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comparison: dom/plugins/ipc/MiniShmParent.cpp
dom/plugins/ipc/MiniShmParent.cpp
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* vim: set ts=2 et sw=2 tw=80: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #include "MiniShmParent.h" | |
| 8 | |
| 9 #include "base/scoped_handle.h" | |
| 10 | |
| 11 #include <sstream> | |
| 12 | |
| 13 namespace mozilla { | |
| 14 namespace plugins { | |
| 15 | |
| 16 // static | |
| 17 const unsigned int MiniShmParent::kDefaultMiniShmSectionSize = 0x1000; | |
| 18 | |
| 19 MiniShmParent::MiniShmParent() | |
| 20 : mSectionSize(0), | |
| 21 mParentEvent(nullptr), | |
| 22 mParentGuard(nullptr), | |
| 23 mChildEvent(nullptr), | |
| 24 mChildGuard(nullptr), | |
| 25 mRegWait(nullptr), | |
| 26 mFileMapping(nullptr), | |
| 27 mView(nullptr), | |
| 28 mIsConnected(false), | |
| 29 mTimeout(INFINITE) | |
| 30 { | |
| 31 } | |
| 32 | |
| 33 MiniShmParent::~MiniShmParent() | |
| 34 { | |
| 35 CleanUp(); | |
| 36 } | |
| 37 | |
| 38 void | |
| 39 MiniShmParent::CleanUp() | |
| 40 { | |
| 41 if (mRegWait) { | |
| 42 ::UnregisterWaitEx(mRegWait, INVALID_HANDLE_VALUE); | |
| 43 mRegWait = nullptr; | |
| 44 } | |
| 45 if (mParentEvent) { | |
| 46 ::CloseHandle(mParentEvent); | |
| 47 mParentEvent = nullptr; | |
| 48 } | |
| 49 if (mParentGuard) { | |
| 50 ::CloseHandle(mParentGuard); | |
| 51 mParentGuard = nullptr; | |
| 52 } | |
| 53 if (mChildEvent) { | |
| 54 ::CloseHandle(mChildEvent); | |
| 55 mChildEvent = nullptr; | |
| 56 } | |
| 57 if (mChildGuard) { | |
| 58 ::CloseHandle(mChildGuard); | |
| 59 mChildGuard = nullptr; | |
| 60 } | |
| 61 if (mView) { | |
| 62 ::UnmapViewOfFile(mView); | |
| 63 mView = nullptr; | |
| 64 } | |
| 65 if (mFileMapping) { | |
| 66 ::CloseHandle(mFileMapping); | |
| 67 mFileMapping = nullptr; | |
| 68 } | |
| 69 } | |
| 70 | |
| 71 nsresult | |
| 72 MiniShmParent::Init(MiniShmObserver* aObserver, const DWORD aTimeout, | |
| 73 const unsigned int aSectionSize) | |
| 74 { | |
| 75 if (!aObserver || !aSectionSize || (aSectionSize % 0x1000) || !aTimeout) { | |
| 76 return NS_ERROR_ILLEGAL_VALUE; | |
| 77 } | |
| 78 if (mFileMapping) { | |
| 79 return NS_ERROR_ALREADY_INITIALIZED; | |
| 80 } | |
| 81 SECURITY_ATTRIBUTES securityAttributes = {sizeof(securityAttributes), | |
| 82 nullptr, | |
| 83 TRUE}; | |
| 84 ScopedHandle parentEvent(::CreateEvent(&securityAttributes, | |
| 85 FALSE, | |
| 86 FALSE, | |
| 87 nullptr)); | |
| 88 if (!parentEvent.IsValid()) { | |
| 89 return NS_ERROR_FAILURE; | |
| 90 } | |
| 91 ScopedHandle parentGuard(::CreateEvent(&securityAttributes, | |
| 92 FALSE, | |
| 93 TRUE, | |
| 94 nullptr)); | |
| 95 if (!parentGuard.IsValid()) { | |
| 96 return NS_ERROR_FAILURE; | |
| 97 } | |
| 98 ScopedHandle childEvent(::CreateEvent(&securityAttributes, | |
| 99 FALSE, | |
| 100 FALSE, | |
| 101 nullptr)); | |
| 102 if (!childEvent.IsValid()) { | |
| 103 return NS_ERROR_FAILURE; | |
| 104 } | |
| 105 ScopedHandle childGuard(::CreateEvent(&securityAttributes, | |
| 106 FALSE, | |
| 107 TRUE, | |
| 108 nullptr)); | |
| 109 if (!childGuard.IsValid()) { | |
| 110 return NS_ERROR_FAILURE; | |
| 111 } | |
| 112 ScopedHandle mapping(::CreateFileMapping(INVALID_HANDLE_VALUE, | |
| 113 &securityAttributes, | |
| 114 PAGE_READWRITE, | |
| 115 0, | |
| 116 aSectionSize, | |
| 117 nullptr)); | |
| 118 if (!mapping.IsValid()) { | |
| 119 return NS_ERROR_FAILURE; | |
| 120 } | |
| 121 ScopedMappedFileView view(::MapViewOfFile(mapping, | |
| 122 FILE_MAP_WRITE, | |
| 123 0, 0, 0)); | |
| 124 if (!view.IsValid()) { | |
| 125 return NS_ERROR_FAILURE; | |
| 126 } | |
| 127 nsresult rv = SetView(view, aSectionSize, false); | |
| 128 NS_ENSURE_SUCCESS(rv, rv); | |
| 129 rv = SetGuard(childGuard, aTimeout); | |
| 130 NS_ENSURE_SUCCESS(rv, rv); | |
| 131 | |
| 132 MiniShmInit* initStruct = nullptr; | |
| 133 rv = GetWritePtrInternal(initStruct); | |
| 134 NS_ENSURE_SUCCESS(rv, rv); | |
| 135 initStruct->mParentEvent = parentEvent; | |
| 136 initStruct->mParentGuard = parentGuard; | |
| 137 initStruct->mChildEvent = childEvent; | |
| 138 initStruct->mChildGuard = childGuard; | |
| 139 | |
| 140 if (!::RegisterWaitForSingleObject(&mRegWait, | |
| 141 parentEvent, | |
| 142 &SOnEvent, | |
| 143 this, | |
| 144 INFINITE, | |
| 145 WT_EXECUTEDEFAULT)) { | |
| 146 return NS_ERROR_FAILURE; | |
| 147 } | |
| 148 | |
| 149 mParentEvent = parentEvent.Take(); | |
| 150 mParentGuard = parentGuard.Take(); | |
| 151 mChildEvent = childEvent.Take(); | |
| 152 mChildGuard = childGuard.Take(); | |
| 153 mFileMapping = mapping.Take(); | |
| 154 mView = view.Take(); | |
| 155 mSectionSize = aSectionSize; | |
| 156 SetObserver(aObserver); | |
| 157 mTimeout = aTimeout; | |
| 158 return NS_OK; | |
| 159 } | |
| 160 | |
| 161 nsresult | |
| 162 MiniShmParent::GetCookie(std::wstring& cookie) | |
| 163 { | |
| 164 if (!mFileMapping) { | |
| 165 return NS_ERROR_NOT_INITIALIZED; | |
| 166 } | |
| 167 std::wostringstream oss; | |
| 168 oss << mFileMapping; | |
| 169 if (!oss) { | |
| 170 return NS_ERROR_FAILURE; | |
| 171 } | |
| 172 cookie = oss.str(); | |
| 173 return NS_OK; | |
| 174 } | |
| 175 | |
| 176 nsresult | |
| 177 MiniShmParent::Send() | |
| 178 { | |
| 179 if (!mChildEvent) { | |
| 180 return NS_ERROR_NOT_INITIALIZED; | |
| 181 } | |
| 182 if (!::SetEvent(mChildEvent)) { | |
| 183 return NS_ERROR_FAILURE; | |
| 184 } | |
| 185 return NS_OK; | |
| 186 } | |
| 187 | |
| 188 bool | |
| 189 MiniShmParent::IsConnected() const | |
| 190 { | |
| 191 return mIsConnected; | |
| 192 } | |
| 193 | |
| 194 void | |
| 195 MiniShmParent::OnEvent() | |
| 196 { | |
| 197 if (mIsConnected) { | |
| 198 MiniShmBase::OnEvent(); | |
| 199 } else { | |
| 200 FinalizeConnection(); | |
| 201 } | |
| 202 ::SetEvent(mParentGuard); | |
| 203 } | |
| 204 | |
| 205 void | |
| 206 MiniShmParent::FinalizeConnection() | |
| 207 { | |
| 208 const MiniShmInitComplete* initCompleteStruct = nullptr; | |
| 209 nsresult rv = GetReadPtr(initCompleteStruct); | |
| 210 mIsConnected = NS_SUCCEEDED(rv) && initCompleteStruct->mSucceeded; | |
| 211 if (mIsConnected) { | |
| 212 OnConnect(); | |
| 213 } | |
| 214 } | |
| 215 | |
| 216 } // namespace plugins | |
| 217 } // namespace mozilla | |
| 218 |
