content/browser/browser_child_process_host_impl.cc

   1 // Copyright (c) 2012 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 "content/browser/browser_child_process_host_impl.h"
   6
   7 #include "base/base_switches.h"
   8 #include "base/bind.h"
   9 #include "base/command_line.h"
  10 #include "base/files/file_path.h"
  11 #include "base/lazy_instance.h"
  12 #include "base/logging.h"
  13 #include "base/metrics/histogram.h"
  14 #include "base/path_service.h"
  15 #include "base/stl_util.h"
  16 #include "base/strings/string_util.h"
  17 #include "base/synchronization/waitable_event.h"
  18 #include "content/browser/histogram_message_filter.h"
  19 #include "content/browser/loader/resource_message_filter.h"
  20 #include "content/browser/profiler_message_filter.h"
  21 #include "content/browser/tracing/trace_message_filter.h"
  22 #include "content/common/child_process_host_impl.h"
  23 #include "content/public/browser/browser_child_process_host_delegate.h"
  24 #include "content/public/browser/browser_child_process_observer.h"
  25 #include "content/public/browser/browser_thread.h"
  26 #include "content/public/browser/child_process_data.h"
  27 #include "content/public/browser/content_browser_client.h"
  28 #include "content/public/common/content_switches.h"
  29 #include "content/public/common/process_type.h"
  30 #include "content/public/common/result_codes.h"
  31
  32 #if defined(OS_MACOSX)
  33 #include "content/browser/mach_broker_mac.h"
  34 #endif
  35
  36 namespace content {
  37 namespace {
  38
  39 static base::LazyInstance<BrowserChildProcessHostImpl::BrowserChildProcessList>
  40     g_child_process_list = LAZY_INSTANCE_INITIALIZER;
  41
  42 base::LazyInstance<ObserverList<BrowserChildProcessObserver> >
  43     g_observers = LAZY_INSTANCE_INITIALIZER;
  44
  45 void NotifyProcessHostConnected(const ChildProcessData& data) {
  46   FOR_EACH_OBSERVER(BrowserChildProcessObserver, g_observers.Get(),
  47                     BrowserChildProcessHostConnected(data));
  48 }
  49
  50 void NotifyProcessHostDisconnected(const ChildProcessData& data) {
  51   FOR_EACH_OBSERVER(BrowserChildProcessObserver, g_observers.Get(),
  52                     BrowserChildProcessHostDisconnected(data));
  53 }
  54
  55 void NotifyProcessCrashed(const ChildProcessData& data) {
  56   FOR_EACH_OBSERVER(BrowserChildProcessObserver, g_observers.Get(),
  57                     BrowserChildProcessCrashed(data));
  58 }
  59
  60 }  // namespace
  61
  62 BrowserChildProcessHost* BrowserChildProcessHost::Create(
  63     int process_type,
  64     BrowserChildProcessHostDelegate* delegate) {
  65   return new BrowserChildProcessHostImpl(process_type, delegate);
  66 }
  67
  68 #if defined(OS_MACOSX)
  69 base::ProcessMetrics::PortProvider* BrowserChildProcessHost::GetPortProvider() {
  70   return MachBroker::GetInstance();
  71 }
  72 #endif
  73
  74 // static
  75 BrowserChildProcessHostImpl::BrowserChildProcessList*
  76     BrowserChildProcessHostImpl::GetIterator() {
  77   return g_child_process_list.Pointer();
  78 }
  79
  80 // static
  81 void BrowserChildProcessHostImpl::AddObserver(
  82     BrowserChildProcessObserver* observer) {
  83   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  84   g_observers.Get().AddObserver(observer);
  85 }
  86
  87 // static
  88 void BrowserChildProcessHostImpl::RemoveObserver(
  89     BrowserChildProcessObserver* observer) {
  90   // TODO(phajdan.jr): Check thread after fixing http://crbug.com/167126.
  91   g_observers.Get().RemoveObserver(observer);
  92 }
  93
  94 BrowserChildProcessHostImpl::BrowserChildProcessHostImpl(
  95     int process_type,
  96     BrowserChildProcessHostDelegate* delegate)
  97     : data_(process_type),
  98       delegate_(delegate),
  99       power_monitor_message_broadcaster_(this) {
 100   data_.id = ChildProcessHostImpl::GenerateChildProcessUniqueId();
 101
 102   child_process_host_.reset(ChildProcessHost::Create(this));
 103   AddFilter(new TraceMessageFilter);
 104   AddFilter(new ProfilerMessageFilter(process_type));
 105   AddFilter(new HistogramMessageFilter);
 106
 107   g_child_process_list.Get().push_back(this);
 108   GetContentClient()->browser()->BrowserChildProcessHostCreated(this);
 109
 110   power_monitor_message_broadcaster_.Init();
 111 }
 112
 113 BrowserChildProcessHostImpl::~BrowserChildProcessHostImpl() {
 114   g_child_process_list.Get().remove(this);
 115
 116 #if defined(OS_WIN)
 117   DeleteProcessWaitableEvent(early_exit_watcher_.GetWatchedEvent());
 118 #endif
 119 }
 120
 121 // static
 122 void BrowserChildProcessHostImpl::TerminateAll() {
 123   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 124   // Make a copy since the BrowserChildProcessHost dtor mutates the original
 125   // list.
 126   BrowserChildProcessList copy = g_child_process_list.Get();
 127   for (BrowserChildProcessList::iterator it = copy.begin();
 128        it != copy.end(); ++it) {
 129     delete (*it)->delegate();  // ~*HostDelegate deletes *HostImpl.
 130   }
 131 }
 132
 133 void BrowserChildProcessHostImpl::Launch(
 134     SandboxedProcessLauncherDelegate* delegate,
 135     base::CommandLine* cmd_line) {
 136   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 137
 138   GetContentClient()->browser()->AppendExtraCommandLineSwitches(
 139       cmd_line, data_.id);
 140
 141   const base::CommandLine& browser_command_line =
 142       *base::CommandLine::ForCurrentProcess();
 143   static const char* kForwardSwitches[] = {
 144     switches::kDisableLogging,
 145     switches::kEnableLogging,
 146     switches::kIPCConnectionTimeout,
 147     switches::kLoggingLevel,
 148     switches::kTraceToConsole,
 149     switches::kV,
 150     switches::kVModule,
 151   };
 152   cmd_line->CopySwitchesFrom(browser_command_line, kForwardSwitches,
 153                              arraysize(kForwardSwitches));
 154
 155   child_process_.reset(new ChildProcessLauncher(
 156       delegate,
 157       cmd_line,
 158       data_.id,
 159       this));
 160 }
 161
 162 const ChildProcessData& BrowserChildProcessHostImpl::GetData() const {
 163   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 164   return data_;
 165 }
 166
 167 ChildProcessHost* BrowserChildProcessHostImpl::GetHost() const {
 168   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 169   return child_process_host_.get();
 170 }
 171
 172 base::ProcessHandle BrowserChildProcessHostImpl::GetHandle() const {
 173   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 174   DCHECK(child_process_.get())
 175       << "Requesting a child process handle before launching.";
 176   DCHECK(child_process_->GetHandle())
 177       << "Requesting a child process handle before launch has completed OK.";
 178   return child_process_->GetHandle();
 179 }
 180
 181 void BrowserChildProcessHostImpl::SetName(const base::string16& name) {
 182   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 183   data_.name = name;
 184 }
 185
 186 void BrowserChildProcessHostImpl::SetHandle(base::ProcessHandle handle) {
 187   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 188   data_.handle = handle;
 189 }
 190
 191 void BrowserChildProcessHostImpl::ForceShutdown() {
 192   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 193   g_child_process_list.Get().remove(this);
 194   child_process_host_->ForceShutdown();
 195 }
 196
 197 void BrowserChildProcessHostImpl::SetBackgrounded(bool backgrounded) {
 198   child_process_->SetProcessBackgrounded(backgrounded);
 199 }
 200
 201 void BrowserChildProcessHostImpl::SetTerminateChildOnShutdown(
 202     bool terminate_on_shutdown) {
 203   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 204   child_process_->SetTerminateChildOnShutdown(terminate_on_shutdown);
 205 }
 206
 207 void BrowserChildProcessHostImpl::AddFilter(BrowserMessageFilter* filter) {
 208   child_process_host_->AddFilter(filter->GetFilter());
 209 }
 210
 211 void BrowserChildProcessHostImpl::NotifyProcessInstanceCreated(
 212     const ChildProcessData& data) {
 213   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 214   FOR_EACH_OBSERVER(BrowserChildProcessObserver, g_observers.Get(),
 215                     BrowserChildProcessInstanceCreated(data));
 216 }
 217
 218 void BrowserChildProcessHostImpl::HistogramBadMessageTerminated(
 219     int process_type) {
 220   UMA_HISTOGRAM_ENUMERATION("ChildProcess.BadMessgeTerminated", process_type,
 221                             PROCESS_TYPE_MAX);
 222 }
 223
 224 base::TerminationStatus BrowserChildProcessHostImpl::GetTerminationStatus(
 225     bool known_dead, int* exit_code) {
 226   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 227   if (!child_process_)  // If the delegate doesn't use Launch() helper.
 228     return base::GetTerminationStatus(data_.handle, exit_code);
 229   return child_process_->GetChildTerminationStatus(known_dead,
 230                                                    exit_code);
 231 }
 232
 233 bool BrowserChildProcessHostImpl::OnMessageReceived(
 234     const IPC::Message& message) {
 235   return delegate_->OnMessageReceived(message);
 236 }
 237
 238 void BrowserChildProcessHostImpl::OnChannelConnected(int32 peer_pid) {
 239 #if defined(OS_WIN)
 240   // From this point onward, the exit of the child process is detected by an
 241   // error on the IPC channel.
 242   DeleteProcessWaitableEvent(early_exit_watcher_.GetWatchedEvent());
 243   early_exit_watcher_.StopWatching();
 244 #endif
 245
 246   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 247   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
 248                           base::Bind(&NotifyProcessHostConnected, data_));
 249
 250   delegate_->OnChannelConnected(peer_pid);
 251 }
 252
 253 void BrowserChildProcessHostImpl::OnChannelError() {
 254   delegate_->OnChannelError();
 255 }
 256
 257 void BrowserChildProcessHostImpl::OnBadMessageReceived(
 258     const IPC::Message& message) {
 259   HistogramBadMessageTerminated(data_.process_type);
 260   if (CommandLine::ForCurrentProcess()->HasSwitch(
 261           switches::kDisableKillAfterBadIPC)) {
 262     return;
 263   }
 264   base::KillProcess(GetHandle(), RESULT_CODE_KILLED_BAD_MESSAGE, false);
 265 }
 266
 267 bool BrowserChildProcessHostImpl::CanShutdown() {
 268   return delegate_->CanShutdown();
 269 }
 270
 271 void BrowserChildProcessHostImpl::OnChildDisconnected() {
 272   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 273   if (child_process_.get() || data_.handle) {
 274     DCHECK(data_.handle != base::kNullProcessHandle);
 275     int exit_code;
 276     base::TerminationStatus status = GetTerminationStatus(
 277         true /* known_dead */, &exit_code);
 278     switch (status) {
 279       case base::TERMINATION_STATUS_PROCESS_CRASHED:
 280       case base::TERMINATION_STATUS_ABNORMAL_TERMINATION: {
 281         delegate_->OnProcessCrashed(exit_code);
 282         BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
 283                                 base::Bind(&NotifyProcessCrashed, data_));
 284         UMA_HISTOGRAM_ENUMERATION("ChildProcess.Crashed2",
 285                                   data_.process_type,
 286                                   PROCESS_TYPE_MAX);
 287         break;
 288       }
 289       case base::TERMINATION_STATUS_PROCESS_WAS_KILLED: {
 290         delegate_->OnProcessCrashed(exit_code);
 291         // Report that this child process was killed.
 292         UMA_HISTOGRAM_ENUMERATION("ChildProcess.Killed2",
 293                                   data_.process_type,
 294                                   PROCESS_TYPE_MAX);
 295         break;
 296       }
 297       case base::TERMINATION_STATUS_STILL_RUNNING: {
 298         UMA_HISTOGRAM_ENUMERATION("ChildProcess.DisconnectedAlive2",
 299                                   data_.process_type,
 300                                   PROCESS_TYPE_MAX);
 301       }
 302       default:
 303         break;
 304     }
 305     UMA_HISTOGRAM_ENUMERATION("ChildProcess.Disconnected2",
 306                               data_.process_type,
 307                               PROCESS_TYPE_MAX);
 308   }
 309   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
 310                           base::Bind(&NotifyProcessHostDisconnected, data_));
 311   delete delegate_;  // Will delete us
 312 }
 313
 314 bool BrowserChildProcessHostImpl::Send(IPC::Message* message) {
 315   return child_process_host_->Send(message);
 316 }
 317
 318 void BrowserChildProcessHostImpl::OnProcessLaunchFailed() {
 319   delegate_->OnProcessLaunchFailed();
 320   delete delegate_;  // Will delete us
 321 }
 322
 323 void BrowserChildProcessHostImpl::OnProcessLaunched() {
 324   base::ProcessHandle handle = child_process_->GetHandle();
 325   if (!handle) {
 326     delete delegate_;  // Will delete us
 327     return;
 328   }
 329
 330 #if defined(OS_WIN)
 331   // Start a WaitableEventWatcher that will invoke OnProcessExitedEarly if the
 332   // child process exits. This watcher is stopped once the IPC channel is
 333   // connected and the exit of the child process is detecter by an error on the
 334   // IPC channel thereafter.
 335   DCHECK(!early_exit_watcher_.GetWatchedEvent());
 336   early_exit_watcher_.StartWatching(
 337       new base::WaitableEvent(handle),
 338       base::Bind(&BrowserChildProcessHostImpl::OnProcessExitedEarly,
 339                  base::Unretained(this)));
 340 #endif
 341
 342   data_.handle = handle;
 343   delegate_->OnProcessLaunched();
 344 }
 345
 346 #if defined(OS_WIN)
 347
 348 void BrowserChildProcessHostImpl::DeleteProcessWaitableEvent(
 349     base::WaitableEvent* event) {
 350   if (!event)
 351     return;
 352
 353   // The WaitableEvent does not own the process handle so ensure it does not
 354   // close it.
 355   event->Release();
 356
 357   delete event;
 358 }
 359
 360 void BrowserChildProcessHostImpl::OnProcessExitedEarly(
 361     base::WaitableEvent* event) {
 362   DeleteProcessWaitableEvent(event);
 363   OnChildDisconnected();
 364 }
 365
 366 #endif
 367
 368 }  // namespace content