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gecko-dev/ipc/glue/GeckoChildProcessHost.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*/
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla IPC.
*
* The Initial Developer of the Original Code is
* Ben Turner <bent.mozilla@gmail.com>.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "GeckoChildProcessHost.h"
#include "base/command_line.h"
#include "base/path_service.h"
#include "base/string_util.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/process_watcher.h"
#ifdef XP_MACOSX
#include "chrome/common/mach_ipc_mac.h"
#include "base/rand_util.h"
#include "nsILocalFileMac.h"
#endif
#include "prprf.h"
#include "prenv.h"
#if defined(OS_LINUX)
# define XP_LINUX 1
#endif
#include "nsExceptionHandler.h"
#include "nsDirectoryServiceDefs.h"
#include "nsIFile.h"
#include "nsILocalFile.h"
#include "mozilla/ipc/BrowserProcessSubThread.h"
#include "mozilla/Omnijar.h"
#include <sys/stat.h>
#ifdef XP_WIN
#include "nsIWinTaskbar.h"
#define NS_TASKBAR_CONTRACTID "@mozilla.org/windows-taskbar;1"
#endif
#ifdef ANDROID
#include "APKOpen.h"
#endif
using mozilla::MonitorAutoLock;
using mozilla::ipc::GeckoChildProcessHost;
#ifdef ANDROID
// Like its predecessor in nsExceptionHandler.cpp, this is
// the magic number of a file descriptor remapping we must
// preserve for the child process.
static const int kMagicAndroidSystemPropFd = 5;
#endif
static bool
ShouldHaveDirectoryService()
{
return GeckoProcessType_Default == XRE_GetProcessType();
}
template<>
struct RunnableMethodTraits<GeckoChildProcessHost>
{
static void RetainCallee(GeckoChildProcessHost* obj) { }
static void ReleaseCallee(GeckoChildProcessHost* obj) { }
};
GeckoChildProcessHost::GeckoChildProcessHost(GeckoProcessType aProcessType,
base::WaitableEventWatcher::Delegate* aDelegate)
: ChildProcessHost(RENDER_PROCESS), // FIXME/cjones: we should own this enum
mProcessType(aProcessType),
mMonitor("mozilla.ipc.GeckChildProcessHost.mMonitor"),
mLaunched(false),
mChannelInitialized(false),
mDelegate(aDelegate),
mChildProcessHandle(0)
#if defined(XP_MACOSX)
, mChildTask(MACH_PORT_NULL)
#endif
{
MOZ_COUNT_CTOR(GeckoChildProcessHost);
MessageLoop* ioLoop = XRE_GetIOMessageLoop();
ioLoop->PostTask(FROM_HERE,
NewRunnableMethod(this,
&GeckoChildProcessHost::InitializeChannel));
}
GeckoChildProcessHost::~GeckoChildProcessHost()
{
AssertIOThread();
MOZ_COUNT_DTOR(GeckoChildProcessHost);
if (mChildProcessHandle > 0)
ProcessWatcher::EnsureProcessTerminated(mChildProcessHandle
#if defined(NS_BUILD_REFCNT_LOGGING)
, false // don't "force"
#endif
);
#if defined(XP_MACOSX)
if (mChildTask != MACH_PORT_NULL)
mach_port_deallocate(mach_task_self(), mChildTask);
#endif
}
void GetPathToBinary(FilePath& exePath)
{
#if defined(OS_WIN)
exePath = FilePath::FromWStringHack(CommandLine::ForCurrentProcess()->program());
exePath = exePath.DirName();
exePath = exePath.AppendASCII(MOZ_CHILD_PROCESS_NAME);
#elif defined(OS_POSIX)
if (ShouldHaveDirectoryService()) {
nsCOMPtr<nsIProperties> directoryService(do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID));
NS_ASSERTION(directoryService, "Expected XPCOM to be available");
if (directoryService) {
nsCOMPtr<nsIFile> greDir;
nsresult rv = directoryService->Get(NS_GRE_DIR, NS_GET_IID(nsIFile), getter_AddRefs(greDir));
if (NS_SUCCEEDED(rv)) {
nsCString path;
greDir->GetNativePath(path);
exePath = FilePath(path.get());
}
}
}
if (exePath.empty()) {
exePath = FilePath(CommandLine::ForCurrentProcess()->argv()[0]);
exePath = exePath.DirName();
}
#ifdef OS_MACOSX
// We need to use an App Bundle on OS X so that we can hide
// the dock icon. See Bug 557225
exePath = exePath.AppendASCII(MOZ_CHILD_PROCESS_BUNDLE);
#endif
exePath = exePath.AppendASCII(MOZ_CHILD_PROCESS_NAME);
#endif
}
#ifdef XP_MACOSX
class AutoCFTypeObject {
public:
AutoCFTypeObject(CFTypeRef object)
{
mObject = object;
}
~AutoCFTypeObject()
{
::CFRelease(mObject);
}
private:
CFTypeRef mObject;
};
#endif
nsresult GeckoChildProcessHost::GetArchitecturesForBinary(const char *path, uint32 *result)
{
*result = 0;
#ifdef XP_MACOSX
CFURLRef url = ::CFURLCreateFromFileSystemRepresentation(kCFAllocatorDefault,
(const UInt8*)path,
strlen(path),
false);
if (!url) {
return NS_ERROR_FAILURE;
}
AutoCFTypeObject autoPluginContainerURL(url);
CFArrayRef pluginContainerArchs = ::CFBundleCopyExecutableArchitecturesForURL(url);
if (!pluginContainerArchs) {
return NS_ERROR_FAILURE;
}
AutoCFTypeObject autoPluginContainerArchs(pluginContainerArchs);
CFIndex pluginArchCount = ::CFArrayGetCount(pluginContainerArchs);
for (CFIndex i = 0; i < pluginArchCount; i++) {
CFNumberRef currentArch = static_cast<CFNumberRef>(::CFArrayGetValueAtIndex(pluginContainerArchs, i));
int currentArchInt = 0;
if (!::CFNumberGetValue(currentArch, kCFNumberIntType, &currentArchInt)) {
continue;
}
switch (currentArchInt) {
case kCFBundleExecutableArchitectureI386:
*result |= base::PROCESS_ARCH_I386;
break;
case kCFBundleExecutableArchitectureX86_64:
*result |= base::PROCESS_ARCH_X86_64;
break;
case kCFBundleExecutableArchitecturePPC:
*result |= base::PROCESS_ARCH_PPC;
break;
default:
break;
}
}
return (*result ? NS_OK : NS_ERROR_FAILURE);
#else
return NS_ERROR_NOT_IMPLEMENTED;
#endif
}
uint32 GeckoChildProcessHost::GetSupportedArchitecturesForProcessType(GeckoProcessType type)
{
#ifdef XP_MACOSX
if (type == GeckoProcessType_Plugin) {
// Cache this, it shouldn't ever change.
static uint32 pluginContainerArchs = 0;
if (pluginContainerArchs == 0) {
FilePath exePath;
GetPathToBinary(exePath);
nsresult rv = GetArchitecturesForBinary(exePath.value().c_str(), &pluginContainerArchs);
NS_ASSERTION(NS_SUCCEEDED(rv) && pluginContainerArchs != 0, "Getting architecture of plugin container failed!");
if (NS_FAILED(rv) || pluginContainerArchs == 0) {
pluginContainerArchs = base::GetCurrentProcessArchitecture();
}
}
return pluginContainerArchs;
}
#endif
return base::GetCurrentProcessArchitecture();
}
#ifdef XP_WIN
void GeckoChildProcessHost::InitWindowsGroupID()
{
// On Win7+, pass the application user model to the child, so it can
// register with it. This insures windows created by the container
// properly group with the parent app on the Win7 taskbar.
nsCOMPtr<nsIWinTaskbar> taskbarInfo =
do_GetService(NS_TASKBAR_CONTRACTID);
if (taskbarInfo) {
PRBool isSupported = PR_FALSE;
taskbarInfo->GetAvailable(&isSupported);
nsAutoString appId;
if (isSupported && NS_SUCCEEDED(taskbarInfo->GetDefaultGroupId(appId))) {
mGroupId.Append(appId);
} else {
mGroupId.AssignLiteral("-");
}
}
}
#endif
bool
GeckoChildProcessHost::SyncLaunch(std::vector<std::string> aExtraOpts, int aTimeoutMs, base::ProcessArchitecture arch)
{
#ifdef XP_WIN
InitWindowsGroupID();
#endif
PRIntervalTime timeoutTicks = (aTimeoutMs > 0) ?
PR_MillisecondsToInterval(aTimeoutMs) : PR_INTERVAL_NO_TIMEOUT;
MessageLoop* ioLoop = XRE_GetIOMessageLoop();
NS_ASSERTION(MessageLoop::current() != ioLoop, "sync launch from the IO thread NYI");
ioLoop->PostTask(FROM_HERE,
NewRunnableMethod(this,
&GeckoChildProcessHost::PerformAsyncLaunch,
aExtraOpts, arch));
// NB: this uses a different mechanism than the chromium parent
// class.
MonitorAutoLock lock(mMonitor);
PRIntervalTime waitStart = PR_IntervalNow();
PRIntervalTime current;
// We'll receive several notifications, we need to exit when we
// have either successfully launched or have timed out.
while (!mLaunched) {
lock.Wait(timeoutTicks);
if (timeoutTicks != PR_INTERVAL_NO_TIMEOUT) {
current = PR_IntervalNow();
PRIntervalTime elapsed = current - waitStart;
if (elapsed > timeoutTicks) {
break;
}
timeoutTicks = timeoutTicks - elapsed;
waitStart = current;
}
}
return mLaunched;
}
bool
GeckoChildProcessHost::AsyncLaunch(std::vector<std::string> aExtraOpts)
{
#ifdef XP_WIN
InitWindowsGroupID();
#endif
MessageLoop* ioLoop = XRE_GetIOMessageLoop();
ioLoop->PostTask(FROM_HERE,
NewRunnableMethod(this,
&GeckoChildProcessHost::PerformAsyncLaunch,
aExtraOpts, base::GetCurrentProcessArchitecture()));
// This may look like the sync launch wait, but we only delay as
// long as it takes to create the channel.
MonitorAutoLock lock(mMonitor);
while (!mChannelInitialized) {
lock.Wait();
}
return true;
}
void
GeckoChildProcessHost::InitializeChannel()
{
CreateChannel();
MonitorAutoLock lock(mMonitor);
mChannelInitialized = true;
lock.Notify();
}
PRInt32 GeckoChildProcessHost::mChildCounter = 0;
//
// Wrapper function for handling GECKO_SEPARATE_NSPR_LOGS
//
bool
GeckoChildProcessHost::PerformAsyncLaunch(std::vector<std::string> aExtraOpts, base::ProcessArchitecture arch)
{
// If separate NSPR log files are not requested, we're done.
const char* origLogName = PR_GetEnv("NSPR_LOG_FILE");
const char* separateLogs = PR_GetEnv("GECKO_SEPARATE_NSPR_LOGS");
if (!origLogName || !separateLogs || !*separateLogs ||
*separateLogs == '0' || *separateLogs == 'N' || *separateLogs == 'n') {
return PerformAsyncLaunchInternal(aExtraOpts, arch);
}
// We currently have no portable way to launch child with environment
// different than parent. So temporarily change NSPR_LOG_FILE so child
// inherits value we want it to have. (NSPR only looks at NSPR_LOG_FILE at
// startup, so it's 'safe' to play with the parent's environment this way.)
nsCAutoString setChildLogName("NSPR_LOG_FILE=");
setChildLogName.Append(origLogName);
// remember original value so we can restore it.
// - buffer needs to be permanently allocated for PR_SetEnv()
// - Note: this code is not called re-entrantly, nor are restoreOrigLogName
// or mChildCounter touched by any other thread, so this is safe.
static char* restoreOrigLogName = 0;
if (!restoreOrigLogName)
restoreOrigLogName = strdup(setChildLogName.get());
// Append child-specific postfix to name
setChildLogName.AppendLiteral(".child-");
setChildLogName.AppendInt(++mChildCounter);
// Passing temporary to PR_SetEnv is ok here because env gets copied
// by exec, etc., to permanent storage in child when process launched.
PR_SetEnv(setChildLogName.get());
bool retval = PerformAsyncLaunchInternal(aExtraOpts, arch);
// Revert to original value
PR_SetEnv(restoreOrigLogName);
return retval;
}
bool
GeckoChildProcessHost::PerformAsyncLaunchInternal(std::vector<std::string>& aExtraOpts, base::ProcessArchitecture arch)
{
// FIXME/cjones: make this work from non-IO threads, too
// We rely on the fact that InitializeChannel() has already been processed
// on the IO thread before this point is reached.
if (!GetChannel()) {
return false;
}
base::ProcessHandle process;
// send the child the PID so that it can open a ProcessHandle back to us.
// probably don't want to do this in the long run
char pidstring[32];
PR_snprintf(pidstring, sizeof(pidstring) - 1,
"%ld", base::Process::Current().pid());
const char* const childProcessType =
XRE_ChildProcessTypeToString(mProcessType);
//--------------------------------------------------
#if defined(OS_POSIX)
// For POSIX, we have to be extremely anal about *not* using
// std::wstring in code compiled with Mozilla's -fshort-wchar
// configuration, because chromium is compiled with -fno-short-wchar
// and passing wstrings from one config to the other is unsafe. So
// we split the logic here.
#if defined(OS_LINUX) || defined(OS_MACOSX)
base::environment_map newEnvVars;
// XPCOM may not be initialized in some subprocesses. We don't want
// to initialize XPCOM just for the directory service, especially
// since LD_LIBRARY_PATH is already set correctly in subprocesses
// (meaning that we don't need to set that up in the environment).
if (ShouldHaveDirectoryService()) {
nsCOMPtr<nsIProperties> directoryService(do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID));
NS_ASSERTION(directoryService, "Expected XPCOM to be available");
if (directoryService) {
nsCOMPtr<nsIFile> greDir;
nsresult rv = directoryService->Get(NS_GRE_DIR, NS_GET_IID(nsIFile), getter_AddRefs(greDir));
if (NS_SUCCEEDED(rv)) {
nsCString path;
greDir->GetNativePath(path);
# ifdef OS_LINUX
# ifdef ANDROID
path += "/lib";
# endif // ANDROID
newEnvVars["LD_LIBRARY_PATH"] = path.get();
# elif OS_MACOSX
newEnvVars["DYLD_LIBRARY_PATH"] = path.get();
// XXX DYLD_INSERT_LIBRARIES should only be set when launching a plugin
// process, and has no effect on other subprocesses (the hooks in
// libplugin_child_interpose.dylib become noops). But currently it
// gets set when launching any kind of subprocess.
//
// Trigger "dyld interposing" for the dylib that contains
// plugin_child_interpose.mm. This allows us to hook OS calls in the
// plugin process (ones that don't work correctly in a background
// process). Don't break any other "dyld interposing" that has already
// been set up by whatever may have launched the browser.
const char* prevInterpose = PR_GetEnv("DYLD_INSERT_LIBRARIES");
nsCString interpose;
if (prevInterpose) {
interpose.Assign(prevInterpose);
interpose.AppendLiteral(":");
}
interpose.Append(path.get());
interpose.AppendLiteral("/libplugin_child_interpose.dylib");
newEnvVars["DYLD_INSERT_LIBRARIES"] = interpose.get();
# endif // OS_LINUX
}
}
}
#endif // OS_LINUX || OS_MACOSX
FilePath exePath;
GetPathToBinary(exePath);
#ifdef ANDROID
// The java wrapper unpacks this for us but can't make it executable
chmod(exePath.value().c_str(), 0700);
int cacheCount = 0;
const struct lib_cache_info * cache = getLibraryCache();
nsCString cacheStr;
while (cache &&
cacheCount++ < MAX_LIB_CACHE_ENTRIES &&
strlen(cache->name)) {
mFileMap.push_back(std::pair<int,int>(cache->fd, cache->fd));
cacheStr.Append(cache->name);
cacheStr.AppendPrintf(":%d;", cache->fd);
cache++;
}
// fill the last arg with something if there's no cache
if (cacheStr.IsEmpty())
cacheStr.AppendLiteral("-");
// Remap the Android property workspace to a well-known int,
// and update the environment to reflect the new value for the
// child process.
const char *apws = getenv("ANDROID_PROPERTY_WORKSPACE");
if (apws) {
int fd = atoi(apws);
mFileMap.push_back(std::pair<int, int>(fd, kMagicAndroidSystemPropFd));
char buf[32];
char *szptr = strchr(apws, ',');
snprintf(buf, sizeof(buf), "%d%s", kMagicAndroidSystemPropFd, szptr);
newEnvVars["ANDROID_PROPERTY_WORKSPACE"] = buf;
}
#endif // ANDROID
// remap the IPC socket fd to a well-known int, as the OS does for
// STDOUT_FILENO, for example
int srcChannelFd, dstChannelFd;
channel().GetClientFileDescriptorMapping(&srcChannelFd, &dstChannelFd);
mFileMap.push_back(std::pair<int,int>(srcChannelFd, dstChannelFd));
// no need for kProcessChannelID, the child process inherits the
// other end of the socketpair() from us
std::vector<std::string> childArgv;
childArgv.push_back(exePath.value());
childArgv.insert(childArgv.end(), aExtraOpts.begin(), aExtraOpts.end());
if (Omnijar::IsInitialized()) {
// Make sure that child processes can find the omnijar
// See XRE_InitCommandLine in nsAppRunner.cpp
nsCAutoString path;
nsCOMPtr<nsIFile> file = Omnijar::GetPath(Omnijar::GRE);
if (file && NS_SUCCEEDED(file->GetNativePath(path))) {
childArgv.push_back("-greomni");
childArgv.push_back(path.get());
}
file = Omnijar::GetPath(Omnijar::APP);
if (file && NS_SUCCEEDED(file->GetNativePath(path))) {
childArgv.push_back("-appomni");
childArgv.push_back(path.get());
}
}
childArgv.push_back(pidstring);
#if defined(MOZ_CRASHREPORTER)
# if defined(OS_LINUX)
int childCrashFd, childCrashRemapFd;
if (!CrashReporter::CreateNotificationPipeForChild(
&childCrashFd, &childCrashRemapFd))
return false;
if (0 <= childCrashFd) {
mFileMap.push_back(std::pair<int,int>(childCrashFd, childCrashRemapFd));
// "true" == crash reporting enabled
childArgv.push_back("true");
}
else {
// "false" == crash reporting disabled
childArgv.push_back("false");
}
# elif defined(XP_MACOSX)
childArgv.push_back(CrashReporter::GetChildNotificationPipe());
# endif // OS_LINUX
#endif
#ifdef XP_MACOSX
// Add a mach port to the command line so the child can communicate its
// 'task_t' back to the parent.
//
// Put a random number into the channel name, so that a compromised renderer
// can't pretend being the child that's forked off.
std::string mach_connection_name = StringPrintf("org.mozilla.machname.%d",
base::RandInt(0, std::numeric_limits<int>::max()));
childArgv.push_back(mach_connection_name.c_str());
#endif
childArgv.push_back(childProcessType);
#ifdef ANDROID
childArgv.push_back(cacheStr.get());
#endif
base::LaunchApp(childArgv, mFileMap,
#if defined(OS_LINUX) || defined(OS_MACOSX)
newEnvVars,
#endif
false, &process, arch);
#ifdef XP_MACOSX
// Wait for the child process to send us its 'task_t' data.
const int kTimeoutMs = 10000;
MachReceiveMessage child_message;
ReceivePort parent_recv_port(mach_connection_name.c_str());
kern_return_t err = parent_recv_port.WaitForMessage(&child_message, kTimeoutMs);
if (err != KERN_SUCCESS) {
std::string errString = StringPrintf("0x%x %s", err, mach_error_string(err));
LOG(ERROR) << "parent WaitForMessage() failed: " << errString;
return false;
}
task_t child_task = child_message.GetTranslatedPort(0);
if (child_task == MACH_PORT_NULL) {
LOG(ERROR) << "parent GetTranslatedPort(0) failed.";
return false;
}
if (child_message.GetTranslatedPort(1) == MACH_PORT_NULL) {
LOG(ERROR) << "parent GetTranslatedPort(1) failed.";
return false;
}
MachPortSender parent_sender(child_message.GetTranslatedPort(1));
MachSendMessage parent_message(/* id= */0);
if (!parent_message.AddDescriptor(bootstrap_port)) {
LOG(ERROR) << "parent AddDescriptor(" << bootstrap_port << ") failed.";
return false;
}
err = parent_sender.SendMessage(parent_message, kTimeoutMs);
if (err != KERN_SUCCESS) {
std::string errString = StringPrintf("0x%x %s", err, mach_error_string(err));
LOG(ERROR) << "parent SendMessage() failed: " << errString;
return false;
}
#endif
//--------------------------------------------------
#elif defined(OS_WIN)
FilePath exePath;
GetPathToBinary(exePath);
CommandLine cmdLine(exePath.ToWStringHack());
cmdLine.AppendSwitchWithValue(switches::kProcessChannelID, channel_id());
for (std::vector<std::string>::iterator it = aExtraOpts.begin();
it != aExtraOpts.end();
++it) {
cmdLine.AppendLooseValue(UTF8ToWide(*it));
}
cmdLine.AppendLooseValue(std::wstring(mGroupId.get()));
if (Omnijar::IsInitialized()) {
// Make sure the child process can find the omnijar
// See XRE_InitCommandLine in nsAppRunner.cpp
nsAutoString path;
nsCOMPtr<nsIFile> file = Omnijar::GetPath(Omnijar::GRE);
if (file && NS_SUCCEEDED(file->GetPath(path))) {
cmdLine.AppendLooseValue(UTF8ToWide("-greomni"));
cmdLine.AppendLooseValue(path.get());
}
file = Omnijar::GetPath(Omnijar::APP);
if (file && NS_SUCCEEDED(file->GetPath(path))) {
cmdLine.AppendLooseValue(UTF8ToWide("-appomni"));
cmdLine.AppendLooseValue(path.get());
}
}
cmdLine.AppendLooseValue(UTF8ToWide(pidstring));
#if defined(MOZ_CRASHREPORTER)
cmdLine.AppendLooseValue(
UTF8ToWide(CrashReporter::GetChildNotificationPipe()));
#endif
cmdLine.AppendLooseValue(UTF8ToWide(childProcessType));
base::LaunchApp(cmdLine, false, false, &process);
#else
# error Sorry
#endif
if (!process) {
return false;
}
SetHandle(process);
#if defined(XP_MACOSX)
mChildTask = child_task;
#endif
return true;
}
void
GeckoChildProcessHost::OnChannelConnected(int32 peer_pid)
{
MonitorAutoLock lock(mMonitor);
mLaunched = true;
if (!base::OpenPrivilegedProcessHandle(peer_pid, &mChildProcessHandle))
NS_RUNTIMEABORT("can't open handle to child process");
lock.Notify();
}
// XXX/cjones: these next two methods should basically never be called.
// after the process is launched, its channel will be used to create
// one of our channels, AsyncChannel et al.
void
GeckoChildProcessHost::OnMessageReceived(const IPC::Message& aMsg)
{
}
void
GeckoChildProcessHost::OnChannelError()
{
// XXXbent Notify that the child process is gone?
}
void
GeckoChildProcessHost::OnWaitableEventSignaled(base::WaitableEvent *event)
{
if (mDelegate) {
mDelegate->OnWaitableEventSignaled(event);
}
ChildProcessHost::OnWaitableEventSignaled(event);
}
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