Dash Core Source Documentation (0.16.0.1)

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winshutdownmonitor.cpp
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1 // Copyright (c) 2014 The Bitcoin Core developers
2 // Distributed under the MIT software license, see the accompanying
3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 
6 
7 #if defined(Q_OS_WIN) && QT_VERSION >= 0x050000
8 #include <init.h>
9 #include <util.h>
10 
11 #include <windows.h>
12 
13 #include <QDebug>
14 
15 #include <openssl/rand.h>
16 
17 // If we don't want a message to be processed by Qt, return true and set result to
18 // the value that the window procedure should return. Otherwise return false.
19 bool WinShutdownMonitor::nativeEventFilter(const QByteArray &eventType, void *pMessage, long *pnResult)
20 {
21  Q_UNUSED(eventType);
22 
23  MSG *pMsg = static_cast<MSG *>(pMessage);
24 
25  // Seed OpenSSL PRNG with Windows event data (e.g. mouse movements and other user interactions)
26  if (RAND_event(pMsg->message, pMsg->wParam, pMsg->lParam) == 0) {
27  // Warn only once as this is performance-critical
28  static bool warned = false;
29  if (!warned) {
30  LogPrintf("%s: OpenSSL RAND_event() failed to seed OpenSSL PRNG with enough data.\n", __func__);
31  warned = true;
32  }
33  }
34 
35  switch(pMsg->message)
36  {
37  case WM_QUERYENDSESSION:
38  {
39  // Initiate a client shutdown after receiving a WM_QUERYENDSESSION and block
40  // Windows session end until we have finished client shutdown.
41  StartShutdown();
42  *pnResult = FALSE;
43  return true;
44  }
45 
46  case WM_ENDSESSION:
47  {
48  *pnResult = FALSE;
49  return true;
50  }
51  }
52 
53  return false;
54 }
55 
56 void WinShutdownMonitor::registerShutdownBlockReason(const QString& strReason, const HWND& mainWinId)
57 {
58  typedef BOOL (WINAPI *PSHUTDOWNBRCREATE)(HWND, LPCWSTR);
59  PSHUTDOWNBRCREATE shutdownBRCreate = (PSHUTDOWNBRCREATE)GetProcAddress(GetModuleHandleA("User32.dll"), "ShutdownBlockReasonCreate");
60  if (shutdownBRCreate == nullptr) {
61  qWarning() << "registerShutdownBlockReason: GetProcAddress for ShutdownBlockReasonCreate failed";
62  return;
63  }
64 
65  if (shutdownBRCreate(mainWinId, strReason.toStdWString().c_str()))
66  qWarning() << "registerShutdownBlockReason: Successfully registered: " + strReason;
67  else
68  qWarning() << "registerShutdownBlockReason: Failed to register: " + strReason;
69 }
70 #endif
void StartShutdown()
Definition: init.cpp:171
#define LogPrintf(...)
Definition: util.h:203
Released under the MIT license