blob: c59b16a89868e5084aa49c64541bb4da37b7c232 [file] [log] [blame]
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/app/content_main.h"
#include "base/at_exit.h"
#include "base/command_line.h"
#include "base/debug/debugger.h"
#include "base/i18n/icu_util.h"
#include "base/logging.h"
#include "base/mac/scoped_nsautorelease_pool.h"
#include "base/memory/scoped_ptr.h"
#include "base/metrics/stats_table.h"
#include "base/process_util.h"
#include "base/stringprintf.h"
#include "base/string_number_conversions.h"
#include "content/app/content_main_delegate.h"
#include "content/app/startup_helper_win.h"
#include "content/browser/browser_main.h"
#include "content/common/content_constants.h"
#include "content/common/content_paths.h"
#include "content/common/content_switches.h"
#include "content/common/main_function_params.h"
#include "content/common/sandbox_init_wrapper.h"
#include "content/common/set_process_title.h"
#include "crypto/nss_util.h"
#include "ipc/ipc_switches.h"
#include "ui/base/ui_base_switches.h"
#include "ui/base/ui_base_paths.h"
#if defined(OS_WIN)
#include <atlbase.h>
#include <atlapp.h>
#include <malloc.h>
#elif defined(OS_MACOSX)
#include "base/mach_ipc_mac.h"
#include "base/system_monitor/system_monitor.h"
#include "content/browser/mach_broker_mac.h"
#endif // OS_WIN
#if defined(OS_POSIX)
#include <signal.h>
#include "base/global_descriptors_posix.h"
#include "content/common/chrome_descriptors.h"
#if !defined(OS_MACOSX)
#include "content/common/zygote_fork_delegate_linux.h"
#endif // OS_POSIX
#if !defined(OS_MACOSX) && defined(USE_TCMALLOC)
extern "C" {
int tc_set_new_mode(int mode);
extern int GpuMain(const MainFunctionParams&);
extern int PluginMain(const MainFunctionParams&);
extern int PpapiPluginMain(const MainFunctionParams&);
extern int PpapiBrokerMain(const MainFunctionParams&);
extern int RendererMain(const MainFunctionParams&);
extern int WorkerMain(const MainFunctionParams&);
extern int UtilityMain(const MainFunctionParams&);
#if defined(OS_POSIX) && !defined(OS_MACOSX)
extern int ZygoteMain(const MainFunctionParams&,
ZygoteForkDelegate* forkdelegate);
namespace {
#if defined(OS_WIN)
static CAppModule _Module;
#elif defined(OS_MACOSX)
// Completes the Mach IPC handshake by sending this process' task port to the
// parent process. The parent is listening on the Mach port given by
// |GetMachPortName()|. The task port is used by the parent to get CPU/memory
// stats to display in the task manager.
void SendTaskPortToParentProcess() {
const mach_msg_timeout_t kTimeoutMs = 100;
const int32_t kMessageId = 0;
std::string mach_port_name = MachBroker::GetMachPortName();
base::MachSendMessage child_message(kMessageId);
if (!child_message.AddDescriptor(mach_task_self())) {
LOG(ERROR) << "child AddDescriptor(mach_task_self()) failed.";
base::MachPortSender child_sender(mach_port_name.c_str());
kern_return_t err = child_sender.SendMessage(child_message, kTimeoutMs);
if (err != KERN_SUCCESS) {
LOG(ERROR) << StringPrintf("child SendMessage() failed: 0x%x %s", err,
#endif // defined(OS_WIN)
#if defined(OS_POSIX)
// Setup signal-handling state: resanitize most signals, ignore SIGPIPE.
void SetupSignalHandlers() {
// Sanitise our signal handling state. Signals that were ignored by our
// parent will also be ignored by us. We also inherit our parent's sigmask.
sigset_t empty_signal_set;
CHECK(0 == sigemptyset(&empty_signal_set));
CHECK(0 == sigprocmask(SIG_SETMASK, &empty_signal_set, NULL));
struct sigaction sigact;
memset(&sigact, 0, sizeof(sigact));
sigact.sa_handler = SIG_DFL;
static const int signals_to_reset[] =
for (unsigned i = 0; i < arraysize(signals_to_reset); i++) {
CHECK(0 == sigaction(signals_to_reset[i], &sigact, NULL));
// Always ignore SIGPIPE. We check the return value of write().
#endif // OS_POSIX
void CommonSubprocessInit(const std::string& process_type) {
#if defined(OS_WIN)
// HACK: Let Windows know that we have started. This is needed to suppress
// the IDC_APPSTARTING cursor from being displayed for a prolonged period
// while a subprocess is starting.
PostThreadMessage(GetCurrentThreadId(), WM_NULL, 0, 0);
MSG msg;
PeekMessage(&msg, NULL, 0, 0, PM_REMOVE);
#if defined(OS_POSIX) && !defined(OS_MACOSX)
// Various things break when you're using a locale where the decimal
// separator isn't a period. See e.g. bugs 22782 and 39964. For
// all processes except the browser process (where we call system
// APIs that may rely on the correct locale for formatting numbers
// when presenting them to the user), reset the locale for numeric
// formatting.
// Note that this is not correct for plugin processes -- they can
// surface UI -- but it's likely they get this wrong too so why not.
setlocale(LC_NUMERIC, "C");
void InitializeStatsTable(base::ProcessId browser_pid,
const CommandLine& command_line) {
// Initialize the Stats Counters table. With this initialized,
// the StatsViewer can be utilized to read counters outside of
// Chrome. These lines can be commented out to effectively turn
// counters 'off'. The table is created and exists for the life
// of the process. It is not cleaned up.
if (command_line.HasSwitch(switches::kEnableStatsTable)) {
// NOTIMPLEMENTED: we probably need to shut this down correctly to avoid
// leaking shared memory regions on posix platforms.
std::string statsfile =
static_cast<unsigned int>(browser_pid));
base::StatsTable* stats_table = new base::StatsTable(statsfile,
content::kStatsMaxThreads, content::kStatsMaxCounters);
// We dispatch to a process-type-specific FooMain() based on a command-line
// flag. This struct is used to build a table of (flag, main function) pairs.
struct MainFunction {
const char* name;
int (*function)(const MainFunctionParams&);
#if defined(OS_POSIX) && !defined(OS_MACOSX)
// On platforms that use the zygote, we have a special subset of
// subprocesses that are launched via the zygote. This function
// fills in some process-launching bits around ZygoteMain().
// Returns the exit code of the subprocess.
int RunZygote(const MainFunctionParams& main_function_params,
content::ContentMainDelegate* delegate) {
static const MainFunction kMainFunctions[] = {
{ switches::kRendererProcess, RendererMain },
{ switches::kWorkerProcess, WorkerMain },
{ switches::kPpapiPluginProcess, PpapiPluginMain },
scoped_ptr<ZygoteForkDelegate> zygote_fork_delegate;
if (delegate) zygote_fork_delegate.reset(delegate->ZygoteStarting());
// This function call can return multiple times, once per fork().
if (!ZygoteMain(main_function_params, zygote_fork_delegate.get()))
return 1;
if (delegate) delegate->ZygoteForked();
// Zygote::HandleForkRequest may have reallocated the command
// line so update it here with the new version.
const CommandLine& command_line = *CommandLine::ForCurrentProcess();
// The StatsTable must be initialized in each process; we already
// initialized for the browser process, now we need to initialize
// within the new processes as well.
pid_t browser_pid = base::GetParentProcessId(
InitializeStatsTable(browser_pid, command_line);
MainFunctionParams main_params(command_line,
// Get the new process type from the new command line.
std::string process_type =
for (size_t i = 0; i < arraysize(kMainFunctions); ++i) {
if (process_type == kMainFunctions[i].name)
return kMainFunctions[i].function(main_params);
if (delegate)
return delegate->RunProcess(process_type, main_params);
NOTREACHED() << "Unknown zygote process type: " << process_type;
return 1;
#endif // defined(OS_POSIX) && !defined(OS_MACOSX)
// Run the FooMain() for a given process type.
// If |process_type| is empty, runs BrowserMain().
// Returns the exit code for this process.
int RunNamedProcessTypeMain(const std::string& process_type,
const MainFunctionParams& main_function_params,
content::ContentMainDelegate* delegate) {
static const MainFunction kMainFunctions[] = {
{ "", BrowserMain },
{ switches::kRendererProcess, RendererMain },
{ switches::kPluginProcess, PluginMain },
{ switches::kWorkerProcess, WorkerMain },
{ switches::kPpapiPluginProcess, PpapiPluginMain },
{ switches::kPpapiBrokerProcess, PpapiBrokerMain },
{ switches::kUtilityProcess, UtilityMain },
{ switches::kGpuProcess, GpuMain },
for (size_t i = 0; i < arraysize(kMainFunctions); ++i) {
if (process_type == kMainFunctions[i].name)
return kMainFunctions[i].function(main_function_params);
#if defined(OS_POSIX) && !defined(OS_MACOSX)
// Zygote startup is special -- see RunZygote comments above
// for why we don't use ZygoteMain directly.
if (process_type == switches::kZygoteProcess)
return RunZygote(main_function_params, delegate);
// If it's a process we don't know about, the embedder should know.
if (delegate)
return delegate->RunProcess(process_type, main_function_params);
NOTREACHED() << "Unknown process type: " << process_type;
return 1;
} // namespace
namespace content {
#if defined(OS_WIN)
int ContentMain(HINSTANCE instance,
sandbox::SandboxInterfaceInfo* sandbox_info,
ContentMainDelegate* delegate) {
// argc/argv are ignored on Windows; see command_line.h for details.
int argc = 0;
char** argv = NULL;
_Module.Init(NULL, static_cast<HINSTANCE>(instance));
int ContentMain(int argc,
const char** argv,
ContentMainDelegate* delegate) {
// NOTE(willchan): One might ask why this call is done here rather than in
// with the definition of
// EnableTerminationOnOutOfMemory(). That's because base shouldn't have a
// dependency on TCMalloc. Really, we ought to have our allocator shim code
// implement this EnableTerminationOnOutOfMemory() function. Whateverz. This
// works for now.
#if !defined(OS_MACOSX) && defined(USE_TCMALLOC)
// For tcmalloc, we need to tell it to behave like new.
// Set C library locale to make sure CommandLine can parse argument values
// in correct encoding.
setlocale(LC_ALL, "");
base::GlobalDescriptors* g_fds = base::GlobalDescriptors::GetInstance();
kPrimaryIPCChannel + base::GlobalDescriptors::kBaseDescriptor);
#if defined(OS_LINUX)
kCrashDumpSignal + base::GlobalDescriptors::kBaseDescriptor);
#endif // OS_WIN
// The exit manager is in charge of calling the dtors of singleton objects.
base::AtExitManager exit_manager;
// We need this pool for all the objects created before we get to the
// event loop, but we don't want to leave them hanging around until the
// app quits. Each "main" needs to flush this pool right before it goes into
// its main event loop to get rid of the cruft.
base::mac::ScopedNSAutoreleasePool autorelease_pool;
CommandLine::Init(argc, argv);
int exit_code;
if (delegate && delegate->BasicStartupComplete(&exit_code))
return exit_code;
const CommandLine& command_line = *CommandLine::ForCurrentProcess();
std::string process_type =
#if defined(OS_MACOSX)
// We need to allocate the IO Ports before the Sandbox is initialized or
// the first instance of SystemMonitor is created.
// It's important not to allocate the ports for processes which don't register
// with the system monitor - see
if (process_type.empty() ||
process_type == switches::kPluginProcess ||
process_type == switches::kRendererProcess ||
process_type == switches::kUtilityProcess ||
process_type == switches::kWorkerProcess ||
(delegate && delegate->ProcessRegistersWithSystemProcess(process_type))) {
if (!process_type.empty() &&
(!delegate || delegate->ShouldSendMachPort(process_type))) {
#elif defined(OS_WIN)
#if defined(OS_POSIX)
if (!process_type.empty()) {
// When you hit Ctrl-C in a terminal running the browser
// process, a SIGINT is delivered to the entire process group.
// When debugging the browser process via gdb, gdb catches the
// SIGINT for the browser process (and dumps you back to the gdb
// console) but doesn't for the child processes, killing them.
// The fix is to have child processes ignore SIGINT; they'll die
// on their own when the browser process goes away.
// Note that we *can't* rely on BeingDebugged to catch this case because we
// are the child process, which is not being debugged.
// TODO(evanm): move this to some shared subprocess-init function.
if (!base::debug::BeingDebugged())
signal(SIGINT, SIG_IGN);
#if defined(USE_NSS)
base::ProcessId browser_pid = base::GetCurrentProcId();
if (command_line.HasSwitch(switches::kProcessChannelID)) {
#if defined(OS_WIN) || defined(OS_MACOSX)
std::string channel_name =
int browser_pid_int;
base::StringToInt(channel_name, &browser_pid_int);
browser_pid = static_cast<base::ProcessId>(browser_pid_int);
DCHECK_NE(browser_pid_int, 0);
#elif defined(OS_POSIX)
// On linux, we're in the zygote here; so we need the parent process' id.
browser_pid = base::GetParentProcessId(base::GetCurrentProcId());
InitializeStatsTable(browser_pid, command_line);
if (delegate) delegate->PreSandboxStartup();
if (!process_type.empty())
// Initialize the sandbox for this process.
SandboxInitWrapper sandbox_wrapper;
bool initialize_sandbox = true;
#if defined(OS_WIN)
#elif defined(OS_MACOSX)
// On OS X the renderer sandbox needs to be initialized later in the startup
// sequence in RendererMainPlatformDelegate::EnableSandbox().
if (process_type == switches::kRendererProcess ||
process_type == switches::kPpapiPluginProcess ||
(delegate && delegate->DelaySandboxInitialization(process_type))) {
initialize_sandbox = false;
if (initialize_sandbox) {
bool sandbox_initialized_ok =
sandbox_wrapper.InitializeSandbox(command_line, process_type);
// Die if the sandbox can't be enabled.
CHECK(sandbox_initialized_ok) << "Error initializing sandbox for "
<< process_type;
if (delegate) delegate->SandboxInitialized(process_type);
#if defined(OS_POSIX)
MainFunctionParams main_params(command_line, sandbox_wrapper,
exit_code = RunNamedProcessTypeMain(process_type, main_params, delegate);
if (delegate) delegate->ProcessExiting(process_type);
#if defined(OS_WIN)
#endif // OS_WIN
return exit_code;
} // namespace content