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|
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the tools applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "trkdevice.h"
#include "trkutils.h"
#include "trkutils_p.h"
#include <QtCore/QString>
#include <QtCore/QDebug>
#include <QtCore/QQueue>
#include <QtCore/QHash>
#include <QtCore/QMap>
#include <QtCore/QThread>
#include <QtCore/QMutex>
#include <QtCore/QWaitCondition>
#include <QtCore/QSharedPointer>
#include <QtCore/QScopedPointer>
#include <QtCore/QMetaType>
#ifdef Q_OS_WIN
# include <windows.h>
#else
# include <QtCore/QFile>
# include <stdio.h>
# include <sys/ioctl.h>
# include <sys/types.h>
# include <termios.h>
# include <errno.h>
# include <string.h>
# include <unistd.h>
/* Required headers for select() according to POSIX.1-2001 */
# include <sys/select.h>
/* Required headers for select() according to earlier standards:
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
*/
#endif
#ifdef Q_OS_WIN
// Format windows error from GetLastError() value:
// TODO: Use the one provided by the utils lib.
QString winErrorMessage(unsigned long error)
{
QString rc = QString::fromLatin1("#%1: ").arg(error);
ushort *lpMsgBuf;
const int len = FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER
| FORMAT_MESSAGE_FROM_SYSTEM
| FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, error, 0, (LPTSTR)&lpMsgBuf, 0, NULL);
if (len) {
rc = QString::fromUtf16(lpMsgBuf, len);
LocalFree(lpMsgBuf);
} else {
rc += QString::fromLatin1("<unknown error>");
}
return rc;
}
#endif
enum { verboseTrk = 0 };
static inline QString msgAccessingClosedDevice(const QString &msg)
{
return QString::fromLatin1("Error: Attempt to access device '%1', which is closed.").arg(msg);
}
namespace trk {
///////////////////////////////////////////////////////////////////////
//
// TrkMessage
//
///////////////////////////////////////////////////////////////////////
/* A message to be send to TRK, triggering a callback on receipt
* of the answer. */
struct TrkMessage
{
explicit TrkMessage(byte code = 0u, byte token = 0u,
TrkCallback callback = TrkCallback());
byte code;
byte token;
QByteArray data;
QVariant cookie;
TrkCallback callback;
};
TrkMessage::TrkMessage(byte c, byte t, TrkCallback cb) :
code(c),
token(t),
callback(cb)
{
}
QDebug operator<<(QDebug d, const TrkMessage &msg)
{
return d << "Message: Code: " << msg.code
<< " Token: " << msg.token << " " << msg.data.toHex();
}
} // namespace trk
Q_DECLARE_METATYPE(trk::TrkMessage)
Q_DECLARE_METATYPE(trk::TrkResult)
namespace trk {
///////////////////////////////////////////////////////////////////////
//
// TrkWriteQueue: Mixin class that manages a write queue of Trk messages.
// pendingMessage()/notifyWriteResult() should be called from a worked/timer
// that writes the messages. The class does not take precautions for multithreading.
// A no-op message is simply taken off the queue. The calling class
// can use the helper invokeNoopMessage() to trigger its callback.
//
///////////////////////////////////////////////////////////////////////
class TrkWriteQueue
{
Q_DISABLE_COPY(TrkWriteQueue)
public:
explicit TrkWriteQueue();
void clear();
// Enqueue messages.
void queueTrkMessage(byte code, TrkCallback callback,
const QByteArray &data, const QVariant &cookie);
void queueTrkInitialPing();
// Call this from the device read notification with the results.
void slotHandleResult(const TrkResult &result, QMutex *mutex = 0);
// pendingMessage() can be called periodically in a timer to retrieve
// the pending messages to be sent.
enum PendingMessageResult {
NoMessage, // No message in queue.
PendingMessage, /* There is a queued message. The calling class
* can write it out and use notifyWriteResult()
* to notify about the result. */
NoopMessageDequeued // A no-op message has been dequeued. see invokeNoopMessage().
};
PendingMessageResult pendingMessage(TrkMessage *message);
// Notify the queue about the success of the write operation
// after taking the pendingMessage off.
enum WriteResult {
WriteOk,
WriteFailedDiscard, // Discard failed message
WriteFailedKeep, // Keep failed message
};
void notifyWriteResult(WriteResult ok);
// Helper function that invokes the callback of a no-op message
static void invokeNoopMessage(trk::TrkMessage);
private:
typedef QMap<byte, TrkMessage> TokenMessageMap;
byte nextTrkWriteToken();
byte m_trkWriteToken;
QQueue<TrkMessage> m_trkWriteQueue;
TokenMessageMap m_writtenTrkMessages;
bool m_trkWriteBusy;
};
TrkWriteQueue::TrkWriteQueue() :
m_trkWriteToken(0),
m_trkWriteBusy(false)
{
}
void TrkWriteQueue::clear()
{
m_trkWriteToken = 0;
m_trkWriteBusy = false;
m_trkWriteQueue.clear();
const int discarded = m_writtenTrkMessages.size();
m_writtenTrkMessages.clear();
if (verboseTrk)
qDebug() << "TrkWriteQueue::clear: discarded " << discarded;
}
byte TrkWriteQueue::nextTrkWriteToken()
{
++m_trkWriteToken;
if (m_trkWriteToken == 0)
++m_trkWriteToken;
if (verboseTrk)
qDebug() << "nextTrkWriteToken:" << m_trkWriteToken;
return m_trkWriteToken;
}
void TrkWriteQueue::queueTrkMessage(byte code, TrkCallback callback,
const QByteArray &data, const QVariant &cookie)
{
const byte token = code == TRK_WRITE_QUEUE_NOOP_CODE ?
byte(0) : nextTrkWriteToken();
TrkMessage msg(code, token, callback);
msg.data = data;
msg.cookie = cookie;
m_trkWriteQueue.append(msg);
}
TrkWriteQueue::PendingMessageResult TrkWriteQueue::pendingMessage(TrkMessage *message)
{
// Invoked from timer, try to flush out message queue
if (m_trkWriteBusy || m_trkWriteQueue.isEmpty())
return NoMessage;
// Handle the noop message, just invoke CB in slot (ower thread)
if (m_trkWriteQueue.front().code == TRK_WRITE_QUEUE_NOOP_CODE) {
*message = m_trkWriteQueue.dequeue();
return NoopMessageDequeued;
}
// Insert into map fir answers (as reading threads might get an
// answer before notifyWriteResult(true)) is called.
*message = m_trkWriteQueue.front();
m_writtenTrkMessages.insert(message->token, *message);
m_trkWriteBusy = true;
return PendingMessage;
}
void TrkWriteQueue::invokeNoopMessage(trk::TrkMessage noopMessage)
{
TrkResult result;
result.code = noopMessage.code;
result.token = noopMessage.token;
result.data = noopMessage.data;
result.cookie = noopMessage.cookie;
noopMessage.callback(result);
}
void TrkWriteQueue::notifyWriteResult(WriteResult wr)
{
// On success, dequeue message and await result
const byte token = m_trkWriteQueue.front().token;
switch (wr) {
case WriteOk:
m_trkWriteQueue.dequeue();
break;
case WriteFailedKeep:
case WriteFailedDiscard:
m_writtenTrkMessages.remove(token);
m_trkWriteBusy = false;
if (wr == WriteFailedDiscard)
m_trkWriteQueue.dequeue();
break;
}
}
void TrkWriteQueue::slotHandleResult(const TrkResult &result, QMutex *mutex)
{
// Find which request the message belongs to and invoke callback
// if ACK or on NAK if desired.
if (mutex)
mutex->lock();
m_trkWriteBusy = false;
const TokenMessageMap::iterator it = m_writtenTrkMessages.find(result.token);
if (it == m_writtenTrkMessages.end()) {
if (mutex)
mutex->unlock();
return;
}
TrkCallback callback = it.value().callback;
const QVariant cookie = it.value().cookie;
m_writtenTrkMessages.erase(it);
if (mutex)
mutex->unlock();
// Invoke callback
if (callback) {
TrkResult result1 = result;
result1.cookie = cookie;
callback(result1);
}
}
void TrkWriteQueue::queueTrkInitialPing()
{
// Ping, reset sequence count
m_trkWriteToken = 0;
m_trkWriteQueue.append(TrkMessage(TrkPing, 0));
}
///////////////////////////////////////////////////////////////////////
//
// DeviceContext to be shared between threads
//
///////////////////////////////////////////////////////////////////////
struct DeviceContext {
DeviceContext();
#ifdef Q_OS_WIN
HANDLE device;
OVERLAPPED readOverlapped;
OVERLAPPED writeOverlapped;
#else
QFile file;
#endif
bool serialFrame;
QMutex mutex;
};
DeviceContext::DeviceContext() :
#ifdef Q_OS_WIN
device(INVALID_HANDLE_VALUE),
#endif
serialFrame(true)
{
}
///////////////////////////////////////////////////////////////////////
//
// TrkWriterThread: A thread operating a TrkWriteQueue.
// with exception of the handling of the TRK_WRITE_QUEUE_NOOP_CODE
// synchronization message. The invocation of the callback is then
// done by the thread owning the TrkWriteQueue, while pendingMessage() is called
// from another thread. This happens via a Qt::BlockingQueuedConnection.
///////////////////////////////////////////////////////////////////////
class WriterThread : public QThread
{
Q_OBJECT
Q_DISABLE_COPY(WriterThread)
public:
explicit WriterThread(const QSharedPointer<DeviceContext> &context);
// Enqueue messages.
void queueTrkMessage(byte code, TrkCallback callback,
const QByteArray &data, const QVariant &cookie);
void queueTrkInitialPing();
void clearWriteQueue();
// Call this from the device read notification with the results.
void slotHandleResult(const TrkResult &result);
virtual void run();
signals:
void error(const QString &);
void internalNoopMessageDequeued(const trk::TrkMessage&);
public slots:
bool trkWriteRawMessage(const TrkMessage &msg);
void terminate();
void tryWrite();
private slots:
void invokeNoopMessage(const trk::TrkMessage &);
private:
bool write(const QByteArray &data, QString *errorMessage);
inline int writePendingMessage();
const QSharedPointer<DeviceContext> m_context;
QMutex m_dataMutex;
QMutex m_waitMutex;
QWaitCondition m_waitCondition;
TrkWriteQueue m_queue;
bool m_terminate;
};
WriterThread::WriterThread(const QSharedPointer<DeviceContext> &context) :
m_context(context),
m_terminate(false)
{
static const int trkMessageMetaId = qRegisterMetaType<trk::TrkMessage>();
Q_UNUSED(trkMessageMetaId)
connect(this, SIGNAL(internalNoopMessageDequeued(trk::TrkMessage)),
this, SLOT(invokeNoopMessage(trk::TrkMessage)), Qt::BlockingQueuedConnection);
}
void WriterThread::run()
{
while (writePendingMessage() == 0) ;
}
int WriterThread::writePendingMessage()
{
enum { MaxAttempts = 100, RetryIntervalMS = 200 };
// Wait. Use a timeout in case something is already queued before we
// start up or some weird hanging exit condition
m_waitMutex.lock();
m_waitCondition.wait(&m_waitMutex, 100);
m_waitMutex.unlock();
if (m_terminate)
return 1;
// Send off message
m_dataMutex.lock();
TrkMessage message;
const TrkWriteQueue::PendingMessageResult pr = m_queue.pendingMessage(&message);
m_dataMutex.unlock();
switch (pr) {
case TrkWriteQueue::NoMessage:
break;
case TrkWriteQueue::PendingMessage: {
//qDebug() << "Write pending message " << message;
// Untested: try to re-send a few times
bool success = false;
for (int r = 0; !success && (r < MaxAttempts); r++) {
success = trkWriteRawMessage(message);
if (!success) {
emit error(QString::fromLatin1("Write failure, attempt %1 of %2.").arg(r).arg(int(MaxAttempts)));
if (m_terminate)
return 1;
QThread::msleep(RetryIntervalMS);
}
}
// Notify queue. If still failed, give up.
m_dataMutex.lock();
m_queue.notifyWriteResult(success ? TrkWriteQueue::WriteOk : TrkWriteQueue::WriteFailedDiscard);
m_dataMutex.unlock();
}
break;
case TrkWriteQueue::NoopMessageDequeued:
// Sync with thread that owns us via a blocking signal
if (verboseTrk)
qDebug() << "Noop message dequeued" << message;
emit internalNoopMessageDequeued(message);
break;
} // switch
return 0;
}
void WriterThread::invokeNoopMessage(const trk::TrkMessage &msg)
{
TrkWriteQueue::invokeNoopMessage(msg);
}
void WriterThread::terminate()
{
m_terminate = true;
m_waitCondition.wakeAll();
wait();
m_terminate = false;
m_queue.clear();
}
#ifdef Q_OS_WIN
static inline QString msgTerminated(int size)
{
return QString::fromLatin1("Terminated with %1 bytes pending.").arg(size);
}
// Interruptible synchronous write function.
static inline bool overlappedSyncWrite(HANDLE file,
const bool &terminateFlag,
const char *data,
DWORD size, DWORD *charsWritten,
OVERLAPPED *overlapped,
QString *errorMessage)
{
if (WriteFile(file, data, size, charsWritten, overlapped))
return true;
const DWORD writeError = GetLastError();
if (writeError != ERROR_IO_PENDING) {
*errorMessage = QString::fromLatin1("WriteFile failed: %1").arg(winErrorMessage(writeError));
return false;
}
// Wait for written or thread terminated
const DWORD timeoutMS = 200;
const unsigned maxAttempts = 20;
DWORD wr = WaitForSingleObject(overlapped->hEvent, timeoutMS);
for (unsigned n = 0; wr == WAIT_TIMEOUT && n < maxAttempts && !terminateFlag;
wr = WaitForSingleObject(overlapped->hEvent, timeoutMS), n++);
if (terminateFlag) {
*errorMessage = msgTerminated(size);
return false;
}
switch (wr) {
case WAIT_OBJECT_0:
break;
case WAIT_TIMEOUT:
*errorMessage = QString::fromLatin1("Write timed out.");
return false;
default:
*errorMessage = QString::fromLatin1("Error while waiting for WriteFile results: %1").arg(winErrorMessage(GetLastError()));
return false;
}
if (!GetOverlappedResult(file, overlapped, charsWritten, TRUE)) {
*errorMessage = QString::fromLatin1("Error writing %1 bytes: %2").arg(size).arg(winErrorMessage(GetLastError()));
return false;
}
return true;
}
#endif
bool WriterThread::write(const QByteArray &data, QString *errorMessage)
{
if (verboseTrk)
qDebug() << "Write raw data: " << stringFromArray(data).toLatin1();
QMutexLocker locker(&m_context->mutex);
#ifdef Q_OS_WIN
DWORD charsWritten;
if (!overlappedSyncWrite(m_context->device, m_terminate, data.data(), data.size(), &charsWritten, &m_context->writeOverlapped, errorMessage)) {
return false;
}
FlushFileBuffers(m_context->device);
return true;
#else
if (m_context->file.write(data) == -1 || !m_context->file.flush()) {
*errorMessage = QString::fromLatin1("Cannot write: %1").arg(m_context->file.errorString());
return false;
}
return true;
#endif
}
bool WriterThread::trkWriteRawMessage(const TrkMessage &msg)
{
const QByteArray ba = frameMessage(msg.code, msg.token, msg.data, m_context->serialFrame);
QString errorMessage;
const bool rc = write(ba, &errorMessage);
if (!rc) {
qWarning("%s\n", qPrintable(errorMessage));
emit error(errorMessage);
}
return rc;
}
void WriterThread::tryWrite()
{
m_waitCondition.wakeAll();
}
void WriterThread::queueTrkMessage(byte code, TrkCallback callback,
const QByteArray &data, const QVariant &cookie)
{
m_dataMutex.lock();
m_queue.queueTrkMessage(code, callback, data, cookie);
m_dataMutex.unlock();
tryWrite();
}
void WriterThread::clearWriteQueue()
{
m_dataMutex.lock();
m_queue.clear();
m_dataMutex.unlock();
}
void WriterThread::queueTrkInitialPing()
{
m_dataMutex.lock();
m_queue.queueTrkInitialPing();
m_dataMutex.unlock();
tryWrite();
}
// Call this from the device read notification with the results.
void WriterThread::slotHandleResult(const TrkResult &result)
{
m_queue.slotHandleResult(result, &m_dataMutex);
tryWrite(); // Have messages been enqueued in-between?
}
///////////////////////////////////////////////////////////////////////
//
// ReaderThreadBase: Base class for a thread that reads data from
// the device, decodes the messages and emit signals for the messages.
// A Qt::BlockingQueuedConnection should be used for the message signal
// to ensure messages are processed in the correct sequence.
//
///////////////////////////////////////////////////////////////////////
class ReaderThreadBase : public QThread
{
Q_OBJECT
Q_DISABLE_COPY(ReaderThreadBase)
public:
int bytesPending() const { return m_trkReadBuffer.size(); }
signals:
void messageReceived(const trk::TrkResult &result, const QByteArray &rawData);
protected:
explicit ReaderThreadBase(const QSharedPointer<DeviceContext> &context);
void processData(const QByteArray &a);
void processData(char c);
const QSharedPointer<DeviceContext> m_context;
private:
void readMessages();
QByteArray m_trkReadBuffer;
bool linkEstablishmentMode;
};
ReaderThreadBase::ReaderThreadBase(const QSharedPointer<DeviceContext> &context) :
m_context(context), linkEstablishmentMode(true)
{
static const int trkResultMetaId = qRegisterMetaType<trk::TrkResult>();
Q_UNUSED(trkResultMetaId)
}
void ReaderThreadBase::processData(const QByteArray &a)
{
m_trkReadBuffer += a;
readMessages();
}
void ReaderThreadBase::processData(char c)
{
m_trkReadBuffer += c;
if (m_trkReadBuffer.size() > 1)
readMessages();
}
void ReaderThreadBase::readMessages()
{
TrkResult r;
QByteArray rawData;
while (extractResult(&m_trkReadBuffer, m_context->serialFrame, &r, linkEstablishmentMode, &rawData)) {
emit messageReceived(r, rawData);
}
}
#ifdef Q_OS_WIN
///////////////////////////////////////////////////////////////////////
//
// WinReaderThread: A thread reading from the device using Windows API.
// Waits on an overlapped I/O handle and an event that tells the thread to
// terminate.
//
///////////////////////////////////////////////////////////////////////
class WinReaderThread : public ReaderThreadBase
{
Q_OBJECT
Q_DISABLE_COPY(WinReaderThread)
public:
explicit WinReaderThread(const QSharedPointer<DeviceContext> &context);
~WinReaderThread();
virtual void run();
signals:
void error(const QString &);
public slots:
void terminate();
private:
enum Handles { TerminateEventHandle, FileHandle, HandleCount };
inline int tryRead();
HANDLE m_handles[HandleCount];
};
WinReaderThread::WinReaderThread(const QSharedPointer<DeviceContext> &context) :
ReaderThreadBase(context)
{
m_handles[FileHandle] = NULL;
m_handles[TerminateEventHandle] = CreateEvent(NULL, FALSE, FALSE, NULL);
}
WinReaderThread::~WinReaderThread()
{
CloseHandle(m_handles[TerminateEventHandle]);
}
// Return 0 to continue or error code
int WinReaderThread::tryRead()
{
enum { BufSize = 1024 };
char buffer[BufSize];
// Check if there are already bytes waiting. If not, wait for first byte
COMSTAT comStat;
if (!ClearCommError(m_context->device, NULL, &comStat)){
emit error(QString::fromLatin1("ClearCommError failed: %1").arg(winErrorMessage(GetLastError())));
return -7;
}
const DWORD bytesToRead = qMax(DWORD(1), qMin(comStat.cbInQue, DWORD(BufSize)));
// Trigger read
DWORD bytesRead = 0;
if (ReadFile(m_context->device, &buffer, bytesToRead, &bytesRead, &m_context->readOverlapped) && bytesRead > 0) {
if (bytesRead == 1) {
processData(buffer[0]);
} else {
processData(QByteArray(buffer, bytesRead));
}
return 0;
}
const DWORD readError = GetLastError();
if (readError != ERROR_IO_PENDING && readError != 0) {
emit error(QString::fromLatin1("Read error: %1").arg(winErrorMessage(readError)));
return -1;
}
// Wait for either termination or data
const DWORD wr = WaitForMultipleObjects(HandleCount, m_handles, false, INFINITE);
if (wr == WAIT_FAILED) {
emit error(QString::fromLatin1("Wait failed: %1").arg(winErrorMessage(GetLastError())));
return -2;
}
if (wr - WAIT_OBJECT_0 == TerminateEventHandle) {
return 1; // Terminate
}
// Check data
if (!GetOverlappedResult(m_context->device, &m_context->readOverlapped, &bytesRead, true)) {
emit error(QString::fromLatin1("GetOverlappedResult failed: %1").arg(winErrorMessage(GetLastError())));
return -3;
}
if (bytesRead == 1) {
processData(buffer[0]);
} else {
processData(QByteArray(buffer, bytesRead));
}
return 0;
}
void WinReaderThread::run()
{
m_handles[FileHandle] = m_context->readOverlapped.hEvent;
while ( tryRead() == 0) ;
}
void WinReaderThread::terminate()
{
SetEvent(m_handles[TerminateEventHandle]);
wait();
}
typedef WinReaderThread ReaderThread;
#else
///////////////////////////////////////////////////////////////////////
//
// UnixReaderThread: A thread reading from the device.
// Uses select() to wait and a special ioctl() to find out the number
// of bytes queued. For clean termination, the self-pipe trick is used.
// The class maintains a pipe, on whose read end the select waits besides
// the device file handle. To terminate, a byte is written to the pipe.
//
///////////////////////////////////////////////////////////////////////
static inline QString msgUnixCallFailedErrno(const char *func, int errorNumber)
{
return QString::fromLatin1("Call to %1() failed: %2").arg(QLatin1String(func), QString::fromLocal8Bit(strerror(errorNumber)));
}
class UnixReaderThread : public ReaderThreadBase {
Q_OBJECT
Q_DISABLE_COPY(UnixReaderThread)
public:
explicit UnixReaderThread(const QSharedPointer<DeviceContext> &context);
~UnixReaderThread();
virtual void run();
signals:
void error(const QString &);
public slots:
void terminate();
private:
inline int tryRead();
int m_terminatePipeFileDescriptors[2];
};
UnixReaderThread::UnixReaderThread(const QSharedPointer<DeviceContext> &context) :
ReaderThreadBase(context)
{
m_terminatePipeFileDescriptors[0] = m_terminatePipeFileDescriptors[1] = -1;
// Set up pipes for termination. Should not fail
if (pipe(m_terminatePipeFileDescriptors) < 0)
qWarning("%s\n", qPrintable(msgUnixCallFailedErrno("pipe", errno)));
}
UnixReaderThread::~UnixReaderThread()
{
close(m_terminatePipeFileDescriptors[0]);
close(m_terminatePipeFileDescriptors[1]);
}
int UnixReaderThread::tryRead()
{
fd_set readSet, tempReadSet, tempExceptionSet;
struct timeval timeOut;
const int fileDescriptor = m_context->file.handle();
FD_ZERO(&readSet);
FD_SET(fileDescriptor, &readSet);
FD_SET(m_terminatePipeFileDescriptors[0], &readSet);
const int maxFileDescriptor = qMax(m_terminatePipeFileDescriptors[0], fileDescriptor);
int result = 0;
do {
memcpy(&tempReadSet, &readSet, sizeof(fd_set));
memcpy(&tempExceptionSet, &readSet, sizeof(fd_set));
timeOut.tv_sec = 1;
timeOut.tv_usec = 0;
result = select(maxFileDescriptor + 1, &tempReadSet, NULL, &tempExceptionSet, &timeOut);
} while ( result < 0 && errno == EINTR );
// Timeout?
if (result == 0)
return 0;
// Something wrong?
if (result < 0) {
emit error(msgUnixCallFailedErrno("select", errno));
return -1;
}
// Did the exception set trigger on the device?
if (FD_ISSET(fileDescriptor,&tempExceptionSet)) {
emit error(QLatin1String("An Exception occurred on the device."));
return -2;
}
// Check termination pipe.
if (FD_ISSET(m_terminatePipeFileDescriptors[0], &tempReadSet)
|| FD_ISSET(m_terminatePipeFileDescriptors[0], &tempExceptionSet))
return 1;
// determine number of pending bytes and read
int numBytes;
if (ioctl(fileDescriptor, FIONREAD, &numBytes) < 0) {
emit error(msgUnixCallFailedErrno("ioctl", errno));
return -1;
}
m_context->mutex.lock();
const QByteArray data = m_context->file.read(numBytes);
m_context->mutex.unlock();
processData(data);
return 0;
}
void UnixReaderThread::run()
{
// Read loop
while (tryRead() == 0)
;
}
void UnixReaderThread::terminate()
{
// Trigger select() by writing to the pipe
char c = 0;
const int written = write(m_terminatePipeFileDescriptors[1], &c, 1);
Q_UNUSED(written)
wait();
}
typedef UnixReaderThread ReaderThread;
#endif
///////////////////////////////////////////////////////////////////////
//
// TrkDevicePrivate
//
///////////////////////////////////////////////////////////////////////
struct TrkDevicePrivate
{
TrkDevicePrivate();
QSharedPointer<DeviceContext> deviceContext;
QScopedPointer<WriterThread> writerThread;
QScopedPointer<ReaderThread> readerThread;
QByteArray trkReadBuffer;
int verbose;
QString errorString;
QString port;
};
///////////////////////////////////////////////////////////////////////
//
// TrkDevice
//
///////////////////////////////////////////////////////////////////////
TrkDevicePrivate::TrkDevicePrivate() :
deviceContext(new DeviceContext),
verbose(0)
{
}
///////////////////////////////////////////////////////////////////////
//
// TrkDevice
//
///////////////////////////////////////////////////////////////////////
TrkDevice::TrkDevice(QObject *parent) :
QObject(parent),
d(new TrkDevicePrivate)
{}
TrkDevice::~TrkDevice()
{
close();
delete d;
}
bool TrkDevice::open(QString *errorMessage)
{
if (d->verbose || verboseTrk)
qDebug() << "Opening" << port() << "is open: " << isOpen() << " serialFrame=" << serialFrame();
if (isOpen())
return true;
if (d->port.isEmpty()) {
*errorMessage = QLatin1String("Internal error: No port set on TrkDevice");
return false;
}
#ifdef Q_OS_WIN
const QString fullPort = QLatin1String("\\\\.\\") + d->port;
d->deviceContext->device = CreateFile(reinterpret_cast<const WCHAR*>(fullPort.utf16()),
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL|FILE_FLAG_NO_BUFFERING|FILE_FLAG_OVERLAPPED,
NULL);
if (INVALID_HANDLE_VALUE == d->deviceContext->device) {
*errorMessage = QString::fromLatin1("Could not open device '%1': %2").arg(port(), winErrorMessage(GetLastError()));
return false;
}
memset(&d->deviceContext->readOverlapped, 0, sizeof(OVERLAPPED));
d->deviceContext->readOverlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
memset(&d->deviceContext->writeOverlapped, 0, sizeof(OVERLAPPED));
d->deviceContext->writeOverlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (d->deviceContext->readOverlapped.hEvent == NULL || d->deviceContext->writeOverlapped.hEvent == NULL) {
*errorMessage = QString::fromLatin1("Failed to create events: %1").arg(winErrorMessage(GetLastError()));
return false;
}
#else
d->deviceContext->file.setFileName(d->port);
if (!d->deviceContext->file.open(QIODevice::ReadWrite|QIODevice::Unbuffered)) {
*errorMessage = QString::fromLatin1("Cannot open %1: %2").arg(d->port, d->deviceContext->file.errorString());
return false;
}
struct termios termInfo;
if (tcgetattr(d->deviceContext->file.handle(), &termInfo) < 0) {
*errorMessage = QString::fromLatin1("Unable to retrieve terminal settings: %1 %2").arg(errno).arg(QString::fromAscii(strerror(errno)));
return false;
}
// Turn off terminal echo as not get messages back, among other things
termInfo.c_cflag |= CREAD|CLOCAL;
termInfo.c_lflag &= (~(ICANON|ECHO|ECHOE|ECHOK|ECHONL|ISIG));
termInfo.c_iflag &= (~(INPCK|IGNPAR|PARMRK|ISTRIP|ICRNL|IXANY));
termInfo.c_oflag &= (~OPOST);
termInfo.c_cc[VMIN] = 0;
termInfo.c_cc[VINTR] = _POSIX_VDISABLE;
termInfo.c_cc[VQUIT] = _POSIX_VDISABLE;
termInfo.c_cc[VSTART] = _POSIX_VDISABLE;
termInfo.c_cc[VSTOP] = _POSIX_VDISABLE;
termInfo.c_cc[VSUSP] = _POSIX_VDISABLE;
if (tcsetattr(d->deviceContext->file.handle(), TCSAFLUSH, &termInfo) < 0) {
*errorMessage = QString::fromLatin1("Unable to apply terminal settings: %1 %2").arg(errno).arg(QString::fromAscii(strerror(errno)));
return false;
}
#endif
d->readerThread.reset(new ReaderThread(d->deviceContext));
connect(d->readerThread.data(), SIGNAL(error(QString)), this, SLOT(emitError(QString)),
Qt::QueuedConnection);
connect(d->readerThread.data(), SIGNAL(messageReceived(trk::TrkResult,QByteArray)),
this, SLOT(slotMessageReceived(trk::TrkResult,QByteArray)),
Qt::QueuedConnection);
d->readerThread->start();
d->writerThread.reset(new WriterThread(d->deviceContext));
connect(d->writerThread.data(), SIGNAL(error(QString)), this, SLOT(emitError(QString)),
Qt::QueuedConnection);
d->writerThread->start();
if (d->verbose || verboseTrk)
qDebug() << "Opened" << d->port << d->readerThread.data() << d->writerThread.data();
return true;
}
void TrkDevice::close()
{
if (verboseTrk)
qDebug() << "close" << d->port << " is open: " << isOpen()
<< " read pending " << (d->readerThread.isNull() ? 0 : d->readerThread->bytesPending())
<< sender();
if (!isOpen())
return;
if (d->readerThread)
d->readerThread->terminate();
if (d->writerThread)
d->writerThread->terminate();
#ifdef Q_OS_WIN
CloseHandle(d->deviceContext->device);
d->deviceContext->device = INVALID_HANDLE_VALUE;
CloseHandle(d->deviceContext->readOverlapped.hEvent);
CloseHandle(d->deviceContext->writeOverlapped.hEvent);
d->deviceContext->readOverlapped.hEvent = d->deviceContext->writeOverlapped.hEvent = NULL;
#else
d->deviceContext->file.close();
#endif
if (d->verbose)
emitLogMessage("Close");
}
bool TrkDevice::isOpen() const
{
#ifdef Q_OS_WIN
return d->deviceContext->device != INVALID_HANDLE_VALUE;
#else
return d->deviceContext->file.isOpen();
#endif
}
QString TrkDevice::port() const
{
return d->port;
}
void TrkDevice::setPort(const QString &p)
{
if (verboseTrk)
qDebug() << "setPort" << p;
d->port = p;
}
QString TrkDevice::errorString() const
{
return d->errorString;
}
bool TrkDevice::serialFrame() const
{
return d->deviceContext->serialFrame;
}
void TrkDevice::setSerialFrame(bool f)
{
if (verboseTrk)
qDebug() << "setSerialFrame" << f;
d->deviceContext->serialFrame = f;
}
int TrkDevice::verbose() const
{
return d->verbose;
}
void TrkDevice::setVerbose(int b)
{
d->verbose = b;
}
void TrkDevice::slotMessageReceived(const trk::TrkResult &result, const QByteArray &rawData)
{
if (isOpen()) { // Might receive bytes after closing due to queued connections.
d->writerThread->slotHandleResult(result);
if (d->verbose > 1)
qDebug() << "Received: " << result.toString();
emit messageReceived(result);
if (!rawData.isEmpty())
emit rawDataReceived(rawData);
}
}
void TrkDevice::emitError(const QString &s)
{
d->errorString = s;
qWarning("%s\n", qPrintable(s));
emit error(s);
}
void TrkDevice::clearWriteQueue()
{
if (isOpen())
d->writerThread->clearWriteQueue();
}
void TrkDevice::sendTrkMessage(byte code, TrkCallback callback,
const QByteArray &data, const QVariant &cookie)
{
if (!isOpen()) {
emitError(msgAccessingClosedDevice(d->port));
return;
}
if (!d->writerThread.isNull()) {
if (d->verbose > 1) {
QByteArray msg = "Sending: 0x";
msg += QByteArray::number(code, 16);
msg += ": ";
msg += stringFromArray(data).toLatin1();
if (cookie.isValid())
msg += " Cookie: " + cookie.toString().toLatin1();
qDebug("%s", msg.data());
}
d->writerThread->queueTrkMessage(code, callback, data, cookie);
}
}
void TrkDevice::sendTrkInitialPing()
{
if (!isOpen()) {
emitError(msgAccessingClosedDevice(d->port));
return;
}
if (!d->writerThread.isNull())
d->writerThread->queueTrkInitialPing();
}
bool TrkDevice::sendTrkAck(byte token)
{
if (!isOpen()) {
emitError(msgAccessingClosedDevice(d->port));
return false;
}
if (d->writerThread.isNull())
return false;
// The acknowledgement must not be queued!
TrkMessage msg(0x80, token);
msg.token = token;
msg.data.append('\0');
if (verboseTrk)
qDebug() << "Write synchroneous message: " << msg;
return d->writerThread->trkWriteRawMessage(msg);
// 01 90 00 07 7e 80 01 00 7d 5e 7e
}
void TrkDevice::emitLogMessage(const QString &msg)
{
if (d->verbose)
qDebug("%s\n", qPrintable(msg));
emit logMessage(msg);
}
} // namespace trk
#include "trkdevice.moc"
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