| /* |
| * Copyright (C) 2010 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "Connection.h" |
| |
| #include "ArgumentEncoder.h" |
| #include "WorkItem.h" |
| #include <wtf/RandomNumber.h> |
| #include <wtf/text/WTFString.h> |
| |
| using namespace std; |
| // We explicitly don't use the WebCore namespace here because CoreIPC should only use WTF types and |
| // WTF::String is really in WTF. |
| using WTF::String; |
| |
| namespace CoreIPC { |
| |
| // FIXME: Rename this or use a different constant on windows. |
| static const size_t inlineMessageMaxSize = 4096; |
| |
| bool Connection::createServerAndClientIdentifiers(HANDLE& serverIdentifier, HANDLE& clientIdentifier) |
| { |
| String pipeName; |
| |
| while (true) { |
| unsigned uniqueID = randomNumber() * std::numeric_limits<unsigned>::max(); |
| pipeName = String::format("\\\\.\\pipe\\com.apple.WebKit.%x", uniqueID); |
| |
| serverIdentifier = ::CreateNamedPipe(pipeName.charactersWithNullTermination(), |
| PIPE_ACCESS_DUPLEX | FILE_FLAG_FIRST_PIPE_INSTANCE | FILE_FLAG_OVERLAPPED, |
| PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE, 1, inlineMessageMaxSize, inlineMessageMaxSize, |
| 0, 0); |
| if (!serverIdentifier && ::GetLastError() == ERROR_PIPE_BUSY) { |
| // There was already a pipe with this name, try again. |
| continue; |
| } |
| |
| break; |
| } |
| |
| if (!serverIdentifier) |
| return false; |
| |
| clientIdentifier = ::CreateFileW(pipeName.charactersWithNullTermination(), GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0); |
| if (!clientIdentifier) { |
| ::CloseHandle(serverIdentifier); |
| return false; |
| } |
| |
| DWORD mode = PIPE_READMODE_MESSAGE; |
| if (!::SetNamedPipeHandleState(clientIdentifier, &mode, 0, 0)) { |
| ::CloseHandle(serverIdentifier); |
| ::CloseHandle(clientIdentifier); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| void Connection::platformInitialize(Identifier identifier) |
| { |
| memset(&m_readState, 0, sizeof(m_readState)); |
| m_readState.hEvent = ::CreateEventW(0, FALSE, FALSE, 0); |
| |
| memset(&m_writeState, 0, sizeof(m_writeState)); |
| m_writeState.hEvent = ::CreateEventW(0, FALSE, FALSE, 0); |
| |
| m_connectionPipe = identifier; |
| } |
| |
| void Connection::platformInvalidate() |
| { |
| if (m_connectionPipe == INVALID_HANDLE_VALUE) |
| return; |
| |
| m_isConnected = false; |
| |
| m_connectionQueue.unregisterAndCloseHandle(m_readState.hEvent); |
| m_readState.hEvent = 0; |
| |
| m_connectionQueue.unregisterAndCloseHandle(m_writeState.hEvent); |
| m_writeState.hEvent = 0; |
| |
| ::CloseHandle(m_connectionPipe); |
| m_connectionPipe = INVALID_HANDLE_VALUE; |
| } |
| |
| void Connection::readEventHandler() |
| { |
| if (m_connectionPipe == INVALID_HANDLE_VALUE) |
| return; |
| |
| while (true) { |
| // Check if we got some data. |
| DWORD numberOfBytesRead = 0; |
| if (!::GetOverlappedResult(m_connectionPipe, &m_readState, &numberOfBytesRead, FALSE)) { |
| DWORD error = ::GetLastError(); |
| |
| switch (error) { |
| case ERROR_BROKEN_PIPE: |
| connectionDidClose(); |
| return; |
| case ERROR_MORE_DATA: { |
| // Read the rest of the message out of the pipe. |
| |
| DWORD bytesToRead = 0; |
| if (!::PeekNamedPipe(m_connectionPipe, 0, 0, 0, 0, &bytesToRead)) { |
| DWORD error = ::GetLastError(); |
| if (error == ERROR_BROKEN_PIPE) { |
| connectionDidClose(); |
| return; |
| } |
| ASSERT_NOT_REACHED(); |
| return; |
| } |
| |
| // ::GetOverlappedResult told us there's more data. ::PeekNamedPipe shouldn't |
| // contradict it! |
| ASSERT(bytesToRead); |
| if (!bytesToRead) |
| break; |
| |
| m_readBuffer.grow(m_readBuffer.size() + bytesToRead); |
| if (!::ReadFile(m_connectionPipe, m_readBuffer.data() + numberOfBytesRead, bytesToRead, 0, &m_readState)) { |
| DWORD error = ::GetLastError(); |
| ASSERT_NOT_REACHED(); |
| return; |
| } |
| continue; |
| } |
| |
| // FIXME: We should figure out why we're getting this error. |
| case ERROR_IO_INCOMPLETE: |
| return; |
| default: |
| ASSERT_NOT_REACHED(); |
| } |
| } |
| |
| if (!m_readBuffer.isEmpty()) { |
| // We have a message, let's dispatch it. |
| |
| // The messageID is encoded at the end of the buffer. |
| // Note that we assume here that the message is the same size as m_readBuffer. We can |
| // assume this because we always size m_readBuffer to exactly match the size of the message, |
| // either when receiving ERROR_MORE_DATA from ::GetOverlappedResult above or when |
| // ::PeekNamedPipe tells us the size below. We never set m_readBuffer to a size larger |
| // than the message. |
| ASSERT(m_readBuffer.size() >= sizeof(MessageID)); |
| size_t realBufferSize = m_readBuffer.size() - sizeof(MessageID); |
| |
| unsigned messageID = *reinterpret_cast<unsigned*>(m_readBuffer.data() + realBufferSize); |
| |
| processIncomingMessage(MessageID::fromInt(messageID), adoptPtr(new ArgumentDecoder(m_readBuffer.data(), realBufferSize))); |
| } |
| |
| // Find out the size of the next message in the pipe (if there is one) so that we can read |
| // it all in one operation. (This is just an optimization to avoid an extra pass through the |
| // loop (if we chose a buffer size that was too small) or allocating extra memory (if we |
| // chose a buffer size that was too large).) |
| DWORD bytesToRead = 0; |
| if (!::PeekNamedPipe(m_connectionPipe, 0, 0, 0, 0, &bytesToRead)) { |
| DWORD error = ::GetLastError(); |
| if (error == ERROR_BROKEN_PIPE) { |
| connectionDidClose(); |
| return; |
| } |
| ASSERT_NOT_REACHED(); |
| } |
| if (!bytesToRead) { |
| // There's no message waiting in the pipe. Schedule a read of the first byte of the |
| // next message. We'll find out the message's actual size when it arrives. (If we |
| // change this to read more than a single byte for performance reasons, we'll have to |
| // deal with m_readBuffer potentially being larger than the message we read after |
| // calling ::GetOverlappedResult above.) |
| bytesToRead = 1; |
| } |
| |
| m_readBuffer.resize(bytesToRead); |
| |
| // Either read the next available message (which should occur synchronously), or start an |
| // asynchronous read of the next message that becomes available. |
| BOOL result = ::ReadFile(m_connectionPipe, m_readBuffer.data(), m_readBuffer.size(), 0, &m_readState); |
| if (result) { |
| // There was already a message waiting in the pipe, and we read it synchronously. |
| // Process it. |
| continue; |
| } |
| |
| DWORD error = ::GetLastError(); |
| |
| if (error == ERROR_IO_PENDING) { |
| // There are no messages in the pipe currently. readEventHandler will be called again once there is a message. |
| return; |
| } |
| |
| if (error == ERROR_MORE_DATA) { |
| // Either a message is available when we didn't think one was, or the message is larger |
| // than ::PeekNamedPipe told us. The former seems far more likely. Probably the message |
| // became available between our calls to ::PeekNamedPipe and ::ReadFile above. Go back |
| // to the top of the loop to use ::GetOverlappedResult to retrieve the available data. |
| continue; |
| } |
| |
| // FIXME: We need to handle other errors here. |
| ASSERT_NOT_REACHED(); |
| } |
| } |
| |
| void Connection::writeEventHandler() |
| { |
| if (m_connectionPipe == INVALID_HANDLE_VALUE) |
| return; |
| |
| DWORD numberOfBytesWritten = 0; |
| if (!::GetOverlappedResult(m_connectionPipe, &m_writeState, &numberOfBytesWritten, FALSE)) { |
| DWORD error = ::GetLastError(); |
| if (error == ERROR_IO_INCOMPLETE) { |
| // FIXME: We should figure out why we're getting this error. |
| return; |
| } |
| if (error == ERROR_BROKEN_PIPE) { |
| connectionDidClose(); |
| return; |
| } |
| ASSERT_NOT_REACHED(); |
| } |
| |
| // The pending write has finished, so we are now done with its arguments. Clearing this member |
| // will allow us to send messages again. |
| m_pendingWriteArguments = 0; |
| |
| // Now that the pending write has finished, we can try to send a new message. |
| sendOutgoingMessages(); |
| } |
| |
| bool Connection::open() |
| { |
| // We connected the two ends of the pipe in createServerAndClientIdentifiers. |
| m_isConnected = true; |
| |
| // Start listening for read and write state events. |
| m_connectionQueue.registerHandle(m_readState.hEvent, WorkItem::create(this, &Connection::readEventHandler)); |
| m_connectionQueue.registerHandle(m_writeState.hEvent, WorkItem::create(this, &Connection::writeEventHandler)); |
| |
| // Schedule a read. |
| m_connectionQueue.scheduleWork(WorkItem::create(this, &Connection::readEventHandler)); |
| |
| return true; |
| } |
| |
| bool Connection::platformCanSendOutgoingMessages() const |
| { |
| // We only allow sending one asynchronous message at a time. If we wanted to send more than one |
| // at once, we'd have to use multiple OVERLAPPED structures and hold onto multiple pending |
| // ArgumentEncoders (one of each for each simultaneous asynchronous message). |
| return !m_pendingWriteArguments; |
| } |
| |
| bool Connection::sendOutgoingMessage(MessageID messageID, PassOwnPtr<ArgumentEncoder> arguments) |
| { |
| ASSERT(!m_pendingWriteArguments); |
| |
| // Just bail if the handle has been closed. |
| if (m_connectionPipe == INVALID_HANDLE_VALUE) |
| return false; |
| |
| // We put the message ID last. |
| arguments->encodeUInt32(messageID.toInt()); |
| |
| // Write the outgoing message. |
| |
| if (::WriteFile(m_connectionPipe, arguments->buffer(), arguments->bufferSize(), 0, &m_writeState)) { |
| // We successfully sent this message. |
| return true; |
| } |
| |
| DWORD error = ::GetLastError(); |
| |
| if (error == ERROR_NO_DATA) { |
| // The pipe is being closed. |
| connectionDidClose(); |
| return false; |
| } |
| |
| if (error != ERROR_IO_PENDING) { |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| |
| // The message will be sent soon. Hold onto the arguments so that they won't be destroyed |
| // before the write completes. |
| m_pendingWriteArguments = arguments; |
| |
| // We can only send one asynchronous message at a time (see comment in platformCanSendOutgoingMessages). |
| return false; |
| } |
| |
| } // namespace CoreIPC |