device/bluetooth/bluetooth_init_win.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "device/bluetooth/bluetooth_init_win.h"
   6
   7 #include "base/threading/thread_restrictions.h"
   8
   9 namespace {
  10
  11 // A frame-based exception handler filter function for a handler for exceptions
  12 // generated by the Visual C++ delay loader helper function.
  13 int FilterVisualCPPExceptions(DWORD exception_code) {
  14   return HRESULT_FACILITY(exception_code) == FACILITY_VISUALCPP ?
  15       EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH;
  16 }
  17
  18 }  // namespace
  19
  20 namespace device {
  21 namespace bluetooth_init_win {
  22
  23 bool HasBluetoothStack() {
  24   static enum {
  25     HBS_UNKNOWN,
  26     HBS_YES,
  27     HBS_NO,
  28   } has_bluetooth_stack = HBS_UNKNOWN;
  29
  30   if (has_bluetooth_stack == HBS_UNKNOWN) {
  31     base::ThreadRestrictions::AssertIOAllowed();
  32     HRESULT hr = E_FAIL;
  33     __try {
  34       hr = __HrLoadAllImportsForDll("bthprops.cpl");
  35     } __except(FilterVisualCPPExceptions(::GetExceptionCode())) {
  36       hr = E_FAIL;
  37     }
  38     has_bluetooth_stack = SUCCEEDED(hr) ? HBS_YES : HBS_NO;
  39   }
  40
  41   return has_bluetooth_stack == HBS_YES;
  42 }
  43
  44 }  // namespace bluetooth_init_win
  45 }  // namespace device