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
 111 BrowserChildProcessHostImpl::~BrowserChildProcessHostImpl() {
 112   g_child_process_list.Get().remove(this);
 113
 114 #if defined(OS_WIN)
 115   DeleteProcessWaitableEvent(early_exit_watcher_.GetWatchedEvent());
 116 #endif
 117 }
 118
 119 // static
 120 void BrowserChildProcessHostImpl::TerminateAll() {
 121   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 122   // Make a copy since the BrowserChildProcessHost dtor mutates the original
 123   // list.
 124   BrowserChildProcessList copy = g_child_process_list.Get();
 125   for (BrowserChildProcessList::iterator it = copy.begin();
 126        it != copy.end(); ++it) {
 127     delete (*it)->delegate();  // ~*HostDelegate deletes *HostImpl.
 128   }
 129 }
 130
 131 void BrowserChildProcessHostImpl::Launch(
 132     SandboxedProcessLauncherDelegate* delegate,
 133     CommandLine* cmd_line) {
 134   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 135
 136   GetContentClient()->browser()->AppendExtraCommandLineSwitches(
 137       cmd_line, data_.id);
 138
 139   const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
 140   static const char* kForwardSwitches[] = {
 141     switches::kDisableLogging,
 142     switches::kEnableLogging,
 143     switches::kLoggingLevel,
 144     switches::kTraceToConsole,
 145     switches::kV,
 146     switches::kVModule,
 147 #if defined(OS_WIN)
 148     switches::kEnableHighResolutionTime,
 149 #endif
 150   };
 151   cmd_line->CopySwitchesFrom(browser_command_line, kForwardSwitches,
 152                              arraysize(kForwardSwitches));
 153
 154   child_process_.reset(new ChildProcessLauncher(
 155       delegate,
 156       cmd_line,
 157       data_.id,
 158       this));
 159 }
 160
 161 const ChildProcessData& BrowserChildProcessHostImpl::GetData() const {
 162   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 163   return data_;
 164 }
 165
 166 ChildProcessHost* BrowserChildProcessHostImpl::GetHost() const {
 167   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 168   return child_process_host_.get();
 169 }
 170
 171 base::ProcessHandle BrowserChildProcessHostImpl::GetHandle() const {
 172   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 173   DCHECK(child_process_.get())
 174       << "Requesting a child process handle before launching.";
 175   DCHECK(child_process_->GetHandle())
 176       << "Requesting a child process handle before launch has completed OK.";
 177   return child_process_->GetHandle();
 178 }
 179
 180 void BrowserChildProcessHostImpl::SetNaClDebugStubPort(int port) {
 181   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 182   data_.nacl_debug_stub_port = port;
 183 }
 184
 185 void BrowserChildProcessHostImpl::SetName(const base::string16& name) {
 186   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 187   data_.name = name;
 188 }
 189
 190 void BrowserChildProcessHostImpl::SetHandle(base::ProcessHandle handle) {
 191   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 192   data_.handle = handle;
 193 }
 194
 195 void BrowserChildProcessHostImpl::ForceShutdown() {
 196   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 197   g_child_process_list.Get().remove(this);
 198   child_process_host_->ForceShutdown();
 199 }
 200
 201 void BrowserChildProcessHostImpl::SetBackgrounded(bool backgrounded) {
 202   child_process_->SetProcessBackgrounded(backgrounded);
 203 }
 204
 205 void BrowserChildProcessHostImpl::SetTerminateChildOnShutdown(
 206     bool terminate_on_shutdown) {
 207   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 208   child_process_->SetTerminateChildOnShutdown(terminate_on_shutdown);
 209 }
 210
 211 void BrowserChildProcessHostImpl::AddFilter(BrowserMessageFilter* filter) {
 212   child_process_host_->AddFilter(filter->GetFilter());
 213 }
 214
 215 void BrowserChildProcessHostImpl::NotifyProcessInstanceCreated(
 216     const ChildProcessData& data) {
 217   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 218   FOR_EACH_OBSERVER(BrowserChildProcessObserver, g_observers.Get(),
 219                     BrowserChildProcessInstanceCreated(data));
 220 }
 221
 222 base::TerminationStatus BrowserChildProcessHostImpl::GetTerminationStatus(
 223     bool known_dead, int* exit_code) {
 224   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 225   if (!child_process_)  // If the delegate doesn't use Launch() helper.
 226     return base::GetTerminationStatus(data_.handle, exit_code);
 227   return child_process_->GetChildTerminationStatus(known_dead,
 228                                                    exit_code);
 229 }
 230
 231 bool BrowserChildProcessHostImpl::OnMessageReceived(
 232     const IPC::Message& message) {
 233   return delegate_->OnMessageReceived(message);
 234 }
 235
 236 void BrowserChildProcessHostImpl::OnChannelConnected(int32 peer_pid) {
 237 #if defined(OS_WIN)
 238   // From this point onward, the exit of the child process is detected by an
 239   // error on the IPC channel.
 240   DeleteProcessWaitableEvent(early_exit_watcher_.GetWatchedEvent());
 241   early_exit_watcher_.StopWatching();
 242 #endif
 243
 244   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 245   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
 246                           base::Bind(&NotifyProcessHostConnected, data_));
 247
 248   delegate_->OnChannelConnected(peer_pid);
 249 }
 250
 251 void BrowserChildProcessHostImpl::OnChannelError() {
 252   delegate_->OnChannelError();
 253 }
 254
 255 bool BrowserChildProcessHostImpl::CanShutdown() {
 256   return delegate_->CanShutdown();
 257 }
 258
 259 void BrowserChildProcessHostImpl::OnChildDisconnected() {
 260   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 261   if (child_process_.get() || data_.handle) {
 262     DCHECK(data_.handle != base::kNullProcessHandle);
 263     int exit_code;
 264     base::TerminationStatus status = GetTerminationStatus(
 265         true /* known_dead */, &exit_code);
 266     switch (status) {
 267       case base::TERMINATION_STATUS_PROCESS_CRASHED:
 268       case base::TERMINATION_STATUS_ABNORMAL_TERMINATION: {
 269         delegate_->OnProcessCrashed(exit_code);
 270         BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
 271                                 base::Bind(&NotifyProcessCrashed, data_));
 272         UMA_HISTOGRAM_ENUMERATION("ChildProcess.Crashed2",
 273                                   data_.process_type,
 274                                   PROCESS_TYPE_MAX);
 275         break;
 276       }
 277       case base::TERMINATION_STATUS_PROCESS_WAS_KILLED: {
 278         delegate_->OnProcessCrashed(exit_code);
 279         // Report that this child process was killed.
 280         UMA_HISTOGRAM_ENUMERATION("ChildProcess.Killed2",
 281                                   data_.process_type,
 282                                   PROCESS_TYPE_MAX);
 283         break;
 284       }
 285       case base::TERMINATION_STATUS_STILL_RUNNING: {
 286         UMA_HISTOGRAM_ENUMERATION("ChildProcess.DisconnectedAlive2",
 287                                   data_.process_type,
 288                                   PROCESS_TYPE_MAX);
 289       }
 290       default:
 291         break;
 292     }
 293     UMA_HISTOGRAM_ENUMERATION("ChildProcess.Disconnected2",
 294                               data_.process_type,
 295                               PROCESS_TYPE_MAX);
 296   }
 297   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
 298                           base::Bind(&NotifyProcessHostDisconnected, data_));
 299   delete delegate_;  // Will delete us
 300 }
 301
 302 bool BrowserChildProcessHostImpl::Send(IPC::Message* message) {
 303   return child_process_host_->Send(message);
 304 }
 305
 306 void BrowserChildProcessHostImpl::OnProcessLaunchFailed() {
 307   delegate_->OnProcessLaunchFailed();
 308   delete delegate_;  // Will delete us
 309 }
 310
 311 void BrowserChildProcessHostImpl::OnProcessLaunched() {
 312   base::ProcessHandle handle = child_process_->GetHandle();
 313   if (!handle) {
 314     delete delegate_;  // Will delete us
 315     return;
 316   }
 317
 318 #if defined(OS_WIN)
 319   // Start a WaitableEventWatcher that will invoke OnProcessExitedEarly if the
 320   // child process exits. This watcher is stopped once the IPC channel is
 321   // connected and the exit of the child process is detecter by an error on the
 322   // IPC channel thereafter.
 323   DCHECK(!early_exit_watcher_.GetWatchedEvent());
 324   early_exit_watcher_.StartWatching(
 325       new base::WaitableEvent(handle),
 326       base::Bind(&BrowserChildProcessHostImpl::OnProcessExitedEarly,
 327                  base::Unretained(this)));
 328 #endif
 329
 330   data_.handle = handle;
 331   delegate_->OnProcessLaunched();
 332 }
 333
 334 #if defined(OS_WIN)
 335
 336 void BrowserChildProcessHostImpl::DeleteProcessWaitableEvent(
 337     base::WaitableEvent* event) {
 338   if (!event)
 339     return;
 340
 341   // The WaitableEvent does not own the process handle so ensure it does not
 342   // close it.
 343   event->Release();
 344
 345   delete event;
 346 }
 347
 348 void BrowserChildProcessHostImpl::OnProcessExitedEarly(
 349     base::WaitableEvent* event) {
 350   DeleteProcessWaitableEvent(event);
 351   OnChildDisconnected();
 352 }
 353
 354 #endif
 355
 356 }  // namespace content