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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "MiniShmChild.h"
#include <limits>
#include <sstream>
namespace mozilla {
namespace plugins {
MiniShmChild::MiniShmChild()
: mParentEvent(nullptr),
mParentGuard(nullptr),
mChildEvent(nullptr),
mChildGuard(nullptr),
mFileMapping(nullptr),
mRegWait(nullptr),
mView(nullptr),
mTimeout(INFINITE)
{}
MiniShmChild::~MiniShmChild()
{
if (mRegWait) {
::UnregisterWaitEx(mRegWait, INVALID_HANDLE_VALUE);
}
if (mParentGuard) {
// Try to avoid shutting down while the parent's event handler is running.
::WaitForSingleObject(mParentGuard, mTimeout);
::CloseHandle(mParentGuard);
}
if (mParentEvent) {
::CloseHandle(mParentEvent);
}
if (mChildEvent) {
::CloseHandle(mChildEvent);
}
if (mChildGuard) {
::CloseHandle(mChildGuard);
}
if (mView) {
::UnmapViewOfFile(mView);
}
if (mFileMapping) {
::CloseHandle(mFileMapping);
}
}
nsresult
MiniShmChild::Init(MiniShmObserver* aObserver, const std::wstring& aCookie,
const DWORD aTimeout)
{
if (aCookie.empty() || !aTimeout) {
return NS_ERROR_ILLEGAL_VALUE;
}
if (mFileMapping) {
return NS_ERROR_ALREADY_INITIALIZED;
}
std::wistringstream iss(aCookie);
HANDLE mapHandle = nullptr;
iss >> mapHandle;
if (!iss) {
return NS_ERROR_ILLEGAL_VALUE;
}
ScopedMappedFileView view(::MapViewOfFile(mapHandle,
FILE_MAP_WRITE,
0, 0, 0));
if (!view.IsValid()) {
return NS_ERROR_FAILURE;
}
MEMORY_BASIC_INFORMATION memInfo = {0};
SIZE_T querySize = ::VirtualQuery(view, &memInfo, sizeof(memInfo));
unsigned int mappingSize = 0;
if (querySize) {
if (memInfo.RegionSize <= std::numeric_limits<unsigned int>::max()) {
mappingSize = static_cast<unsigned int>(memInfo.RegionSize);
}
}
if (!querySize || !mappingSize) {
return NS_ERROR_FAILURE;
}
nsresult rv = SetView(view, mappingSize, true);
if (NS_FAILED(rv)) {
return rv;
}
const MiniShmInit* initStruct = nullptr;
rv = GetReadPtr(initStruct);
if (NS_FAILED(rv)) {
return rv;
}
if (!initStruct->mParentEvent || !initStruct->mParentGuard ||
!initStruct->mChildEvent || !initStruct->mChildGuard) {
return NS_ERROR_FAILURE;
}
rv = SetGuard(initStruct->mParentGuard, aTimeout);
if (NS_FAILED(rv)) {
return rv;
}
if (!::RegisterWaitForSingleObject(&mRegWait,
initStruct->mChildEvent,
&SOnEvent,
this,
INFINITE,
WT_EXECUTEDEFAULT)) {
return NS_ERROR_FAILURE;
}
MiniShmInitComplete* initCompleteStruct = nullptr;
rv = GetWritePtrInternal(initCompleteStruct);
if (NS_FAILED(rv)) {
::UnregisterWaitEx(mRegWait, INVALID_HANDLE_VALUE);
mRegWait = nullptr;
return NS_ERROR_FAILURE;
}
initCompleteStruct->mSucceeded = true;
// We must set the member variables before we signal the event
mFileMapping = mapHandle;
mView = view.Take();
mParentEvent = initStruct->mParentEvent;
mParentGuard = initStruct->mParentGuard;
mChildEvent = initStruct->mChildEvent;
mChildGuard = initStruct->mChildGuard;
SetObserver(aObserver);
mTimeout = aTimeout;
rv = Send();
if (NS_FAILED(rv)) {
initCompleteStruct->mSucceeded = false;
mFileMapping = nullptr;
view.Set(mView);
mView = nullptr;
mParentEvent = nullptr;
mParentGuard = nullptr;
mChildEvent = nullptr;
mChildGuard = nullptr;
::UnregisterWaitEx(mRegWait, INVALID_HANDLE_VALUE);
mRegWait = nullptr;
return rv;
}
OnConnect();
return NS_OK;
}
nsresult
MiniShmChild::Send()
{
if (!mParentEvent) {
return NS_ERROR_NOT_INITIALIZED;
}
if (!::SetEvent(mParentEvent)) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
void
MiniShmChild::OnEvent()
{
MiniShmBase::OnEvent();
::SetEvent(mChildGuard);
}
} // namespace plugins
} // namespace mozilla
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