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      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/debug/trace_event.h"
     14 #include "base/files/file_path.h"
     15 #include "base/i18n/icu_util.h"
     16 #include "base/lazy_instance.h"
     17 #include "base/logging.h"
     18 #include "base/memory/scoped_ptr.h"
     19 #include "base/metrics/stats_table.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/strings/string_number_conversions.h"
     26 #include "base/strings/string_util.h"
     27 #include "base/strings/stringprintf.h"
     28 #include "content/browser/browser_main.h"
     29 #include "content/browser/gpu/gpu_process_host.h"
     30 #include "content/common/set_process_title.h"
     31 #include "content/common/url_schemes.h"
     32 #include "content/gpu/in_process_gpu_thread.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/browser/render_process_host.h"
     37 #include "content/public/browser/utility_process_host.h"
     38 #include "content/public/common/content_client.h"
     39 #include "content/public/common/content_constants.h"
     40 #include "content/public/common/content_paths.h"
     41 #include "content/public/common/content_switches.h"
     42 #include "content/public/common/main_function_params.h"
     43 #include "content/public/common/sandbox_init.h"
     44 #include "content/renderer/in_process_renderer_thread.h"
     45 #include "content/utility/in_process_utility_thread.h"
     46 #include "crypto/nss_util.h"
     47 #include "ipc/ipc_switches.h"
     48 #include "media/base/media.h"
     49 #include "sandbox/win/src/sandbox_types.h"
     50 #include "ui/base/ui_base_paths.h"
     51 #include "ui/base/ui_base_switches.h"
     52 #include "ui/gfx/win/dpi.h"
     53 #include "webkit/common/user_agent/user_agent.h"
     54 
     55 #if defined(USE_TCMALLOC)
     56 #include "third_party/tcmalloc/chromium/src/gperftools/malloc_extension.h"
     57 #if defined(TYPE_PROFILING)
     58 #include "base/allocator/type_profiler.h"
     59 #include "base/allocator/type_profiler_tcmalloc.h"
     60 #endif
     61 #endif
     62 
     63 #if !defined(OS_IOS)
     64 #include "content/public/plugin/content_plugin_client.h"
     65 #include "content/public/renderer/content_renderer_client.h"
     66 #include "content/public/utility/content_utility_client.h"
     67 #endif
     68 
     69 #if defined(OS_WIN)
     70 #include <atlbase.h>
     71 #include <atlapp.h>
     72 #include <malloc.h>
     73 #include <cstring>
     74 #elif defined(OS_MACOSX)
     75 #include "base/mac/scoped_nsautorelease_pool.h"
     76 #if !defined(OS_IOS)
     77 #include "base/power_monitor/power_monitor_device_source.h"
     78 #include "content/browser/mach_broker_mac.h"
     79 #include "content/common/sandbox_init_mac.h"
     80 #endif  // !OS_IOS
     81 #endif  // OS_WIN
     82 
     83 #if defined(OS_POSIX)
     84 #include <signal.h>
     85 
     86 #include "base/posix/global_descriptors.h"
     87 #include "content/public/common/content_descriptors.h"
     88 
     89 #if !defined(OS_MACOSX)
     90 #include "content/public/common/zygote_fork_delegate_linux.h"
     91 #endif
     92 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
     93 #include "content/zygote/zygote_main.h"
     94 #endif
     95 
     96 #endif  // OS_POSIX
     97 
     98 #if !defined(OS_MACOSX) && defined(USE_TCMALLOC)
     99 extern "C" {
    100 int tc_set_new_mode(int mode);
    101 }
    102 #endif
    103 
    104 namespace content {
    105 extern int GpuMain(const content::MainFunctionParams&);
    106 #if defined(ENABLE_PLUGINS)
    107 extern int PluginMain(const content::MainFunctionParams&);
    108 extern int PpapiPluginMain(const MainFunctionParams&);
    109 extern int PpapiBrokerMain(const MainFunctionParams&);
    110 #endif
    111 extern int RendererMain(const content::MainFunctionParams&);
    112 extern int UtilityMain(const MainFunctionParams&);
    113 extern int WorkerMain(const MainFunctionParams&);
    114 }  // namespace content
    115 
    116 namespace {
    117 #if defined(OS_WIN)
    118 // In order to have Theme support, we need to connect to the theme service.
    119 // This needs to be done before we lock down the process. Officially this
    120 // can be done with OpenThemeData() but it fails unless you pass a valid
    121 // window at least the first time. Interestingly, the very act of creating a
    122 // window also sets the connection to the theme service.
    123 void EnableThemeSupportOnAllWindowStations() {
    124   HDESK desktop_handle = ::OpenInputDesktop(0, FALSE, READ_CONTROL);
    125   if (desktop_handle) {
    126     // This means we are running in an input desktop, which implies WinSta0.
    127     ::CloseDesktop(desktop_handle);
    128     return;
    129   }
    130 
    131   HWINSTA current_station = ::GetProcessWindowStation();
    132   DCHECK(current_station);
    133 
    134   HWINSTA winsta0 = ::OpenWindowStationA("WinSta0", FALSE, GENERIC_READ);
    135   if (!winsta0) {
    136     DVLOG(0) << "Unable to open to WinSta0, we: "<< ::GetLastError();
    137     return;
    138   }
    139   if (!::SetProcessWindowStation(winsta0)) {
    140     // Could not set the alternate window station. There is a possibility
    141     // that the theme wont be correctly initialized.
    142     NOTREACHED() << "Unable to switch to WinSta0, we: "<< ::GetLastError();
    143     ::CloseWindowStation(winsta0);
    144     return;
    145   }
    146 
    147   HWND window = ::CreateWindowExW(0, L"Static", L"", WS_POPUP | WS_DISABLED,
    148                                   CW_USEDEFAULT, 0, 0, 0,  HWND_MESSAGE, NULL,
    149                                   ::GetModuleHandleA(NULL), NULL);
    150   if (!window) {
    151     DLOG(WARNING) << "failed to enable theme support";
    152   } else {
    153     ::DestroyWindow(window);
    154     window = NULL;
    155   }
    156 
    157   // Revert the window station.
    158   if (!::SetProcessWindowStation(current_station)) {
    159     // We failed to switch back to the secure window station. This might
    160     // confuse the process enough that we should kill it now.
    161     LOG(FATAL) << "Failed to restore alternate window station";
    162   }
    163 
    164   if (!::CloseWindowStation(winsta0)) {
    165     // We might be leaking a winsta0 handle.  This is a security risk, but
    166     // since we allow fail over to no desktop protection in low memory
    167     // condition, this is not a big risk.
    168     NOTREACHED();
    169   }
    170 }
    171 #endif  // defined(OS_WIN)
    172 }  // namespace
    173 
    174 namespace content {
    175 
    176 base::LazyInstance<ContentBrowserClient>
    177     g_empty_content_browser_client = LAZY_INSTANCE_INITIALIZER;
    178 #if !defined(OS_IOS) && !defined(CHROME_MULTIPLE_DLL_BROWSER)
    179 base::LazyInstance<ContentPluginClient>
    180     g_empty_content_plugin_client = LAZY_INSTANCE_INITIALIZER;
    181 base::LazyInstance<ContentRendererClient>
    182     g_empty_content_renderer_client = LAZY_INSTANCE_INITIALIZER;
    183 base::LazyInstance<ContentUtilityClient>
    184     g_empty_content_utility_client = LAZY_INSTANCE_INITIALIZER;
    185 #endif  // !OS_IOS && !CHROME_MULTIPLE_DLL_BROWSER
    186 
    187 #if defined(OS_WIN)
    188 
    189 static CAppModule _Module;
    190 
    191 #endif  // defined(OS_WIN)
    192 
    193 #if defined(OS_POSIX) && !defined(OS_IOS)
    194 
    195 // Setup signal-handling state: resanitize most signals, ignore SIGPIPE.
    196 void SetupSignalHandlers() {
    197   // Sanitise our signal handling state. Signals that were ignored by our
    198   // parent will also be ignored by us. We also inherit our parent's sigmask.
    199   sigset_t empty_signal_set;
    200   CHECK(0 == sigemptyset(&empty_signal_set));
    201   CHECK(0 == sigprocmask(SIG_SETMASK, &empty_signal_set, NULL));
    202 
    203   struct sigaction sigact;
    204   memset(&sigact, 0, sizeof(sigact));
    205   sigact.sa_handler = SIG_DFL;
    206   static const int signals_to_reset[] =
    207       {SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGABRT, SIGFPE, SIGSEGV,
    208        SIGALRM, SIGTERM, SIGCHLD, SIGBUS, SIGTRAP};  // SIGPIPE is set below.
    209   for (unsigned i = 0; i < arraysize(signals_to_reset); i++) {
    210     CHECK(0 == sigaction(signals_to_reset[i], &sigact, NULL));
    211   }
    212 
    213   // Always ignore SIGPIPE.  We check the return value of write().
    214   CHECK(signal(SIGPIPE, SIG_IGN) != SIG_ERR);
    215 }
    216 
    217 #endif  // OS_POSIX && !OS_IOS
    218 
    219 void CommonSubprocessInit(const std::string& process_type) {
    220 #if defined(OS_WIN)
    221   // HACK: Let Windows know that we have started.  This is needed to suppress
    222   // the IDC_APPSTARTING cursor from being displayed for a prolonged period
    223   // while a subprocess is starting.
    224   PostThreadMessage(GetCurrentThreadId(), WM_NULL, 0, 0);
    225   MSG msg;
    226   PeekMessage(&msg, NULL, 0, 0, PM_REMOVE);
    227 #endif
    228 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
    229   // Various things break when you're using a locale where the decimal
    230   // separator isn't a period.  See e.g. bugs 22782 and 39964.  For
    231   // all processes except the browser process (where we call system
    232   // APIs that may rely on the correct locale for formatting numbers
    233   // when presenting them to the user), reset the locale for numeric
    234   // formatting.
    235   // Note that this is not correct for plugin processes -- they can
    236   // surface UI -- but it's likely they get this wrong too so why not.
    237   setlocale(LC_NUMERIC, "C");
    238 #endif
    239 }
    240 
    241 static base::ProcessId GetBrowserPid(const CommandLine& command_line) {
    242   base::ProcessId browser_pid = base::GetCurrentProcId();
    243 #if !defined(OS_IOS)
    244   if (command_line.HasSwitch(switches::kProcessChannelID)) {
    245 #if defined(OS_WIN) || defined(OS_MACOSX)
    246     std::string channel_name =
    247         command_line.GetSwitchValueASCII(switches::kProcessChannelID);
    248 
    249     int browser_pid_int;
    250     base::StringToInt(channel_name, &browser_pid_int);
    251     browser_pid = static_cast<base::ProcessId>(browser_pid_int);
    252     DCHECK_NE(browser_pid_int, 0);
    253 #elif defined(OS_ANDROID)
    254     // On Android, the browser process isn't the parent. A bunch
    255     // of work will be required before callers of this routine will
    256     // get what they want.
    257     //
    258     // Note: On Linux, base::GetParentProcessId() is defined in
    259     // process_util_linux.cc. Note that *_linux.cc is excluded from
    260     // Android builds but a special exception is made in base.gypi
    261     // for a few files including process_util_linux.cc.
    262     LOG(ERROR) << "GetBrowserPid() not implemented for Android().";
    263 #elif defined(OS_POSIX)
    264     // On linux, we're in a process forked from the zygote here; so we need the
    265     // parent's parent process' id.
    266     browser_pid =
    267         base::GetParentProcessId(
    268             base::GetParentProcessId(base::GetCurrentProcId()));
    269 #endif
    270   }
    271 #endif  // !OS_IOS
    272   return browser_pid;
    273 }
    274 
    275 static void InitializeStatsTable(const CommandLine& command_line) {
    276   // Initialize the Stats Counters table.  With this initialized,
    277   // the StatsViewer can be utilized to read counters outside of
    278   // Chrome.  These lines can be commented out to effectively turn
    279   // counters 'off'.  The table is created and exists for the life
    280   // of the process.  It is not cleaned up.
    281   if (command_line.HasSwitch(switches::kEnableStatsTable)) {
    282     // NOTIMPLEMENTED: we probably need to shut this down correctly to avoid
    283     // leaking shared memory regions on posix platforms.
    284     std::string statsfile =
    285       base::StringPrintf("%s-%u", kStatsFilename,
    286           static_cast<unsigned int>(GetBrowserPid(command_line)));
    287     base::StatsTable* stats_table = new base::StatsTable(statsfile,
    288         kStatsMaxThreads, kStatsMaxCounters);
    289     base::StatsTable::set_current(stats_table);
    290   }
    291 }
    292 
    293 class ContentClientInitializer {
    294  public:
    295   static void Set(const std::string& process_type,
    296                   ContentMainDelegate* delegate) {
    297     ContentClient* content_client = GetContentClient();
    298     if (process_type.empty()) {
    299       if (delegate)
    300         content_client->browser_ = delegate->CreateContentBrowserClient();
    301       if (!content_client->browser_)
    302         content_client->browser_ = &g_empty_content_browser_client.Get();
    303     }
    304 
    305 #if !defined(OS_IOS) && !defined(CHROME_MULTIPLE_DLL_BROWSER)
    306     if (process_type == switches::kPluginProcess ||
    307         process_type == switches::kPpapiPluginProcess) {
    308       if (delegate)
    309         content_client->plugin_ = delegate->CreateContentPluginClient();
    310       if (!content_client->plugin_)
    311         content_client->plugin_ = &g_empty_content_plugin_client.Get();
    312       // Single process not supported in split dll mode.
    313     } else if (process_type == switches::kRendererProcess ||
    314                CommandLine::ForCurrentProcess()->HasSwitch(
    315                    switches::kSingleProcess)) {
    316       if (delegate)
    317         content_client->renderer_ = delegate->CreateContentRendererClient();
    318       if (!content_client->renderer_)
    319         content_client->renderer_ = &g_empty_content_renderer_client.Get();
    320     }
    321 
    322     if (process_type == switches::kUtilityProcess ||
    323         CommandLine::ForCurrentProcess()->HasSwitch(
    324             switches::kSingleProcess)) {
    325       if (delegate)
    326         content_client->utility_ = delegate->CreateContentUtilityClient();
    327       // TODO(scottmg): http://crbug.com/237249 Should be in _child.
    328       if (!content_client->utility_)
    329         content_client->utility_ = &g_empty_content_utility_client.Get();
    330     }
    331 #endif  // !OS_IOS && !CHROME_MULTIPLE_DLL_BROWSER
    332   }
    333 };
    334 
    335 // We dispatch to a process-type-specific FooMain() based on a command-line
    336 // flag.  This struct is used to build a table of (flag, main function) pairs.
    337 struct MainFunction {
    338   const char* name;
    339   int (*function)(const MainFunctionParams&);
    340 };
    341 
    342 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
    343 // On platforms that use the zygote, we have a special subset of
    344 // subprocesses that are launched via the zygote.  This function
    345 // fills in some process-launching bits around ZygoteMain().
    346 // Returns the exit code of the subprocess.
    347 int RunZygote(const MainFunctionParams& main_function_params,
    348               ContentMainDelegate* delegate) {
    349   static const MainFunction kMainFunctions[] = {
    350     { switches::kRendererProcess,    RendererMain },
    351     { switches::kWorkerProcess,      WorkerMain },
    352 #if defined(ENABLE_PLUGINS)
    353     { switches::kPpapiPluginProcess, PpapiPluginMain },
    354 #endif
    355     { switches::kUtilityProcess,     UtilityMain },
    356   };
    357 
    358   scoped_ptr<ZygoteForkDelegate> zygote_fork_delegate;
    359   if (delegate) {
    360     zygote_fork_delegate.reset(delegate->ZygoteStarting());
    361     // Each Renderer we spawn will re-attempt initialization of the media
    362     // libraries, at which point failure will be detected and handled, so
    363     // we do not need to cope with initialization failures here.
    364     base::FilePath media_path;
    365     if (PathService::Get(DIR_MEDIA_LIBS, &media_path))
    366       media::InitializeMediaLibrary(media_path);
    367   }
    368 
    369   // This function call can return multiple times, once per fork().
    370   if (!ZygoteMain(main_function_params, zygote_fork_delegate.get()))
    371     return 1;
    372 
    373   if (delegate) delegate->ZygoteForked();
    374 
    375   // Zygote::HandleForkRequest may have reallocated the command
    376   // line so update it here with the new version.
    377   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
    378   std::string process_type =
    379       command_line.GetSwitchValueASCII(switches::kProcessType);
    380   ContentClientInitializer::Set(process_type, delegate);
    381 
    382   // If a custom user agent was passed on the command line, we need
    383   // to (re)set it now, rather than using the default one the zygote
    384   // initialized.
    385   if (command_line.HasSwitch(switches::kUserAgent)) {
    386     webkit_glue::SetUserAgent(
    387         command_line.GetSwitchValueASCII(switches::kUserAgent), true);
    388   }
    389 
    390   // The StatsTable must be initialized in each process; we already
    391   // initialized for the browser process, now we need to initialize
    392   // within the new processes as well.
    393   InitializeStatsTable(command_line);
    394 
    395   MainFunctionParams main_params(command_line);
    396 
    397   for (size_t i = 0; i < arraysize(kMainFunctions); ++i) {
    398     if (process_type == kMainFunctions[i].name)
    399       return kMainFunctions[i].function(main_params);
    400   }
    401 
    402   if (delegate)
    403     return delegate->RunProcess(process_type, main_params);
    404 
    405   NOTREACHED() << "Unknown zygote process type: " << process_type;
    406   return 1;
    407 }
    408 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
    409 
    410 #if !defined(OS_IOS)
    411 static void RegisterMainThreadFactories() {
    412 #if !defined(CHROME_MULTIPLE_DLL_BROWSER)
    413   UtilityProcessHost::RegisterUtilityMainThreadFactory(
    414       CreateInProcessUtilityThread);
    415   RenderProcessHost::RegisterRendererMainThreadFactory(
    416       CreateInProcessRendererThread);
    417   GpuProcessHost::RegisterGpuMainThreadFactory(
    418       CreateInProcessGpuThread);
    419 #else
    420   CommandLine& command_line = *CommandLine::ForCurrentProcess();
    421   if (command_line.HasSwitch(switches::kSingleProcess)) {
    422     LOG(FATAL) <<
    423         "--single-process is not supported in chrome multiple dll browser.";
    424   }
    425   if (command_line.HasSwitch(switches::kInProcessGPU)) {
    426     LOG(FATAL) <<
    427         "--in-process-gpu is not supported in chrome multiple dll browser.";
    428   }
    429 #endif
    430 }
    431 
    432 // Run the FooMain() for a given process type.
    433 // If |process_type| is empty, runs BrowserMain().
    434 // Returns the exit code for this process.
    435 int RunNamedProcessTypeMain(
    436     const std::string& process_type,
    437     const MainFunctionParams& main_function_params,
    438     ContentMainDelegate* delegate) {
    439   static const MainFunction kMainFunctions[] = {
    440 #if !defined(CHROME_MULTIPLE_DLL_CHILD)
    441     { "",                            BrowserMain },
    442 #endif
    443 #if !defined(CHROME_MULTIPLE_DLL_BROWSER)
    444 #if defined(ENABLE_PLUGINS)
    445     { switches::kPluginProcess,      PluginMain },
    446     { switches::kWorkerProcess,      WorkerMain },
    447     { switches::kPpapiPluginProcess, PpapiPluginMain },
    448     { switches::kPpapiBrokerProcess, PpapiBrokerMain },
    449 #endif  // ENABLE_PLUGINS
    450     { switches::kUtilityProcess,     UtilityMain },
    451     { switches::kRendererProcess,    RendererMain },
    452     { switches::kGpuProcess,         GpuMain },
    453 #endif  // !CHROME_MULTIPLE_DLL_BROWSER
    454   };
    455 
    456   RegisterMainThreadFactories();
    457 
    458   for (size_t i = 0; i < arraysize(kMainFunctions); ++i) {
    459     if (process_type == kMainFunctions[i].name) {
    460       if (delegate) {
    461         int exit_code = delegate->RunProcess(process_type,
    462             main_function_params);
    463 #if defined(OS_ANDROID)
    464         // In Android's browser process, the negative exit code doesn't mean the
    465         // default behavior should be used as the UI message loop is managed by
    466         // the Java and the browser process's default behavior is always
    467         // overridden.
    468         if (process_type.empty())
    469           return exit_code;
    470 #endif
    471         if (exit_code >= 0)
    472           return exit_code;
    473       }
    474       return kMainFunctions[i].function(main_function_params);
    475     }
    476   }
    477 
    478 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
    479   // Zygote startup is special -- see RunZygote comments above
    480   // for why we don't use ZygoteMain directly.
    481   if (process_type == switches::kZygoteProcess)
    482     return RunZygote(main_function_params, delegate);
    483 #endif
    484 
    485   // If it's a process we don't know about, the embedder should know.
    486   if (delegate)
    487     return delegate->RunProcess(process_type, main_function_params);
    488 
    489   NOTREACHED() << "Unknown process type: " << process_type;
    490   return 1;
    491 }
    492 #endif  // !OS_IOS
    493 
    494 class ContentMainRunnerImpl : public ContentMainRunner {
    495  public:
    496   ContentMainRunnerImpl()
    497       : is_initialized_(false),
    498         is_shutdown_(false),
    499         completed_basic_startup_(false),
    500         delegate_(NULL) {
    501 #if defined(OS_WIN)
    502     memset(&sandbox_info_, 0, sizeof(sandbox_info_));
    503 #endif
    504   }
    505 
    506   virtual ~ContentMainRunnerImpl() {
    507     if (is_initialized_ && !is_shutdown_)
    508       Shutdown();
    509   }
    510 
    511 #if defined(USE_TCMALLOC)
    512   static bool GetAllocatorWasteSizeThunk(size_t* size) {
    513     size_t heap_size, allocated_bytes, unmapped_bytes;
    514     MallocExtension* ext = MallocExtension::instance();
    515     if (ext->GetNumericProperty("generic.heap_size", &heap_size) &&
    516         ext->GetNumericProperty("generic.current_allocated_bytes",
    517                                 &allocated_bytes) &&
    518         ext->GetNumericProperty("tcmalloc.pageheap_unmapped_bytes",
    519                                 &unmapped_bytes)) {
    520       *size = heap_size - allocated_bytes - unmapped_bytes;
    521       return true;
    522     }
    523     DCHECK(false);
    524     return false;
    525   }
    526 
    527   static void GetStatsThunk(char* buffer, int buffer_length) {
    528     MallocExtension::instance()->GetStats(buffer, buffer_length);
    529   }
    530 
    531   static void ReleaseFreeMemoryThunk() {
    532     MallocExtension::instance()->ReleaseFreeMemory();
    533   }
    534 #endif
    535 
    536 #if defined(OS_WIN)
    537   virtual int Initialize(HINSTANCE instance,
    538                          sandbox::SandboxInterfaceInfo* sandbox_info,
    539                          ContentMainDelegate* delegate) OVERRIDE {
    540     // argc/argv are ignored on Windows; see command_line.h for details.
    541     int argc = 0;
    542     char** argv = NULL;
    543 
    544     RegisterInvalidParamHandler();
    545     _Module.Init(NULL, static_cast<HINSTANCE>(instance));
    546 
    547     sandbox_info_ = *sandbox_info;
    548 #else  // !OS_WIN
    549   virtual int Initialize(int argc,
    550                          const char** argv,
    551                          ContentMainDelegate* delegate) OVERRIDE {
    552 
    553 #if defined(OS_ANDROID)
    554     // See note at the initialization of ExitManager, below; basically,
    555     // only Android builds have the ctor/dtor handlers set up to use
    556     // TRACE_EVENT right away.
    557     TRACE_EVENT0("startup", "ContentMainRunnerImpl::Initialize");
    558 #endif  // OS_ANDROID
    559 
    560     // NOTE(willchan): One might ask why these TCMalloc-related calls are done
    561     // here rather than in process_util_linux.cc with the definition of
    562     // EnableTerminationOnOutOfMemory().  That's because base shouldn't have a
    563     // dependency on TCMalloc.  Really, we ought to have our allocator shim code
    564     // implement this EnableTerminationOnOutOfMemory() function.  Whateverz.
    565     // This works for now.
    566 #if !defined(OS_MACOSX) && defined(USE_TCMALLOC)
    567 
    568 #if defined(TYPE_PROFILING)
    569     base::type_profiler::InterceptFunctions::SetFunctions(
    570         base::type_profiler::NewInterceptForTCMalloc,
    571         base::type_profiler::DeleteInterceptForTCMalloc);
    572 #endif
    573 
    574     // For tcmalloc, we need to tell it to behave like new.
    575     tc_set_new_mode(1);
    576 
    577     // On windows, we've already set these thunks up in _heap_init()
    578     base::allocator::SetGetAllocatorWasteSizeFunction(
    579         GetAllocatorWasteSizeThunk);
    580     base::allocator::SetGetStatsFunction(GetStatsThunk);
    581     base::allocator::SetReleaseFreeMemoryFunction(ReleaseFreeMemoryThunk);
    582 
    583     // Provide optional hook for monitoring allocation quantities on a
    584     // per-thread basis.  Only set the hook if the environment indicates this
    585     // needs to be enabled.
    586     const char* profiling = getenv(tracked_objects::kAlternateProfilerTime);
    587     if (profiling &&
    588         (atoi(profiling) == tracked_objects::TIME_SOURCE_TYPE_TCMALLOC)) {
    589       tracked_objects::SetAlternateTimeSource(
    590           MallocExtension::GetBytesAllocatedOnCurrentThread,
    591           tracked_objects::TIME_SOURCE_TYPE_TCMALLOC);
    592     }
    593 #endif
    594 
    595     // On Android,
    596     // - setlocale() is not supported.
    597     // - We do not override the signal handlers so that we can get
    598     //   stack trace when crashing.
    599     // - The ipc_fd is passed through the Java service.
    600     // Thus, these are all disabled.
    601 #if !defined(OS_ANDROID) && !defined(OS_IOS)
    602     // Set C library locale to make sure CommandLine can parse argument values
    603     // in correct encoding.
    604     setlocale(LC_ALL, "");
    605 
    606     SetupSignalHandlers();
    607 
    608     base::GlobalDescriptors* g_fds = base::GlobalDescriptors::GetInstance();
    609     g_fds->Set(kPrimaryIPCChannel,
    610                kPrimaryIPCChannel + base::GlobalDescriptors::kBaseDescriptor);
    611 #endif  // !OS_ANDROID && !OS_IOS
    612 
    613 #if defined(OS_LINUX) || defined(OS_OPENBSD)
    614     g_fds->Set(kCrashDumpSignal,
    615                kCrashDumpSignal + base::GlobalDescriptors::kBaseDescriptor);
    616 #endif
    617 
    618 #endif  // !OS_WIN
    619 
    620     is_initialized_ = true;
    621     delegate_ = delegate;
    622 
    623     base::EnableTerminationOnHeapCorruption();
    624     base::EnableTerminationOnOutOfMemory();
    625 
    626     // The exit manager is in charge of calling the dtors of singleton objects.
    627     // On Android, AtExitManager is set up when library is loaded.
    628     // On iOS, it's set up in main(), which can't call directly through to here.
    629     // A consequence of this is that you can't use the ctor/dtor-based
    630     // TRACE_EVENT methods on Linux or iOS builds till after we set this up.
    631 #if !defined(OS_ANDROID) && !defined(OS_IOS)
    632     exit_manager_.reset(new base::AtExitManager);
    633 #endif  // !OS_ANDROID && !OS_IOS
    634 
    635 #if defined(OS_MACOSX)
    636     // We need this pool for all the objects created before we get to the
    637     // event loop, but we don't want to leave them hanging around until the
    638     // app quits. Each "main" needs to flush this pool right before it goes into
    639     // its main event loop to get rid of the cruft.
    640     autorelease_pool_.reset(new base::mac::ScopedNSAutoreleasePool());
    641 #endif
    642 
    643     // On Android, the command line is initialized when library is loaded and
    644     // we have already started our TRACE_EVENT0.
    645 #if !defined(OS_ANDROID)
    646     CommandLine::Init(argc, argv);
    647 #endif // !OS_ANDROID
    648 
    649     int exit_code;
    650     if (delegate && delegate->BasicStartupComplete(&exit_code))
    651       return exit_code;
    652 
    653     completed_basic_startup_ = true;
    654 
    655     const CommandLine& command_line = *CommandLine::ForCurrentProcess();
    656     std::string process_type =
    657         command_line.GetSwitchValueASCII(switches::kProcessType);
    658 
    659     if (!GetContentClient())
    660       SetContentClient(&empty_content_client_);
    661     ContentClientInitializer::Set(process_type, delegate_);
    662 
    663 #if defined(OS_WIN)
    664     // Route stdio to parent console (if any) or create one.
    665     if (command_line.HasSwitch(switches::kEnableLogging))
    666       base::RouteStdioToConsole();
    667 #endif
    668 
    669     // Enable startup tracing asap to avoid early TRACE_EVENT calls being
    670     // ignored.
    671     if (command_line.HasSwitch(switches::kTraceStartup)) {
    672       base::debug::CategoryFilter category_filter(
    673           command_line.GetSwitchValueASCII(switches::kTraceStartup));
    674       base::debug::TraceLog::GetInstance()->SetEnabled(
    675           category_filter,
    676           base::debug::TraceLog::RECORD_UNTIL_FULL);
    677     }
    678 #if !defined(OS_ANDROID)
    679     // Android tracing started at the beginning of the method.
    680     // Other OSes have to wait till we get here in order for all the memory
    681     // management setup to be completed.
    682     TRACE_EVENT0("startup", "ContentMainRunnerImpl::Initialize");
    683 #endif // !OS_ANDROID
    684 
    685 #if defined(OS_MACOSX) && !defined(OS_IOS)
    686     // We need to allocate the IO Ports before the Sandbox is initialized or
    687     // the first instance of PowerMonitor is created.
    688     // It's important not to allocate the ports for processes which don't
    689     // register with the power monitor - see crbug.com/88867.
    690     if (process_type.empty() ||
    691         (delegate &&
    692          delegate->ProcessRegistersWithSystemProcess(process_type))) {
    693       base::PowerMonitorDeviceSource::AllocateSystemIOPorts();
    694     }
    695 
    696     if (!process_type.empty() &&
    697         (!delegate || delegate->ShouldSendMachPort(process_type))) {
    698       MachBroker::ChildSendTaskPortToParent();
    699     }
    700 #elif defined(OS_WIN)
    701     if (command_line.HasSwitch(switches::kEnableHighResolutionTime))
    702       base::TimeTicks::SetNowIsHighResNowIfSupported();
    703 
    704     // This must be done early enough since some helper functions like
    705     // IsTouchEnabled, needed to load resources, may call into the theme dll.
    706     EnableThemeSupportOnAllWindowStations();
    707     SetupCRT(command_line);
    708 #endif
    709 
    710 #if defined(OS_POSIX)
    711     if (!process_type.empty()) {
    712       // When you hit Ctrl-C in a terminal running the browser
    713       // process, a SIGINT is delivered to the entire process group.
    714       // When debugging the browser process via gdb, gdb catches the
    715       // SIGINT for the browser process (and dumps you back to the gdb
    716       // console) but doesn't for the child processes, killing them.
    717       // The fix is to have child processes ignore SIGINT; they'll die
    718       // on their own when the browser process goes away.
    719       //
    720       // Note that we *can't* rely on BeingDebugged to catch this case because
    721       // we are the child process, which is not being debugged.
    722       // TODO(evanm): move this to some shared subprocess-init function.
    723       if (!base::debug::BeingDebugged())
    724         signal(SIGINT, SIG_IGN);
    725     }
    726 #endif
    727 
    728 #if defined(USE_NSS)
    729     crypto::EarlySetupForNSSInit();
    730 #endif
    731 
    732     ui::RegisterPathProvider();
    733     RegisterPathProvider();
    734     RegisterContentSchemes(true);
    735 
    736     CHECK(base::i18n::InitializeICU());
    737 
    738     InitializeStatsTable(command_line);
    739 
    740     if (delegate)
    741       delegate->PreSandboxStartup();
    742 
    743     // Set any custom user agent passed on the command line now so the string
    744     // doesn't change between calls to webkit_glue::GetUserAgent(), otherwise it
    745     // defaults to the user agent set during SetContentClient().
    746     if (command_line.HasSwitch(switches::kUserAgent)) {
    747       webkit_glue::SetUserAgent(
    748           command_line.GetSwitchValueASCII(switches::kUserAgent), true);
    749     }
    750 
    751     if (!process_type.empty())
    752       CommonSubprocessInit(process_type);
    753 
    754 #if defined(OS_WIN)
    755     CHECK(InitializeSandbox(sandbox_info));
    756 #elif defined(OS_MACOSX) && !defined(OS_IOS)
    757     if (process_type == switches::kRendererProcess ||
    758         process_type == switches::kPpapiPluginProcess ||
    759         (delegate && delegate->DelaySandboxInitialization(process_type))) {
    760       // On OS X the renderer sandbox needs to be initialized later in the
    761       // startup sequence in RendererMainPlatformDelegate::EnableSandbox().
    762     } else {
    763       CHECK(InitializeSandbox());
    764     }
    765 #endif
    766 
    767     if (delegate)
    768       delegate->SandboxInitialized(process_type);
    769 
    770 #if defined(OS_POSIX) && !defined(OS_IOS)
    771     SetProcessTitleFromCommandLine(argv);
    772 #endif
    773 
    774     // Return -1 to indicate no early termination.
    775     return -1;
    776   }
    777 
    778   virtual int Run() OVERRIDE {
    779     DCHECK(is_initialized_);
    780     DCHECK(!is_shutdown_);
    781     const CommandLine& command_line = *CommandLine::ForCurrentProcess();
    782     std::string process_type =
    783           command_line.GetSwitchValueASCII(switches::kProcessType);
    784 
    785     MainFunctionParams main_params(command_line);
    786 #if defined(OS_WIN)
    787     main_params.sandbox_info = &sandbox_info_;
    788 #elif defined(OS_MACOSX)
    789     main_params.autorelease_pool = autorelease_pool_.get();
    790 #endif
    791 
    792 #if !defined(OS_IOS)
    793     return RunNamedProcessTypeMain(process_type, main_params, delegate_);
    794 #else
    795     return 1;
    796 #endif
    797   }
    798 
    799   virtual void Shutdown() OVERRIDE {
    800     DCHECK(is_initialized_);
    801     DCHECK(!is_shutdown_);
    802 
    803     if (completed_basic_startup_ && delegate_) {
    804       const CommandLine& command_line = *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 
    816     _Module.Term();
    817 #endif  // OS_WIN
    818 
    819 #if defined(OS_MACOSX)
    820     autorelease_pool_.reset(NULL);
    821 #endif
    822 
    823     exit_manager_.reset(NULL);
    824 
    825     delegate_ = NULL;
    826     is_shutdown_ = true;
    827   }
    828 
    829  private:
    830   // True if the runner has been initialized.
    831   bool is_initialized_;
    832 
    833   // True if the runner has been shut down.
    834   bool is_shutdown_;
    835 
    836   // True if basic startup was completed.
    837   bool completed_basic_startup_;
    838 
    839   // Used if the embedder doesn't set one.
    840   ContentClient empty_content_client_;
    841 
    842   // The delegate will outlive this object.
    843   ContentMainDelegate* delegate_;
    844 
    845   scoped_ptr<base::AtExitManager> exit_manager_;
    846 #if defined(OS_WIN)
    847   sandbox::SandboxInterfaceInfo sandbox_info_;
    848 #elif defined(OS_MACOSX)
    849   scoped_ptr<base::mac::ScopedNSAutoreleasePool> autorelease_pool_;
    850 #endif
    851 
    852   DISALLOW_COPY_AND_ASSIGN(ContentMainRunnerImpl);
    853 };
    854 
    855 // static
    856 ContentMainRunner* ContentMainRunner::Create() {
    857   return new ContentMainRunnerImpl();
    858 }
    859 
    860 }  // namespace content
    861