chrome/app/chrome_exe_main_win.cc

   1 // Copyright (c) 2011 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 <windows.h>
   6 #include <tchar.h>
   7
   8 #include <string>
   9
  10 #include "base/at_exit.h"
  11 #include "base/command_line.h"
  12 #include "base/files/file_path.h"
  13 #include "chrome/app/client_util.h"
  14 #include "chrome/browser/chrome_process_finder_win.h"
  15 #include "chrome/browser/policy/policy_path_parser.h"
  16 #include "chrome/common/chrome_constants.h"
  17 #include "chrome/common/chrome_paths_internal.h"
  18 #include "chrome/common/chrome_switches.h"
  19 #include "chrome_elf/chrome_elf_main.h"
  20 #include "components/startup_metric_utils/startup_metric_utils.h"
  21 #include "content/public/common/result_codes.h"
  22 #include "ui/gfx/win/dpi.h"
  23
  24 namespace {
  25
  26 void CheckSafeModeLaunch() {
  27   unsigned short k1 = ::GetAsyncKeyState(VK_CONTROL);
  28   unsigned short k2 = ::GetAsyncKeyState(VK_MENU);
  29   const unsigned short kPressedMask = 0x8000;
  30   if ((k1 & kPressedMask) && (k2 & kPressedMask))
  31     ::SetEnvironmentVariableA(chrome::kSafeModeEnvVar, "1");
  32 }
  33
  34 // List of switches that it's safe to rendezvous early with. Fast start should
  35 // not be done if a command line contains a switch not in this set.
  36 // Note this is currently stored as a list of two because it's probably faster
  37 // to iterate over this small array than building a map for constant time
  38 // lookups.
  39 const char* const kFastStartSwitches[] = {
  40   switches::kProfileDirectory,
  41   switches::kShowAppList,
  42 };
  43
  44 bool IsFastStartSwitch(const std::string& command_line_switch) {
  45   for (size_t i = 0; i < arraysize(kFastStartSwitches); ++i) {
  46     if (command_line_switch == kFastStartSwitches[i])
  47       return true;
  48   }
  49   return false;
  50 }
  51
  52 bool ContainsNonFastStartFlag(const CommandLine& command_line) {
  53   const CommandLine::SwitchMap& switches = command_line.GetSwitches();
  54   if (switches.size() > arraysize(kFastStartSwitches))
  55     return true;
  56   for (CommandLine::SwitchMap::const_iterator it = switches.begin();
  57        it != switches.end(); ++it) {
  58     if (!IsFastStartSwitch(it->first))
  59       return true;
  60   }
  61   return false;
  62 }
  63
  64 bool AttemptFastNotify(const CommandLine& command_line) {
  65   if (ContainsNonFastStartFlag(command_line))
  66     return false;
  67
  68   base::FilePath user_data_dir;
  69   if (!chrome::GetDefaultUserDataDirectory(&user_data_dir))
  70     return false;
  71   policy::path_parser::CheckUserDataDirPolicy(&user_data_dir);
  72
  73   HWND chrome = chrome::FindRunningChromeWindow(user_data_dir);
  74   if (!chrome)
  75     return false;
  76   return chrome::AttemptToNotifyRunningChrome(chrome, true) ==
  77       chrome::NOTIFY_SUCCESS;
  78 }
  79
  80 }  // namespace
  81
  82 int APIENTRY wWinMain(HINSTANCE instance, HINSTANCE prev, wchar_t*, int) {
  83   startup_metric_utils::RecordExeMainEntryTime();
  84
  85   // Signal Chrome Elf that Chrome has begun to start.
  86   SignalChromeElf();
  87
  88   // Initialize the commandline singleton from the environment.
  89   CommandLine::Init(0, NULL);
  90   // The exit manager is in charge of calling the dtors of singletons.
  91   base::AtExitManager exit_manager;
  92
  93   gfx::EnableHighDPISupport();
  94
  95   if (AttemptFastNotify(*CommandLine::ForCurrentProcess()))
  96     return 0;
  97
  98   CheckSafeModeLaunch();
  99
 100   // Load and launch the chrome dll. *Everything* happens inside.
 101   MainDllLoader* loader = MakeMainDllLoader();
 102   int rc = loader->Launch(instance);
 103   loader->RelaunchChromeBrowserWithNewCommandLineIfNeeded();
 104   delete loader;
 105   return rc;
 106 }