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/path_service.h"
  20 #include "base/process/launch.h"
  21 #include "base/process/memory.h"
  22 #include "base/process/process_handle.h"
  23 #include "base/profiler/alternate_timer.h"
  24 #include "base/strings/string_number_conversions.h"
  25 #include "base/strings/string_util.h"
  26 #include "base/strings/stringprintf.h"
  27 #include "base/trace_event/trace_event.h"
  28 #include "content/browser/browser_main.h"
  29 #include "content/common/set_process_title.h"
  30 #include "content/common/url_schemes.h"
  31 #include "content/gpu/in_process_gpu_thread.h"
  32 #include "content/public/app/content_main.h"
  33 #include "content/public/app/content_main_delegate.h"
  34 #include "content/public/app/startup_helper_win.h"
  35 #include "content/public/browser/content_browser_client.h"
  36 #include "content/public/common/content_client.h"
  37 #include "content/public/common/content_constants.h"
  38 #include "content/public/common/content_paths.h"
  39 #include "content/public/common/content_switches.h"
  40 #include "content/public/common/main_function_params.h"
  41 #include "content/public/common/sandbox_init.h"
  42 #include "content/renderer/in_process_renderer_thread.h"
  43 #include "content/utility/in_process_utility_thread.h"
  44 #include "crypto/nss_util.h"
  45 #include "ipc/ipc_descriptors.h"
  46 #include "ipc/ipc_switches.h"
  47 #include "media/base/media.h"
  48 #include "sandbox/win/src/sandbox_types.h"
  49 #include "ui/base/ui_base_paths.h"
  50 #include "ui/base/ui_base_switches.h"
  51
  52 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
  53 #include "gin/public/isolate_holder.h"
  54 #endif
  55
  56 #if defined(USE_TCMALLOC)
  57 #include "third_party/tcmalloc/chromium/src/gperftools/malloc_extension.h"
  58 #if defined(TYPE_PROFILING)
  59 #include "base/allocator/type_profiler.h"
  60 #include "base/allocator/type_profiler_tcmalloc.h"
  61 #endif
  62 #endif
  63
  64 #if !defined(OS_IOS)
  65 #include "content/app/mojo/mojo_init.h"
  66 #include "content/browser/gpu/gpu_process_host.h"
  67 #include "content/browser/renderer_host/render_process_host_impl.h"
  68 #include "content/browser/utility_process_host_impl.h"
  69 #include "content/public/plugin/content_plugin_client.h"
  70 #include "content/public/renderer/content_renderer_client.h"
  71 #include "content/public/utility/content_utility_client.h"
  72 #endif
  73
  74 #if defined(OS_WIN)
  75 #include <malloc.h>
  76 #include <cstring>
  77
  78 #include "base/strings/string_number_conversions.h"
  79 #include "ui/base/win/atl_module.h"
  80 #include "ui/gfx/win/dpi.h"
  81 #elif defined(OS_MACOSX)
  82 #include "base/mac/scoped_nsautorelease_pool.h"
  83 #if !defined(OS_IOS)
  84 #include "base/power_monitor/power_monitor_device_source.h"
  85 #include "content/browser/mach_broker_mac.h"
  86 #include "content/common/sandbox_init_mac.h"
  87 #endif  // !OS_IOS
  88 #endif  // OS_WIN
  89
  90 #if defined(OS_POSIX)
  91 #include <signal.h>
  92
  93 #include "base/posix/global_descriptors.h"
  94 #include "content/public/common/content_descriptors.h"
  95
  96 #if !defined(OS_MACOSX)
  97 #include "content/public/common/content_descriptors.h"
  98 #include "content/public/common/zygote_fork_delegate_linux.h"
  99 #endif
 100 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
 101 #include "content/zygote/zygote_main.h"
 102 #endif
 103
 104 #endif  // OS_POSIX
 105
 106 #if !defined(OS_MACOSX) && defined(USE_TCMALLOC)
 107 extern "C" {
 108 int tc_set_new_mode(int mode);
 109 }
 110 #endif
 111
 112 namespace content {
 113 extern int GpuMain(const content::MainFunctionParams&);
 114 #if defined(ENABLE_PLUGINS)
 115 #if !defined(OS_LINUX)
 116 extern int PluginMain(const content::MainFunctionParams&);
 117 #endif
 118 extern int PpapiPluginMain(const MainFunctionParams&);
 119 extern int PpapiBrokerMain(const MainFunctionParams&);
 120 #endif
 121 extern int RendererMain(const content::MainFunctionParams&);
 122 extern int UtilityMain(const MainFunctionParams&);
 123 }  // namespace content
 124
 125 namespace content {
 126
 127 #if !defined(CHROME_MULTIPLE_DLL_CHILD)
 128 base::LazyInstance<ContentBrowserClient>
 129     g_empty_content_browser_client = LAZY_INSTANCE_INITIALIZER;
 130 #endif  //  !CHROME_MULTIPLE_DLL_CHILD
 131
 132 #if !defined(OS_IOS) && !defined(CHROME_MULTIPLE_DLL_BROWSER)
 133 base::LazyInstance<ContentPluginClient>
 134     g_empty_content_plugin_client = LAZY_INSTANCE_INITIALIZER;
 135 base::LazyInstance<ContentRendererClient>
 136     g_empty_content_renderer_client = LAZY_INSTANCE_INITIALIZER;
 137 base::LazyInstance<ContentUtilityClient>
 138     g_empty_content_utility_client = LAZY_INSTANCE_INITIALIZER;
 139 #endif  // !OS_IOS && !CHROME_MULTIPLE_DLL_BROWSER
 140
 141 #if defined(OS_WIN)
 142
 143 #endif  // defined(OS_WIN)
 144
 145 #if defined(OS_POSIX) && !defined(OS_IOS)
 146
 147 // Setup signal-handling state: resanitize most signals, ignore SIGPIPE.
 148 void SetupSignalHandlers() {
 149   // Sanitise our signal handling state. Signals that were ignored by our
 150   // parent will also be ignored by us. We also inherit our parent's sigmask.
 151   sigset_t empty_signal_set;
 152   CHECK(0 == sigemptyset(&empty_signal_set));
 153   CHECK(0 == sigprocmask(SIG_SETMASK, &empty_signal_set, NULL));
 154
 155   struct sigaction sigact;
 156   memset(&sigact, 0, sizeof(sigact));
 157   sigact.sa_handler = SIG_DFL;
 158   static const int signals_to_reset[] =
 159       {SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGABRT, SIGFPE, SIGSEGV,
 160        SIGALRM, SIGTERM, SIGCHLD, SIGBUS, SIGTRAP};  // SIGPIPE is set below.
 161   for (unsigned i = 0; i < arraysize(signals_to_reset); i++) {
 162     CHECK(0 == sigaction(signals_to_reset[i], &sigact, NULL));
 163   }
 164
 165   // Always ignore SIGPIPE.  We check the return value of write().
 166   CHECK(signal(SIGPIPE, SIG_IGN) != SIG_ERR);
 167 }
 168
 169 #endif  // OS_POSIX && !OS_IOS
 170
 171 void CommonSubprocessInit(const std::string& process_type) {
 172 #if defined(OS_WIN)
 173   // HACK: Let Windows know that we have started.  This is needed to suppress
 174   // the IDC_APPSTARTING cursor from being displayed for a prolonged period
 175   // while a subprocess is starting.
 176   PostThreadMessage(GetCurrentThreadId(), WM_NULL, 0, 0);
 177   MSG msg;
 178   PeekMessage(&msg, NULL, 0, 0, PM_REMOVE);
 179 #endif
 180 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 181   // Various things break when you're using a locale where the decimal
 182   // separator isn't a period.  See e.g. bugs 22782 and 39964.  For
 183   // all processes except the browser process (where we call system
 184   // APIs that may rely on the correct locale for formatting numbers
 185   // when presenting them to the user), reset the locale for numeric
 186   // formatting.
 187   // Note that this is not correct for plugin processes -- they can
 188   // surface UI -- but it's likely they get this wrong too so why not.
 189   setlocale(LC_NUMERIC, "C");
 190 #endif
 191 }
 192
 193 // Only needed on Windows for creating stats tables.
 194 #if defined(OS_WIN)
 195 static base::ProcessId GetBrowserPid(const base::CommandLine& command_line) {
 196   base::ProcessId browser_pid = base::GetCurrentProcId();
 197   if (command_line.HasSwitch(switches::kProcessChannelID)) {
 198     std::string channel_name =
 199         command_line.GetSwitchValueASCII(switches::kProcessChannelID);
 200
 201     int browser_pid_int;
 202     base::StringToInt(channel_name, &browser_pid_int);
 203     browser_pid = static_cast<base::ProcessId>(browser_pid_int);
 204     DCHECK_NE(browser_pid_int, 0);
 205   }
 206   return browser_pid;
 207 }
 208 #endif
 209
 210 class ContentClientInitializer {
 211  public:
 212   static void Set(const std::string& process_type,
 213                   ContentMainDelegate* delegate) {
 214     ContentClient* content_client = GetContentClient();
 215 #if !defined(CHROME_MULTIPLE_DLL_CHILD)
 216     if (process_type.empty()) {
 217       if (delegate)
 218         content_client->browser_ = delegate->CreateContentBrowserClient();
 219       if (!content_client->browser_)
 220         content_client->browser_ = &g_empty_content_browser_client.Get();
 221     }
 222 #endif  // !CHROME_MULTIPLE_DLL_CHILD
 223
 224 #if !defined(OS_IOS) && !defined(CHROME_MULTIPLE_DLL_BROWSER)
 225     if (process_type == switches::kPluginProcess ||
 226         process_type == switches::kPpapiPluginProcess) {
 227       if (delegate)
 228         content_client->plugin_ = delegate->CreateContentPluginClient();
 229       if (!content_client->plugin_)
 230         content_client->plugin_ = &g_empty_content_plugin_client.Get();
 231       // Single process not supported in split dll mode.
 232     } else if (process_type == switches::kRendererProcess ||
 233                base::CommandLine::ForCurrentProcess()->HasSwitch(
 234                    switches::kSingleProcess)) {
 235       if (delegate)
 236         content_client->renderer_ = delegate->CreateContentRendererClient();
 237       if (!content_client->renderer_)
 238         content_client->renderer_ = &g_empty_content_renderer_client.Get();
 239     }
 240
 241     if (process_type == switches::kUtilityProcess ||
 242         base::CommandLine::ForCurrentProcess()->HasSwitch(
 243             switches::kSingleProcess)) {
 244       if (delegate)
 245         content_client->utility_ = delegate->CreateContentUtilityClient();
 246       // TODO(scottmg): http://crbug.com/237249 Should be in _child.
 247       if (!content_client->utility_)
 248         content_client->utility_ = &g_empty_content_utility_client.Get();
 249     }
 250 #endif  // !OS_IOS && !CHROME_MULTIPLE_DLL_BROWSER
 251   }
 252 };
 253
 254 // We dispatch to a process-type-specific FooMain() based on a command-line
 255 // flag.  This struct is used to build a table of (flag, main function) pairs.
 256 struct MainFunction {
 257   const char* name;
 258   int (*function)(const MainFunctionParams&);
 259 };
 260
 261 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 262 // On platforms that use the zygote, we have a special subset of
 263 // subprocesses that are launched via the zygote.  This function
 264 // fills in some process-launching bits around ZygoteMain().
 265 // Returns the exit code of the subprocess.
 266 int RunZygote(const MainFunctionParams& main_function_params,
 267               ContentMainDelegate* delegate) {
 268   static const MainFunction kMainFunctions[] = {
 269     { switches::kRendererProcess,    RendererMain },
 270 #if defined(ENABLE_PLUGINS)
 271     { switches::kPpapiPluginProcess, PpapiPluginMain },
 272 #endif
 273     { switches::kUtilityProcess,     UtilityMain },
 274   };
 275
 276   ScopedVector<ZygoteForkDelegate> zygote_fork_delegates;
 277   if (delegate) {
 278     delegate->ZygoteStarting(&zygote_fork_delegates);
 279     // Each Renderer we spawn will re-attempt initialization of the media
 280     // libraries, at which point failure will be detected and handled, so
 281     // we do not need to cope with initialization failures here.
 282     base::FilePath media_path;
 283     if (PathService::Get(DIR_MEDIA_LIBS, &media_path))
 284       media::InitializeMediaLibrary(media_path);
 285   }
 286
 287   // This function call can return multiple times, once per fork().
 288   if (!ZygoteMain(main_function_params, zygote_fork_delegates.Pass()))
 289     return 1;
 290
 291   if (delegate) delegate->ZygoteForked();
 292
 293   // Zygote::HandleForkRequest may have reallocated the command
 294   // line so update it here with the new version.
 295   const base::CommandLine& command_line =
 296       *base::CommandLine::ForCurrentProcess();
 297   std::string process_type =
 298       command_line.GetSwitchValueASCII(switches::kProcessType);
 299   ContentClientInitializer::Set(process_type, delegate);
 300
 301   MainFunctionParams main_params(command_line);
 302   main_params.zygote_child = true;
 303
 304   for (size_t i = 0; i < arraysize(kMainFunctions); ++i) {
 305     if (process_type == kMainFunctions[i].name)
 306       return kMainFunctions[i].function(main_params);
 307   }
 308
 309   if (delegate)
 310     return delegate->RunProcess(process_type, main_params);
 311
 312   NOTREACHED() << "Unknown zygote process type: " << process_type;
 313   return 1;
 314 }
 315 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 316
 317 #if !defined(OS_IOS)
 318 static void RegisterMainThreadFactories() {
 319 #if !defined(CHROME_MULTIPLE_DLL_BROWSER) && !defined(CHROME_MULTIPLE_DLL_CHILD)
 320   UtilityProcessHostImpl::RegisterUtilityMainThreadFactory(
 321       CreateInProcessUtilityThread);
 322   RenderProcessHostImpl::RegisterRendererMainThreadFactory(
 323       CreateInProcessRendererThread);
 324   GpuProcessHost::RegisterGpuMainThreadFactory(
 325       CreateInProcessGpuThread);
 326 #else
 327   base::CommandLine& command_line = *base::CommandLine::ForCurrentProcess();
 328   if (command_line.HasSwitch(switches::kSingleProcess)) {
 329     LOG(FATAL) <<
 330         "--single-process is not supported in chrome multiple dll browser.";
 331   }
 332   if (command_line.HasSwitch(switches::kInProcessGPU)) {
 333     LOG(FATAL) <<
 334         "--in-process-gpu is not supported in chrome multiple dll browser.";
 335   }
 336 #endif  // !CHROME_MULTIPLE_DLL_BROWSER && !CHROME_MULTIPLE_DLL_CHILD
 337 }
 338
 339 // Run the FooMain() for a given process type.
 340 // If |process_type| is empty, runs BrowserMain().
 341 // Returns the exit code for this process.
 342 int RunNamedProcessTypeMain(
 343     const std::string& process_type,
 344     const MainFunctionParams& main_function_params,
 345     ContentMainDelegate* delegate) {
 346   static const MainFunction kMainFunctions[] = {
 347 #if !defined(CHROME_MULTIPLE_DLL_CHILD)
 348     { "",                            BrowserMain },
 349 #endif
 350 #if !defined(CHROME_MULTIPLE_DLL_BROWSER)
 351 #if defined(ENABLE_PLUGINS)
 352 #if !defined(OS_LINUX)
 353     { switches::kPluginProcess,      PluginMain },
 354 #endif
 355     { switches::kPpapiPluginProcess, PpapiPluginMain },
 356     { switches::kPpapiBrokerProcess, PpapiBrokerMain },
 357 #endif  // ENABLE_PLUGINS
 358     { switches::kUtilityProcess,     UtilityMain },
 359     { switches::kRendererProcess,    RendererMain },
 360     { switches::kGpuProcess,         GpuMain },
 361 #endif  // !CHROME_MULTIPLE_DLL_BROWSER
 362   };
 363
 364   RegisterMainThreadFactories();
 365
 366   for (size_t i = 0; i < arraysize(kMainFunctions); ++i) {
 367     if (process_type == kMainFunctions[i].name) {
 368       if (delegate) {
 369         int exit_code = delegate->RunProcess(process_type,
 370             main_function_params);
 371 #if defined(OS_ANDROID)
 372         // In Android's browser process, the negative exit code doesn't mean the
 373         // default behavior should be used as the UI message loop is managed by
 374         // the Java and the browser process's default behavior is always
 375         // overridden.
 376         if (process_type.empty())
 377           return exit_code;
 378 #endif
 379         if (exit_code >= 0)
 380           return exit_code;
 381       }
 382       return kMainFunctions[i].function(main_function_params);
 383     }
 384   }
 385
 386 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 387   // Zygote startup is special -- see RunZygote comments above
 388   // for why we don't use ZygoteMain directly.
 389   if (process_type == switches::kZygoteProcess)
 390     return RunZygote(main_function_params, delegate);
 391 #endif
 392
 393   // If it's a process we don't know about, the embedder should know.
 394   if (delegate)
 395     return delegate->RunProcess(process_type, main_function_params);
 396
 397   NOTREACHED() << "Unknown process type: " << process_type;
 398   return 1;
 399 }
 400 #endif  // !OS_IOS
 401
 402 class ContentMainRunnerImpl : public ContentMainRunner {
 403  public:
 404   ContentMainRunnerImpl()
 405       : is_initialized_(false),
 406         is_shutdown_(false),
 407         completed_basic_startup_(false),
 408         delegate_(NULL),
 409         ui_task_(NULL) {
 410 #if defined(OS_WIN)
 411     memset(&sandbox_info_, 0, sizeof(sandbox_info_));
 412 #endif
 413   }
 414
 415   ~ContentMainRunnerImpl() override {
 416     if (is_initialized_ && !is_shutdown_)
 417       Shutdown();
 418   }
 419
 420 #if defined(USE_TCMALLOC)
 421   static bool GetAllocatorWasteSizeThunk(size_t* size) {
 422     size_t heap_size, allocated_bytes, unmapped_bytes;
 423     MallocExtension* ext = MallocExtension::instance();
 424     if (ext->GetNumericProperty("generic.heap_size", &heap_size) &&
 425         ext->GetNumericProperty("generic.current_allocated_bytes",
 426                                 &allocated_bytes) &&
 427         ext->GetNumericProperty("tcmalloc.pageheap_unmapped_bytes",
 428                                 &unmapped_bytes)) {
 429       *size = heap_size - allocated_bytes - unmapped_bytes;
 430       return true;
 431     }
 432     DCHECK(false);
 433     return false;
 434   }
 435
 436   static void GetStatsThunk(char* buffer, int buffer_length) {
 437     MallocExtension::instance()->GetStats(buffer, buffer_length);
 438   }
 439
 440   static void ReleaseFreeMemoryThunk() {
 441     MallocExtension::instance()->ReleaseFreeMemory();
 442   }
 443 #endif
 444
 445   int Initialize(const ContentMainParams& params) override {
 446     ui_task_ = params.ui_task;
 447
 448     base::EnableTerminationOnOutOfMemory();
 449 #if defined(OS_WIN)
 450     RegisterInvalidParamHandler();
 451     ui::win::CreateATLModuleIfNeeded();
 452
 453     sandbox_info_ = *params.sandbox_info;
 454 #else  // !OS_WIN
 455
 456 #if defined(OS_ANDROID)
 457     // See note at the initialization of ExitManager, below; basically,
 458     // only Android builds have the ctor/dtor handlers set up to use
 459     // TRACE_EVENT right away.
 460     TRACE_EVENT0("startup", "ContentMainRunnerImpl::Initialize");
 461 #endif  // OS_ANDROID
 462
 463     // NOTE(willchan): One might ask why these TCMalloc-related calls are done
 464     // here rather than in process_util_linux.cc with the definition of
 465     // EnableTerminationOnOutOfMemory().  That's because base shouldn't have a
 466     // dependency on TCMalloc.  Really, we ought to have our allocator shim code
 467     // implement this EnableTerminationOnOutOfMemory() function.  Whateverz.
 468     // This works for now.
 469 #if !defined(OS_MACOSX) && defined(USE_TCMALLOC)
 470
 471 #if defined(TYPE_PROFILING)
 472     base::type_profiler::InterceptFunctions::SetFunctions(
 473         base::type_profiler::NewInterceptForTCMalloc,
 474         base::type_profiler::DeleteInterceptForTCMalloc);
 475 #endif
 476
 477     // For tcmalloc, we need to tell it to behave like new.
 478     tc_set_new_mode(1);
 479
 480     // On windows, we've already set these thunks up in _heap_init()
 481     base::allocator::SetGetAllocatorWasteSizeFunction(
 482         GetAllocatorWasteSizeThunk);
 483     base::allocator::SetGetStatsFunction(GetStatsThunk);
 484     base::allocator::SetReleaseFreeMemoryFunction(ReleaseFreeMemoryThunk);
 485
 486     // Provide optional hook for monitoring allocation quantities on a
 487     // per-thread basis.  Only set the hook if the environment indicates this
 488     // needs to be enabled.
 489     const char* profiling = getenv(tracked_objects::kAlternateProfilerTime);
 490     if (profiling &&
 491         (atoi(profiling) == tracked_objects::TIME_SOURCE_TYPE_TCMALLOC)) {
 492       tracked_objects::SetAlternateTimeSource(
 493           MallocExtension::GetBytesAllocatedOnCurrentThread,
 494           tracked_objects::TIME_SOURCE_TYPE_TCMALLOC);
 495     }
 496 #endif  // !OS_MACOSX && USE_TCMALLOC
 497
 498 #if !defined(OS_IOS)
 499     base::GlobalDescriptors* g_fds = base::GlobalDescriptors::GetInstance();
 500 #endif
 501
 502     // On Android,
 503     // - setlocale() is not supported.
 504     // - We do not override the signal handlers so that we can get
 505     //   stack trace when crashing.
 506     // - The ipc_fd is passed through the Java service.
 507     // Thus, these are all disabled.
 508 #if !defined(OS_ANDROID) && !defined(OS_IOS)
 509     // Set C library locale to make sure CommandLine can parse argument values
 510     // in correct encoding.
 511     setlocale(LC_ALL, "");
 512
 513     SetupSignalHandlers();
 514     g_fds->Set(kPrimaryIPCChannel,
 515                kPrimaryIPCChannel + base::GlobalDescriptors::kBaseDescriptor);
 516 #endif  // !OS_ANDROID && !OS_IOS
 517
 518 #if defined(OS_LINUX) || defined(OS_OPENBSD)
 519     g_fds->Set(kCrashDumpSignal,
 520                kCrashDumpSignal + base::GlobalDescriptors::kBaseDescriptor);
 521 #endif  // OS_LINUX || OS_OPENBSD
 522
 523
 524 #endif  // !OS_WIN
 525
 526     is_initialized_ = true;
 527     delegate_ = params.delegate;
 528
 529     // The exit manager is in charge of calling the dtors of singleton objects.
 530     // On Android, AtExitManager is set up when library is loaded.
 531     // On iOS, it's set up in main(), which can't call directly through to here.
 532     // A consequence of this is that you can't use the ctor/dtor-based
 533     // TRACE_EVENT methods on Linux or iOS builds till after we set this up.
 534 #if !defined(OS_ANDROID) && !defined(OS_IOS)
 535     if (!ui_task_) {
 536       // When running browser tests, don't create a second AtExitManager as that
 537       // interfers with shutdown when objects created before ContentMain is
 538       // called are destructed when it returns.
 539       exit_manager_.reset(new base::AtExitManager);
 540     }
 541 #endif  // !OS_ANDROID && !OS_IOS
 542
 543     // Don't create this loop on iOS, since the outer loop is already handled
 544     // and a loop that's destroyed in shutdown interleaves badly with the event
 545     // loop pool on iOS.
 546 #if defined(OS_MACOSX) && !defined(OS_IOS)
 547     // We need this pool for all the objects created before we get to the
 548     // event loop, but we don't want to leave them hanging around until the
 549     // app quits. Each "main" needs to flush this pool right before it goes into
 550     // its main event loop to get rid of the cruft.
 551     autorelease_pool_.reset(new base::mac::ScopedNSAutoreleasePool());
 552 #endif
 553
 554     // On Android, the command line is initialized when library is loaded and
 555     // we have already started our TRACE_EVENT0.
 556 #if !defined(OS_ANDROID)
 557     // argc/argv are ignored on Windows and Android; see command_line.h for
 558     // details.
 559     int argc = 0;
 560     const char** argv = NULL;
 561
 562 #if !defined(OS_WIN)
 563     argc = params.argc;
 564     argv = params.argv;
 565 #endif
 566
 567     base::CommandLine::Init(argc, argv);
 568
 569     if (!delegate_ || delegate_->ShouldEnableTerminationOnHeapCorruption())
 570       base::EnableTerminationOnHeapCorruption();
 571
 572 #if !defined(OS_IOS)
 573     SetProcessTitleFromCommandLine(argv);
 574 #endif
 575 #endif // !OS_ANDROID
 576
 577     int exit_code = 0;
 578     if (delegate_ && delegate_->BasicStartupComplete(&exit_code))
 579       return exit_code;
 580
 581     completed_basic_startup_ = true;
 582
 583     const base::CommandLine& command_line =
 584         *base::CommandLine::ForCurrentProcess();
 585     std::string process_type =
 586         command_line.GetSwitchValueASCII(switches::kProcessType);
 587
 588 #if !defined(OS_IOS)
 589     // Initialize mojo here so that services can be registered.
 590     InitializeMojo();
 591 #endif
 592
 593 #if defined(OS_WIN)
 594     bool init_device_scale_factor = true;
 595     if (command_line.HasSwitch(switches::kDeviceScaleFactor)) {
 596       std::string scale_factor_string = command_line.GetSwitchValueASCII(
 597           switches::kDeviceScaleFactor);
 598       double scale_factor = 0;
 599       if (base::StringToDouble(scale_factor_string, &scale_factor)) {
 600         init_device_scale_factor = false;
 601         gfx::InitDeviceScaleFactor(scale_factor);
 602       }
 603     }
 604     if (init_device_scale_factor)
 605       gfx::InitDeviceScaleFactor(gfx::GetDPIScale());
 606 #endif
 607
 608     if (!GetContentClient())
 609       SetContentClient(&empty_content_client_);
 610     ContentClientInitializer::Set(process_type, delegate_);
 611
 612 #if defined(OS_WIN)
 613     // Route stdio to parent console (if any) or create one.
 614     if (command_line.HasSwitch(switches::kEnableLogging))
 615       base::RouteStdioToConsole();
 616 #endif
 617
 618     // Enable startup tracing asap to avoid early TRACE_EVENT calls being
 619     // ignored.
 620     if (command_line.HasSwitch(switches::kTraceStartup)) {
 621       base::trace_event::CategoryFilter category_filter(
 622           command_line.GetSwitchValueASCII(switches::kTraceStartup));
 623       base::trace_event::TraceLog::GetInstance()->SetEnabled(
 624           category_filter,
 625           base::trace_event::TraceLog::RECORDING_MODE,
 626           base::trace_event::TraceOptions(
 627               base::trace_event::RECORD_UNTIL_FULL));
 628     }
 629 #if !defined(OS_ANDROID)
 630     // Android tracing started at the beginning of the method.
 631     // Other OSes have to wait till we get here in order for all the memory
 632     // management setup to be completed.
 633     TRACE_EVENT0("startup", "ContentMainRunnerImpl::Initialize");
 634 #endif // !OS_ANDROID
 635
 636 #if defined(OS_MACOSX) && !defined(OS_IOS)
 637     // We need to allocate the IO Ports before the Sandbox is initialized or
 638     // the first instance of PowerMonitor is created.
 639     // It's important not to allocate the ports for processes which don't
 640     // register with the power monitor - see crbug.com/88867.
 641     if (process_type.empty() ||
 642         (delegate_ &&
 643          delegate_->ProcessRegistersWithSystemProcess(process_type))) {
 644       base::PowerMonitorDeviceSource::AllocateSystemIOPorts();
 645     }
 646
 647     if (!process_type.empty() &&
 648         (!delegate_ || delegate_->ShouldSendMachPort(process_type))) {
 649       MachBroker::ChildSendTaskPortToParent();
 650     }
 651 #elif defined(OS_WIN)
 652     SetupCRT(command_line);
 653 #endif
 654
 655 #if defined(OS_POSIX)
 656     if (!process_type.empty()) {
 657       // When you hit Ctrl-C in a terminal running the browser
 658       // process, a SIGINT is delivered to the entire process group.
 659       // When debugging the browser process via gdb, gdb catches the
 660       // SIGINT for the browser process (and dumps you back to the gdb
 661       // console) but doesn't for the child processes, killing them.
 662       // The fix is to have child processes ignore SIGINT; they'll die
 663       // on their own when the browser process goes away.
 664       //
 665       // Note that we *can't* rely on BeingDebugged to catch this case because
 666       // we are the child process, which is not being debugged.
 667       // TODO(evanm): move this to some shared subprocess-init function.
 668       if (!base::debug::BeingDebugged())
 669         signal(SIGINT, SIG_IGN);
 670     }
 671 #endif
 672
 673 #if defined(USE_NSS)
 674     crypto::EarlySetupForNSSInit();
 675 #endif
 676
 677     ui::RegisterPathProvider();
 678     RegisterPathProvider();
 679     RegisterContentSchemes(true);
 680
 681 #if defined(OS_ANDROID)
 682     int icudata_fd = g_fds->MaybeGet(kAndroidICUDataDescriptor);
 683     if (icudata_fd != -1) {
 684       auto icudata_region = g_fds->GetRegion(kAndroidICUDataDescriptor);
 685       CHECK(base::i18n::InitializeICUWithFileDescriptor(icudata_fd,
 686                                                         icudata_region));
 687     } else {
 688       CHECK(base::i18n::InitializeICU());
 689     }
 690 #else
 691     CHECK(base::i18n::InitializeICU());
 692 #endif  // OS_ANDROID
 693
 694 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
 695 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 696 #if !defined(OS_ANDROID)
 697     // kV8NativesDataDescriptor and kV8SnapshotDataDescriptor are shared with
 698     // child processes. On Android they are set in
 699     // ChildProcessService::InternalInitChildProcess, otherwise set them here.
 700     if (!process_type.empty() && process_type != switches::kZygoteProcess) {
 701       g_fds->Set(
 702           kV8NativesDataDescriptor,
 703           kV8NativesDataDescriptor + base::GlobalDescriptors::kBaseDescriptor);
 704       g_fds->Set(
 705           kV8SnapshotDataDescriptor,
 706           kV8SnapshotDataDescriptor + base::GlobalDescriptors::kBaseDescriptor);
 707     }
 708 #endif  // !OS_ANDROID
 709     int v8_natives_fd = g_fds->MaybeGet(kV8NativesDataDescriptor);
 710     int v8_snapshot_fd = g_fds->MaybeGet(kV8SnapshotDataDescriptor);
 711     if (v8_natives_fd != -1 && v8_snapshot_fd != -1) {
 712       auto v8_natives_region = g_fds->GetRegion(kV8NativesDataDescriptor);
 713       auto v8_snapshot_region = g_fds->GetRegion(kV8SnapshotDataDescriptor);
 714       CHECK(gin::IsolateHolder::LoadV8SnapshotFd(
 715           v8_natives_fd, v8_natives_region.offset, v8_natives_region.size,
 716           v8_snapshot_fd, v8_snapshot_region.offset, v8_snapshot_region.size));
 717     } else {
 718       CHECK(gin::IsolateHolder::LoadV8Snapshot());
 719     }
 720 #else
 721     CHECK(gin::IsolateHolder::LoadV8Snapshot());
 722 #endif  // OS_POSIX && !OS_MACOSX
 723 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 724
 725     if (delegate_)
 726       delegate_->PreSandboxStartup();
 727
 728     if (!process_type.empty())
 729       CommonSubprocessInit(process_type);
 730
 731 #if defined(OS_WIN)
 732     CHECK(InitializeSandbox(params.sandbox_info));
 733 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 734     if (process_type == switches::kRendererProcess ||
 735         process_type == switches::kPpapiPluginProcess ||
 736         (delegate_ && delegate_->DelaySandboxInitialization(process_type))) {
 737       // On OS X the renderer sandbox needs to be initialized later in the
 738       // startup sequence in RendererMainPlatformDelegate::EnableSandbox().
 739     } else {
 740       CHECK(InitializeSandbox());
 741     }
 742 #endif
 743
 744     if (delegate_)
 745       delegate_->SandboxInitialized(process_type);
 746
 747     // Return -1 to indicate no early termination.
 748     return -1;
 749   }
 750
 751   int Run() override {
 752     DCHECK(is_initialized_);
 753     DCHECK(!is_shutdown_);
 754     const base::CommandLine& command_line =
 755         *base::CommandLine::ForCurrentProcess();
 756     std::string process_type =
 757         command_line.GetSwitchValueASCII(switches::kProcessType);
 758
 759     MainFunctionParams main_params(command_line);
 760     main_params.ui_task = ui_task_;
 761 #if defined(OS_WIN)
 762     main_params.sandbox_info = &sandbox_info_;
 763 #elif defined(OS_MACOSX)
 764     main_params.autorelease_pool = autorelease_pool_.get();
 765 #endif
 766
 767 #if !defined(OS_IOS)
 768     return RunNamedProcessTypeMain(process_type, main_params, delegate_);
 769 #else
 770     return 1;
 771 #endif
 772   }
 773
 774   void Shutdown() override {
 775     DCHECK(is_initialized_);
 776     DCHECK(!is_shutdown_);
 777
 778     if (completed_basic_startup_ && delegate_) {
 779       const base::CommandLine& command_line =
 780           *base::CommandLine::ForCurrentProcess();
 781       std::string process_type =
 782           command_line.GetSwitchValueASCII(switches::kProcessType);
 783
 784       delegate_->ProcessExiting(process_type);
 785     }
 786
 787 #if defined(OS_WIN)
 788 #ifdef _CRTDBG_MAP_ALLOC
 789     _CrtDumpMemoryLeaks();
 790 #endif  // _CRTDBG_MAP_ALLOC
 791 #endif  // OS_WIN
 792
 793 #if defined(OS_MACOSX) && !defined(OS_IOS)
 794     autorelease_pool_.reset(NULL);
 795 #endif
 796
 797     exit_manager_.reset(NULL);
 798
 799     delegate_ = NULL;
 800     is_shutdown_ = true;
 801   }
 802
 803  private:
 804   // True if the runner has been initialized.
 805   bool is_initialized_;
 806
 807   // True if the runner has been shut down.
 808   bool is_shutdown_;
 809
 810   // True if basic startup was completed.
 811   bool completed_basic_startup_;
 812
 813   // Used if the embedder doesn't set one.
 814   ContentClient empty_content_client_;
 815
 816   // The delegate will outlive this object.
 817   ContentMainDelegate* delegate_;
 818
 819   scoped_ptr<base::AtExitManager> exit_manager_;
 820 #if defined(OS_WIN)
 821   sandbox::SandboxInterfaceInfo sandbox_info_;
 822 #elif defined(OS_MACOSX)
 823   scoped_ptr<base::mac::ScopedNSAutoreleasePool> autorelease_pool_;
 824 #endif
 825
 826   base::Closure* ui_task_;
 827
 828   DISALLOW_COPY_AND_ASSIGN(ContentMainRunnerImpl);
 829 };
 830
 831 // static
 832 ContentMainRunner* ContentMainRunner::Create() {
 833   return new ContentMainRunnerImpl();
 834 }
 835
 836 }  // namespace content