components/browser_watcher/watcher_client_win.cc

   1 // Copyright (c) 2014 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 "components/browser_watcher/watcher_client_win.h"
   6
   7 #include <windows.h>
   8
   9 #include "base/command_line.h"
  10 #include "base/logging.h"
  11 #include "base/process/launch.h"
  12 #include "base/win/windows_version.h"
  13
  14 namespace browser_watcher {
  15
  16 namespace {
  17
  18 base::Process OpenOwnProcessInheritable() {
  19   return base::Process(
  20       ::OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
  21                     TRUE,  // Ineritable handle.
  22                     base::GetCurrentProcId()));
  23 }
  24
  25 }  // namespace
  26
  27 WatcherClient::WatcherClient(const CommandLineGenerator& command_line_generator)
  28     : use_legacy_launch_(base::win::GetVersion() < base::win::VERSION_VISTA),
  29       command_line_generator_(command_line_generator),
  30       process_(base::kNullProcessHandle) {
  31 }
  32
  33 void WatcherClient::LaunchWatcher() {
  34   DCHECK(!process_.IsValid());
  35
  36   // Build the command line for the watcher process.
  37   base::Process self = OpenOwnProcessInheritable();
  38   DCHECK(self.IsValid());
  39   base::CommandLine cmd_line(command_line_generator_.Run(self.Handle()));
  40
  41   base::HandlesToInheritVector to_inherit;
  42   base::LaunchOptions options;
  43   options.start_hidden = true;
  44   if (use_legacy_launch_) {
  45     // Launch the child process inheriting all handles on XP.
  46     options.inherit_handles = true;
  47   } else {
  48     // Launch the child process inheriting only |self| on
  49     // Vista and better.
  50     to_inherit.push_back(self.Handle());
  51     to_inherit.insert(to_inherit.end(), inherited_handles_.begin(),
  52                       inherited_handles_.end());
  53     options.handles_to_inherit = &to_inherit;
  54   }
  55
  56   process_ = base::LaunchProcess(cmd_line, options);
  57   if (!process_.IsValid())
  58     LOG(ERROR) << "Failed to launch browser watcher.";
  59 }
  60
  61 void WatcherClient::AddInheritedHandle(HANDLE handle) {
  62   inherited_handles_.push_back(handle);
  63 }
  64
  65 }  // namespace browser_watcher