| 1 | /* |
| 2 | * Copyright (C) Jon TURNEY 2011 |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 5 | * copy of this software and associated documentation files (the "Software"), |
| 6 | * to deal in the Software without restriction, including without limitation |
| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
| 9 | * Software is furnished to do so, subject to the following conditions: |
| 10 | * |
| 11 | * The above copyright notice and this permission notice (including the next |
| 12 | * paragraph) shall be included in all copies or substantial portions of the |
| 13 | * Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| 21 | * DEALINGS IN THE SOFTWARE. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #include "win.h" |
| 26 | |
| 27 | /* |
| 28 | * This is the messaging window, a hidden top-level window. We never do anything |
| 29 | * with it, but other programs may send messages to it. |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | * winMsgWindowProc - Window procedure for msg window |
| 34 | */ |
| 35 | |
| 36 | static |
| 37 | LRESULT CALLBACK |
| 38 | winMsgWindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) |
| 39 | { |
| 40 | #if CYGDEBUG |
| 41 | winDebugWin32Message("winMsgWindowProc", hwnd, message, wParam, lParam); |
| 42 | #endif |
| 43 | |
| 44 | switch (message) { |
| 45 | case WM_ENDSESSION: |
| 46 | if (!wParam) |
| 47 | return 0; /* shutdown is being cancelled */ |
| 48 | |
| 49 | /* |
| 50 | Send a WM_GIVEUP message to the X server thread so it wakes up if |
| 51 | blocked in select(), performs GiveUp(), and then notices that GiveUp() |
| 52 | has set the DE_TERMINATE flag so exits the msg dispatch loop. |
| 53 | */ |
| 54 | { |
| 55 | ScreenPtr pScreen = screenInfo.screens[0]; |
| 56 | |
| 57 | winScreenPriv(pScreen); |
| 58 | PostMessage(pScreenPriv->hwndScreen, WM_GIVEUP, 0, 0); |
| 59 | } |
| 60 | |
| 61 | /* |
| 62 | This process will be terminated by the system almost immediately |
| 63 | after the last thread with a message queue returns from processing |
| 64 | WM_ENDSESSION, so we cannot rely on any code executing after this |
| 65 | message is processed and need to wait here until ddxGiveUp() is called |
| 66 | and releases the termination mutex to guarantee that the lock file and |
| 67 | unix domain sockets have been removed |
| 68 | |
| 69 | ofc, Microsoft doesn't document this under WM_ENDSESSION, you are supposed |
| 70 | to read the source of CRSS to find out how it works :-) |
| 71 | |
| 72 | http://blogs.msdn.com/b/michen/archive/2008/04/04/application-termination-when-user-logs-off.aspx |
| 73 | */ |
| 74 | { |
| 75 | int iReturn = pthread_mutex_lock(&g_pmTerminating); |
| 76 | |
| 77 | if (iReturn != 0) { |
| 78 | ErrorF("winMsgWindowProc - pthread_mutex_lock () failed: %d\n", |
| 79 | iReturn); |
| 80 | } |
| 81 | winDebug |
| 82 | ("winMsgWindowProc - WM_ENDSESSION termination lock acquired\n"); |
| 83 | } |
| 84 | |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | return DefWindowProc(hwnd, message, wParam, lParam); |
| 89 | } |
| 90 | |
| 91 | static HWND |
| 92 | winCreateMsgWindow(void) |
| 93 | { |
| 94 | HWND hwndMsg; |
| 95 | wATOM winClass; |
| 96 | |
| 97 | // register window class |
| 98 | { |
| 99 | WNDCLASSEX wcx; |
| 100 | |
| 101 | wcx.cbSize = sizeof(WNDCLASSEX); |
| 102 | wcx.style = CS_HREDRAW | CS_VREDRAW; |
| 103 | wcx.lpfnWndProc = winMsgWindowProc; |
| 104 | wcx.cbClsExtra = 0; |
| 105 | wcx.cbWndExtra = 0; |
| 106 | wcx.hInstance = g_hInstance; |
| 107 | wcx.hIcon = NULL; |
| 108 | wcx.hCursor = 0; |
| 109 | wcx.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH); |
| 110 | wcx.lpszMenuName = NULL; |
| 111 | wcx.lpszClassName = WINDOW_CLASS_X_MSG; |
| 112 | wcx.hIconSm = NULL; |
| 113 | winClass = RegisterClassEx(&wcx); |
| 114 | } |
| 115 | |
| 116 | // Create the msg window. |
| 117 | hwndMsg = CreateWindowEx(0, // no extended styles |
| 118 | WINDOW_CLASS_X_MSG, // class name |
| 119 | "XWin Msg Window", // window name |
| 120 | WS_OVERLAPPEDWINDOW, // overlapped window |
| 121 | CW_USEDEFAULT, // default horizontal position |
| 122 | CW_USEDEFAULT, // default vertical position |
| 123 | CW_USEDEFAULT, // default width |
| 124 | CW_USEDEFAULT, // default height |
| 125 | (HWND) NULL, // no parent or owner window |
| 126 | (HMENU) NULL, // class menu used |
| 127 | GetModuleHandle(NULL), // instance handle |
| 128 | NULL); // no window creation data |
| 129 | |
| 130 | if (!hwndMsg) { |
| 131 | ErrorF("winCreateMsgWindow - Create msg window failed\n"); |
| 132 | return NULL; |
| 133 | } |
| 134 | |
| 135 | winDebug("winCreateMsgWindow - Created msg window hwnd 0x%x\n", hwndMsg); |
| 136 | |
| 137 | return hwndMsg; |
| 138 | } |
| 139 | |
| 140 | static void * |
| 141 | winMsgWindowThreadProc(void *arg) |
| 142 | { |
| 143 | HWND hwndMsg; |
| 144 | |
| 145 | winDebug("winMsgWindowThreadProc - Hello\n"); |
| 146 | |
| 147 | hwndMsg = winCreateMsgWindow(); |
| 148 | if (hwndMsg) { |
| 149 | MSG msg; |
| 150 | |
| 151 | /* Pump the msg window message queue */ |
| 152 | while (GetMessage(&msg, hwndMsg, 0, 0) > 0) { |
| 153 | #if CYGDEBUG |
| 154 | winDebugWin32Message("winMsgWindowThread", msg.hwnd, msg.message, |
| 155 | msg.wParam, msg.lParam); |
| 156 | #endif |
| 157 | DispatchMessage(&msg); |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | winDebug("winMsgWindowThreadProc - Exit\n"); |
| 162 | |
| 163 | return NULL; |
| 164 | } |
| 165 | |
| 166 | Bool |
| 167 | winCreateMsgWindowThread(void) |
| 168 | { |
| 169 | pthread_t ptMsgWindowThreadProc; |
| 170 | |
| 171 | /* Spawn a thread for the msg window */ |
| 172 | if (pthread_create(&ptMsgWindowThreadProc, |
| 173 | NULL, winMsgWindowThreadProc, NULL)) { |
| 174 | /* Bail if thread creation failed */ |
| 175 | ErrorF("winCreateMsgWindow - pthread_create failed.\n"); |
| 176 | return FALSE; |
| 177 | } |
| 178 | |
| 179 | return TRUE; |
| 180 | } |