content_main_runner.cc revision a02191e04bc25c4935f804f2c080ae28663d096d 
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.h"
34#include "content/public/app/content_main_delegate.h"
35#include "content/public/app/startup_helper_win.h"
36#include "content/public/browser/content_browser_client.h"
37#include "content/public/browser/render_process_host.h"
38#include "content/public/browser/utility_process_host.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#include "ui/gfx/win/dpi.h"
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/public/plugin/content_plugin_client.h"
67#include "content/public/renderer/content_renderer_client.h"
68#include "content/public/utility/content_utility_client.h"
69#endif
70
71#if defined(OS_WIN)
72#include <atlbase.h>
73#include <atlapp.h>
74#include <malloc.h>
75#include <cstring>
76#elif defined(OS_MACOSX)
77#include "base/mac/scoped_nsautorelease_pool.h"
78#if !defined(OS_IOS)
79#include "base/power_monitor/power_monitor_device_source.h"
80#include "content/browser/mach_broker_mac.h"
81#include "content/common/sandbox_init_mac.h"
82#endif  // !OS_IOS
83#endif  // OS_WIN
84
85#if defined(OS_POSIX)
86#include <signal.h>
87
88#include "base/posix/global_descriptors.h"
89#include "content/public/common/content_descriptors.h"
90
91#if !defined(OS_MACOSX)
92#include "content/public/common/zygote_fork_delegate_linux.h"
93#endif
94#if !defined(OS_MACOSX) && !defined(OS_ANDROID)
95#include "content/zygote/zygote_main.h"
96#endif
97
98#endif  // OS_POSIX
99
100#if !defined(OS_MACOSX) && defined(USE_TCMALLOC)
101extern "C" {
102int tc_set_new_mode(int mode);
103}
104#endif
105
106namespace content {
107extern int GpuMain(const content::MainFunctionParams&);
108#if defined(ENABLE_PLUGINS)
109#if !defined(OS_LINUX)
110extern int PluginMain(const content::MainFunctionParams&);
111#endif
112extern int PpapiPluginMain(const MainFunctionParams&);
113extern int PpapiBrokerMain(const MainFunctionParams&);
114#endif
115extern int RendererMain(const content::MainFunctionParams&);
116extern int UtilityMain(const MainFunctionParams&);
117extern int WorkerMain(const MainFunctionParams&);
118}  // namespace content
119
120namespace {
121#if defined(OS_WIN)
122// In order to have Theme support, we need to connect to the theme service.
123// This needs to be done before we lock down the process. Officially this
124// can be done with OpenThemeData() but it fails unless you pass a valid
125// window at least the first time. Interestingly, the very act of creating a
126// window also sets the connection to the theme service.
127void EnableThemeSupportOnAllWindowStations() {
128  HDESK desktop_handle = ::OpenInputDesktop(0, FALSE, READ_CONTROL);
129  if (desktop_handle) {
130    // This means we are running in an input desktop, which implies WinSta0.
131    ::CloseDesktop(desktop_handle);
132    return;
133  }
134
135  HWINSTA current_station = ::GetProcessWindowStation();
136  DCHECK(current_station);
137
138  HWINSTA winsta0 = ::OpenWindowStationA("WinSta0", FALSE, GENERIC_READ);
139  if (!winsta0) {
140    DVLOG(0) << "Unable to open to WinSta0, we: "<< ::GetLastError();
141    return;
142  }
143  if (!::SetProcessWindowStation(winsta0)) {
144    // Could not set the alternate window station. There is a possibility
145    // that the theme wont be correctly initialized.
146    NOTREACHED() << "Unable to switch to WinSta0, we: "<< ::GetLastError();
147    ::CloseWindowStation(winsta0);
148    return;
149  }
150
151  HWND window = ::CreateWindowExW(0, L"Static", L"", WS_POPUP | WS_DISABLED,
152                                  CW_USEDEFAULT, 0, 0, 0,  HWND_MESSAGE, NULL,
153                                  ::GetModuleHandleA(NULL), NULL);
154  if (!window) {
155    DLOG(WARNING) << "failed to enable theme support";
156  } else {
157    ::DestroyWindow(window);
158    window = NULL;
159  }
160
161  // Revert the window station.
162  if (!::SetProcessWindowStation(current_station)) {
163    // We failed to switch back to the secure window station. This might
164    // confuse the process enough that we should kill it now.
165    LOG(FATAL) << "Failed to restore alternate window station";
166  }
167
168  if (!::CloseWindowStation(winsta0)) {
169    // We might be leaking a winsta0 handle.  This is a security risk, but
170    // since we allow fail over to no desktop protection in low memory
171    // condition, this is not a big risk.
172    NOTREACHED();
173  }
174}
175#endif  // defined(OS_WIN)
176}  // namespace
177
178namespace content {
179
180base::LazyInstance<ContentBrowserClient>
181    g_empty_content_browser_client = LAZY_INSTANCE_INITIALIZER;
182#if !defined(OS_IOS) && !defined(CHROME_MULTIPLE_DLL_BROWSER)
183base::LazyInstance<ContentPluginClient>
184    g_empty_content_plugin_client = LAZY_INSTANCE_INITIALIZER;
185base::LazyInstance<ContentRendererClient>
186    g_empty_content_renderer_client = LAZY_INSTANCE_INITIALIZER;
187base::LazyInstance<ContentUtilityClient>
188    g_empty_content_utility_client = LAZY_INSTANCE_INITIALIZER;
189#endif  // !OS_IOS && !CHROME_MULTIPLE_DLL_BROWSER
190
191#if defined(OS_WIN)
192
193static CAppModule _Module;
194
195#endif  // defined(OS_WIN)
196
197#if defined(OS_POSIX) && !defined(OS_IOS)
198
199// Setup signal-handling state: resanitize most signals, ignore SIGPIPE.
200void SetupSignalHandlers() {
201  // Sanitise our signal handling state. Signals that were ignored by our
202  // parent will also be ignored by us. We also inherit our parent's sigmask.
203  sigset_t empty_signal_set;
204  CHECK(0 == sigemptyset(&empty_signal_set));
205  CHECK(0 == sigprocmask(SIG_SETMASK, &empty_signal_set, NULL));
206
207  struct sigaction sigact;
208  memset(&sigact, 0, sizeof(sigact));
209  sigact.sa_handler = SIG_DFL;
210  static const int signals_to_reset[] =
211      {SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGABRT, SIGFPE, SIGSEGV,
212       SIGALRM, SIGTERM, SIGCHLD, SIGBUS, SIGTRAP};  // SIGPIPE is set below.
213  for (unsigned i = 0; i < arraysize(signals_to_reset); i++) {
214    CHECK(0 == sigaction(signals_to_reset[i], &sigact, NULL));
215  }
216
217  // Always ignore SIGPIPE.  We check the return value of write().
218  CHECK(signal(SIGPIPE, SIG_IGN) != SIG_ERR);
219}
220
221#endif  // OS_POSIX && !OS_IOS
222
223void CommonSubprocessInit(const std::string& process_type) {
224#if defined(OS_WIN)
225  // HACK: Let Windows know that we have started.  This is needed to suppress
226  // the IDC_APPSTARTING cursor from being displayed for a prolonged period
227  // while a subprocess is starting.
228  PostThreadMessage(GetCurrentThreadId(), WM_NULL, 0, 0);
229  MSG msg;
230  PeekMessage(&msg, NULL, 0, 0, PM_REMOVE);
231#endif
232#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
233  // Various things break when you're using a locale where the decimal
234  // separator isn't a period.  See e.g. bugs 22782 and 39964.  For
235  // all processes except the browser process (where we call system
236  // APIs that may rely on the correct locale for formatting numbers
237  // when presenting them to the user), reset the locale for numeric
238  // formatting.
239  // Note that this is not correct for plugin processes -- they can
240  // surface UI -- but it's likely they get this wrong too so why not.
241  setlocale(LC_NUMERIC, "C");
242#endif
243}
244
245// Only needed on Windows for creating stats tables.
246#if defined(OS_WIN)
247static base::ProcessId GetBrowserPid(const CommandLine& command_line) {
248  base::ProcessId browser_pid = base::GetCurrentProcId();
249  if (command_line.HasSwitch(switches::kProcessChannelID)) {
250    std::string channel_name =
251        command_line.GetSwitchValueASCII(switches::kProcessChannelID);
252
253    int browser_pid_int;
254    base::StringToInt(channel_name, &browser_pid_int);
255    browser_pid = static_cast<base::ProcessId>(browser_pid_int);
256    DCHECK_NE(browser_pid_int, 0);
257  }
258  return browser_pid;
259}
260#endif
261
262static void InitializeStatsTable(const CommandLine& command_line) {
263  // Initialize the Stats Counters table.  With this initialized,
264  // the StatsViewer can be utilized to read counters outside of
265  // Chrome.  These lines can be commented out to effectively turn
266  // counters 'off'.  The table is created and exists for the life
267  // of the process.  It is not cleaned up.
268  if (command_line.HasSwitch(switches::kEnableStatsTable)) {
269    // NOTIMPLEMENTED: we probably need to shut this down correctly to avoid
270    // leaking shared memory regions on posix platforms.
271#if defined(OS_POSIX)
272    // Stats table is in the global file descriptors table on Posix.
273    base::GlobalDescriptors* global_descriptors =
274        base::GlobalDescriptors::GetInstance();
275    base::FileDescriptor table_ident;
276    if (global_descriptors->MaybeGet(kStatsTableSharedMemFd) != -1) {
277      // Open the shared memory file descriptor passed by the browser process.
278      table_ident = base::FileDescriptor(
279          global_descriptors->Get(kStatsTableSharedMemFd), false);
280    }
281#elif defined(OS_WIN)
282    // Stats table is in a named segment on Windows. Use the PID to make this
283    // unique on the system.
284    std::string table_ident =
285      base::StringPrintf("%s-%u", kStatsFilename,
286          static_cast<unsigned int>(GetBrowserPid(command_line)));
287#endif
288    base::StatsTable* stats_table =
289        new base::StatsTable(table_ident, kStatsMaxThreads, kStatsMaxCounters);
290    base::StatsTable::set_current(stats_table);
291  }
292}
293
294class ContentClientInitializer {
295 public:
296  static void Set(const std::string& process_type,
297                  ContentMainDelegate* delegate) {
298    ContentClient* content_client = GetContentClient();
299    if (process_type.empty()) {
300      if (delegate)
301        content_client->browser_ = delegate->CreateContentBrowserClient();
302      if (!content_client->browser_)
303        content_client->browser_ = &g_empty_content_browser_client.Get();
304    }
305
306#if !defined(OS_IOS) && !defined(CHROME_MULTIPLE_DLL_BROWSER)
307    if (process_type == switches::kPluginProcess ||
308        process_type == switches::kPpapiPluginProcess) {
309      if (delegate)
310        content_client->plugin_ = delegate->CreateContentPluginClient();
311      if (!content_client->plugin_)
312        content_client->plugin_ = &g_empty_content_plugin_client.Get();
313      // Single process not supported in split dll mode.
314    } else if (process_type == switches::kRendererProcess ||
315               CommandLine::ForCurrentProcess()->HasSwitch(
316                   switches::kSingleProcess)) {
317      if (delegate)
318        content_client->renderer_ = delegate->CreateContentRendererClient();
319      if (!content_client->renderer_)
320        content_client->renderer_ = &g_empty_content_renderer_client.Get();
321    }
322
323    if (process_type == switches::kUtilityProcess ||
324        CommandLine::ForCurrentProcess()->HasSwitch(
325            switches::kSingleProcess)) {
326      if (delegate)
327        content_client->utility_ = delegate->CreateContentUtilityClient();
328      // TODO(scottmg): http://crbug.com/237249 Should be in _child.
329      if (!content_client->utility_)
330        content_client->utility_ = &g_empty_content_utility_client.Get();
331    }
332#endif  // !OS_IOS && !CHROME_MULTIPLE_DLL_BROWSER
333  }
334};
335
336// We dispatch to a process-type-specific FooMain() based on a command-line
337// flag.  This struct is used to build a table of (flag, main function) pairs.
338struct MainFunction {
339  const char* name;
340  int (*function)(const MainFunctionParams&);
341};
342
343#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
344// On platforms that use the zygote, we have a special subset of
345// subprocesses that are launched via the zygote.  This function
346// fills in some process-launching bits around ZygoteMain().
347// Returns the exit code of the subprocess.
348int RunZygote(const MainFunctionParams& main_function_params,
349              ContentMainDelegate* delegate) {
350  static const MainFunction kMainFunctions[] = {
351    { switches::kRendererProcess,    RendererMain },
352    { switches::kWorkerProcess,      WorkerMain },
353#if defined(ENABLE_PLUGINS)
354    { switches::kPpapiPluginProcess, PpapiPluginMain },
355#endif
356    { switches::kUtilityProcess,     UtilityMain },
357  };
358
359  scoped_ptr<ZygoteForkDelegate> zygote_fork_delegate;
360  if (delegate) {
361    zygote_fork_delegate.reset(delegate->ZygoteStarting());
362    // Each Renderer we spawn will re-attempt initialization of the media
363    // libraries, at which point failure will be detected and handled, so
364    // we do not need to cope with initialization failures here.
365    base::FilePath media_path;
366    if (PathService::Get(DIR_MEDIA_LIBS, &media_path))
367      media::InitializeMediaLibrary(media_path);
368  }
369
370  // This function call can return multiple times, once per fork().
371  if (!ZygoteMain(main_function_params, zygote_fork_delegate.get()))
372    return 1;
373
374  if (delegate) delegate->ZygoteForked();
375
376  // Zygote::HandleForkRequest may have reallocated the command
377  // line so update it here with the new version.
378  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
379  std::string process_type =
380      command_line.GetSwitchValueASCII(switches::kProcessType);
381  ContentClientInitializer::Set(process_type, delegate);
382
383  // The StatsTable must be initialized in each process; we already
384  // initialized for the browser process, now we need to initialize
385  // within the new processes as well.
386  InitializeStatsTable(command_line);
387
388  MainFunctionParams main_params(command_line);
389
390  for (size_t i = 0; i < arraysize(kMainFunctions); ++i) {
391    if (process_type == kMainFunctions[i].name)
392      return kMainFunctions[i].function(main_params);
393  }
394
395  if (delegate)
396    return delegate->RunProcess(process_type, main_params);
397
398  NOTREACHED() << "Unknown zygote process type: " << process_type;
399  return 1;
400}
401#endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
402
403#if !defined(OS_IOS)
404static void RegisterMainThreadFactories() {
405#if !defined(CHROME_MULTIPLE_DLL_BROWSER)
406  UtilityProcessHost::RegisterUtilityMainThreadFactory(
407      CreateInProcessUtilityThread);
408  RenderProcessHost::RegisterRendererMainThreadFactory(
409      CreateInProcessRendererThread);
410  GpuProcessHost::RegisterGpuMainThreadFactory(
411      CreateInProcessGpuThread);
412#else
413  CommandLine& command_line = *CommandLine::ForCurrentProcess();
414  if (command_line.HasSwitch(switches::kSingleProcess)) {
415    LOG(FATAL) <<
416        "--single-process is not supported in chrome multiple dll browser.";
417  }
418  if (command_line.HasSwitch(switches::kInProcessGPU)) {
419    LOG(FATAL) <<
420        "--in-process-gpu is not supported in chrome multiple dll browser.";
421  }
422#endif
423}
424
425// Run the FooMain() for a given process type.
426// If |process_type| is empty, runs BrowserMain().
427// Returns the exit code for this process.
428int RunNamedProcessTypeMain(
429    const std::string& process_type,
430    const MainFunctionParams& main_function_params,
431    ContentMainDelegate* delegate) {
432  static const MainFunction kMainFunctions[] = {
433#if !defined(CHROME_MULTIPLE_DLL_CHILD)
434    { "",                            BrowserMain },
435#endif
436#if !defined(CHROME_MULTIPLE_DLL_BROWSER)
437#if defined(ENABLE_PLUGINS)
438#if !defined(OS_LINUX)
439    { switches::kPluginProcess,      PluginMain },
440#endif
441    { switches::kWorkerProcess,      WorkerMain },
442    { switches::kPpapiPluginProcess, PpapiPluginMain },
443    { switches::kPpapiBrokerProcess, PpapiBrokerMain },
444#endif  // ENABLE_PLUGINS
445    { switches::kUtilityProcess,     UtilityMain },
446    { switches::kRendererProcess,    RendererMain },
447    { switches::kGpuProcess,         GpuMain },
448#endif  // !CHROME_MULTIPLE_DLL_BROWSER
449  };
450
451  RegisterMainThreadFactories();
452
453  for (size_t i = 0; i < arraysize(kMainFunctions); ++i) {
454    if (process_type == kMainFunctions[i].name) {
455      if (delegate) {
456        int exit_code = delegate->RunProcess(process_type,
457            main_function_params);
458#if defined(OS_ANDROID)
459        // In Android's browser process, the negative exit code doesn't mean the
460        // default behavior should be used as the UI message loop is managed by
461        // the Java and the browser process's default behavior is always
462        // overridden.
463        if (process_type.empty())
464          return exit_code;
465#endif
466        if (exit_code >= 0)
467          return exit_code;
468      }
469      return kMainFunctions[i].function(main_function_params);
470    }
471  }
472
473#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
474  // Zygote startup is special -- see RunZygote comments above
475  // for why we don't use ZygoteMain directly.
476  if (process_type == switches::kZygoteProcess)
477    return RunZygote(main_function_params, delegate);
478#endif
479
480  // If it's a process we don't know about, the embedder should know.
481  if (delegate)
482    return delegate->RunProcess(process_type, main_function_params);
483
484  NOTREACHED() << "Unknown process type: " << process_type;
485  return 1;
486}
487#endif  // !OS_IOS
488
489class ContentMainRunnerImpl : public ContentMainRunner {
490 public:
491  ContentMainRunnerImpl()
492      : is_initialized_(false),
493        is_shutdown_(false),
494        completed_basic_startup_(false),
495        delegate_(NULL),
496        ui_task_(NULL) {
497#if defined(OS_WIN)
498    memset(&sandbox_info_, 0, sizeof(sandbox_info_));
499#endif
500  }
501
502  virtual ~ContentMainRunnerImpl() {
503    if (is_initialized_ && !is_shutdown_)
504      Shutdown();
505  }
506
507#if defined(USE_TCMALLOC)
508  static bool GetAllocatorWasteSizeThunk(size_t* size) {
509    size_t heap_size, allocated_bytes, unmapped_bytes;
510    MallocExtension* ext = MallocExtension::instance();
511    if (ext->GetNumericProperty("generic.heap_size", &heap_size) &&
512        ext->GetNumericProperty("generic.current_allocated_bytes",
513                                &allocated_bytes) &&
514        ext->GetNumericProperty("tcmalloc.pageheap_unmapped_bytes",
515                                &unmapped_bytes)) {
516      *size = heap_size - allocated_bytes - unmapped_bytes;
517      return true;
518    }
519    DCHECK(false);
520    return false;
521  }
522
523  static void GetStatsThunk(char* buffer, int buffer_length) {
524    MallocExtension::instance()->GetStats(buffer, buffer_length);
525  }
526
527  static void ReleaseFreeMemoryThunk() {
528    MallocExtension::instance()->ReleaseFreeMemory();
529  }
530#endif
531
532  virtual int Initialize(const ContentMainParams& params) OVERRIDE {
533    ui_task_ = params.ui_task;
534
535#if defined(OS_WIN)
536    RegisterInvalidParamHandler();
537    _Module.Init(NULL, static_cast<HINSTANCE>(params.instance));
538
539    sandbox_info_ = *params.sandbox_info;
540#else  // !OS_WIN
541
542#if defined(OS_ANDROID)
543    // See note at the initialization of ExitManager, below; basically,
544    // only Android builds have the ctor/dtor handlers set up to use
545    // TRACE_EVENT right away.
546    TRACE_EVENT0("startup", "ContentMainRunnerImpl::Initialize");
547#endif  // OS_ANDROID
548
549    // NOTE(willchan): One might ask why these TCMalloc-related calls are done
550    // here rather than in process_util_linux.cc with the definition of
551    // EnableTerminationOnOutOfMemory().  That's because base shouldn't have a
552    // dependency on TCMalloc.  Really, we ought to have our allocator shim code
553    // implement this EnableTerminationOnOutOfMemory() function.  Whateverz.
554    // This works for now.
555#if !defined(OS_MACOSX) && defined(USE_TCMALLOC)
556
557#if defined(TYPE_PROFILING)
558    base::type_profiler::InterceptFunctions::SetFunctions(
559        base::type_profiler::NewInterceptForTCMalloc,
560        base::type_profiler::DeleteInterceptForTCMalloc);
561#endif
562
563    // For tcmalloc, we need to tell it to behave like new.
564    tc_set_new_mode(1);
565
566    // On windows, we've already set these thunks up in _heap_init()
567    base::allocator::SetGetAllocatorWasteSizeFunction(
568        GetAllocatorWasteSizeThunk);
569    base::allocator::SetGetStatsFunction(GetStatsThunk);
570    base::allocator::SetReleaseFreeMemoryFunction(ReleaseFreeMemoryThunk);
571
572    // Provide optional hook for monitoring allocation quantities on a
573    // per-thread basis.  Only set the hook if the environment indicates this
574    // needs to be enabled.
575    const char* profiling = getenv(tracked_objects::kAlternateProfilerTime);
576    if (profiling &&
577        (atoi(profiling) == tracked_objects::TIME_SOURCE_TYPE_TCMALLOC)) {
578      tracked_objects::SetAlternateTimeSource(
579          MallocExtension::GetBytesAllocatedOnCurrentThread,
580          tracked_objects::TIME_SOURCE_TYPE_TCMALLOC);
581    }
582#endif  // !OS_MACOSX && USE_TCMALLOC
583
584    // On Android,
585    // - setlocale() is not supported.
586    // - We do not override the signal handlers so that we can get
587    //   stack trace when crashing.
588    // - The ipc_fd is passed through the Java service.
589    // Thus, these are all disabled.
590#if !defined(OS_ANDROID) && !defined(OS_IOS)
591    // Set C library locale to make sure CommandLine can parse argument values
592    // in correct encoding.
593    setlocale(LC_ALL, "");
594
595    SetupSignalHandlers();
596
597    base::GlobalDescriptors* g_fds = base::GlobalDescriptors::GetInstance();
598    g_fds->Set(kPrimaryIPCChannel,
599               kPrimaryIPCChannel + base::GlobalDescriptors::kBaseDescriptor);
600#endif  // !OS_ANDROID && !OS_IOS
601
602#if defined(OS_LINUX) || defined(OS_OPENBSD)
603    g_fds->Set(kCrashDumpSignal,
604               kCrashDumpSignal + base::GlobalDescriptors::kBaseDescriptor);
605#endif
606
607#endif  // !OS_WIN
608
609    is_initialized_ = true;
610    delegate_ = params.delegate;
611
612    base::EnableTerminationOnHeapCorruption();
613    base::EnableTerminationOnOutOfMemory();
614
615    // The exit manager is in charge of calling the dtors of singleton objects.
616    // On Android, AtExitManager is set up when library is loaded.
617    // On iOS, it's set up in main(), which can't call directly through to here.
618    // A consequence of this is that you can't use the ctor/dtor-based
619    // TRACE_EVENT methods on Linux or iOS builds till after we set this up.
620#if !defined(OS_ANDROID) && !defined(OS_IOS)
621    if (!ui_task_) {
622      // When running browser tests, don't create a second AtExitManager as that
623      // interfers with shutdown when objects created before ContentMain is
624      // called are destructed when it returns.
625      exit_manager_.reset(new base::AtExitManager);
626    }
627#endif  // !OS_ANDROID && !OS_IOS
628
629#if defined(OS_MACOSX)
630    // We need this pool for all the objects created before we get to the
631    // event loop, but we don't want to leave them hanging around until the
632    // app quits. Each "main" needs to flush this pool right before it goes into
633    // its main event loop to get rid of the cruft.
634    autorelease_pool_.reset(new base::mac::ScopedNSAutoreleasePool());
635#endif
636
637    // On Android, the command line is initialized when library is loaded and
638    // we have already started our TRACE_EVENT0.
639#if !defined(OS_ANDROID)
640    // argc/argv are ignored on Windows and Android; see command_line.h for
641    // details.
642    int argc = 0;
643    const char** argv = NULL;
644
645#if !defined(OS_WIN)
646    argc = params.argc;
647    argv = params.argv;
648#endif
649
650    CommandLine::Init(argc, argv);
651
652#if !defined(OS_IOS)
653    SetProcessTitleFromCommandLine(argv);
654#endif
655#endif // !OS_ANDROID
656
657    int exit_code;
658    if (delegate_ && delegate_->BasicStartupComplete(&exit_code))
659      return exit_code;
660
661    completed_basic_startup_ = true;
662
663    const CommandLine& command_line = *CommandLine::ForCurrentProcess();
664    std::string process_type =
665        command_line.GetSwitchValueASCII(switches::kProcessType);
666
667#if !defined(OS_IOS)
668    // Initialize mojo here so that services can be registered.
669    InitializeMojo();
670#endif
671
672    if (!GetContentClient())
673      SetContentClient(&empty_content_client_);
674    ContentClientInitializer::Set(process_type, delegate_);
675
676#if defined(OS_WIN)
677    // Route stdio to parent console (if any) or create one.
678    if (command_line.HasSwitch(switches::kEnableLogging))
679      base::RouteStdioToConsole();
680#endif
681
682    // Enable startup tracing asap to avoid early TRACE_EVENT calls being
683    // ignored.
684    if (command_line.HasSwitch(switches::kTraceStartup)) {
685      base::debug::CategoryFilter category_filter(
686          command_line.GetSwitchValueASCII(switches::kTraceStartup));
687      base::debug::TraceLog::GetInstance()->SetEnabled(
688          category_filter,
689          base::debug::TraceLog::RECORDING_MODE,
690          base::debug::TraceLog::RECORD_UNTIL_FULL);
691    }
692#if !defined(OS_ANDROID)
693    // Android tracing started at the beginning of the method.
694    // Other OSes have to wait till we get here in order for all the memory
695    // management setup to be completed.
696    TRACE_EVENT0("startup", "ContentMainRunnerImpl::Initialize");
697#endif // !OS_ANDROID
698
699#if defined(OS_MACOSX) && !defined(OS_IOS)
700    // We need to allocate the IO Ports before the Sandbox is initialized or
701    // the first instance of PowerMonitor is created.
702    // It's important not to allocate the ports for processes which don't
703    // register with the power monitor - see crbug.com/88867.
704    if (process_type.empty() ||
705        (delegate_ &&
706         delegate_->ProcessRegistersWithSystemProcess(process_type))) {
707      base::PowerMonitorDeviceSource::AllocateSystemIOPorts();
708    }
709
710    if (!process_type.empty() &&
711        (!delegate_ || delegate_->ShouldSendMachPort(process_type))) {
712      MachBroker::ChildSendTaskPortToParent();
713    }
714#elif defined(OS_WIN)
715    if (command_line.HasSwitch(switches::kEnableHighResolutionTime))
716      base::TimeTicks::SetNowIsHighResNowIfSupported();
717
718    // This must be done early enough since some helper functions like
719    // IsTouchEnabled, needed to load resources, may call into the theme dll.
720    EnableThemeSupportOnAllWindowStations();
721    SetupCRT(command_line);
722#endif
723
724#if defined(OS_POSIX)
725    if (!process_type.empty()) {
726      // When you hit Ctrl-C in a terminal running the browser
727      // process, a SIGINT is delivered to the entire process group.
728      // When debugging the browser process via gdb, gdb catches the
729      // SIGINT for the browser process (and dumps you back to the gdb
730      // console) but doesn't for the child processes, killing them.
731      // The fix is to have child processes ignore SIGINT; they'll die
732      // on their own when the browser process goes away.
733      //
734      // Note that we *can't* rely on BeingDebugged to catch this case because
735      // we are the child process, which is not being debugged.
736      // TODO(evanm): move this to some shared subprocess-init function.
737      if (!base::debug::BeingDebugged())
738        signal(SIGINT, SIG_IGN);
739    }
740#endif
741
742#if defined(USE_NSS)
743    crypto::EarlySetupForNSSInit();
744#endif
745
746    ui::RegisterPathProvider();
747    RegisterPathProvider();
748    RegisterContentSchemes(true);
749
750    CHECK(base::i18n::InitializeICU());
751
752    InitializeStatsTable(command_line);
753
754    if (delegate_)
755      delegate_->PreSandboxStartup();
756
757    if (!process_type.empty())
758      CommonSubprocessInit(process_type);
759
760#if defined(OS_WIN)
761    CHECK(InitializeSandbox(params.sandbox_info));
762#elif defined(OS_MACOSX) && !defined(OS_IOS)
763    if (process_type == switches::kRendererProcess ||
764        process_type == switches::kPpapiPluginProcess ||
765        (delegate_ && delegate_->DelaySandboxInitialization(process_type))) {
766      // On OS X the renderer sandbox needs to be initialized later in the
767      // startup sequence in RendererMainPlatformDelegate::EnableSandbox().
768    } else {
769      CHECK(InitializeSandbox());
770    }
771#endif
772
773    if (delegate_)
774      delegate_->SandboxInitialized(process_type);
775
776    // Return -1 to indicate no early termination.
777    return -1;
778  }
779
780  virtual int Run() OVERRIDE {
781    DCHECK(is_initialized_);
782    DCHECK(!is_shutdown_);
783    const CommandLine& command_line = *CommandLine::ForCurrentProcess();
784    std::string process_type =
785          command_line.GetSwitchValueASCII(switches::kProcessType);
786
787    MainFunctionParams main_params(command_line);
788    main_params.ui_task = ui_task_;
789#if defined(OS_WIN)
790    main_params.sandbox_info = &sandbox_info_;
791#elif defined(OS_MACOSX)
792    main_params.autorelease_pool = autorelease_pool_.get();
793#endif
794
795#if !defined(OS_IOS)
796    return RunNamedProcessTypeMain(process_type, main_params, delegate_);
797#else
798    return 1;
799#endif
800  }
801
802  virtual void Shutdown() OVERRIDE {
803    DCHECK(is_initialized_);
804    DCHECK(!is_shutdown_);
805
806    if (completed_basic_startup_ && delegate_) {
807      const CommandLine& command_line = *CommandLine::ForCurrentProcess();
808      std::string process_type =
809          command_line.GetSwitchValueASCII(switches::kProcessType);
810
811      delegate_->ProcessExiting(process_type);
812    }
813
814#if !defined(OS_IOS)
815    ShutdownMojo();
816#endif
817
818#if defined(OS_WIN)
819#ifdef _CRTDBG_MAP_ALLOC
820    _CrtDumpMemoryLeaks();
821#endif  // _CRTDBG_MAP_ALLOC
822
823    _Module.Term();
824#endif  // OS_WIN
825
826#if defined(OS_MACOSX)
827    autorelease_pool_.reset(NULL);
828#endif
829
830    exit_manager_.reset(NULL);
831
832    delegate_ = NULL;
833    is_shutdown_ = true;
834  }
835
836 private:
837  // True if the runner has been initialized.
838  bool is_initialized_;
839
840  // True if the runner has been shut down.
841  bool is_shutdown_;
842
843  // True if basic startup was completed.
844  bool completed_basic_startup_;
845
846  // Used if the embedder doesn't set one.
847  ContentClient empty_content_client_;
848
849  // The delegate will outlive this object.
850  ContentMainDelegate* delegate_;
851
852  scoped_ptr<base::AtExitManager> exit_manager_;
853#if defined(OS_WIN)
854  sandbox::SandboxInterfaceInfo sandbox_info_;
855#elif defined(OS_MACOSX)
856  scoped_ptr<base::mac::ScopedNSAutoreleasePool> autorelease_pool_;
857#endif
858
859  base::Closure* ui_task_;
860
861  DISALLOW_COPY_AND_ASSIGN(ContentMainRunnerImpl);
862};
863
864// static
865ContentMainRunner* ContentMainRunner::Create() {
866  return new ContentMainRunnerImpl();
867}
868
869}  // namespace content
870