        msg = ((CWPRETSTRUCT *) details)->message;
        wparam = ((CWPRETSTRUCT *) details)->wParam;
        lparam = ((CWPRETSTRUCT *) details)->lParam;

        style = GetWindowLong(hwnd, GWL_STYLE);

        /* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
           but they exist nonetheless. */
        if ((style & WS_CHILD) && !(style & WS_POPUP))
                goto end;

        switch (msg)
        {
                case WM_SETTEXT:
                        {
                                unsigned short title[150];
                                if (!(style & WS_VISIBLE))
                                        break;
                                /* We cannot use the string in lparam because
                                   we need unicode. */
                                GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));
                                vchannel_write("TITLE,0x%p,%s,0x%x", hwnd,
                                               vchannel_strfilter_unicode(title), 0);
                                break;
                        }

                default:
                        break;
        }

      end:
        return CallNextHookEx(g_wndprocret_hook, code, cur_thread, details);
}

static LRESULT CALLBACK
cbt_hook_proc(int code, WPARAM wparam, LPARAM lparam)
{
        if (code < 0)
                goto end;

        switch (code)
        {
                case HCBT_MINMAX:
                        {
                                int show, state;

                                show = LOWORD(lparam);

                                if ((show == SW_NORMAL) || (show == SW_SHOWNORMAL)
                                    || (show == SW_RESTORE))
                                        state = 0;
                                else if ((show == SW_MINIMIZE) || (show == SW_SHOWMINIMIZED))
                                        state = 1;
                                else if ((show == SW_MAXIMIZE) || (show == SW_SHOWMAXIMIZED))
                                        state = 2;
                                else
                                {
                                        debug("Unexpected show: %d", show);
                                        break;
                                }
                                vchannel_write("STATE,0x%p,0x%x,0x%x", (HWND) wparam, state, 0);
                                break;
                        }

                default:
                        break;
        }

      end:
        return CallNextHookEx(g_cbt_hook, code, wparam, lparam);
}

DLL_EXPORT void
SetHooks(void)
{
        if (!g_cbt_hook)
                g_cbt_hook = SetWindowsHookEx(WH_CBT, cbt_hook_proc, g_instance, 0);

        if (!g_wndproc_hook)
                g_wndproc_hook = SetWindowsHookEx(WH_CALLWNDPROC, wndproc_hook_proc, g_instance, 0);

        if (!g_wndprocret_hook)
                g_wndprocret_hook =
                        SetWindowsHookEx(WH_CALLWNDPROCRET, wndprocret_hook_proc, g_instance, 0);
}

DLL_EXPORT void
RemoveHooks(void)
{
        if (g_cbt_hook)
                UnhookWindowsHookEx(g_cbt_hook);

        if (g_wndproc_hook)
                UnhookWindowsHookEx(g_wndproc_hook);

        if (g_wndprocret_hook)
                UnhookWindowsHookEx(g_wndprocret_hook);
}

DLL_EXPORT void
SafeMoveWindow(HWND hwnd, int x, int y, int width, int height)
{
        WaitForSingleObject(g_mutex, INFINITE);
        g_block_move.left = x;
        g_block_move.top = y;
        g_block_move.right = x + width;
        g_block_move.bottom = y + height;
        ReleaseMutex(g_mutex);

        SetWindowPos(hwnd, NULL, x, y, width, height, SWP_NOACTIVATE | SWP_NOZORDER);

        WaitForSingleObject(g_mutex, INFINITE);
        memset(&g_block_move, 0, sizeof(RECT));
        ReleaseMutex(g_mutex);
}

DLL_EXPORT int
GetInstanceCount()
{
        return g_instance_count;
}

BOOL APIENTRY
DllMain(HINSTANCE hinstDLL, DWORD ul_reason_for_call, LPVOID lpReserved)
{
        switch (ul_reason_for_call)
        {
                case DLL_PROCESS_ATTACH:
                        // remember our instance handle
                        g_instance = hinstDLL;

                        g_mutex = CreateMutex(NULL, FALSE, "Local\\SeamlessDLL");
                        if (!g_mutex)
                                return FALSE;

                        WaitForSingleObject(g_mutex, INFINITE);
                        ++g_instance_count;
                        ReleaseMutex(g_mutex);

                        vchannel_open();

                        break;

                case DLL_THREAD_ATTACH:
                        break;

                case DLL_THREAD_DETACH:
                        break;

                case DLL_PROCESS_DETACH:
                        WaitForSingleObject(g_mutex, INFINITE);
                        --g_instance_count;
                        ReleaseMutex(g_mutex);

                        vchannel_close();

                        CloseHandle(g_mutex);

                        break;
        }

        return TRUE;
}
1	ossman_	1071	/* -- c-basic-offset: 8 --
2			rdesktop: A Remote Desktop Protocol client.
3			Seamless windows - Remote server hook DLL
4	ossman_	1069
5	ossman_	1071	Based on code copyright (C) 2004-2005 Martin Wickett
6
7			Copyright (C) Peter Åstrand <astrand@cendio.se> 2005-2006
8			Copyright (C) Pierre Ossman <ossman@cendio.se> 2006
9
10			This program is free software; you can redistribute it and/or modify
11			it under the terms of the GNU General Public License as published by
12			the Free Software Foundation; either version 2 of the License, or
13			(at your option) any later version.
14
15			This program is distributed in the hope that it will be useful,
16			but WITHOUT ANY WARRANTY; without even the implied warranty of
17			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18			GNU General Public License for more details.
19
20			You should have received a copy of the GNU General Public License
21			along with this program; if not, write to the Free Software
22			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23			*/
24
25	ossman_	1069	#include <stdio.h>
26			#include <stdarg.h>
27
28	ossman_	1071	#include <windows.h>
29			#include <winuser.h>
30	ossman_	1069
31	ossman_	1073	#include "../vchannel.h"
32	ossman_	1071
33	ossman_	1069	#define DLL_EXPORT __declspec(dllexport)
34
35	ossman_	1145	#ifdef __GNUC__
36			#define SHARED __attribute__((section ("SHAREDDATA"), shared))
37			#else
38			#define SHARED
39			#endif
40
41	ossman_	1069	// Shared DATA
42			#pragma data_seg ( "SHAREDDATA" )
43
44			// this is the total number of processes this dll is currently attached to
45	ossman_	1145	int g_instance_count SHARED = 0;
46	ossman_	1069
47	ossman_	1145	// blocks for locally generated events
48			RECT g_block_move SHARED = { 0, 0, 0, 0 };
49
50	ossman_	1069	#pragma data_seg ()
51
52			#pragma comment(linker, "/section:SHAREDDATA,rws")
53
54	ossman_	1071	static HHOOK g_cbt_hook = NULL;
55			static HHOOK g_wndproc_hook = NULL;
56	ossman_	1134	static HHOOK g_wndprocret_hook = NULL;
57	ossman_	1069
58	ossman_	1071	static HINSTANCE g_instance = NULL;
59	ossman_	1069
60	ossman_	1071	static HANDLE g_mutex = NULL;
61	ossman_	1069
62	ossman_	1081	static void
63			update_position(HWND hwnd)
64			{
65	ossman_	1145	RECT rect, blocked;
66	ossman_	1081
67			if (!GetWindowRect(hwnd, &rect))
68			{
69			debug("GetWindowRect failed!\n");
70			return;
71			}
72
73	ossman_	1145	WaitForSingleObject(g_mutex, INFINITE);
74			memcpy(&blocked, &g_block_move, sizeof(RECT));
75			ReleaseMutex(g_mutex);
76
77			if ((rect.left == blocked.left) && (rect.top == blocked.top)
78			&& (rect.right == blocked.right) && (rect.bottom == blocked.bottom))
79			return;
80
81	astrand	1091	vchannel_write("POSITION,0x%p,%d,%d,%d,%d,0x%x",
82	ossman_	1081	hwnd,
83			rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, 0);
84			}
85
86	ossman_	1071	static LRESULT CALLBACK
87			wndproc_hook_proc(int code, WPARAM cur_thread, LPARAM details)
88	ossman_	1069	{
89	ossman_	1097	HWND hwnd, parent;
90	ossman_	1079	UINT msg;
91			WPARAM wparam;
92			LPARAM lparam;
93	ossman_	1069
94	ossman_	1079	LONG style;
95	ossman_	1069
96	ossman_	1071	if (code < 0)
97			goto end;
98	ossman_	1069
99	ossman_	1079	hwnd = ((CWPSTRUCT *) details)->hwnd;
100			msg = ((CWPSTRUCT *) details)->message;
101			wparam = ((CWPSTRUCT *) details)->wParam;
102			lparam = ((CWPSTRUCT *) details)->lParam;
103
104			style = GetWindowLong(hwnd, GWL_STYLE);
105
106	ossman_	1082	/* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
107			but they exist nonetheless. */
108			if ((style & WS_CHILD) && !(style & WS_POPUP))
109	ossman_	1079	goto end;
110
111	ossman_	1097	if (style & WS_POPUP)
112	ossman_	1109	{
113	ossman_	1097	parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);
114	ossman_	1109	if (!parent)
115			parent = (HWND) - 1;
116			}
117	ossman_	1097	else
118			parent = NULL;
119
120	ossman_	1071	switch (msg)
121			{
122	ossman_	1069
123	ossman_	1071	case WM_WINDOWPOSCHANGED:
124	ossman_	1079	{
125			WINDOWPOS wp = (WINDOWPOS ) lparam;
126	ossman_	1069
127	ossman_	1079	if (wp->flags & SWP_SHOWWINDOW)
128			{
129	ossman_	1134	unsigned short title[150];
130	ossman_	1099	int state;
131
132	ossman_	1097	vchannel_write("CREATE,0x%p,0x%p,0x%x", hwnd, parent, 0);
133	ossman_	1069
134	ossman_	1134	GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));
135	ossman_	1069
136	ossman_	1113	vchannel_write("TITLE,0x%x,%s,0x%x", hwnd,
137	ossman_	1134	vchannel_strfilter_unicode(title), 0);
138	ossman_	1099
139			if (style & WS_MAXIMIZE)
140			state = 2;
141			else if (style & WS_MINIMIZE)
142			state = 1;
143			else
144			state = 0;
145
146	ossman_	1081	update_position(hwnd);
147	ossman_	1099
148	ossman_	1131	vchannel_write("STATE,0x%p,0x%x,0x%x", hwnd, state, 0);
149	ossman_	1079	}
150	ossman_	1069
151	ossman_	1079	if (wp->flags & SWP_HIDEWINDOW)
152	astrand	1091	vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);
153	ossman_	1079
154	ossman_	1108	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
155	ossman_	1079	break;
156
157	ossman_	1080	if (!(wp->flags & SWP_NOMOVE && wp->flags & SWP_NOSIZE))
158	ossman_	1081	update_position(hwnd);
159	ossman_	1079
160			if (!(wp->flags & SWP_NOZORDER))
161	ossman_	1080	{
162	astrand	1091	vchannel_write("ZCHANGE,0x%p,0x%p,0x%x",
163	ossman_	1079	hwnd,
164			wp->flags & SWP_NOACTIVATE ? wp->
165			hwndInsertAfter : 0, 0);
166	ossman_	1080	}
167	ossman_	1069
168	ossman_	1071	break;
169	ossman_	1079	}
170	ossman_	1069
171	ossman_	1081	case WM_SIZE:
172	ossman_	1108	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
173	ossman_	1083	break;
174	ossman_	1081	update_position(hwnd);
175			break;
176
177			case WM_MOVE:
178	ossman_	1108	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
179	ossman_	1083	break;
180	ossman_	1081	update_position(hwnd);
181			break;
182
183	ossman_	1134	case WM_DESTROY:
184			if (!(style & WS_VISIBLE))
185			break;
186			vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);
187			break;
188
189			default:
190			break;
191			}
192
193			end:
194			return CallNextHookEx(g_wndproc_hook, code, cur_thread, details);
195			}
196
197			static LRESULT CALLBACK
198			wndprocret_hook_proc(int code, WPARAM cur_thread, LPARAM details)
199			{
200			HWND hwnd, parent;
201			UINT msg;
202			WPARAM wparam;
203			LPARAM lparam;
204
205			LONG style;
206
207			if (code < 0)
208			goto end;
209
210			hwnd = ((CWPRETSTRUCT *) details)->hwnd;
211			msg = ((CWPRETSTRUCT *) details)->message;
212			wparam = ((CWPRETSTRUCT *) details)->wParam;
213			lparam = ((CWPRETSTRUCT *) details)->lParam;
214
215			style = GetWindowLong(hwnd, GWL_STYLE);
216
217			/* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
218			but they exist nonetheless. */
219			if ((style & WS_CHILD) && !(style & WS_POPUP))
220			goto end;
221
222			switch (msg)
223			{
224	ossman_	1102	case WM_SETTEXT:
225	ossman_	1113	{
226	ossman_	1134	unsigned short title[150];
227	ossman_	1113	if (!(style & WS_VISIBLE))
228			break;
229	ossman_	1134	/* We cannot use the string in lparam because
230			we need unicode. */
231			GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));
232	ossman_	1113	vchannel_write("TITLE,0x%p,%s,0x%x", hwnd,
233	ossman_	1134	vchannel_strfilter_unicode(title), 0);
234	ossman_	1102	break;
235	ossman_	1113	}
236	ossman_	1102
237	ossman_	1071	default:
238			break;
239			}
240
241			end:
242	ossman_	1134	return CallNextHookEx(g_wndprocret_hook, code, cur_thread, details);
243	ossman_	1069	}
244
245	ossman_	1071	static LRESULT CALLBACK
246			cbt_hook_proc(int code, WPARAM wparam, LPARAM lparam)
247	ossman_	1069	{
248	ossman_	1071	if (code < 0)
249			goto end;
250	ossman_	1069
251	ossman_	1071	switch (code)
252			{
253			case HCBT_MINMAX:
254			{
255	ossman_	1079	int show, state;
256	ossman_	1069
257	ossman_	1071	show = LOWORD(lparam);
258	ossman_	1069
259	ossman_	1128	if ((show == SW_NORMAL) \|\| (show == SW_SHOWNORMAL)
260			\|\| (show == SW_RESTORE))
261	ossman_	1079	state = 0;
262	ossman_	1106	else if ((show == SW_MINIMIZE) \|\| (show == SW_SHOWMINIMIZED))
263	ossman_	1079	state = 1;
264	ossman_	1106	else if ((show == SW_MAXIMIZE) \|\| (show == SW_SHOWMAXIMIZED))
265	ossman_	1079	state = 2;
266	ossman_	1100	else
267	ossman_	1106	{
268			debug("Unexpected show: %d", show);
269	ossman_	1100	break;
270	ossman_	1106	}
271	ossman_	1096	vchannel_write("STATE,0x%p,0x%x,0x%x", (HWND) wparam, state, 0);
272	ossman_	1071	break;
273			}
274	ossman_	1069
275	ossman_	1071	default:
276			break;
277			}
278	ossman_	1069
279	ossman_	1071	end:
280			return CallNextHookEx(g_cbt_hook, code, wparam, lparam);
281	ossman_	1069	}
282
283	ossman_	1071	DLL_EXPORT void
284			SetHooks(void)
285	ossman_	1069	{
286	ossman_	1071	if (!g_cbt_hook)
287			g_cbt_hook = SetWindowsHookEx(WH_CBT, cbt_hook_proc, g_instance, 0);
288	ossman_	1069
289	ossman_	1071	if (!g_wndproc_hook)
290			g_wndproc_hook = SetWindowsHookEx(WH_CALLWNDPROC, wndproc_hook_proc, g_instance, 0);
291	ossman_	1134
292			if (!g_wndprocret_hook)
293			g_wndprocret_hook =
294			SetWindowsHookEx(WH_CALLWNDPROCRET, wndprocret_hook_proc, g_instance, 0);
295	ossman_	1069	}
296
297	ossman_	1071	DLL_EXPORT void
298			RemoveHooks(void)
299	ossman_	1069	{
300	ossman_	1071	if (g_cbt_hook)
301			UnhookWindowsHookEx(g_cbt_hook);
302	ossman_	1069
303	ossman_	1071	if (g_wndproc_hook)
304			UnhookWindowsHookEx(g_wndproc_hook);
305	ossman_	1134
306			if (g_wndprocret_hook)
307			UnhookWindowsHookEx(g_wndprocret_hook);
308	ossman_	1069	}
309
310	ossman_	1145	DLL_EXPORT void
311			SafeMoveWindow(HWND hwnd, int x, int y, int width, int height)
312			{
313			WaitForSingleObject(g_mutex, INFINITE);
314			g_block_move.left = x;
315			g_block_move.top = y;
316			g_block_move.right = x + width;
317			g_block_move.bottom = y + height;
318			ReleaseMutex(g_mutex);
319
320			SetWindowPos(hwnd, NULL, x, y, width, height, SWP_NOACTIVATE \| SWP_NOZORDER);
321
322			WaitForSingleObject(g_mutex, INFINITE);
323			memset(&g_block_move, 0, sizeof(RECT));
324			ReleaseMutex(g_mutex);
325			}
326
327	ossman_	1071	DLL_EXPORT int
328			GetInstanceCount()
329	ossman_	1069	{
330	ossman_	1071	return g_instance_count;
331	ossman_	1069	}
332
333	ossman_	1071	BOOL APIENTRY
334			DllMain(HINSTANCE hinstDLL, DWORD ul_reason_for_call, LPVOID lpReserved)
335	ossman_	1069	{
336	ossman_	1071	switch (ul_reason_for_call)
337			{
338			case DLL_PROCESS_ATTACH:
339			// remember our instance handle
340			g_instance = hinstDLL;
341	ossman_	1069
342	ossman_	1073	g_mutex = CreateMutex(NULL, FALSE, "Local\\SeamlessDLL");
343	ossman_	1071	if (!g_mutex)
344			return FALSE;
345	ossman_	1069
346	ossman_	1071	WaitForSingleObject(g_mutex, INFINITE);
347			++g_instance_count;
348			ReleaseMutex(g_mutex);
349	ossman_	1069
350	ossman_	1071	vchannel_open();
351	ossman_	1069
352	ossman_	1071	break;
353	ossman_	1069
354	ossman_	1071	case DLL_THREAD_ATTACH:
355			break;
356	ossman_	1069
357	ossman_	1071	case DLL_THREAD_DETACH:
358			break;
359	ossman_	1069
360	ossman_	1071	case DLL_PROCESS_DETACH:
361			WaitForSingleObject(g_mutex, INFINITE);
362			--g_instance_count;
363			ReleaseMutex(g_mutex);
364	ossman_	1069
365	ossman_	1071	vchannel_close();
366	ossman_	1069
367	ossman_	1071	CloseHandle(g_mutex);
368	ossman_	1069
369	ossman_	1071	break;
370			}
371	ossman_	1069
372	ossman_	1071	return TRUE;
373	ossman_	1069	}