content/app/content_main_runner.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/public/app/content_main_runner.h"
   6
   7 #include <stdlib.h>
   8
   9 #include "base/allocator/allocator_extension.h"
  10 #include "base/at_exit.h"
  11 #include "base/command_line.h"
  12 #include "base/debug/debugger.h"
  13 #include "base/files/file_path.h"
  14 #include "base/i18n/icu_util.h"
  15 #include "base/lazy_instance.h"
  16 #include "base/logging.h"
  17 #include "base/memory/scoped_ptr.h"
  18 #include "base/memory/scoped_vector.h"
  19 #include "base/metrics/statistics_recorder.h"
  20 #include "base/path_service.h"
  21 #include "base/process/launch.h"
  22 #include "base/process/memory.h"
  23 #include "base/process/process_handle.h"
  24 #include "base/profiler/alternate_timer.h"
  25 #include "base/profiler/scoped_tracker.h"
  26 #include "base/strings/string_number_conversions.h"
  27 #include "base/strings/string_util.h"
  28 #include "base/strings/stringprintf.h"
  29 #include "base/trace_event/trace_event.h"
  30 #include "components/tracing/startup_tracing.h"
  31 #include "content/browser/browser_main.h"
  32 #include "content/common/set_process_title.h"
  33 #include "content/common/url_schemes.h"
  34 #include "content/gpu/in_process_gpu_thread.h"
  35 #include "content/public/app/content_main.h"
  36 #include "content/public/app/content_main_delegate.h"
  37 #include "content/public/app/startup_helper_win.h"
  38 #include "content/public/browser/content_browser_client.h"
  39 #include "content/public/common/content_client.h"
  40 #include "content/public/common/content_constants.h"
  41 #include "content/public/common/content_paths.h"
  42 #include "content/public/common/content_switches.h"
  43 #include "content/public/common/main_function_params.h"
  44 #include "content/public/common/sandbox_init.h"
  45 #include "content/renderer/in_process_renderer_thread.h"
  46 #include "content/utility/in_process_utility_thread.h"
  47 #include "crypto/nss_util.h"
  48 #include "ipc/ipc_descriptors.h"
  49 #include "ipc/ipc_switches.h"
  50 #include "media/base/media.h"
  51 #include "sandbox/win/src/sandbox_types.h"
  52 #include "ui/base/ui_base_paths.h"
  53 #include "ui/base/ui_base_switches.h"
  54
  55 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
  56 #include "gin/v8_initializer.h"
  57 #endif
  58
  59 #if defined(USE_TCMALLOC)
  60 #include "third_party/tcmalloc/chromium/src/gperftools/malloc_extension.h"
  61 #if defined(TYPE_PROFILING)
  62 #include "base/allocator/type_profiler.h"
  63 #include "base/allocator/type_profiler_tcmalloc.h"
  64 #endif
  65 #endif
  66
  67 #if !defined(OS_IOS)
  68 #include "content/app/mojo/mojo_init.h"
  69 #include "content/browser/gpu/gpu_process_host.h"
  70 #include "content/browser/renderer_host/render_process_host_impl.h"
  71 #include "content/browser/utility_process_host_impl.h"
  72 #include "content/public/plugin/content_plugin_client.h"
  73 #include "content/public/renderer/content_renderer_client.h"
  74 #include "content/public/utility/content_utility_client.h"
  75 #endif
  76
  77 #if defined(OS_WIN)
  78 #include <malloc.h>
  79 #include <cstring>
  80
  81 #include "base/strings/string_number_conversions.h"
  82 #include "base/trace_event/trace_event_etw_export_win.h"
  83 #include "ui/base/win/atl_module.h"
  84 #include "ui/gfx/win/dpi.h"
  85 #elif defined(OS_MACOSX)
  86 #include "base/mac/scoped_nsautorelease_pool.h"
  87 #if !defined(OS_IOS)
  88 #include "base/power_monitor/power_monitor_device_source.h"
  89 #include "content/app/mac/mac_init.h"
  90 #include "content/browser/browser_io_surface_manager_mac.h"
  91 #include "content/browser/mach_broker_mac.h"
  92 #include "content/child/child_io_surface_manager_mac.h"
  93 #include "content/common/sandbox_init_mac.h"
  94 #endif  // !OS_IOS
  95 #endif  // OS_WIN
  96
  97 #if defined(OS_POSIX)
  98 #include <signal.h>
  99
 100 #include "base/posix/global_descriptors.h"
 101 #include "content/public/common/content_descriptors.h"
 102
 103 #if !defined(OS_MACOSX)
 104 #include "content/public/common/content_descriptors.h"
 105 #include "content/public/common/zygote_fork_delegate_linux.h"
 106 #endif
 107 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
 108 #include "content/zygote/zygote_main.h"
 109 #endif
 110
 111 #endif  // OS_POSIX
 112
 113 #if !defined(OS_MACOSX) && defined(USE_TCMALLOC)
 114 extern "C" {
 115 int tc_set_new_mode(int mode);
 116 }
 117 #endif
 118
 119 namespace content {
 120 extern int GpuMain(const content::MainFunctionParams&);
 121 #if defined(ENABLE_PLUGINS)
 122 #if !defined(OS_LINUX)
 123 extern int PluginMain(const content::MainFunctionParams&);
 124 #endif
 125 extern int PpapiPluginMain(const MainFunctionParams&);
 126 extern int PpapiBrokerMain(const MainFunctionParams&);
 127 #endif
 128 extern int RendererMain(const content::MainFunctionParams&);
 129 extern int UtilityMain(const MainFunctionParams&);
 130 }  // namespace content
 131
 132 namespace content {
 133
 134 #if !defined(CHROME_MULTIPLE_DLL_CHILD)
 135 base::LazyInstance<ContentBrowserClient>
 136     g_empty_content_browser_client = LAZY_INSTANCE_INITIALIZER;
 137 #endif  //  !CHROME_MULTIPLE_DLL_CHILD
 138
 139 #if !defined(OS_IOS) && !defined(CHROME_MULTIPLE_DLL_BROWSER)
 140 base::LazyInstance<ContentPluginClient>
 141     g_empty_content_plugin_client = LAZY_INSTANCE_INITIALIZER;
 142 base::LazyInstance<ContentRendererClient>
 143     g_empty_content_renderer_client = LAZY_INSTANCE_INITIALIZER;
 144 base::LazyInstance<ContentUtilityClient>
 145     g_empty_content_utility_client = LAZY_INSTANCE_INITIALIZER;
 146 #endif  // !OS_IOS && !CHROME_MULTIPLE_DLL_BROWSER
 147
 148 #if defined(OS_WIN)
 149
 150 #endif  // defined(OS_WIN)
 151
 152 #if defined(OS_POSIX) && !defined(OS_IOS)
 153
 154 // Setup signal-handling state: resanitize most signals, ignore SIGPIPE.
 155 void SetupSignalHandlers() {
 156   // Sanitise our signal handling state. Signals that were ignored by our
 157   // parent will also be ignored by us. We also inherit our parent's sigmask.
 158   sigset_t empty_signal_set;
 159   CHECK(0 == sigemptyset(&empty_signal_set));
 160   CHECK(0 == sigprocmask(SIG_SETMASK, &empty_signal_set, NULL));
 161
 162   struct sigaction sigact;
 163   memset(&sigact, 0, sizeof(sigact));
 164   sigact.sa_handler = SIG_DFL;
 165   static const int signals_to_reset[] =
 166       {SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGABRT, SIGFPE, SIGSEGV,
 167        SIGALRM, SIGTERM, SIGCHLD, SIGBUS, SIGTRAP};  // SIGPIPE is set below.
 168   for (unsigned i = 0; i < arraysize(signals_to_reset); i++) {
 169     CHECK(0 == sigaction(signals_to_reset[i], &sigact, NULL));
 170   }
 171
 172   // Always ignore SIGPIPE.  We check the return value of write().
 173   CHECK(signal(SIGPIPE, SIG_IGN) != SIG_ERR);
 174 }
 175
 176 #endif  // OS_POSIX && !OS_IOS
 177
 178 void CommonSubprocessInit(const std::string& process_type) {
 179 #if defined(OS_WIN)
 180   // HACK: Let Windows know that we have started.  This is needed to suppress
 181   // the IDC_APPSTARTING cursor from being displayed for a prolonged period
 182   // while a subprocess is starting.
 183   PostThreadMessage(GetCurrentThreadId(), WM_NULL, 0, 0);
 184   MSG msg;
 185   PeekMessage(&msg, NULL, 0, 0, PM_REMOVE);
 186 #endif
 187 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 188   // Various things break when you're using a locale where the decimal
 189   // separator isn't a period.  See e.g. bugs 22782 and 39964.  For
 190   // all processes except the browser process (where we call system
 191   // APIs that may rely on the correct locale for formatting numbers
 192   // when presenting them to the user), reset the locale for numeric
 193   // formatting.
 194   // Note that this is not correct for plugin processes -- they can
 195   // surface UI -- but it's likely they get this wrong too so why not.
 196   setlocale(LC_NUMERIC, "C");
 197 #endif
 198 }
 199
 200 class ContentClientInitializer {
 201  public:
 202   static void Set(const std::string& process_type,
 203                   ContentMainDelegate* delegate) {
 204     ContentClient* content_client = GetContentClient();
 205 #if !defined(CHROME_MULTIPLE_DLL_CHILD)
 206     if (process_type.empty()) {
 207       if (delegate)
 208         content_client->browser_ = delegate->CreateContentBrowserClient();
 209       if (!content_client->browser_)
 210         content_client->browser_ = &g_empty_content_browser_client.Get();
 211     }
 212 #endif  // !CHROME_MULTIPLE_DLL_CHILD
 213
 214 #if !defined(OS_IOS) && !defined(CHROME_MULTIPLE_DLL_BROWSER)
 215     if (process_type == switches::kPluginProcess ||
 216         process_type == switches::kPpapiPluginProcess) {
 217       if (delegate)
 218         content_client->plugin_ = delegate->CreateContentPluginClient();
 219       if (!content_client->plugin_)
 220         content_client->plugin_ = &g_empty_content_plugin_client.Get();
 221       // Single process not supported in split dll mode.
 222     } else if (process_type == switches::kRendererProcess ||
 223                base::CommandLine::ForCurrentProcess()->HasSwitch(
 224                    switches::kSingleProcess)) {
 225       if (delegate)
 226         content_client->renderer_ = delegate->CreateContentRendererClient();
 227       if (!content_client->renderer_)
 228         content_client->renderer_ = &g_empty_content_renderer_client.Get();
 229     }
 230
 231     if (process_type == switches::kUtilityProcess ||
 232         base::CommandLine::ForCurrentProcess()->HasSwitch(
 233             switches::kSingleProcess)) {
 234       if (delegate)
 235         content_client->utility_ = delegate->CreateContentUtilityClient();
 236       // TODO(scottmg): http://crbug.com/237249 Should be in _child.
 237       if (!content_client->utility_)
 238         content_client->utility_ = &g_empty_content_utility_client.Get();
 239     }
 240 #endif  // !OS_IOS && !CHROME_MULTIPLE_DLL_BROWSER
 241   }
 242 };
 243
 244 // We dispatch to a process-type-specific FooMain() based on a command-line
 245 // flag.  This struct is used to build a table of (flag, main function) pairs.
 246 struct MainFunction {
 247   const char* name;
 248   int (*function)(const MainFunctionParams&);
 249 };
 250
 251 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 252 // On platforms that use the zygote, we have a special subset of
 253 // subprocesses that are launched via the zygote.  This function
 254 // fills in some process-launching bits around ZygoteMain().
 255 // Returns the exit code of the subprocess.
 256 int RunZygote(const MainFunctionParams& main_function_params,
 257               ContentMainDelegate* delegate) {
 258   static const MainFunction kMainFunctions[] = {
 259     { switches::kRendererProcess,    RendererMain },
 260 #if defined(ENABLE_PLUGINS)
 261     { switches::kPpapiPluginProcess, PpapiPluginMain },
 262 #endif
 263     { switches::kUtilityProcess,     UtilityMain },
 264   };
 265
 266   ScopedVector<ZygoteForkDelegate> zygote_fork_delegates;
 267   if (delegate) {
 268     delegate->ZygoteStarting(&zygote_fork_delegates);
 269     media::InitializeMediaLibrary();
 270   }
 271
 272   // This function call can return multiple times, once per fork().
 273   if (!ZygoteMain(main_function_params, zygote_fork_delegates.Pass()))
 274     return 1;
 275
 276   if (delegate) delegate->ZygoteForked();
 277
 278   // Zygote::HandleForkRequest may have reallocated the command
 279   // line so update it here with the new version.
 280   const base::CommandLine& command_line =
 281       *base::CommandLine::ForCurrentProcess();
 282   std::string process_type =
 283       command_line.GetSwitchValueASCII(switches::kProcessType);
 284   ContentClientInitializer::Set(process_type, delegate);
 285
 286   MainFunctionParams main_params(command_line);
 287   main_params.zygote_child = true;
 288
 289   for (size_t i = 0; i < arraysize(kMainFunctions); ++i) {
 290     if (process_type == kMainFunctions[i].name)
 291       return kMainFunctions[i].function(main_params);
 292   }
 293
 294   if (delegate)
 295     return delegate->RunProcess(process_type, main_params);
 296
 297   NOTREACHED() << "Unknown zygote process type: " << process_type;
 298   return 1;
 299 }
 300 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 301
 302 #if !defined(OS_IOS)
 303 static void RegisterMainThreadFactories() {
 304 #if !defined(CHROME_MULTIPLE_DLL_BROWSER) && !defined(CHROME_MULTIPLE_DLL_CHILD)
 305   UtilityProcessHostImpl::RegisterUtilityMainThreadFactory(
 306       CreateInProcessUtilityThread);
 307   RenderProcessHostImpl::RegisterRendererMainThreadFactory(
 308       CreateInProcessRendererThread);
 309   GpuProcessHost::RegisterGpuMainThreadFactory(
 310       CreateInProcessGpuThread);
 311 #else
 312   base::CommandLine& command_line = *base::CommandLine::ForCurrentProcess();
 313   if (command_line.HasSwitch(switches::kSingleProcess)) {
 314     LOG(FATAL) <<
 315         "--single-process is not supported in chrome multiple dll browser.";
 316   }
 317   if (command_line.HasSwitch(switches::kInProcessGPU)) {
 318     LOG(FATAL) <<
 319         "--in-process-gpu is not supported in chrome multiple dll browser.";
 320   }
 321 #endif  // !CHROME_MULTIPLE_DLL_BROWSER && !CHROME_MULTIPLE_DLL_CHILD
 322 }
 323
 324 // Run the FooMain() for a given process type.
 325 // If |process_type| is empty, runs BrowserMain().
 326 // Returns the exit code for this process.
 327 int RunNamedProcessTypeMain(
 328     const std::string& process_type,
 329     const MainFunctionParams& main_function_params,
 330     ContentMainDelegate* delegate) {
 331   static const MainFunction kMainFunctions[] = {
 332 #if !defined(CHROME_MULTIPLE_DLL_CHILD)
 333     { "",                            BrowserMain },
 334 #endif
 335 #if !defined(CHROME_MULTIPLE_DLL_BROWSER)
 336 #if defined(ENABLE_PLUGINS)
 337 #if !defined(OS_LINUX)
 338     { switches::kPluginProcess,      PluginMain },
 339 #endif
 340     { switches::kPpapiPluginProcess, PpapiPluginMain },
 341     { switches::kPpapiBrokerProcess, PpapiBrokerMain },
 342 #endif  // ENABLE_PLUGINS
 343     { switches::kUtilityProcess,     UtilityMain },
 344     { switches::kRendererProcess,    RendererMain },
 345     { switches::kGpuProcess,         GpuMain },
 346 #endif  // !CHROME_MULTIPLE_DLL_BROWSER
 347   };
 348
 349   RegisterMainThreadFactories();
 350
 351   for (size_t i = 0; i < arraysize(kMainFunctions); ++i) {
 352     if (process_type == kMainFunctions[i].name) {
 353       if (delegate) {
 354         int exit_code = delegate->RunProcess(process_type,
 355             main_function_params);
 356 #if defined(OS_ANDROID)
 357         // In Android's browser process, the negative exit code doesn't mean the
 358         // default behavior should be used as the UI message loop is managed by
 359         // the Java and the browser process's default behavior is always
 360         // overridden.
 361         if (process_type.empty())
 362           return exit_code;
 363 #endif
 364         if (exit_code >= 0)
 365           return exit_code;
 366       }
 367       return kMainFunctions[i].function(main_function_params);
 368     }
 369   }
 370
 371 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 372   // Zygote startup is special -- see RunZygote comments above
 373   // for why we don't use ZygoteMain directly.
 374   if (process_type == switches::kZygoteProcess)
 375     return RunZygote(main_function_params, delegate);
 376 #endif
 377
 378   // If it's a process we don't know about, the embedder should know.
 379   if (delegate)
 380     return delegate->RunProcess(process_type, main_function_params);
 381
 382   NOTREACHED() << "Unknown process type: " << process_type;
 383   return 1;
 384 }
 385 #endif  // !OS_IOS
 386
 387 class ContentMainRunnerImpl : public ContentMainRunner {
 388  public:
 389   ContentMainRunnerImpl()
 390       : is_initialized_(false),
 391         is_shutdown_(false),
 392         completed_basic_startup_(false),
 393         delegate_(NULL),
 394         ui_task_(NULL) {
 395 #if defined(OS_WIN)
 396     memset(&sandbox_info_, 0, sizeof(sandbox_info_));
 397 #endif
 398   }
 399
 400   ~ContentMainRunnerImpl() override {
 401     if (is_initialized_ && !is_shutdown_)
 402       Shutdown();
 403   }
 404
 405 #if defined(USE_TCMALLOC)
 406   static bool GetAllocatorWasteSizeThunk(size_t* size) {
 407     size_t heap_size, allocated_bytes, unmapped_bytes;
 408     MallocExtension* ext = MallocExtension::instance();
 409     if (ext->GetNumericProperty("generic.heap_size", &heap_size) &&
 410         ext->GetNumericProperty("generic.current_allocated_bytes",
 411                                 &allocated_bytes) &&
 412         ext->GetNumericProperty("tcmalloc.pageheap_unmapped_bytes",
 413                                 &unmapped_bytes)) {
 414       *size = heap_size - allocated_bytes - unmapped_bytes;
 415       return true;
 416     }
 417     DCHECK(false);
 418     return false;
 419   }
 420
 421   static void GetStatsThunk(char* buffer, int buffer_length) {
 422     MallocExtension::instance()->GetStats(buffer, buffer_length);
 423   }
 424
 425   static void ReleaseFreeMemoryThunk() {
 426     MallocExtension::instance()->ReleaseFreeMemory();
 427   }
 428 #endif
 429
 430   int Initialize(const ContentMainParams& params) override {
 431     ui_task_ = params.ui_task;
 432
 433     base::EnableTerminationOnOutOfMemory();
 434 #if defined(OS_WIN)
 435     RegisterInvalidParamHandler();
 436     ui::win::CreateATLModuleIfNeeded();
 437
 438     sandbox_info_ = *params.sandbox_info;
 439 #else  // !OS_WIN
 440
 441 #if defined(OS_ANDROID)
 442     // See note at the initialization of ExitManager, below; basically,
 443     // only Android builds have the ctor/dtor handlers set up to use
 444     // TRACE_EVENT right away.
 445     TRACE_EVENT0("startup", "ContentMainRunnerImpl::Initialize");
 446 #endif  // OS_ANDROID
 447
 448     // NOTE(willchan): One might ask why these TCMalloc-related calls are done
 449     // here rather than in process_util_linux.cc with the definition of
 450     // EnableTerminationOnOutOfMemory().  That's because base shouldn't have a
 451     // dependency on TCMalloc.  Really, we ought to have our allocator shim code
 452     // implement this EnableTerminationOnOutOfMemory() function.  Whateverz.
 453     // This works for now.
 454 #if !defined(OS_MACOSX) && defined(USE_TCMALLOC)
 455
 456 #if defined(TYPE_PROFILING)
 457     base::type_profiler::InterceptFunctions::SetFunctions(
 458         base::type_profiler::NewInterceptForTCMalloc,
 459         base::type_profiler::DeleteInterceptForTCMalloc);
 460 #endif
 461
 462     // For tcmalloc, we need to tell it to behave like new.
 463     tc_set_new_mode(1);
 464
 465     // On windows, we've already set these thunks up in _heap_init()
 466     base::allocator::SetGetAllocatorWasteSizeFunction(
 467         GetAllocatorWasteSizeThunk);
 468     base::allocator::SetGetStatsFunction(GetStatsThunk);
 469     base::allocator::SetReleaseFreeMemoryFunction(ReleaseFreeMemoryThunk);
 470
 471     // Provide optional hook for monitoring allocation quantities on a
 472     // per-thread basis.  Only set the hook if the environment indicates this
 473     // needs to be enabled.
 474     const char* profiling = getenv(tracked_objects::kAlternateProfilerTime);
 475     if (profiling &&
 476         (atoi(profiling) == tracked_objects::TIME_SOURCE_TYPE_TCMALLOC)) {
 477       tracked_objects::SetAlternateTimeSource(
 478           MallocExtension::GetBytesAllocatedOnCurrentThread,
 479           tracked_objects::TIME_SOURCE_TYPE_TCMALLOC);
 480     }
 481 #endif  // !OS_MACOSX && USE_TCMALLOC
 482
 483 #if !defined(OS_IOS)
 484     base::GlobalDescriptors* g_fds = base::GlobalDescriptors::GetInstance();
 485 #endif
 486
 487     // On Android,
 488     // - setlocale() is not supported.
 489     // - We do not override the signal handlers so that we can get
 490     //   stack trace when crashing.
 491     // - The ipc_fd is passed through the Java service.
 492     // Thus, these are all disabled.
 493 #if !defined(OS_ANDROID) && !defined(OS_IOS)
 494     // Set C library locale to make sure CommandLine can parse argument values
 495     // in correct encoding.
 496     setlocale(LC_ALL, "");
 497
 498     SetupSignalHandlers();
 499     g_fds->Set(kPrimaryIPCChannel,
 500                kPrimaryIPCChannel + base::GlobalDescriptors::kBaseDescriptor);
 501 #endif  // !OS_ANDROID && !OS_IOS
 502
 503 #if defined(OS_LINUX) || defined(OS_OPENBSD)
 504     g_fds->Set(kCrashDumpSignal,
 505                kCrashDumpSignal + base::GlobalDescriptors::kBaseDescriptor);
 506 #endif  // OS_LINUX || OS_OPENBSD
 507
 508
 509 #endif  // !OS_WIN
 510
 511     is_initialized_ = true;
 512     delegate_ = params.delegate;
 513
 514     // The exit manager is in charge of calling the dtors of singleton objects.
 515     // On Android, AtExitManager is set up when library is loaded.
 516     // On iOS, it's set up in main(), which can't call directly through to here.
 517     // A consequence of this is that you can't use the ctor/dtor-based
 518     // TRACE_EVENT methods on Linux or iOS builds till after we set this up.
 519 #if !defined(OS_ANDROID) && !defined(OS_IOS)
 520     if (!ui_task_) {
 521       // When running browser tests, don't create a second AtExitManager as that
 522       // interfers with shutdown when objects created before ContentMain is
 523       // called are destructed when it returns.
 524       exit_manager_.reset(new base::AtExitManager);
 525     }
 526 #endif  // !OS_ANDROID && !OS_IOS
 527
 528     // Don't create this loop on iOS, since the outer loop is already handled
 529     // and a loop that's destroyed in shutdown interleaves badly with the event
 530     // loop pool on iOS.
 531 #if defined(OS_MACOSX) && !defined(OS_IOS)
 532     // We need this pool for all the objects created before we get to the
 533     // event loop, but we don't want to leave them hanging around until the
 534     // app quits. Each "main" needs to flush this pool right before it goes into
 535     // its main event loop to get rid of the cruft.
 536     autorelease_pool_.reset(new base::mac::ScopedNSAutoreleasePool());
 537     InitializeMac();
 538 #endif
 539
 540     // On Android, the command line is initialized when library is loaded and
 541     // we have already started our TRACE_EVENT0.
 542 #if !defined(OS_ANDROID)
 543     // argc/argv are ignored on Windows and Android; see command_line.h for
 544     // details.
 545     int argc = 0;
 546     const char** argv = NULL;
 547
 548 #if !defined(OS_WIN)
 549     argc = params.argc;
 550     argv = params.argv;
 551 #endif
 552
 553     base::CommandLine::Init(argc, argv);
 554
 555     base::EnableTerminationOnHeapCorruption();
 556
 557     // TODO(yiyaoliu, vadimt): Remove this once crbug.com/453640 is fixed.
 558     // Enable profiler recording right after command line is initialized so that
 559     // browser startup can be instrumented.
 560     if (delegate_ && delegate_->ShouldEnableProfilerRecording())
 561       tracked_objects::ScopedTracker::Enable();
 562
 563 #if !defined(OS_IOS)
 564     SetProcessTitleFromCommandLine(argv);
 565 #endif
 566 #endif // !OS_ANDROID
 567
 568     int exit_code = 0;
 569     if (delegate_ && delegate_->BasicStartupComplete(&exit_code))
 570       return exit_code;
 571
 572     completed_basic_startup_ = true;
 573
 574     const base::CommandLine& command_line =
 575         *base::CommandLine::ForCurrentProcess();
 576     std::string process_type =
 577         command_line.GetSwitchValueASCII(switches::kProcessType);
 578
 579 #if !defined(OS_IOS)
 580     // Initialize mojo here so that services can be registered.
 581     InitializeMojo();
 582 #endif
 583
 584 #if defined(OS_WIN)
 585     bool init_device_scale_factor = true;
 586     if (command_line.HasSwitch(switches::kDeviceScaleFactor)) {
 587       std::string scale_factor_string = command_line.GetSwitchValueASCII(
 588           switches::kDeviceScaleFactor);
 589       double scale_factor = 0;
 590       if (base::StringToDouble(scale_factor_string, &scale_factor)) {
 591         init_device_scale_factor = false;
 592         gfx::InitDeviceScaleFactor(scale_factor);
 593       }
 594     }
 595     if (init_device_scale_factor)
 596       gfx::InitDeviceScaleFactor(gfx::GetDPIScale());
 597 #endif
 598
 599     if (!GetContentClient())
 600       SetContentClient(&empty_content_client_);
 601     ContentClientInitializer::Set(process_type, delegate_);
 602
 603 #if defined(OS_WIN)
 604     // Route stdio to parent console (if any) or create one.
 605     if (command_line.HasSwitch(switches::kEnableLogging))
 606       base::RouteStdioToConsole();
 607 #endif
 608
 609     // Enable startup tracing asap to avoid early TRACE_EVENT calls being
 610     // ignored.
 611     if (command_line.HasSwitch(switches::kTraceStartup)) {
 612       base::trace_event::TraceConfig trace_config(
 613           command_line.GetSwitchValueASCII(switches::kTraceStartup),
 614           base::trace_event::RECORD_UNTIL_FULL);
 615       base::trace_event::TraceLog::GetInstance()->SetEnabled(
 616           trace_config,
 617           base::trace_event::TraceLog::RECORDING_MODE);
 618     } else if (process_type != switches::kZygoteProcess &&
 619                process_type != switches::kRendererProcess) {
 620       // There is no need to schedule stopping tracing in this case. Telemetry
 621       // will stop tracing on demand later.
 622       tracing::EnableStartupTracingIfConfigFileExists();
 623     }
 624
 625 #if defined(OS_WIN)
 626     // Enable exporting of events to ETW if requested on the command line.
 627     if (command_line.HasSwitch(switches::kTraceExportEventsToETW))
 628       base::trace_event::TraceEventETWExport::EnableETWExport();
 629 #endif  // OS_WIN
 630
 631 #if !defined(OS_ANDROID)
 632     // Android tracing started at the beginning of the method.
 633     // Other OSes have to wait till we get here in order for all the memory
 634     // management setup to be completed.
 635     TRACE_EVENT0("startup", "ContentMainRunnerImpl::Initialize");
 636 #endif // !OS_ANDROID
 637
 638 #if defined(OS_MACOSX) && !defined(OS_IOS)
 639     // We need to allocate the IO Ports before the Sandbox is initialized or
 640     // the first instance of PowerMonitor is created.
 641     // It's important not to allocate the ports for processes which don't
 642     // register with the power monitor - see crbug.com/88867.
 643     if (process_type.empty() ||
 644         (delegate_ &&
 645          delegate_->ProcessRegistersWithSystemProcess(process_type))) {
 646       base::PowerMonitorDeviceSource::AllocateSystemIOPorts();
 647     }
 648
 649     if (!process_type.empty() &&
 650         (!delegate_ || delegate_->ShouldSendMachPort(process_type))) {
 651       MachBroker::ChildSendTaskPortToParent();
 652     }
 653
 654     if (!command_line.HasSwitch(switches::kSingleProcess) &&
 655         !process_type.empty() && (process_type == switches::kRendererProcess ||
 656                                   process_type == switches::kGpuProcess)) {
 657       base::mac::ScopedMachSendRight service_port =
 658           BrowserIOSurfaceManager::LookupServicePort(getppid());
 659       if (service_port.is_valid()) {
 660         ChildIOSurfaceManager::GetInstance()->set_service_port(
 661             service_port.release());
 662         IOSurfaceManager::SetInstance(ChildIOSurfaceManager::GetInstance());
 663       }
 664     }
 665 #elif defined(OS_WIN)
 666     SetupCRT(command_line);
 667 #endif
 668
 669 #if defined(OS_POSIX)
 670     if (!process_type.empty()) {
 671       // When you hit Ctrl-C in a terminal running the browser
 672       // process, a SIGINT is delivered to the entire process group.
 673       // When debugging the browser process via gdb, gdb catches the
 674       // SIGINT for the browser process (and dumps you back to the gdb
 675       // console) but doesn't for the child processes, killing them.
 676       // The fix is to have child processes ignore SIGINT; they'll die
 677       // on their own when the browser process goes away.
 678       //
 679       // Note that we *can't* rely on BeingDebugged to catch this case because
 680       // we are the child process, which is not being debugged.
 681       // TODO(evanm): move this to some shared subprocess-init function.
 682       if (!base::debug::BeingDebugged())
 683         signal(SIGINT, SIG_IGN);
 684     }
 685 #endif
 686
 687 #if defined(USE_NSS_CERTS)
 688     crypto::EarlySetupForNSSInit();
 689 #endif
 690
 691     ui::RegisterPathProvider();
 692     RegisterPathProvider();
 693     RegisterContentSchemes(true);
 694
 695 #if defined(OS_ANDROID)
 696     int icudata_fd = g_fds->MaybeGet(kAndroidICUDataDescriptor);
 697     if (icudata_fd != -1) {
 698       auto icudata_region = g_fds->GetRegion(kAndroidICUDataDescriptor);
 699       CHECK(base::i18n::InitializeICUWithFileDescriptor(icudata_fd,
 700                                                         icudata_region));
 701     } else {
 702       CHECK(base::i18n::InitializeICU());
 703     }
 704 #else
 705     CHECK(base::i18n::InitializeICU());
 706 #endif  // OS_ANDROID
 707
 708     base::StatisticsRecorder::Initialize();
 709
 710 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
 711 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 712 #if !defined(OS_ANDROID)
 713     // kV8NativesDataDescriptor and kV8SnapshotDataDescriptor could be shared
 714     // with child processes via file descriptors. On Android they are set in
 715     // ChildProcessService::InternalInitChildProcess, otherwise set them here.
 716     if (command_line.HasSwitch(switches::kV8NativesPassedByFD)) {
 717       g_fds->Set(
 718           kV8NativesDataDescriptor,
 719           kV8NativesDataDescriptor + base::GlobalDescriptors::kBaseDescriptor);
 720     }
 721     if (command_line.HasSwitch(switches::kV8SnapshotPassedByFD)) {
 722       g_fds->Set(
 723           kV8SnapshotDataDescriptor,
 724           kV8SnapshotDataDescriptor + base::GlobalDescriptors::kBaseDescriptor);
 725     }
 726 #endif  // !OS_ANDROID
 727     int v8_natives_fd = g_fds->MaybeGet(kV8NativesDataDescriptor);
 728     int v8_snapshot_fd = g_fds->MaybeGet(kV8SnapshotDataDescriptor);
 729     if (v8_snapshot_fd != -1) {
 730       auto v8_snapshot_region = g_fds->GetRegion(kV8SnapshotDataDescriptor);
 731       gin::V8Initializer::LoadV8SnapshotFromFD(
 732           v8_snapshot_fd, v8_snapshot_region.offset, v8_snapshot_region.size);
 733     } else {
 734       gin::V8Initializer::LoadV8Snapshot();
 735     }
 736     if (v8_natives_fd != -1) {
 737       auto v8_natives_region = g_fds->GetRegion(kV8NativesDataDescriptor);
 738       gin::V8Initializer::LoadV8NativesFromFD(
 739           v8_natives_fd, v8_natives_region.offset, v8_natives_region.size);
 740     } else {
 741       gin::V8Initializer::LoadV8Natives();
 742     }
 743 #else
 744     gin::V8Initializer::LoadV8Snapshot();
 745     gin::V8Initializer::LoadV8Natives();
 746 #endif  // OS_POSIX && !OS_MACOSX
 747 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 748
 749     if (delegate_)
 750       delegate_->PreSandboxStartup();
 751
 752     if (!process_type.empty())
 753       CommonSubprocessInit(process_type);
 754
 755 #if defined(OS_WIN)
 756     CHECK(InitializeSandbox(params.sandbox_info));
 757 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 758     if (process_type == switches::kRendererProcess ||
 759         process_type == switches::kPpapiPluginProcess ||
 760         (delegate_ && delegate_->DelaySandboxInitialization(process_type))) {
 761       // On OS X the renderer sandbox needs to be initialized later in the
 762       // startup sequence in RendererMainPlatformDelegate::EnableSandbox().
 763     } else {
 764       CHECK(InitializeSandbox());
 765     }
 766 #endif
 767
 768     if (delegate_)
 769       delegate_->SandboxInitialized(process_type);
 770
 771     // Return -1 to indicate no early termination.
 772     return -1;
 773   }
 774
 775   int Run() override {
 776     DCHECK(is_initialized_);
 777     DCHECK(!is_shutdown_);
 778     const base::CommandLine& command_line =
 779         *base::CommandLine::ForCurrentProcess();
 780     std::string process_type =
 781         command_line.GetSwitchValueASCII(switches::kProcessType);
 782
 783     MainFunctionParams main_params(command_line);
 784     main_params.ui_task = ui_task_;
 785 #if defined(OS_WIN)
 786     main_params.sandbox_info = &sandbox_info_;
 787 #elif defined(OS_MACOSX)
 788     main_params.autorelease_pool = autorelease_pool_.get();
 789 #endif
 790
 791 #if !defined(OS_IOS)
 792     return RunNamedProcessTypeMain(process_type, main_params, delegate_);
 793 #else
 794     return 1;
 795 #endif
 796   }
 797
 798   void Shutdown() override {
 799     DCHECK(is_initialized_);
 800     DCHECK(!is_shutdown_);
 801
 802     if (completed_basic_startup_ && delegate_) {
 803       const base::CommandLine& command_line =
 804           *base::CommandLine::ForCurrentProcess();
 805       std::string process_type =
 806           command_line.GetSwitchValueASCII(switches::kProcessType);
 807
 808       delegate_->ProcessExiting(process_type);
 809     }
 810
 811 #if defined(OS_WIN)
 812 #ifdef _CRTDBG_MAP_ALLOC
 813     _CrtDumpMemoryLeaks();
 814 #endif  // _CRTDBG_MAP_ALLOC
 815 #endif  // OS_WIN
 816
 817 #if defined(OS_MACOSX) && !defined(OS_IOS)
 818     autorelease_pool_.reset(NULL);
 819 #endif
 820
 821     exit_manager_.reset(NULL);
 822
 823     delegate_ = NULL;
 824     is_shutdown_ = true;
 825   }
 826
 827  private:
 828   // True if the runner has been initialized.
 829   bool is_initialized_;
 830
 831   // True if the runner has been shut down.
 832   bool is_shutdown_;
 833
 834   // True if basic startup was completed.
 835   bool completed_basic_startup_;
 836
 837   // Used if the embedder doesn't set one.
 838   ContentClient empty_content_client_;
 839
 840   // The delegate will outlive this object.
 841   ContentMainDelegate* delegate_;
 842
 843   scoped_ptr<base::AtExitManager> exit_manager_;
 844 #if defined(OS_WIN)
 845   sandbox::SandboxInterfaceInfo sandbox_info_;
 846 #elif defined(OS_MACOSX)
 847   scoped_ptr<base::mac::ScopedNSAutoreleasePool> autorelease_pool_;
 848 #endif
 849
 850   base::Closure* ui_task_;
 851
 852   DISALLOW_COPY_AND_ASSIGN(ContentMainRunnerImpl);
 853 };
 854
 855 // static
 856 ContentMainRunner* ContentMainRunner::Create() {
 857   return new ContentMainRunnerImpl();
 858 }
 859
 860 }  // namespace content