chrome/app/chrome_main_delegate.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 "chrome/app/chrome_main_delegate.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/files/file_path.h"
   9 #include "base/i18n/rtl.h"
  10 #include "base/lazy_instance.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "base/metrics/statistics_recorder.h"
  13 #include "base/metrics/stats_counters.h"
  14 #include "base/path_service.h"
  15 #include "base/process/memory.h"
  16 #include "base/process/process_handle.h"
  17 #include "base/strings/string_util.h"
  18 #include "build/build_config.h"
  19 #include "chrome/browser/chrome_content_browser_client.h"
  20 #include "chrome/browser/defaults.h"
  21 #include "chrome/common/chrome_constants.h"
  22 #include "chrome/common/chrome_content_client.h"
  23 #include "chrome/common/chrome_paths.h"
  24 #include "chrome/common/chrome_paths_internal.h"
  25 #include "chrome/common/chrome_switches.h"
  26 #include "chrome/common/chrome_version_info.h"
  27 #include "chrome/common/crash_keys.h"
  28 #include "chrome/common/logging_chrome.h"
  29 #include "chrome/common/profiling.h"
  30 #include "chrome/common/switch_utils.h"
  31 #include "chrome/common/url_constants.h"
  32 #include "chrome/plugin/chrome_content_plugin_client.h"
  33 #include "chrome/renderer/chrome_content_renderer_client.h"
  34 #include "chrome/utility/chrome_content_utility_client.h"
  35 #include "components/nacl/common/nacl_switches.h"
  36 #include "components/startup_metric_utils/startup_metric_utils.h"
  37 #include "content/public/common/content_client.h"
  38 #include "content/public/common/content_paths.h"
  39 #include "ui/base/ui_base_switches.h"
  40
  41 #if defined(OS_WIN)
  42 #include <atlbase.h>
  43 #include <malloc.h>
  44 #include <algorithm>
  45 #include "base/strings/string_util.h"
  46 #include "chrome/common/child_process_logging.h"
  47 #include "sandbox/win/src/sandbox.h"
  48 #include "tools/memory_watcher/memory_watcher.h"
  49 #include "ui/base/resource/resource_bundle_win.h"
  50 #endif
  51
  52 #if defined(OS_MACOSX)
  53 #include "base/mac/mac_util.h"
  54 #include "base/mac/os_crash_dumps.h"
  55 #include "chrome/app/chrome_main_mac.h"
  56 #include "chrome/browser/mac/relauncher.h"
  57 #include "chrome/common/chrome_paths_internal.h"
  58 #include "chrome/common/mac/cfbundle_blocker.h"
  59 #include "chrome/common/mac/objc_zombie.h"
  60 #include "components/breakpad/app/breakpad_mac.h"
  61 #include "grit/chromium_strings.h"
  62 #include "ui/base/l10n/l10n_util_mac.h"
  63 #endif
  64
  65 #if defined(OS_POSIX)
  66 #include <locale.h>
  67 #include <signal.h>
  68 #include "chrome/app/chrome_breakpad_client.h"
  69 #include "components/breakpad/app/breakpad_client.h"
  70 #endif
  71
  72 #if !defined(DISABLE_NACL) && defined(OS_LINUX)
  73 #include "components/nacl/common/nacl_paths.h"
  74 #include "components/nacl/zygote/nacl_fork_delegate_linux.h"
  75 #endif
  76
  77 #if defined(OS_CHROMEOS)
  78 #include "base/sys_info.h"
  79 #include "chrome/browser/chromeos/boot_times_loader.h"
  80 #include "chromeos/chromeos_paths.h"
  81 #include "chromeos/chromeos_switches.h"
  82 #endif
  83
  84 #if defined(OS_ANDROID)
  85 #include "chrome/common/descriptors_android.h"
  86 #else
  87 // Diagnostics is only available on non-android platforms.
  88 #include "chrome/browser/diagnostics/diagnostics_controller.h"
  89 #include "chrome/browser/diagnostics/diagnostics_writer.h"
  90 #endif
  91
  92 #if defined(USE_X11)
  93 #include <stdlib.h>
  94 #include <string.h>
  95 #include "ui/base/x/x11_util.h"
  96 #endif
  97
  98 #if defined(OS_POSIX) && !defined(OS_MACOSX)
  99 #include "components/breakpad/app/breakpad_linux.h"
 100 #endif
 101
 102 #if defined(OS_LINUX)
 103 #include "base/environment.h"
 104 #endif
 105
 106 #if defined(OS_MACOSX) || defined(OS_WIN)
 107 #include "chrome/browser/policy/policy_path_parser.h"
 108 #endif
 109
 110 #if !defined(CHROME_MULTIPLE_DLL_CHILD)
 111 base::LazyInstance<chrome::ChromeContentBrowserClient>
 112     g_chrome_content_browser_client = LAZY_INSTANCE_INITIALIZER;
 113 #endif
 114
 115 #if !defined(CHROME_MULTIPLE_DLL_BROWSER)
 116 base::LazyInstance<ChromeContentRendererClient>
 117     g_chrome_content_renderer_client = LAZY_INSTANCE_INITIALIZER;
 118 base::LazyInstance<chrome::ChromeContentUtilityClient>
 119     g_chrome_content_utility_client = LAZY_INSTANCE_INITIALIZER;
 120 base::LazyInstance<chrome::ChromeContentPluginClient>
 121     g_chrome_content_plugin_client = LAZY_INSTANCE_INITIALIZER;
 122 #endif
 123
 124 #if defined(OS_POSIX)
 125 base::LazyInstance<chrome::ChromeBreakpadClient>::Leaky
 126     g_chrome_breakpad_client = LAZY_INSTANCE_INITIALIZER;
 127 #endif
 128
 129 extern int NaClMain(const content::MainFunctionParams&);
 130 extern int ServiceProcessMain(const content::MainFunctionParams&);
 131
 132 namespace {
 133
 134 #if defined(OS_WIN)
 135 const wchar_t kProfilingDll[] = L"memory_watcher.dll";
 136
 137 // Load the memory profiling DLL.  All it needs to be activated
 138 // is to be loaded.  Return true on success, false otherwise.
 139 bool LoadMemoryProfiler() {
 140   HMODULE prof_module = LoadLibrary(kProfilingDll);
 141   return prof_module != NULL;
 142 }
 143
 144 // Early versions of Chrome incorrectly registered a chromehtml: URL handler,
 145 // which gives us nothing but trouble. Avoid launching chrome this way since
 146 // some apps fail to properly escape arguments.
 147 bool HasDeprecatedArguments(const std::wstring& command_line) {
 148   const wchar_t kChromeHtml[] = L"chromehtml:";
 149   std::wstring command_line_lower = command_line;
 150   // We are only searching for ASCII characters so this is OK.
 151   StringToLowerASCII(&command_line_lower);
 152   std::wstring::size_type pos = command_line_lower.find(kChromeHtml);
 153   return (pos != std::wstring::npos);
 154 }
 155
 156 // If we try to access a path that is not currently available, we want the call
 157 // to fail rather than show an error dialog.
 158 void SuppressWindowsErrorDialogs() {
 159   UINT new_flags = SEM_FAILCRITICALERRORS |
 160                    SEM_NOOPENFILEERRORBOX;
 161
 162   // Preserve existing error mode.
 163   UINT existing_flags = SetErrorMode(new_flags);
 164   SetErrorMode(existing_flags | new_flags);
 165 }
 166
 167 #endif  // defined(OS_WIN)
 168
 169 #if defined(OS_LINUX)
 170 static void AdjustLinuxOOMScore(const std::string& process_type) {
 171   // Browsers and zygotes should still be killable, but killed last.
 172   const int kZygoteScore = 0;
 173   // The minimum amount to bump a score by.  This is large enough that
 174   // even if it's translated into the old values, it will still go up
 175   // by at least one.
 176   const int kScoreBump = 100;
 177   // This is the lowest score that renderers and extensions start with
 178   // in the OomPriorityManager.
 179   const int kRendererScore = chrome::kLowestRendererOomScore;
 180   // For "miscellaneous" things, we want them after renderers,
 181   // but before plugins.
 182   const int kMiscScore = kRendererScore - kScoreBump;
 183   // We want plugins to die after the renderers.
 184   const int kPluginScore = kMiscScore - kScoreBump;
 185   int score = -1;
 186
 187   DCHECK(kMiscScore > 0);
 188   DCHECK(kPluginScore > 0);
 189
 190   if (process_type == switches::kPluginProcess ||
 191       process_type == switches::kPpapiPluginProcess) {
 192     score = kPluginScore;
 193   } else if (process_type == switches::kPpapiBrokerProcess) {
 194     // The broker should be killed before the PPAPI plugin.
 195     score = kPluginScore + kScoreBump;
 196   } else if (process_type == switches::kUtilityProcess ||
 197              process_type == switches::kWorkerProcess ||
 198              process_type == switches::kGpuProcess ||
 199              process_type == switches::kServiceProcess) {
 200     score = kMiscScore;
 201 #ifndef DISABLE_NACL
 202   } else if (process_type == switches::kNaClLoaderProcess) {
 203     score = kPluginScore;
 204 #endif
 205   } else if (process_type == switches::kZygoteProcess ||
 206              process_type.empty()) {
 207     // For zygotes and unlabeled process types, we want to still make
 208     // them killable by the OOM killer.
 209     score = kZygoteScore;
 210   } else if (process_type == switches::kRendererProcess) {
 211     LOG(WARNING) << "process type 'renderer' "
 212                  << "should be created through the zygote.";
 213     // When debugging, this process type can end up being run directly, but
 214     // this isn't the typical path for assigning the OOM score for it.  Still,
 215     // we want to assign a score that is somewhat representative for debugging.
 216     score = kRendererScore;
 217   } else {
 218     NOTREACHED() << "Unknown process type";
 219   }
 220   if (score > -1)
 221     base::AdjustOOMScore(base::GetCurrentProcId(), score);
 222 }
 223 #endif  // defined(OS_LINUX)
 224
 225 // Enable the heap profiler if the appropriate command-line switch is
 226 // present, bailing out of the app we can't.
 227 void EnableHeapProfiler(const CommandLine& command_line) {
 228 #if defined(OS_WIN)
 229   if (command_line.HasSwitch(switches::kMemoryProfiling))
 230     if (!LoadMemoryProfiler())
 231       exit(-1);
 232 #endif
 233 }
 234
 235 // Returns true if this subprocess type needs the ResourceBundle initialized
 236 // and resources loaded.
 237 bool SubprocessNeedsResourceBundle(const std::string& process_type) {
 238   return
 239 #if defined(OS_WIN) || defined(OS_MACOSX)
 240       // Windows needs resources for the default/null plugin.
 241       // Mac needs them for the plugin process name.
 242       process_type == switches::kPluginProcess ||
 243       // Needed for scrollbar related images.
 244       process_type == switches::kWorkerProcess ||
 245 #endif
 246 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 247       // The zygote process opens the resources for the renderers.
 248       process_type == switches::kZygoteProcess ||
 249 #endif
 250 #if defined(OS_MACOSX)
 251       // Mac needs them too for scrollbar related images and for sandbox
 252       // profiles.
 253       process_type == switches::kNaClLoaderProcess ||
 254       process_type == switches::kPpapiPluginProcess ||
 255       process_type == switches::kPpapiBrokerProcess ||
 256       process_type == switches::kGpuProcess ||
 257 #endif
 258       process_type == switches::kRendererProcess ||
 259       process_type == switches::kUtilityProcess;
 260 }
 261
 262 #if defined(OS_POSIX)
 263 // Check for --version and --product-version; return true if we encountered
 264 // one of these switches and should exit now.
 265 bool HandleVersionSwitches(const CommandLine& command_line) {
 266   const chrome::VersionInfo version_info;
 267
 268 #if !defined(OS_MACOSX)
 269   if (command_line.HasSwitch(switches::kProductVersion)) {
 270     printf("%s\n", version_info.Version().c_str());
 271     return true;
 272   }
 273 #endif
 274
 275   if (command_line.HasSwitch(switches::kVersion)) {
 276     printf("%s %s %s\n",
 277            version_info.Name().c_str(),
 278            version_info.Version().c_str(),
 279            chrome::VersionInfo::GetVersionStringModifier().c_str());
 280     return true;
 281   }
 282
 283   return false;
 284 }
 285
 286 #if !defined(OS_MACOSX) && !defined(OS_CHROMEOS)
 287 // Show the man page if --help or -h is on the command line.
 288 void HandleHelpSwitches(const CommandLine& command_line) {
 289   if (command_line.HasSwitch(switches::kHelp) ||
 290       command_line.HasSwitch(switches::kHelpShort)) {
 291     base::FilePath binary(command_line.argv()[0]);
 292     execlp("man", "man", binary.BaseName().value().c_str(), NULL);
 293     PLOG(FATAL) << "execlp failed";
 294   }
 295 }
 296 #endif
 297
 298 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
 299 void SIGTERMProfilingShutdown(int signal) {
 300   Profiling::Stop();
 301   struct sigaction sigact;
 302   memset(&sigact, 0, sizeof(sigact));
 303   sigact.sa_handler = SIG_DFL;
 304   CHECK(sigaction(SIGTERM, &sigact, NULL) == 0);
 305   raise(signal);
 306 }
 307
 308 void SetUpProfilingShutdownHandler() {
 309   struct sigaction sigact;
 310   sigact.sa_handler = SIGTERMProfilingShutdown;
 311   sigact.sa_flags = SA_RESETHAND;
 312   sigemptyset(&sigact.sa_mask);
 313   CHECK(sigaction(SIGTERM, &sigact, NULL) == 0);
 314 }
 315 #endif  // !defined(OS_MACOSX) && !defined(OS_ANDROID)
 316
 317 #endif  // OS_POSIX
 318
 319 struct MainFunction {
 320   const char* name;
 321   int (*function)(const content::MainFunctionParams&);
 322 };
 323
 324 // Initializes the user data dir. Must be called before InitializeLocalState().
 325 void InitializeUserDataDir() {
 326   CommandLine* command_line = CommandLine::ForCurrentProcess();
 327   base::FilePath user_data_dir =
 328       command_line->GetSwitchValuePath(switches::kUserDataDir);
 329   std::string process_type =
 330       command_line->GetSwitchValueASCII(switches::kProcessType);
 331
 332 #if defined(OS_LINUX)
 333   // On Linux, Chrome does not support running multiple copies under different
 334   // DISPLAYs, so the profile directory can be specified in the environment to
 335   // support the virtual desktop use-case.
 336   if (user_data_dir.empty()) {
 337     std::string user_data_dir_string;
 338     scoped_ptr<base::Environment> environment(base::Environment::Create());
 339     if (environment->GetVar("CHROME_USER_DATA_DIR", &user_data_dir_string) &&
 340         IsStringUTF8(user_data_dir_string)) {
 341       user_data_dir = base::FilePath::FromUTF8Unsafe(user_data_dir_string);
 342     }
 343   }
 344 #endif
 345 #if defined(OS_MACOSX) || defined(OS_WIN)
 346   policy::path_parser::CheckUserDataDirPolicy(&user_data_dir);
 347 #endif
 348
 349   const bool specified_directory_was_invalid = !user_data_dir.empty() &&
 350       !PathService::OverrideAndCreateIfNeeded(chrome::DIR_USER_DATA,
 351           user_data_dir, true);
 352   // Save inaccessible or invalid paths so the user may be prompted later.
 353   if (specified_directory_was_invalid)
 354     chrome::SetInvalidSpecifiedUserDataDir(user_data_dir);
 355
 356   // Warn and fail early if the process fails to get a user data directory.
 357   if (!PathService::Get(chrome::DIR_USER_DATA, &user_data_dir)) {
 358     // If an invalid command-line or policy override was specified, the user
 359     // will be given an error with that value. Otherwise, use the directory
 360     // returned by PathService (or the fallback default directory) in the error.
 361     if (!specified_directory_was_invalid) {
 362       // PathService::Get() returns false and yields an empty path if it fails
 363       // to create DIR_USER_DATA. Retrieve the default value manually to display
 364       // a more meaningful error to the user in that case.
 365       if (user_data_dir.empty())
 366         chrome::GetDefaultUserDataDirectory(&user_data_dir);
 367       chrome::SetInvalidSpecifiedUserDataDir(user_data_dir);
 368     }
 369
 370     // The browser process (which is identified by an empty |process_type|) will
 371     // handle the error later; other processes that need the dir crash here.
 372     CHECK(process_type.empty()) << "Unable to get the user data directory "
 373                                 << "for process type: " << process_type;
 374   }
 375
 376   // Append the fallback user data directory to the commandline. Otherwise,
 377   // child or service processes will attempt to use the invalid directory.
 378   if (specified_directory_was_invalid)
 379     command_line->AppendSwitchPath(switches::kUserDataDir, user_data_dir);
 380 }
 381
 382 }  // namespace
 383
 384 ChromeMainDelegate::ChromeMainDelegate() {
 385 #if defined(OS_ANDROID)
 386 // On Android the main entry point time is the time when the Java code starts.
 387 // This happens before the shared library containing this code is even loaded.
 388 // The Java startup code has recorded that time, but the C++ code can't fetch it
 389 // from the Java side until it has initialized the JNI. See
 390 // ChromeMainDelegateAndroid.
 391 #else
 392   startup_metric_utils::RecordMainEntryPointTime();
 393 #endif
 394 }
 395
 396 ChromeMainDelegate::~ChromeMainDelegate() {
 397 }
 398
 399 bool ChromeMainDelegate::BasicStartupComplete(int* exit_code) {
 400 #if defined(OS_CHROMEOS)
 401   chromeos::BootTimesLoader::Get()->SaveChromeMainStats();
 402 #endif
 403
 404   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 405
 406 #if defined(OS_MACOSX)
 407   // Give the browser process a longer treadmill, since crashes
 408   // there have more impact.
 409   const bool is_browser = !command_line.HasSwitch(switches::kProcessType);
 410   ObjcEvilDoers::ZombieEnable(true, is_browser ? 10000 : 1000);
 411
 412   SetUpBundleOverrides();
 413   chrome::common::mac::EnableCFBundleBlocker();
 414 #endif
 415
 416   Profiling::ProcessStarted();
 417
 418 #if defined(OS_POSIX)
 419   if (HandleVersionSwitches(command_line)) {
 420     *exit_code = 0;
 421     return true;  // Got a --version switch; exit with a success error code.
 422   }
 423 #if !defined(OS_MACOSX) && !defined(OS_CHROMEOS)
 424   // This will directly exit if the user asked for help.
 425   HandleHelpSwitches(command_line);
 426 #endif
 427 #endif  // OS_POSIX
 428
 429 #if defined(OS_WIN)
 430   // Must do this before any other usage of command line!
 431   if (HasDeprecatedArguments(command_line.GetCommandLineString())) {
 432     *exit_code = 1;
 433     return true;
 434   }
 435 #endif
 436
 437   chrome::RegisterPathProvider();
 438 #if defined(OS_CHROMEOS)
 439   chromeos::RegisterPathProvider();
 440 #endif
 441 #if !defined(DISABLE_NACL) && defined(OS_LINUX)
 442   nacl::RegisterPathProvider();
 443 #endif
 444
 445 // No support for ANDROID yet as DiagnosticsController needs wchar support.
 446 // TODO(gspencer): That's not true anymore, or at least there are no w-string
 447 // references anymore. Not sure if that means this can be enabled on Android or
 448 // not though.  As there is no easily accessible command line on Android, I'm
 449 // not sure this is a big deal.
 450 #if !defined(OS_ANDROID) && !defined(CHROME_MULTIPLE_DLL_CHILD)
 451   // If we are in diagnostics mode this is the end of the line: after the
 452   // diagnostics are run the process will invariably exit.
 453   if (command_line.HasSwitch(switches::kDiagnostics)) {
 454     diagnostics::DiagnosticsWriter::FormatType format =
 455         diagnostics::DiagnosticsWriter::HUMAN;
 456     if (command_line.HasSwitch(switches::kDiagnosticsFormat)) {
 457       std::string format_str =
 458           command_line.GetSwitchValueASCII(switches::kDiagnosticsFormat);
 459       if (format_str == "machine") {
 460         format = diagnostics::DiagnosticsWriter::MACHINE;
 461       } else if (format_str == "log") {
 462         format = diagnostics::DiagnosticsWriter::LOG;
 463       } else {
 464         DCHECK_EQ("human", format_str);
 465       }
 466     }
 467
 468     diagnostics::DiagnosticsWriter writer(format);
 469     *exit_code = diagnostics::DiagnosticsController::GetInstance()->Run(
 470         command_line, &writer);
 471     diagnostics::DiagnosticsController::GetInstance()->ClearResults();
 472     return true;
 473   }
 474 #endif
 475
 476 #if defined(OS_CHROMEOS)
 477   // If we are recovering from a crash on ChromeOS, then we will do some
 478   // recovery using the diagnostics module, and then continue on. We fake up a
 479   // command line to tell it that we want it to recover, and to preserve the
 480   // original command line.
 481   if (command_line.HasSwitch(chromeos::switches::kLoginUser) ||
 482       command_line.HasSwitch(switches::kDiagnosticsRecovery)) {
 483
 484     // The statistics subsystem needs get initialized soon enough for the
 485     // statistics to be collected.  It's safe to call this more than once.
 486     base::StatisticsRecorder::Initialize();
 487
 488     CommandLine interim_command_line(command_line.GetProgram());
 489     const char* kSwitchNames[] = {switches::kUserDataDir, };
 490     interim_command_line.CopySwitchesFrom(
 491         command_line, kSwitchNames, arraysize(kSwitchNames));
 492     interim_command_line.AppendSwitch(switches::kDiagnostics);
 493     interim_command_line.AppendSwitch(switches::kDiagnosticsRecovery);
 494
 495     diagnostics::DiagnosticsWriter::FormatType format =
 496         diagnostics::DiagnosticsWriter::LOG;
 497     if (command_line.HasSwitch(switches::kDiagnosticsFormat)) {
 498       std::string format_str =
 499           command_line.GetSwitchValueASCII(switches::kDiagnosticsFormat);
 500       if (format_str == "machine") {
 501         format = diagnostics::DiagnosticsWriter::MACHINE;
 502       } else if (format_str == "human") {
 503         format = diagnostics::DiagnosticsWriter::HUMAN;
 504       } else {
 505         DCHECK_EQ("log", format_str);
 506       }
 507     }
 508
 509     diagnostics::DiagnosticsWriter writer(format);
 510     int diagnostics_exit_code =
 511         diagnostics::DiagnosticsController::GetInstance()->Run(command_line,
 512                                                                &writer);
 513     if (diagnostics_exit_code) {
 514       // Diagnostics has failed somehow, so we exit.
 515       *exit_code = diagnostics_exit_code;
 516       return true;
 517     }
 518
 519     // Now we run the actual recovery tasks.
 520     int recovery_exit_code =
 521         diagnostics::DiagnosticsController::GetInstance()->RunRecovery(
 522             command_line, &writer);
 523
 524     if (recovery_exit_code) {
 525       // Recovery has failed somehow, so we exit.
 526       *exit_code = recovery_exit_code;
 527       return true;
 528     }
 529   } else {  // Not running diagnostics or recovery.
 530     diagnostics::DiagnosticsController::GetInstance()->RecordRegularStartup();
 531   }
 532 #endif
 533
 534   content::SetContentClient(&chrome_content_client_);
 535
 536   return false;
 537 }
 538
 539 #if defined(OS_MACOSX)
 540 void ChromeMainDelegate::InitMacCrashReporter(
 541     const base::CommandLine& command_line,
 542     const std::string& process_type) {
 543   // TODO(mark): Right now, InitCrashReporter() needs to be called after
 544   // CommandLine::Init() and chrome::RegisterPathProvider().  Ideally,
 545   // Breakpad initialization could occur sooner, preferably even before the
 546   // framework dylib is even loaded, to catch potential early crashes.
 547   breakpad::InitCrashReporter(process_type);
 548
 549 #if defined(NDEBUG)
 550   bool is_debug_build = false;
 551 #else
 552   bool is_debug_build = true;
 553 #endif
 554
 555   // Details on when we enable Apple's Crash reporter.
 556   //
 557   // Motivation:
 558   //    In debug mode it takes Apple's crash reporter eons to generate a crash
 559   // dump.
 560   //
 561   // What we do:
 562   // * We only pass crashes for foreground processes to Apple's Crash
 563   //    reporter. At the time of this writing, that means just the Browser
 564   //    process.
 565   // * If Breakpad is enabled, it will pass browser crashes to Crash Reporter
 566   //    itself.
 567   // * If Breakpad is disabled, we only turn on Crash Reporter for the
 568   //    Browser process in release mode.
 569   if (!command_line.HasSwitch(switches::kDisableBreakpad)) {
 570     bool disable_apple_crash_reporter = is_debug_build ||
 571         base::mac::IsBackgroundOnlyProcess();
 572     if (!breakpad::IsCrashReporterEnabled() && disable_apple_crash_reporter) {
 573       base::mac::DisableOSCrashDumps();
 574     }
 575   }
 576
 577   // Mac Chrome is packaged with a main app bundle and a helper app bundle.
 578   // The main app bundle should only be used for the browser process, so it
 579   // should never see a --type switch (switches::kProcessType).  Likewise,
 580   // the helper should always have a --type switch.
 581   //
 582   // This check is done this late so there is already a call to
 583   // base::mac::IsBackgroundOnlyProcess(), so there is no change in
 584   // startup/initialization order.
 585
 586   // The helper's Info.plist marks it as a background only app.
 587   if (base::mac::IsBackgroundOnlyProcess()) {
 588     CHECK(command_line.HasSwitch(switches::kProcessType) &&
 589           !process_type.empty())
 590         << "Helper application requires --type.";
 591
 592     // In addition, some helper flavors only work with certain process types.
 593     base::FilePath executable;
 594     if (PathService::Get(base::FILE_EXE, &executable) &&
 595         executable.value().size() >= 3) {
 596       std::string last_three =
 597           executable.value().substr(executable.value().size() - 3);
 598
 599       if (last_three == " EH") {
 600         CHECK(process_type == switches::kPluginProcess ||
 601               process_type == switches::kUtilityProcess)
 602             << "Executable-heap process requires --type="
 603             << switches::kPluginProcess << " or "
 604             << switches::kUtilityProcess << ", saw " << process_type;
 605       } else if (last_three == " NP") {
 606         CHECK_EQ(switches::kNaClLoaderProcess, process_type)
 607             << "Non-PIE process requires --type="
 608             << switches::kNaClLoaderProcess << ", saw " << process_type;
 609       } else {
 610         CHECK(process_type != switches::kPluginProcess &&
 611               process_type != switches::kNaClLoaderProcess)
 612             << "Non-executable-heap PIE process is intolerant of --type="
 613             << switches::kPluginProcess << " and "
 614             << switches::kNaClLoaderProcess << ", saw " << process_type;
 615       }
 616     }
 617   } else {
 618     CHECK(!command_line.HasSwitch(switches::kProcessType) &&
 619           process_type.empty())
 620         << "Main application forbids --type, saw " << process_type;
 621   }
 622
 623   if (breakpad::IsCrashReporterEnabled())
 624     breakpad::InitCrashProcessInfo(process_type);
 625 }
 626 #endif  // defined(OS_MACOSX)
 627
 628 void ChromeMainDelegate::PreSandboxStartup() {
 629   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 630   std::string process_type =
 631       command_line.GetSwitchValueASCII(switches::kProcessType);
 632
 633 #if defined(OS_POSIX)
 634   breakpad::SetBreakpadClient(g_chrome_breakpad_client.Pointer());
 635 #endif
 636
 637 #if defined(OS_MACOSX)
 638   // On the Mac, the child executable lives at a predefined location within
 639   // the app bundle's versioned directory.
 640   PathService::Override(content::CHILD_PROCESS_EXE,
 641                         chrome::GetVersionedDirectory().
 642                         Append(chrome::kHelperProcessExecutablePath));
 643
 644   InitMacCrashReporter(command_line, process_type);
 645 #endif
 646
 647 #if defined(OS_WIN)
 648   child_process_logging::Init();
 649 #endif
 650
 651   // Initialize the user data dir for any process type that needs it.
 652   if (chrome::ProcessNeedsProfileDir(process_type))
 653     InitializeUserDataDir();
 654
 655   stats_counter_timer_.reset(new base::StatsCounterTimer("Chrome.Init"));
 656   startup_timer_.reset(new base::StatsScope<base::StatsCounterTimer>
 657                        (*stats_counter_timer_));
 658
 659   // Enable the heap profiler as early as possible!
 660   EnableHeapProfiler(command_line);
 661
 662   // Enable Message Loop related state asap.
 663   if (command_line.HasSwitch(switches::kMessageLoopHistogrammer))
 664     base::MessageLoop::EnableHistogrammer(true);
 665
 666 #if !defined(OS_ANDROID)
 667   // Android does InitLogging when library is loaded. Skip here.
 668   logging::OldFileDeletionState file_state =
 669       logging::APPEND_TO_OLD_LOG_FILE;
 670   if (process_type.empty()) {
 671     file_state = logging::DELETE_OLD_LOG_FILE;
 672   }
 673   logging::InitChromeLogging(command_line, file_state);
 674 #endif
 675
 676 #if defined(OS_WIN)
 677   // TODO(darin): Kill this once http://crbug.com/52609 is fixed.
 678   ui::SetResourcesDataDLL(_AtlBaseModule.GetResourceInstance());
 679 #endif
 680
 681   if (SubprocessNeedsResourceBundle(process_type)) {
 682     // Initialize ResourceBundle which handles files loaded from external
 683     // sources.  The language should have been passed in to us from the
 684     // browser process as a command line flag.
 685 #if defined(DISABLE_NACL)
 686     DCHECK(command_line.HasSwitch(switches::kLang) ||
 687            process_type == switches::kZygoteProcess ||
 688            process_type == switches::kGpuProcess ||
 689            process_type == switches::kPpapiBrokerProcess ||
 690            process_type == switches::kPpapiPluginProcess);
 691 #else
 692     DCHECK(command_line.HasSwitch(switches::kLang) ||
 693            process_type == switches::kZygoteProcess ||
 694            process_type == switches::kGpuProcess ||
 695            process_type == switches::kNaClLoaderProcess ||
 696            process_type == switches::kPpapiBrokerProcess ||
 697            process_type == switches::kPpapiPluginProcess);
 698 #endif
 699
 700     // TODO(markusheintz): The command line flag --lang is actually processed
 701     // by the CommandLinePrefStore, and made available through the PrefService
 702     // via the preference prefs::kApplicationLocale. The browser process uses
 703     // the --lang flag to pass the value of the PrefService in here. Maybe
 704     // this value could be passed in a different way.
 705     const std::string locale =
 706         command_line.GetSwitchValueASCII(switches::kLang);
 707 #if defined(OS_ANDROID)
 708     // The renderer sandbox prevents us from accessing our .pak files directly.
 709     // Therefore file descriptors to the .pak files that we need are passed in
 710     // at process creation time.
 711     int locale_pak_fd = base::GlobalDescriptors::GetInstance()->MaybeGet(
 712         kAndroidLocalePakDescriptor);
 713     CHECK(locale_pak_fd != -1);
 714     ResourceBundle::InitSharedInstanceWithPakFile(base::File(locale_pak_fd),
 715                                                   false);
 716
 717     int extra_pak_keys[] = {
 718       kAndroidChrome100PercentPakDescriptor,
 719       kAndroidUIResourcesPakDescriptor,
 720     };
 721     for (size_t i = 0; i < arraysize(extra_pak_keys); ++i) {
 722       int pak_fd =
 723           base::GlobalDescriptors::GetInstance()->MaybeGet(extra_pak_keys[i]);
 724       CHECK(pak_fd != -1);
 725       ResourceBundle::GetSharedInstance().AddDataPackFromFile(
 726           base::File(pak_fd), ui::SCALE_FACTOR_100P);
 727     }
 728
 729     base::i18n::SetICUDefaultLocale(locale);
 730     const std::string loaded_locale = locale;
 731 #else
 732     const std::string loaded_locale =
 733         ResourceBundle::InitSharedInstanceWithLocale(locale, NULL);
 734
 735     base::FilePath resources_pack_path;
 736     PathService::Get(chrome::FILE_RESOURCES_PACK, &resources_pack_path);
 737     ResourceBundle::GetSharedInstance().AddDataPackFromPath(
 738         resources_pack_path, ui::SCALE_FACTOR_NONE);
 739 #endif
 740     CHECK(!loaded_locale.empty()) << "Locale could not be found for " <<
 741         locale;
 742
 743 #if !defined(CHROME_MULTIPLE_DLL_BROWSER)
 744     if (process_type == switches::kUtilityProcess ||
 745         process_type == switches::kZygoteProcess) {
 746       chrome::ChromeContentUtilityClient::PreSandboxStartup();
 747     }
 748 #endif
 749   }
 750
 751 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 752   // Zygote needs to call InitCrashReporter() in RunZygote().
 753   if (process_type != switches::kZygoteProcess) {
 754 #if defined(OS_ANDROID)
 755     if (process_type.empty())
 756       breakpad::InitCrashReporter(process_type);
 757     else
 758       breakpad::InitNonBrowserCrashReporterForAndroid(process_type);
 759 #else  // !defined(OS_ANDROID)
 760     breakpad::InitCrashReporter(process_type);
 761 #endif  // defined(OS_ANDROID)
 762   }
 763 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX)
 764
 765   // After all the platform Breakpads have been initialized, store the command
 766   // line for crash reporting.
 767   crash_keys::SetSwitchesFromCommandLine(&command_line);
 768 }
 769
 770 void ChromeMainDelegate::SandboxInitialized(const std::string& process_type) {
 771   startup_timer_->Stop();  // End of Startup Time Measurement.
 772
 773   // Note: If you are adding a new process type below, be sure to adjust the
 774   // AdjustLinuxOOMScore function too.
 775 #if defined(OS_LINUX)
 776   AdjustLinuxOOMScore(process_type);
 777 #endif
 778 #if defined(OS_WIN)
 779   SuppressWindowsErrorDialogs();
 780 #endif
 781 }
 782
 783 int ChromeMainDelegate::RunProcess(
 784     const std::string& process_type,
 785     const content::MainFunctionParams& main_function_params) {
 786   // ANDROID doesn't support "service", so no ServiceProcessMain, and arraysize
 787   // doesn't support empty array. So we comment out the block for Android.
 788 #if !defined(OS_ANDROID)
 789   static const MainFunction kMainFunctions[] = {
 790 #if defined(ENABLE_FULL_PRINTING) && !defined(CHROME_MULTIPLE_DLL_CHILD)
 791     { switches::kServiceProcess,     ServiceProcessMain },
 792 #endif
 793
 794 #if defined(OS_MACOSX)
 795     { switches::kRelauncherProcess,
 796       mac_relauncher::internal::RelauncherMain },
 797 #endif
 798
 799     // This entry is not needed on Linux, where the NaCl loader
 800     // process is launched via nacl_helper instead.
 801 #if !defined(DISABLE_NACL) && !defined(CHROME_MULTIPLE_DLL_BROWSER) && \
 802     !defined(OS_LINUX)
 803     { switches::kNaClLoaderProcess,  NaClMain },
 804 #else
 805     { "<invalid>", NULL },  // To avoid constant array of size 0
 806                             // when DISABLE_NACL and CHROME_MULTIPLE_DLL_CHILD
 807 #endif  // DISABLE_NACL
 808   };
 809
 810   for (size_t i = 0; i < arraysize(kMainFunctions); ++i) {
 811     if (process_type == kMainFunctions[i].name)
 812       return kMainFunctions[i].function(main_function_params);
 813   }
 814 #endif
 815
 816   return -1;
 817 }
 818
 819 void ChromeMainDelegate::ProcessExiting(const std::string& process_type) {
 820   if (SubprocessNeedsResourceBundle(process_type))
 821     ResourceBundle::CleanupSharedInstance();
 822 #if !defined(OS_ANDROID)
 823   logging::CleanupChromeLogging();
 824 #else
 825   // Android doesn't use InitChromeLogging, so we close the log file manually.
 826   logging::CloseLogFile();
 827 #endif  // !defined(OS_ANDROID)
 828 }
 829
 830 #if defined(OS_MACOSX)
 831 bool ChromeMainDelegate::ProcessRegistersWithSystemProcess(
 832     const std::string& process_type) {
 833   return process_type == switches::kNaClLoaderProcess;
 834 }
 835
 836 bool ChromeMainDelegate::ShouldSendMachPort(const std::string& process_type) {
 837   return process_type != switches::kRelauncherProcess &&
 838       process_type != switches::kServiceProcess;
 839 }
 840
 841 bool ChromeMainDelegate::DelaySandboxInitialization(
 842     const std::string& process_type) {
 843   // NaClLoader does this in NaClMainPlatformDelegate::EnableSandbox().
 844   // No sandbox needed for relauncher.
 845   return process_type == switches::kNaClLoaderProcess ||
 846       process_type == switches::kRelauncherProcess;
 847 }
 848 #elif defined(OS_POSIX) && !defined(OS_ANDROID)
 849 content::ZygoteForkDelegate* ChromeMainDelegate::ZygoteStarting() {
 850 #if defined(DISABLE_NACL)
 851   return NULL;
 852 #else
 853   return new NaClForkDelegate();
 854 #endif
 855 }
 856
 857 void ChromeMainDelegate::ZygoteForked() {
 858   Profiling::ProcessStarted();
 859   if (Profiling::BeingProfiled()) {
 860     base::debug::RestartProfilingAfterFork();
 861     SetUpProfilingShutdownHandler();
 862   }
 863
 864   // Needs to be called after we have chrome::DIR_USER_DATA.  BrowserMain sets
 865   // this up for the browser process in a different manner.
 866   const CommandLine* command_line = CommandLine::ForCurrentProcess();
 867   std::string process_type =
 868       command_line->GetSwitchValueASCII(switches::kProcessType);
 869   breakpad::InitCrashReporter(process_type);
 870
 871   // Reset the command line for the newly spawned process.
 872   crash_keys::SetSwitchesFromCommandLine(command_line);
 873 }
 874
 875 #endif  // OS_MACOSX
 876
 877 content::ContentBrowserClient*
 878 ChromeMainDelegate::CreateContentBrowserClient() {
 879 #if defined(CHROME_MULTIPLE_DLL_CHILD)
 880   return NULL;
 881 #else
 882   return g_chrome_content_browser_client.Pointer();
 883 #endif
 884 }
 885
 886 content::ContentPluginClient* ChromeMainDelegate::CreateContentPluginClient() {
 887 #if defined(CHROME_MULTIPLE_DLL_BROWSER)
 888   return NULL;
 889 #else
 890   return g_chrome_content_plugin_client.Pointer();
 891 #endif
 892 }
 893
 894 content::ContentRendererClient*
 895 ChromeMainDelegate::CreateContentRendererClient() {
 896 #if defined(CHROME_MULTIPLE_DLL_BROWSER)
 897   return NULL;
 898 #else
 899   return g_chrome_content_renderer_client.Pointer();
 900 #endif
 901 }
 902
 903 content::ContentUtilityClient*
 904 ChromeMainDelegate::CreateContentUtilityClient() {
 905 #if defined(CHROME_MULTIPLE_DLL_BROWSER)
 906   return NULL;
 907 #else
 908   return g_chrome_content_utility_client.Pointer();
 909 #endif
 910 }