Add Windows shutdown handler

GitHub-Pull: bitcoin#13131
Rebased-From: ddebde7

src/init.cpp

@@ -283,6 +283,7 @@ void Shutdown()
  * The execution context the handler is invoked in is not guaranteed,
  * so we restrict handler operations to just touching variables:
  */
+#ifndef WIN32
 static void HandleSIGTERM(int)
 {
     fRequestShutdown = true;
@@ -292,6 +293,14 @@ static void HandleSIGHUP(int)
 {
     fReopenDebugLog = true;
 }
+#else
+static BOOL WINAPI consoleCtrlHandler(DWORD dwCtrlType)
+{
+    fRequestShutdown = true;
+    Sleep(INFINITE);
+    return true;
+}
+#endif
 
 #ifndef WIN32
 static void registerSignalHandler(int signal, void(*handler)(int))
@@ -880,6 +889,8 @@ bool AppInitBasicSetup()
 
     // Ignore SIGPIPE, otherwise it will bring the daemon down if the client closes unexpectedly
     signal(SIGPIPE, SIG_IGN);
+#else
+    SetConsoleCtrlHandler(consoleCtrlHandler, true);
 #endif
 
     std::set_new_handler(new_handler_terminate);