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Diffstat (limited to 'src/network/socket/qlocalsocket_win.cpp')
| -rw-r--r-- | src/network/socket/qlocalsocket_win.cpp | 633 |
1 files changed, 633 insertions, 0 deletions
diff --git a/src/network/socket/qlocalsocket_win.cpp b/src/network/socket/qlocalsocket_win.cpp new file mode 100644 index 0000000000..185f57481a --- /dev/null +++ b/src/network/socket/qlocalsocket_win.cpp @@ -0,0 +1,633 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtNetwork module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qlocalsocket_p.h" + +#include <private/qthread_p.h> +#include <qcoreapplication.h> +#include <qdebug.h> + +QT_BEGIN_NAMESPACE + +void QLocalSocketPrivate::init() +{ + Q_Q(QLocalSocket); + memset(&overlapped, 0, sizeof(overlapped)); + overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL); + dataReadNotifier = new QWinEventNotifier(overlapped.hEvent, q); + q->connect(dataReadNotifier, SIGNAL(activated(HANDLE)), q, SLOT(_q_notified())); +} + +void QLocalSocketPrivate::setErrorString(const QString &function) +{ + Q_Q(QLocalSocket); + BOOL windowsError = GetLastError(); + QLocalSocket::LocalSocketState currentState = state; + + // If the connectToServer fails due to WaitNamedPipe() time-out, assume ConnectionError + if (state == QLocalSocket::ConnectingState && windowsError == ERROR_SEM_TIMEOUT) + windowsError = ERROR_NO_DATA; + + switch (windowsError) { + case ERROR_PIPE_NOT_CONNECTED: + case ERROR_BROKEN_PIPE: + case ERROR_NO_DATA: + error = QLocalSocket::ConnectionError; + errorString = QLocalSocket::tr("%1: Connection error").arg(function); + state = QLocalSocket::UnconnectedState; + break; + case ERROR_FILE_NOT_FOUND: + error = QLocalSocket::ServerNotFoundError; + errorString = QLocalSocket::tr("%1: Invalid name").arg(function); + state = QLocalSocket::UnconnectedState; + break; + case ERROR_ACCESS_DENIED: + error = QLocalSocket::SocketAccessError; + errorString = QLocalSocket::tr("%1: Access denied").arg(function); + state = QLocalSocket::UnconnectedState; + break; + default: + error = QLocalSocket::UnknownSocketError; + errorString = QLocalSocket::tr("%1: Unknown error %2").arg(function).arg(windowsError); +#if defined QLOCALSOCKET_DEBUG + qWarning() << "QLocalSocket error not handled:" << errorString; +#endif + state = QLocalSocket::UnconnectedState; + } + + if (currentState != state) { + q->emit stateChanged(state); + if (state == QLocalSocket::UnconnectedState) + q->emit disconnected(); + } + emit q->error(error); +} + +QLocalSocketPrivate::QLocalSocketPrivate() : QIODevicePrivate(), + handle(INVALID_HANDLE_VALUE), + pipeWriter(0), + readBufferMaxSize(0), + actualReadBufferSize(0), + error(QLocalSocket::UnknownSocketError), + readSequenceStarted(false), + pendingReadyRead(false), + pipeClosed(false), + state(QLocalSocket::UnconnectedState) +{ +} + +QLocalSocketPrivate::~QLocalSocketPrivate() +{ + destroyPipeHandles(); + CloseHandle(overlapped.hEvent); +} + +void QLocalSocketPrivate::destroyPipeHandles() +{ + if (handle != INVALID_HANDLE_VALUE) { + DisconnectNamedPipe(handle); + CloseHandle(handle); + } +} + +void QLocalSocket::connectToServer(const QString &name, OpenMode openMode) +{ + Q_D(QLocalSocket); + if (state() == ConnectedState || state() == ConnectingState) + return; + + d->error = QLocalSocket::UnknownSocketError; + d->errorString = QString(); + d->state = ConnectingState; + emit stateChanged(d->state); + if (name.isEmpty()) { + d->error = QLocalSocket::ServerNotFoundError; + setErrorString(QLocalSocket::tr("%1: Invalid name").arg(QLatin1String("QLocalSocket::connectToServer"))); + d->state = UnconnectedState; + emit error(d->error); + emit stateChanged(d->state); + return; + } + + QString pipePath = QLatin1String("\\\\.\\pipe\\"); + if (name.startsWith(pipePath)) + d->fullServerName = name; + else + d->fullServerName = pipePath + name; + // Try to open a named pipe + HANDLE localSocket; + forever { + DWORD permissions = (openMode & QIODevice::ReadOnly) ? GENERIC_READ : 0; + permissions |= (openMode & QIODevice::WriteOnly) ? GENERIC_WRITE : 0; + localSocket = CreateFile((const wchar_t *)d->fullServerName.utf16(), // pipe name + permissions, + 0, // no sharing + NULL, // default security attributes + OPEN_EXISTING, // opens existing pipe + FILE_FLAG_OVERLAPPED, + NULL); // no template file + + if (localSocket != INVALID_HANDLE_VALUE) + break; + DWORD error = GetLastError(); + // It is really an error only if it is not ERROR_PIPE_BUSY + if (ERROR_PIPE_BUSY != error) { + break; + } + + // All pipe instances are busy, so wait until connected or up to 5 seconds. + if (!WaitNamedPipe((const wchar_t *)d->fullServerName.utf16(), 5000)) + break; + } + + if (localSocket == INVALID_HANDLE_VALUE) { + d->setErrorString(QLatin1String("QLocalSocket::connectToServer")); + d->fullServerName = QString(); + return; + } + + // we have a valid handle + d->serverName = name; + if (setSocketDescriptor((quintptr)localSocket, ConnectedState, openMode)) { + d->handle = localSocket; + emit connected(); + } +} + +// This is reading from the buffer +qint64 QLocalSocket::readData(char *data, qint64 maxSize) +{ + Q_D(QLocalSocket); + + if (d->pipeClosed && d->actualReadBufferSize == 0) + return -1; // signal EOF + + qint64 readSoFar; + // If startAsyncRead() read data, copy it to its destination. + if (maxSize == 1 && d->actualReadBufferSize > 0) { + *data = d->readBuffer.getChar(); + d->actualReadBufferSize--; + readSoFar = 1; + } else { + qint64 bytesToRead = qMin(qint64(d->actualReadBufferSize), maxSize); + readSoFar = 0; + while (readSoFar < bytesToRead) { + const char *ptr = d->readBuffer.readPointer(); + int bytesToReadFromThisBlock = qMin(bytesToRead - readSoFar, + qint64(d->readBuffer.nextDataBlockSize())); + memcpy(data + readSoFar, ptr, bytesToReadFromThisBlock); + readSoFar += bytesToReadFromThisBlock; + d->readBuffer.free(bytesToReadFromThisBlock); + d->actualReadBufferSize -= bytesToReadFromThisBlock; + } + } + + if (d->pipeClosed) { + if (d->actualReadBufferSize == 0) + QTimer::singleShot(0, this, SLOT(_q_pipeClosed())); + } else { + if (!d->readSequenceStarted) + d->startAsyncRead(); + d->checkReadyRead(); + } + + return readSoFar; +} + +/*! + \internal + Schedules or cancels a readyRead() emission depending on actual data availability + */ +void QLocalSocketPrivate::checkReadyRead() +{ + if (actualReadBufferSize > 0) { + if (!pendingReadyRead) { + Q_Q(QLocalSocket); + QTimer::singleShot(0, q, SLOT(_q_emitReadyRead())); + pendingReadyRead = true; + } + } else { + pendingReadyRead = false; + } +} + +/*! + \internal + Reads data from the socket into the readbuffer + */ +void QLocalSocketPrivate::startAsyncRead() +{ + do { + DWORD bytesToRead = checkPipeState(); + if (pipeClosed) + return; + + if (bytesToRead == 0) { + // There are no bytes in the pipe but we need to + // start the overlapped read with some buffer size. + bytesToRead = initialReadBufferSize; + } + + if (readBufferMaxSize && bytesToRead > (readBufferMaxSize - readBuffer.size())) { + bytesToRead = readBufferMaxSize - readBuffer.size(); + if (bytesToRead == 0) { + // Buffer is full. User must read data from the buffer + // before we can read more from the pipe. + return; + } + } + + char *ptr = readBuffer.reserve(bytesToRead); + + readSequenceStarted = true; + if (ReadFile(handle, ptr, bytesToRead, NULL, &overlapped)) { + completeAsyncRead(); + } else { + switch (GetLastError()) { + case ERROR_IO_PENDING: + // This is not an error. We're getting notified, when data arrives. + return; + case ERROR_MORE_DATA: + // This is not an error. The synchronous read succeeded. + // We're connected to a message mode pipe and the message + // didn't fit into the pipe's system buffer. + completeAsyncRead(); + break; + case ERROR_PIPE_NOT_CONNECTED: + { + // It may happen, that the other side closes the connection directly + // after writing data. Then we must set the appropriate socket state. + pipeClosed = true; + Q_Q(QLocalSocket); + emit q->readChannelFinished(); + return; + } + default: + setErrorString(QLatin1String("QLocalSocketPrivate::startAsyncRead")); + return; + } + } + } while (!readSequenceStarted); +} + +/*! + \internal + Sets the correct size of the read buffer after a read operation. + Returns false, if an error occurred or the connection dropped. + */ +bool QLocalSocketPrivate::completeAsyncRead() +{ + ResetEvent(overlapped.hEvent); + readSequenceStarted = false; + + DWORD bytesRead; + if (!GetOverlappedResult(handle, &overlapped, &bytesRead, TRUE)) { + switch (GetLastError()) { + case ERROR_MORE_DATA: + // This is not an error. We're connected to a message mode + // pipe and the message didn't fit into the pipe's system + // buffer. We will read the remaining data in the next call. + break; + case ERROR_PIPE_NOT_CONNECTED: + return false; + default: + setErrorString(QLatin1String("QLocalSocketPrivate::completeAsyncRead")); + return false; + } + } + + actualReadBufferSize += bytesRead; + readBuffer.truncate(actualReadBufferSize); + return true; +} + +qint64 QLocalSocket::writeData(const char *data, qint64 maxSize) +{ + Q_D(QLocalSocket); + if (!d->pipeWriter) { + d->pipeWriter = new QWindowsPipeWriter(d->handle, this); + connect(d->pipeWriter, SIGNAL(canWrite()), this, SLOT(_q_canWrite())); + connect(d->pipeWriter, SIGNAL(bytesWritten(qint64)), this, SIGNAL(bytesWritten(qint64))); + d->pipeWriter->start(); + } + return d->pipeWriter->write(data, maxSize); +} + +void QLocalSocket::abort() +{ + Q_D(QLocalSocket); + if (d->pipeWriter) { + delete d->pipeWriter; + d->pipeWriter = 0; + } + close(); +} + +/*! + \internal + Returns the number of available bytes in the pipe. + Sets QLocalSocketPrivate::pipeClosed to true if the connection is broken. + */ +DWORD QLocalSocketPrivate::checkPipeState() +{ + Q_Q(QLocalSocket); + DWORD bytes; + if (PeekNamedPipe(handle, NULL, 0, NULL, &bytes, NULL)) { + return bytes; + } else { + if (!pipeClosed) { + pipeClosed = true; + emit q->readChannelFinished(); + if (actualReadBufferSize == 0) + QTimer::singleShot(0, q, SLOT(_q_pipeClosed())); + } + } + return 0; +} + +void QLocalSocketPrivate::_q_pipeClosed() +{ + Q_Q(QLocalSocket); + q->close(); +} + +qint64 QLocalSocket::bytesAvailable() const +{ + Q_D(const QLocalSocket); + qint64 available = QIODevice::bytesAvailable(); + available += (qint64) d->actualReadBufferSize; + return available; +} + +qint64 QLocalSocket::bytesToWrite() const +{ + Q_D(const QLocalSocket); + return (d->pipeWriter) ? d->pipeWriter->bytesToWrite() : 0; +} + +bool QLocalSocket::canReadLine() const +{ + Q_D(const QLocalSocket); + if (state() != ConnectedState) + return false; + return (QIODevice::canReadLine() + || d->readBuffer.indexOf('\n', d->actualReadBufferSize) != -1); +} + +void QLocalSocket::close() +{ + Q_D(QLocalSocket); + if (state() == UnconnectedState) + return; + + QIODevice::close(); + d->state = ClosingState; + emit stateChanged(d->state); + if (!d->pipeClosed) + emit readChannelFinished(); + d->serverName = QString(); + d->fullServerName = QString(); + + if (state() != UnconnectedState && bytesToWrite() > 0) { + disconnectFromServer(); + return; + } + d->readSequenceStarted = false; + d->pendingReadyRead = false; + d->pipeClosed = false; + d->destroyPipeHandles(); + d->handle = INVALID_HANDLE_VALUE; + ResetEvent(d->overlapped.hEvent); + d->state = UnconnectedState; + emit stateChanged(d->state); + emit disconnected(); + if (d->pipeWriter) { + delete d->pipeWriter; + d->pipeWriter = 0; + } +} + +bool QLocalSocket::flush() +{ + Q_D(QLocalSocket); + if (d->pipeWriter) + return d->pipeWriter->waitForWrite(0); + return false; +} + +void QLocalSocket::disconnectFromServer() +{ + Q_D(QLocalSocket); + + // Are we still connected? + if (!isValid()) { + // If we have unwritten data, the pipeWriter is still present. + // It must be destroyed before close() to prevent an infinite loop. + delete d->pipeWriter; + d->pipeWriter = 0; + } + + flush(); + if (d->pipeWriter && d->pipeWriter->bytesToWrite() != 0) { + d->state = QLocalSocket::ClosingState; + emit stateChanged(d->state); + } else { + close(); + } +} + +QLocalSocket::LocalSocketError QLocalSocket::error() const +{ + Q_D(const QLocalSocket); + return d->error; +} + +bool QLocalSocket::setSocketDescriptor(quintptr socketDescriptor, + LocalSocketState socketState, OpenMode openMode) +{ + Q_D(QLocalSocket); + d->readBuffer.clear(); + d->actualReadBufferSize = 0; + QIODevice::open(openMode); + d->handle = (int*)socketDescriptor; + d->state = socketState; + emit stateChanged(d->state); + if (d->state == ConnectedState && openMode.testFlag(QIODevice::ReadOnly)) { + d->startAsyncRead(); + d->checkReadyRead(); + } + return true; +} + +void QLocalSocketPrivate::_q_canWrite() +{ + Q_Q(QLocalSocket); + if (state == QLocalSocket::ClosingState) + q->close(); +} + +void QLocalSocketPrivate::_q_notified() +{ + Q_Q(QLocalSocket); + if (!completeAsyncRead()) { + pipeClosed = true; + emit q->readChannelFinished(); + if (actualReadBufferSize == 0) + QTimer::singleShot(0, q, SLOT(_q_pipeClosed())); + return; + } + startAsyncRead(); + pendingReadyRead = false; + emit q->readyRead(); +} + +void QLocalSocketPrivate::_q_emitReadyRead() +{ + if (pendingReadyRead) { + Q_Q(QLocalSocket); + pendingReadyRead = false; + emit q->readyRead(); + } +} + +quintptr QLocalSocket::socketDescriptor() const +{ + Q_D(const QLocalSocket); + return (quintptr)d->handle; +} + +qint64 QLocalSocket::readBufferSize() const +{ + Q_D(const QLocalSocket); + return d->readBufferMaxSize; +} + +void QLocalSocket::setReadBufferSize(qint64 size) +{ + Q_D(QLocalSocket); + d->readBufferMaxSize = size; +} + +bool QLocalSocket::waitForConnected(int msecs) +{ + Q_UNUSED(msecs); + return (state() == ConnectedState); +} + +bool QLocalSocket::waitForDisconnected(int msecs) +{ + Q_D(QLocalSocket); + if (state() == UnconnectedState) + return false; + if (!openMode().testFlag(QIODevice::ReadOnly)) { + qWarning("QLocalSocket::waitForDisconnected isn't supported for write only pipes."); + return false; + } + QIncrementalSleepTimer timer(msecs); + forever { + d->checkPipeState(); + if (d->pipeClosed) + close(); + if (state() == UnconnectedState) + return true; + Sleep(timer.nextSleepTime()); + if (timer.hasTimedOut()) + break; + } + + return false; +} + +bool QLocalSocket::isValid() const +{ + Q_D(const QLocalSocket); + return d->handle != INVALID_HANDLE_VALUE; +} + +bool QLocalSocket::waitForReadyRead(int msecs) +{ + Q_D(QLocalSocket); + + if (bytesAvailable() > 0) + return true; + + if (d->state != QLocalSocket::ConnectedState) + return false; + + // We already know that the pipe is gone, but did not enter the event loop yet. + if (d->pipeClosed) { + close(); + return false; + } + + Q_ASSERT(d->readSequenceStarted); + DWORD result = WaitForSingleObject(d->overlapped.hEvent, msecs == -1 ? INFINITE : msecs); + switch (result) { + case WAIT_OBJECT_0: + d->_q_notified(); + // We just noticed that the pipe is gone. + if (d->pipeClosed) { + close(); + return false; + } + return true; + case WAIT_TIMEOUT: + return false; + } + + qWarning("QLocalSocket::waitForReadyRead WaitForSingleObject failed with error code %d.", int(GetLastError())); + return false; +} + +bool QLocalSocket::waitForBytesWritten(int msecs) +{ + Q_D(const QLocalSocket); + if (!d->pipeWriter) + return false; + + // Wait for the pipe writer to acknowledge that it has + // written. This will succeed if either the pipe writer has + // already written the data, or if it manages to write data + // within the given timeout. + return d->pipeWriter->waitForWrite(msecs); +} + +QT_END_NAMESPACE |