/**************************************************************************** ** ** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** This file is part of the QtNetwork module 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. ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ //#define QABSTRACTSOCKET_DEBUG /*! \class QAbstractSocket \brief The QAbstractSocket class provides the base functionality common to all socket types. \reentrant \ingroup io \inmodule QtNetwork QAbstractSocket is the base class for QTcpSocket and QUdpSocket and contains all common functionality of these two classes. If you need a socket, you have two options: \list \i Instantiate QTcpSocket or QUdpSocket. \i Create a native socket descriptor, instantiate QAbstractSocket, and call setSocketDescriptor() to wrap the native socket. \endlist TCP (Transmission Control Protocol) is a reliable, stream-oriented, connection-oriented transport protocol. UDP (User Datagram Protocol) is an unreliable, datagram-oriented, connectionless protocol. In practice, this means that TCP is better suited for continuous transmission of data, whereas the more lightweight UDP can be used when reliability isn't important. QAbstractSocket's API unifies most of the differences between the two protocols. For example, although UDP is connectionless, connectToHost() establishes a virtual connection for UDP sockets, enabling you to use QAbstractSocket in more or less the same way regardless of the underlying protocol. Internally, QAbstractSocket remembers the address and port passed to connectToHost(), and functions like read() and write() use these values. At any time, QAbstractSocket has a state (returned by state()). The initial state is UnconnectedState. After calling connectToHost(), the socket first enters HostLookupState. If the host is found, QAbstractSocket enters ConnectingState and emits the hostFound() signal. When the connection has been established, it enters ConnectedState and emits connected(). If an error occurs at any stage, error() is emitted. Whenever the state changes, stateChanged() is emitted. For convenience, isValid() returns true if the socket is ready for reading and writing, but note that the socket's state must be ConnectedState before reading and writing can occur. Read or write data by calling read() or write(), or use the convenience functions readLine() and readAll(). QAbstractSocket also inherits getChar(), putChar(), and ungetChar() from QIODevice, which work on single bytes. The bytesWritten() signal is emitted when data has been written to the socket (i.e., when the client has read the data). Note that Qt does not limit the write buffer size. You can monitor its size by listening to this signal. The readyRead() signal is emitted every time a new chunk of data has arrived. bytesAvailable() then returns the number of bytes that are available for reading. Typically, you would connect the readyRead() signal to a slot and read all available data there. If you don't read all the data at once, the remaining data will still be available later, and any new incoming data will be appended to QAbstractSocket's internal read buffer. To limit the size of the read buffer, call setReadBufferSize(). To close the socket, call disconnectFromHost(). QAbstractSocket enters QAbstractSocket::ClosingState. After all pending data has been written to the socket, QAbstractSocket actually closes the socket, enters QAbstractSocket::ClosedState, and emits disconnected(). If you want to abort a connection immediately, discarding all pending data, call abort() instead. If the remote host closes the connection, QAbstractSocket will emit error(QAbstractSocket::RemoteHostClosedError), during which the socket state will still be ConnectedState, and then the disconnected() signal will be emitted. The port and address of the connected peer is fetched by calling peerPort() and peerAddress(). peerName() returns the host name of the peer, as passed to connectToHost(). localPort() and localAddress() return the port and address of the local socket. QAbstractSocket provides a set of functions that suspend the calling thread until certain signals are emitted. These functions can be used to implement blocking sockets: \list \o waitForConnected() blocks until a connection has been established. \o waitForReadyRead() blocks until new data is available for reading. \o waitForBytesWritten() blocks until one payload of data has been written to the socket. \o waitForDisconnected() blocks until the connection has closed. \endlist We show an example: \snippet doc/src/snippets/network/tcpwait.cpp 0 If \l{QIODevice::}{waitForReadyRead()} returns false, the connection has been closed or an error has occurred. Programming with a blocking socket is radically different from programming with a non-blocking socket. A blocking socket doesn't require an event loop and typically leads to simpler code. However, in a GUI application, blocking sockets should only be used in non-GUI threads, to avoid freezing the user interface. See the \l network/fortuneclient and \l network/blockingfortuneclient examples for an overview of both approaches. QAbstractSocket can be used with QTextStream and QDataStream's stream operators (operator<<() and operator>>()). There is one issue to be aware of, though: You must make sure that enough data is available before attempting to read it using operator>>(). \sa QFtp, QHttp, QTcpServer */ /*! \fn void QAbstractSocket::hostFound() This signal is emitted after connectToHost() has been called and the host lookup has succeeded. \sa connected() */ /*! \fn void QAbstractSocket::connected() This signal is emitted after connectToHost() has been called and a connection has been successfully established. \sa connectToHost(), disconnected() */ /*! \fn void QAbstractSocket::disconnected() This signal is emitted when the socket has been disconnected. \warning If you need to delete the sender() of this signal in a slot connected to it, use the \l{QObject::deleteLater()}{deleteLater()} function. \sa connectToHost(), disconnectFromHost(), abort() */ /*! \fn void QAbstractSocket::error(QAbstractSocket::SocketError socketError) This signal is emitted after an error occurred. The \a socketError parameter describes the type of error that occurred. QAbstractSocket::SocketError is not a registered metatype, so for queued connections, you will have to register it with Q_DECLARE_METATYPE() and qRegisterMetaType(). \sa error(), errorString(), {Creating Custom Qt Types} */ /*! \fn void QAbstractSocket::stateChanged(QAbstractSocket::SocketState socketState) This signal is emitted whenever QAbstractSocket's state changes. The \a socketState parameter is the new state. QAbstractSocket::SocketState is not a registered metatype, so for queued connections, you will have to register it with Q_REGISTER_METATYPE() and qRegisterMetaType(). \sa state(), {Creating Custom Qt Types} */ /*! \fn void QAbstractSocket::proxyAuthenticationRequired(const QNetworkProxy &proxy, QAuthenticator *authenticator) \since 4.3 This signal can be emitted when a \a proxy that requires authentication is used. The \a authenticator object can then be filled in with the required details to allow authentication and continue the connection. \note It is not possible to use a QueuedConnection to connect to this signal, as the connection will fail if the authenticator has not been filled in with new information when the signal returns. \sa QAuthenticator, QNetworkProxy */ /*! \enum QAbstractSocket::NetworkLayerProtocol This enum describes the network layer protocol values used in Qt. \value IPv4Protocol IPv4 \value IPv6Protocol IPv6 \value UnknownNetworkLayerProtocol Other than IPv4 and IPv6 \sa QHostAddress::protocol() */ /*! \enum QAbstractSocket::SocketType This enum describes the transport layer protocol. \value TcpSocket TCP \value UdpSocket UDP \value UnknownSocketType Other than TCP and UDP \sa QAbstractSocket::socketType() */ /*! \enum QAbstractSocket::SocketError This enum describes the socket errors that can occur. \value ConnectionRefusedError The connection was refused by the peer (or timed out). \value RemoteHostClosedError The remote host closed the connection. Note that the client socket (i.e., this socket) will be closed after the remote close notification has been sent. \value HostNotFoundError The host address was not found. \value SocketAccessError The socket operation failed because the application lacked the required privileges. \value SocketResourceError The local system ran out of resources (e.g., too many sockets). \value SocketTimeoutError The socket operation timed out. \value DatagramTooLargeError The datagram was larger than the operating system's limit (which can be as low as 8192 bytes). \value NetworkError An error occurred with the network (e.g., the network cable was accidentally plugged out). \value AddressInUseError The address specified to QUdpSocket::bind() is already in use and was set to be exclusive. \value SocketAddressNotAvailableError The address specified to QUdpSocket::bind() does not belong to the host. \value UnsupportedSocketOperationError The requested socket operation is not supported by the local operating system (e.g., lack of IPv6 support). \value ProxyAuthenticationRequiredError The socket is using a proxy, and the proxy requires authentication. \value SslHandshakeFailedError The SSL/TLS handshake failed, so the connection was closed (only used in QSslSocket) \value UnfinishedSocketOperationError Used by QAbstractSocketEngine only, The last operation attempted has not finished yet (still in progress in the background). \value ProxyConnectionRefusedError Could not contact the proxy server because the connection to that server was denied \value ProxyConnectionClosedError The connection to the proxy server was closed unexpectedly (before the connection to the final peer was established) \value ProxyConnectionTimeoutError The connection to the proxy server timed out or the proxy server stopped responding in the authentication phase. \value ProxyNotFoundError The proxy address set with setProxy() (or the application proxy) was not found. \value ProxyProtocolError The connection negotiation with the proxy server because the response from the proxy server could not be understood. \value UnknownSocketError An unidentified error occurred. \sa QAbstractSocket::error() */ /*! \enum QAbstractSocket::SocketState This enum describes the different states in which a socket can be. \value UnconnectedState The socket is not connected. \value HostLookupState The socket is performing a host name lookup. \value ConnectingState The socket has started establishing a connection. \value ConnectedState A connection is established. \value BoundState The socket is bound to an address and port (for servers). \value ClosingState The socket is about to close (data may still be waiting to be written). \value ListeningState For internal use only. \omitvalue Idle \omitvalue HostLookup \omitvalue Connecting \omitvalue Connected \omitvalue Closing \omitvalue Connection \sa QAbstractSocket::state() */ #include "qabstractsocket.h" #include "qabstractsocket_p.h" #include #include #include #include #include #include #include #ifndef QT_NO_OPENSSL #include #endif #include #ifdef QABSTRACTSOCKET_DEBUG #include #endif #include #define Q_CHECK_SOCKETENGINE(returnValue) do { \ if (!d->socketEngine) { \ return returnValue; \ } } while (0) #ifndef QABSTRACTSOCKET_BUFFERSIZE #define QABSTRACTSOCKET_BUFFERSIZE 32768 #endif #define QT_CONNECT_TIMEOUT 30000 #define QT_TRANSFER_TIMEOUT 120000 QT_BEGIN_NAMESPACE #if defined QABSTRACTSOCKET_DEBUG QT_BEGIN_INCLUDE_NAMESPACE #include #include QT_END_INCLUDE_NAMESPACE /* Returns a human readable representation of the first \a len characters in \a data. */ static QByteArray qt_prettyDebug(const char *data, int len, int maxLength) { if (!data) return "(null)"; QByteArray out; for (int i = 0; i < len; ++i) { char c = data[i]; if (isprint(int(uchar(c)))) { out += c; } else switch (c) { case '\n': out += "\\n"; break; case '\r': out += "\\r"; break; case '\t': out += "\\t"; break; default: QString tmp; tmp.sprintf("\\%o", c); out += tmp.toLatin1(); } } if (len < maxLength) out += "..."; return out; } #endif static bool isProxyError(QAbstractSocket::SocketError error) { switch (error) { case QAbstractSocket::ProxyAuthenticationRequiredError: case QAbstractSocket::ProxyConnectionRefusedError: case QAbstractSocket::ProxyConnectionClosedError: case QAbstractSocket::ProxyConnectionTimeoutError: case QAbstractSocket::ProxyNotFoundError: case QAbstractSocket::ProxyProtocolError: return true; default: return false; } } /*! \internal Constructs a QAbstractSocketPrivate. Initializes all members. */ QAbstractSocketPrivate::QAbstractSocketPrivate() : readSocketNotifierCalled(false), readSocketNotifierState(false), readSocketNotifierStateSet(false), emittedReadyRead(false), emittedBytesWritten(false), abortCalled(false), closeCalled(false), pendingClose(false), port(0), localPort(0), peerPort(0), socketEngine(0), cachedSocketDescriptor(-1), readBufferMaxSize(0), readBuffer(QABSTRACTSOCKET_BUFFERSIZE), writeBuffer(QABSTRACTSOCKET_BUFFERSIZE), isBuffered(false), blockingTimeout(30000), connectTimer(0), connectTimeElapsed(0), hostLookupId(-1), state(QAbstractSocket::UnconnectedState), socketError(QAbstractSocket::UnknownSocketError) { } /*! \internal Destructs the QAbstractSocket. If the socket layer is open, it will be reset. */ QAbstractSocketPrivate::~QAbstractSocketPrivate() { } /*! \internal Resets the socket layer, clears the read and write buffers and deletes any socket notifiers. */ void QAbstractSocketPrivate::resetSocketLayer() { #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::resetSocketLayer()"); #endif if (socketEngine) { socketEngine->close(); socketEngine->disconnect(); delete socketEngine; socketEngine = 0; cachedSocketDescriptor = -1; } if (connectTimer) { connectTimer->stop(); } } /*! \internal Initializes the socket layer to by of type \a type, using the network layer protocol \a protocol. Resets the socket layer first if it's already initialized. Sets up the socket notifiers. */ bool QAbstractSocketPrivate::initSocketLayer(QAbstractSocket::NetworkLayerProtocol protocol) { #ifdef QT_NO_NETWORKPROXY // this is here to avoid a duplication of the call to createSocketEngine below static const QNetworkProxy &proxyInUse = *(QNetworkProxy *)0; #endif Q_Q(QAbstractSocket); #if defined (QABSTRACTSOCKET_DEBUG) QString typeStr; if (q->socketType() == QAbstractSocket::TcpSocket) typeStr = "TcpSocket"; else if (q->socketType() == QAbstractSocket::UdpSocket) typeStr = "UdpSocket"; else typeStr = "UnknownSocketType"; QString protocolStr; if (protocol == QAbstractSocket::IPv4Protocol) protocolStr = "IPv4Protocol"; else if (protocol == QAbstractSocket::IPv6Protocol) protocolStr = "IPv6Protocol"; else protocolStr = "UnknownNetworkLayerProtocol"; #endif resetSocketLayer(); socketEngine = QAbstractSocketEngine::createSocketEngine(q->socketType(), proxyInUse, q); if (!socketEngine) { socketError = QAbstractSocket::UnsupportedSocketOperationError; q->setErrorString(QAbstractSocket::tr("Operation on socket is not supported")); return false; } if (!socketEngine->initialize(q->socketType(), protocol)) { #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::initSocketLayer(%s, %s) failed (%s)", typeStr.toLatin1().constData(), protocolStr.toLatin1().constData(), socketEngine->errorString().toLatin1().constData()); #endif socketError = socketEngine->error(); q->setErrorString(socketEngine->errorString()); return false; } if (threadData->eventDispatcher) socketEngine->setReceiver(this); #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::initSocketLayer(%s, %s) success", typeStr.toLatin1().constData(), protocolStr.toLatin1().constData()); #endif return true; } /*! \internal Slot connected to the read socket notifier. This slot is called when new data is available for reading, or when the socket has been closed. Handles recursive calls. */ bool QAbstractSocketPrivate::canReadNotification() { Q_Q(QAbstractSocket); #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::canReadNotification()"); #endif // Prevent recursive calls if (readSocketNotifierCalled) { if (!readSocketNotifierStateSet) { readSocketNotifierStateSet = true; readSocketNotifierState = socketEngine->isReadNotificationEnabled(); socketEngine->setReadNotificationEnabled(false); } } readSocketNotifierCalled = true; if (!isBuffered) socketEngine->setReadNotificationEnabled(false); // If buffered, read data from the socket into the read buffer qint64 newBytes = 0; if (isBuffered) { // Return if there is no space in the buffer if (readBufferMaxSize && readBuffer.size() >= readBufferMaxSize) { #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::canReadNotification() buffer is full"); #endif readSocketNotifierCalled = false; return false; } // If reading from the socket fails after getting a read // notification, close the socket. newBytes = readBuffer.size(); if (!readFromSocket()) { #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::canReadNotification() disconnecting socket"); #endif q->disconnectFromHost(); readSocketNotifierCalled = false; return false; } newBytes = readBuffer.size() - newBytes; // If read buffer is full, disable the read socket notifier. if (readBufferMaxSize && readBuffer.size() == readBufferMaxSize) { socketEngine->setReadNotificationEnabled(false); } } // only emit readyRead() when not recursing, and only if there is data available bool hasData = newBytes > 0 #ifndef QT_NO_UDPSOCKET || (!isBuffered && socketEngine && socketEngine->hasPendingDatagrams()) #endif ; if (!emittedReadyRead && hasData) { emittedReadyRead = true; emit q->readyRead(); emittedReadyRead = false; } // If we were closed as a result of the readyRead() signal, // return. if (state == QAbstractSocket::UnconnectedState || state == QAbstractSocket::ClosingState) { #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::canReadNotification() socket is closing - returning"); #endif readSocketNotifierCalled = false; return true; } if (!hasData && socketEngine) socketEngine->setReadNotificationEnabled(true); // reset the read socket notifier state if we reentered inside the // readyRead() connected slot. if (readSocketNotifierStateSet && socketEngine && readSocketNotifierState != socketEngine->isReadNotificationEnabled()) { socketEngine->setReadNotificationEnabled(readSocketNotifierState); readSocketNotifierStateSet = false; } readSocketNotifierCalled = false; return true; } /*! \internal Slot connected to the write socket notifier. It's called during a delayed connect or when the socket is ready for writing. */ bool QAbstractSocketPrivate::canWriteNotification() { #if defined (Q_OS_WIN) if (socketEngine && socketEngine->isWriteNotificationEnabled()) socketEngine->setWriteNotificationEnabled(false); #endif #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::canWriteNotification() flushing"); #endif int tmp = writeBuffer.size(); flush(); if (socketEngine) { #if defined (Q_OS_WIN) if (!writeBuffer.isEmpty()) socketEngine->setWriteNotificationEnabled(true); #else if (writeBuffer.isEmpty()) socketEngine->setWriteNotificationEnabled(false); #endif } return (writeBuffer.size() < tmp); } /*! \internal Slot connected to a notification of connection status change. Either we finished connecting or we failed to connect. */ void QAbstractSocketPrivate::connectionNotification() { // If in connecting state, check if the connection has been // established, otherwise flush pending data. if (state == QAbstractSocket::ConnectingState) { #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::connectionNotification() testing connection"); #endif _q_testConnection(); } } /*! \internal Writes pending data in the write buffers to the socket. The function writes as much as it can without blocking. It is usually invoked by canWriteNotification after one or more calls to write(). Emits bytesWritten(). */ bool QAbstractSocketPrivate::flush() { Q_Q(QAbstractSocket); if (!socketEngine || !socketEngine->isValid() || writeBuffer.isEmpty()) { #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::flush() nothing to do: valid ? %s, writeBuffer.isEmpty() ? %s", socketEngine->isValid() ? "yes" : "no", writeBuffer.isEmpty() ? "yes" : "no"); #endif return false; } int nextSize = writeBuffer.nextDataBlockSize(); const char *ptr = writeBuffer.readPointer(); // Attempt to write it all in one chunk. qint64 written = socketEngine->write(ptr, nextSize); if (written < 0) { socketError = socketEngine->error(); q->setErrorString(socketEngine->errorString()); emit q->error(socketError); // an unexpected error so close the socket. #if defined (QABSTRACTSOCKET_DEBUG) qDebug() << "QAbstractSocketPrivate::flush() write error, aborting." << socketEngine->errorString(); #endif q->abort(); return false; } #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::flush() %lld bytes written to the network", written); #endif // Remove what we wrote so far. writeBuffer.free(written); if (written > 0) { // Don't emit bytesWritten() recursively. if (!emittedBytesWritten) { emittedBytesWritten = true; emit q->bytesWritten(written); emittedBytesWritten = false; } } if (writeBuffer.isEmpty() && socketEngine && socketEngine->isWriteNotificationEnabled()) socketEngine->setWriteNotificationEnabled(false); if (state == QAbstractSocket::ClosingState) q->disconnectFromHost(); return true; } #ifndef QT_NO_NETWORKPROXY /*! \internal Resolve the proxy to its final value. */ void QAbstractSocketPrivate::resolveProxy(const QString &hostname, quint16 port) { QHostAddress parsed; if (hostname == QLatin1String("localhost") || hostname.startsWith(QLatin1String("localhost.")) || (parsed.setAddress(hostname) && (parsed == QHostAddress::LocalHost || parsed == QHostAddress::LocalHostIPv6))) { proxyInUse = QNetworkProxy::NoProxy; return; } QList proxies; if (proxy.type() != QNetworkProxy::DefaultProxy) { // a non-default proxy was set with setProxy proxies << proxy; } else { // try the application settings instead QNetworkProxyQuery query(hostname, port, QString(), socketType == QAbstractSocket::TcpSocket ? QNetworkProxyQuery::TcpSocket : QNetworkProxyQuery::UdpSocket); proxies = QNetworkProxyFactory::proxyForQuery(query); } // return the first that we can use foreach (const QNetworkProxy &p, proxies) { if (socketType == QAbstractSocket::UdpSocket && (p.capabilities() & QNetworkProxy::UdpTunnelingCapability) == 0) continue; if (socketType == QAbstractSocket::TcpSocket && (p.capabilities() & QNetworkProxy::TunnelingCapability) == 0) continue; proxyInUse = p; return; } // no proxy found // DefaultProxy here will raise an error proxyInUse = QNetworkProxy(); } /*! \internal Starts the connection to \a host, like _q_startConnecting below, but without hostname resolution. */ void QAbstractSocketPrivate::startConnectingByName(const QString &host) { Q_Q(QAbstractSocket); if (state == QAbstractSocket::ConnectingState || state == QAbstractSocket::ConnectedState) return; #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::startConnectingByName(host == %s)", qPrintable(host)); #endif // ### Let the socket engine drive this? state = QAbstractSocket::ConnectingState; emit q->stateChanged(state); connectTimeElapsed = 0; if (initSocketLayer(QAbstractSocket::UnknownNetworkLayerProtocol)) { if (socketEngine->connectToHostByName(host, port) || socketEngine->state() == QAbstractSocket::ConnectingState) { cachedSocketDescriptor = socketEngine->socketDescriptor(); return; } // failed to connect socketError = socketEngine->error(); q->setErrorString(socketEngine->errorString()); } state = QAbstractSocket::UnconnectedState; emit q->error(socketError); emit q->stateChanged(state); } #endif /*! \internal Slot connected to QHostInfo::lookupHost() in connectToHost(). This function starts the process of connecting to any number of candidate IP addresses for the host, if it was found. Calls _q_connectToNextAddress(). */ void QAbstractSocketPrivate::_q_startConnecting(const QHostInfo &hostInfo) { Q_Q(QAbstractSocket); if (state != QAbstractSocket::HostLookupState) return; addresses = hostInfo.addresses(); #if defined(QABSTRACTSOCKET_DEBUG) QString s = "{"; for (int i = 0; i < addresses.count(); ++i) { if (i != 0) s += ", "; s += addresses.at(i).toString(); } s += "}"; qDebug("QAbstractSocketPrivate::_q_startConnecting(hostInfo == %s)", s.toLatin1().constData()); #endif // Try all addresses twice. addresses += addresses; // If there are no addresses in the host list, report this to the // user. if (addresses.isEmpty()) { #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::_q_startConnecting(), host not found"); #endif state = QAbstractSocket::UnconnectedState; socketError = QAbstractSocket::HostNotFoundError; q->setErrorString(QAbstractSocket::tr("Host not found")); emit q->stateChanged(state); emit q->error(QAbstractSocket::HostNotFoundError); return; } // Enter Connecting state (see also sn_write, which is called by // the write socket notifier after connect()) state = QAbstractSocket::ConnectingState; emit q->stateChanged(state); // Report the successful host lookup emit q->hostFound(); // Reset the total time spent connecting. connectTimeElapsed = 0; // The addresses returned by the lookup will be tested one after // another by _q_connectToNextAddress(). _q_connectToNextAddress(); } /*! \internal Called by a queued or direct connection from _q_startConnecting() or _q_testConnection(), this function takes the first address of the pending addresses list and tries to connect to it. If the connection succeeds, QAbstractSocket will emit connected(). Otherwise, error(ConnectionRefusedError) or error(SocketTimeoutError) is emitted. */ void QAbstractSocketPrivate::_q_connectToNextAddress() { Q_Q(QAbstractSocket); do { // Check for more pending addresses if (addresses.isEmpty()) { #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::_q_connectToNextAddress(), all addresses failed."); #endif state = QAbstractSocket::UnconnectedState; if (socketEngine) { if ((socketEngine->error() == QAbstractSocket::UnknownSocketError #ifdef Q_OS_AIX // On AIX, the second connect call will result in EINVAL and not // ECONNECTIONREFUSED; although the meaning is the same. || socketEngine->error() == QAbstractSocket::UnsupportedSocketOperationError #endif ) && socketEngine->state() == QAbstractSocket::ConnectingState) { socketError = QAbstractSocket::ConnectionRefusedError; q->setErrorString(QAbstractSocket::tr("Connection refused")); } else { socketError = socketEngine->error(); q->setErrorString(socketEngine->errorString()); } } else { // socketError = QAbstractSocket::ConnectionRefusedError; // q->setErrorString(QAbstractSocket::tr("Connection refused")); } emit q->stateChanged(state); emit q->error(socketError); return; } // Pick the first host address candidate host = addresses.takeFirst(); #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::_q_connectToNextAddress(), connecting to %s:%i, %d left to try", host.toString().toLatin1().constData(), port, addresses.count()); #endif #if defined(QT_NO_IPV6) if (host.protocol() == QAbstractSocket::IPv6Protocol) { // If we have no IPv6 support, then we will not be able to // connect. So we just pretend we didn't see this address. #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::_q_connectToNextAddress(), skipping IPv6 entry"); #endif continue; } #endif if (!initSocketLayer(host.protocol())) { // hope that the next address is better #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::_q_connectToNextAddress(), failed to initialize sock layer"); #endif continue; } // Tries to connect to the address. If it succeeds immediately // (localhost address on BSD or any UDP connect), emit // connected() and return. if (socketEngine->connectToHost(host, port)) { //_q_testConnection(); fetchConnectionParameters(); return; } // cache the socket descriptor even if we're not fully connected yet cachedSocketDescriptor = socketEngine->socketDescriptor(); // Check that we're in delayed connection state. If not, try // the next address if (socketEngine->state() != QAbstractSocket::ConnectingState) { #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::_q_connectToNextAddress(), connection failed (%s)", socketEngine->errorString().toLatin1().constData()); #endif continue; } // Start the connect timer. if (threadData->eventDispatcher) { if (!connectTimer) { connectTimer = new QTimer(q); QObject::connect(connectTimer, SIGNAL(timeout()), q, SLOT(_q_abortConnectionAttempt()), Qt::DirectConnection); } connectTimer->start(QT_CONNECT_TIMEOUT); } // Wait for a write notification that will eventually call // _q_testConnection(). socketEngine->setWriteNotificationEnabled(true); break; } while (state != QAbstractSocket::ConnectedState); } /*! \internal Tests if a connection has been established. If it has, connected() is emitted. Otherwise, _q_connectToNextAddress() is invoked. */ void QAbstractSocketPrivate::_q_testConnection() { if (socketEngine) { if (threadData->eventDispatcher) { if (connectTimer) connectTimer->stop(); } if (socketEngine->state() == QAbstractSocket::ConnectedState) { // Fetch the parameters if our connection is completed; // otherwise, fall out and try the next address. fetchConnectionParameters(); if (pendingClose) { q_func()->disconnectFromHost(); pendingClose = false; } return; } // don't retry the other addresses if we had a proxy error if (isProxyError(socketEngine->error())) addresses.clear(); } if (threadData->eventDispatcher) { if (connectTimer) connectTimer->stop(); } #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::_q_testConnection() connection failed," " checking for alternative addresses"); #endif _q_connectToNextAddress(); } /*! \internal This function is called after a certain number of seconds has passed while waiting for a connection. It simply tests the connection, and continues to the next address if the connection failed. */ void QAbstractSocketPrivate::_q_abortConnectionAttempt() { Q_Q(QAbstractSocket); #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::_q_abortConnectionAttempt() (timed out)"); #endif if (socketEngine) socketEngine->setWriteNotificationEnabled(false); connectTimer->stop(); if (addresses.isEmpty()) { state = QAbstractSocket::UnconnectedState; socketError = QAbstractSocket::SocketTimeoutError; q->setErrorString(QAbstractSocket::tr("Connection timed out")); emit q->stateChanged(state); emit q->error(socketError); } else { _q_connectToNextAddress(); } } /*! \internal Reads data from the socket layer into the read buffer. Returns true on success; otherwise false. */ bool QAbstractSocketPrivate::readFromSocket() { Q_Q(QAbstractSocket); // Find how many bytes we can read from the socket layer. qint64 bytesToRead = socketEngine->bytesAvailable(); #ifdef Q_OS_LINUX if (bytesToRead > 0) // ### See setSocketDescriptor() bytesToRead += addToBytesAvailable; #endif if (bytesToRead == 0) { // Under heavy load, certain conditions can trigger read notifications // for socket notifiers on which there is no activity. If we continue // to read 0 bytes from the socket, we will trigger behavior similar // to that which signals a remote close. When we hit this condition, // we try to read 4k of data from the socket, which will give us either // an EAGAIN/EWOULDBLOCK if the connection is alive (i.e., the remote // host has _not_ disappeared). bytesToRead = 4096; } if (readBufferMaxSize && bytesToRead > (readBufferMaxSize - readBuffer.size())) bytesToRead = readBufferMaxSize - readBuffer.size(); #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::readFromSocket() about to read %d bytes", int(bytesToRead)); #endif // Read from the socket, store data in the read buffer. char *ptr = readBuffer.reserve(bytesToRead); qint64 readBytes = socketEngine->read(ptr, bytesToRead); if (readBytes == -2) { // No bytes currently available for reading. readBuffer.chop(bytesToRead); return true; } readBuffer.chop(int(bytesToRead - (readBytes < 0 ? qint64(0) : readBytes))); #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::readFromSocket() got %d bytes, buffer size = %d", int(readBytes), readBuffer.size()); #endif if (!socketEngine->isValid()) { socketError = socketEngine->error(); q->setErrorString(socketEngine->errorString()); emit q->error(socketError); #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::readFromSocket() read failed: %s", q->errorString().toLatin1().constData()); #endif resetSocketLayer(); return false; } return true; } /*! \internal Sets up the internal state after the connection has succeeded. */ void QAbstractSocketPrivate::fetchConnectionParameters() { Q_Q(QAbstractSocket); peerName = hostName; if (socketEngine) { socketEngine->setReadNotificationEnabled(true); socketEngine->setWriteNotificationEnabled(true); localPort = socketEngine->localPort(); peerPort = socketEngine->peerPort(); localAddress = socketEngine->localAddress(); peerAddress = socketEngine->peerAddress(); cachedSocketDescriptor = socketEngine->socketDescriptor(); } state = QAbstractSocket::ConnectedState; emit q->stateChanged(state); emit q->connected(); #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocketPrivate::fetchConnectionParameters() connection to %s:%i established", host.toString().toLatin1().constData(), port); #endif } /*! \internal Constructs a new abstract socket of type \a socketType. The \a parent argument is passed to QObject's constructor. */ QAbstractSocket::QAbstractSocket(SocketType socketType, QAbstractSocketPrivate &dd, QObject *parent) : QIODevice(dd, parent) { Q_D(QAbstractSocket); #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::QAbstractSocket(%sSocket, QAbstractSocketPrivate == %p, parent == %p)", socketType == TcpSocket ? "Tcp" : socketType == UdpSocket ? "Udp" : "Unknown", &dd, parent); #endif d->socketType = socketType; } /*! Creates a new abstract socket of type \a socketType. The \a parent argument is passed to QObject's constructor. \sa socketType(), QTcpSocket, QUdpSocket */ QAbstractSocket::QAbstractSocket(SocketType socketType, QObject *parent) : QIODevice(*new QAbstractSocketPrivate, parent) { Q_D(QAbstractSocket); #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::QAbstractSocket(%p)", parent); #endif d->socketType = socketType; } /*! Destroys the socket. */ QAbstractSocket::~QAbstractSocket() { Q_D(QAbstractSocket); #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::~QAbstractSocket()"); #endif if (d->state != UnconnectedState) abort(); } /*! Returns true if the socket is valid and ready for use; otherwise returns false. \bold{Note:} The socket's state must be ConnectedState before reading and writing can occur. \sa state() */ bool QAbstractSocket::isValid() const { return d_func()->socketEngine ? d_func()->socketEngine->isValid() : isOpen(); } /*! Attempts to make a connection to \a hostName on the given \a port. The socket is opened in the given \a openMode and first enters HostLookupState, then performs a host name lookup of \a hostName. If the lookup succeeds, hostFound() is emitted and QAbstractSocket enters ConnectingState. It then attempts to connect to the address or addresses returned by the lookup. Finally, if a connection is established, QAbstractSocket enters ConnectedState and emits connected(). At any point, the socket can emit error() to signal that an error occurred. \a hostName may be an IP address in string form (e.g., "43.195.83.32"), or it may be a host name (e.g., "example.com"). QAbstractSocket will do a lookup only if required. \a port is in native byte order. \sa state(), peerName(), peerAddress(), peerPort(), waitForConnected() */ void QAbstractSocket::connectToHost(const QString &hostName, quint16 port, OpenMode openMode) { QMetaObject::invokeMethod(this, "connectToHostImplementation", Qt::DirectConnection, Q_ARG(QString, hostName), Q_ARG(quint16, port), Q_ARG(OpenMode, openMode)); } /*! \since 4.1 Contains the implementation of connectToHost(). Attempts to make a connection to \a hostName on the given \a port. The socket is opened in the given \a openMode. */ void QAbstractSocket::connectToHostImplementation(const QString &hostName, quint16 port, OpenMode openMode) { Q_D(QAbstractSocket); #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::connectToHost(\"%s\", %i, %i)...", qPrintable(hostName), port, (int) openMode); #endif if (d->state == ConnectedState || d->state == ConnectingState || d->state == ClosingState) { qWarning("QAbstractSocket::connectToHost() called when already connecting/connected to \"%s\"", qPrintable(hostName)); return; } d->hostName = hostName; d->port = port; d->state = UnconnectedState; d->readBuffer.clear(); d->writeBuffer.clear(); d->abortCalled = false; d->closeCalled = false; d->pendingClose = false; d->localPort = 0; d->peerPort = 0; d->localAddress.clear(); d->peerAddress.clear(); d->peerName = hostName; #ifdef Q_OS_LINUX // ### See setSocketDescriptor(). d->addToBytesAvailable = 0; #endif if (d->hostLookupId != -1) { QHostInfo::abortHostLookup(d->hostLookupId); d->hostLookupId = -1; } #ifndef QT_NO_NETWORKPROXY // Get the proxy information d->resolveProxy(hostName, port); if (d->proxyInUse.type() == QNetworkProxy::DefaultProxy) { // failed to setup the proxy d->socketError = QAbstractSocket::UnsupportedSocketOperationError; setErrorString(QAbstractSocket::tr("Operation on socket is not supported")); emit error(d->socketError); return; } #endif if (!d_func()->isBuffered) openMode |= QAbstractSocket::Unbuffered; QIODevice::open(openMode); d->state = HostLookupState; emit stateChanged(d->state); QHostAddress temp; if (temp.setAddress(hostName)) { QHostInfo info; info.setAddresses(QList() << temp); d->_q_startConnecting(info); #ifndef QT_NO_NETWORKPROXY } else if (d->proxyInUse.capabilities() & QNetworkProxy::HostNameLookupCapability) { // the proxy supports connection by name, so use it d->startConnectingByName(hostName); return; #endif } else { if (d->threadData->eventDispatcher) d->hostLookupId = QHostInfo::lookupHost(hostName, this, SLOT(_q_startConnecting(QHostInfo))); } #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::connectToHost(\"%s\", %i) == %s%s", hostName.toLatin1().constData(), port, (d->state == ConnectedState) ? "true" : "false", (d->state == ConnectingState || d->state == HostLookupState) ? " (connection in progress)" : ""); #endif } /*! \overload Attempts to make a connection to \a address on port \a port. */ void QAbstractSocket::connectToHost(const QHostAddress &address, quint16 port, OpenMode openMode) { #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::connectToHost([%s], %i, %i)...", address.toString().toLatin1().constData(), port, (int) openMode); #endif connectToHost(address.toString(), port, openMode); } /*! Returns the number of bytes that are waiting to be written. The bytes are written when control goes back to the event loop or when flush() is called. \sa bytesAvailable(), flush() */ qint64 QAbstractSocket::bytesToWrite() const { Q_D(const QAbstractSocket); #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::bytesToWrite() == %i", d->writeBuffer.size()); #endif return (qint64)d->writeBuffer.size(); } /*! Returns the number of incoming bytes that are waiting to be read. \sa bytesToWrite(), read() */ qint64 QAbstractSocket::bytesAvailable() const { Q_D(const QAbstractSocket); qint64 available = QIODevice::bytesAvailable(); if (d->isBuffered) available += (qint64) d->readBuffer.size(); else if (d->socketEngine && d->socketEngine->isValid()) available += d->socketEngine->bytesAvailable(); #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::bytesAvailable() == %llu", available); #endif return available; } /*! Returns the host port number (in native byte order) of the local socket if available; otherwise returns 0. \sa localAddress(), peerPort(), setLocalPort() */ quint16 QAbstractSocket::localPort() const { Q_D(const QAbstractSocket); return d->localPort; } /*! Returns the host address of the local socket if available; otherwise returns QHostAddress::Null. This is normally the main IP address of the host, but can be QHostAddress::LocalHost (127.0.0.1) for connections to the local host. \sa localPort(), peerAddress(), setLocalAddress() */ QHostAddress QAbstractSocket::localAddress() const { Q_D(const QAbstractSocket); return d->localAddress; } /*! Returns the port of the connected peer if the socket is in ConnectedState; otherwise returns 0. \sa peerAddress(), localPort(), setPeerPort() */ quint16 QAbstractSocket::peerPort() const { Q_D(const QAbstractSocket); return d->peerPort; } /*! Returns the address of the connected peer if the socket is in ConnectedState; otherwise returns QHostAddress::Null. \sa peerName(), peerPort(), localAddress(), setPeerAddress() */ QHostAddress QAbstractSocket::peerAddress() const { Q_D(const QAbstractSocket); return d->peerAddress; } /*! Returns the name of the peer as specified by connectToHost(), or an empty QString if connectToHost() has not been called. \sa peerAddress(), peerPort(), setPeerName() */ QString QAbstractSocket::peerName() const { Q_D(const QAbstractSocket); return d->peerName.isEmpty() ? d->hostName : d->peerName; } /*! Returns true if a line of data can be read from the socket; otherwise returns false. \sa readLine() */ bool QAbstractSocket::canReadLine() const { bool hasLine = d_func()->readBuffer.canReadLine(); #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::canReadLine() == %s, buffer size = %d, size = %d", hasLine ? "true" : "false", d_func()->readBuffer.size(), d_func()->buffer.size()); #endif return hasLine || QIODevice::canReadLine(); } /*! Returns the native socket descriptor of the QAbstractSocket object if this is available; otherwise returns -1. If the socket is using QNetworkProxy, the returned descriptor may not be usable with native socket functions. The socket descriptor is not available when QAbstractSocket is in UnconnectedState. \sa setSocketDescriptor() */ int QAbstractSocket::socketDescriptor() const { Q_D(const QAbstractSocket); return d->cachedSocketDescriptor; } /*! Initializes QAbstractSocket with the native socket descriptor \a socketDescriptor. Returns true if \a socketDescriptor is accepted as a valid socket descriptor; otherwise returns false. The socket is opened in the mode specified by \a openMode, and enters the socket state specified by \a socketState. \bold{Note:} It is not possible to initialize two abstract sockets with the same native socket descriptor. \sa socketDescriptor() */ bool QAbstractSocket::setSocketDescriptor(int socketDescriptor, SocketState socketState, OpenMode openMode) { Q_D(QAbstractSocket); #ifndef QT_NO_OPENSSL if (QSslSocket *socket = qobject_cast(this)) return socket->setSocketDescriptor(socketDescriptor, socketState, openMode); #endif d->resetSocketLayer(); d->socketEngine = QAbstractSocketEngine::createSocketEngine(socketDescriptor, this); if (!d->socketEngine) { d->socketError = UnsupportedSocketOperationError; setErrorString(tr("Operation on socket is not supported")); return false; } bool result = d->socketEngine->initialize(socketDescriptor, socketState); if (!result) { d->socketError = d->socketEngine->error(); setErrorString(d->socketEngine->errorString()); return false; } if (d->threadData->eventDispatcher) d->socketEngine->setReceiver(d); QIODevice::open(openMode); if (d->state != socketState) { d->state = socketState; emit stateChanged(d->state); } d->pendingClose = false; d->socketEngine->setReadNotificationEnabled(true); d->localPort = d->socketEngine->localPort(); d->peerPort = d->socketEngine->peerPort(); d->localAddress = d->socketEngine->localAddress(); d->peerAddress = d->socketEngine->peerAddress(); d->cachedSocketDescriptor = socketDescriptor; #ifdef Q_OS_LINUX // ### This is a workaround for certain broken Linux kernels, when using // QTcpSocket with a Unix domain socket. It was introduced around 2.6.9, // and fixed at some point after that. // http://archive.linux-usenet.com/index-t-73300.html // We can provide a better workaround for this: readFromSocket() can loop // while reading, but this must happen without triggering an implicit // close because of reading after the socket has closed. d->addToBytesAvailable = 4096; #endif return true; } /* Returns the difference between msecs and elapsed. If msecs is -1, however, -1 is returned. */ static int qt_timeout_value(int msecs, int elapsed) { if (msecs == -1) return -1; int timeout = msecs - elapsed; return timeout < 0 ? 0 : timeout; } /*! Waits until the socket is connected, up to \a msecs milliseconds. If the connection has been established, this function returns true; otherwise it returns false. In the case where it returns false, you can call error() to determine the cause of the error. The following example waits up to one second for a connection to be established: \snippet doc/src/snippets/code/src_network_socket_qabstractsocket.cpp 0 If msecs is -1, this function will not time out. Note: This function may wait slightly longer than \a msecs, depending on the time it takes to complete the host lookup. \sa connectToHost(), connected() */ bool QAbstractSocket::waitForConnected(int msecs) { Q_D(QAbstractSocket); #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::waitForConnected(%i)", msecs); #endif if (state() == ConnectedState) { #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::waitForConnected(%i) already connected", msecs); #endif return true; } #ifndef QT_NO_OPENSSL // Manual polymorphism; this function is not virtual, but has an overload // in QSslSocket. if (QSslSocket *socket = qobject_cast(this)) return socket->waitForConnected(msecs); #endif bool wasPendingClose = d->pendingClose; d->pendingClose = false; QTime stopWatch; stopWatch.start(); if (d->state == HostLookupState) { #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::waitForConnected(%i) doing host name lookup", msecs); #endif QHostInfo::abortHostLookup(d->hostLookupId); d->hostLookupId = -1; d->_q_startConnecting(QHostInfo::fromName(d->hostName)); } if (state() == UnconnectedState) return false; bool timedOut = true; #if defined (QABSTRACTSOCKET_DEBUG) int attempt = 1; #endif while (state() == ConnectingState && (msecs == -1 || stopWatch.elapsed() < msecs)) { int timeout = qt_timeout_value(msecs, stopWatch.elapsed()); if (msecs != -1 && timeout > QT_CONNECT_TIMEOUT) timeout = QT_CONNECT_TIMEOUT; #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::waitForConnected(%i) waiting %.2f secs for connection attempt #%i", msecs, timeout / 1000.0, attempt++); #endif timedOut = false; if (d->socketEngine && d->socketEngine->waitForWrite(timeout, &timedOut) && !timedOut) { d->_q_testConnection(); } else { d->_q_connectToNextAddress(); } } if ((timedOut && state() != ConnectedState) || state() == ConnectingState) { d->socketError = SocketTimeoutError; d->state = UnconnectedState; emit stateChanged(d->state); d->resetSocketLayer(); setErrorString(tr("Socket operation timed out")); } #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::waitForConnected(%i) == %s", msecs, state() == ConnectedState ? "true" : "false"); #endif if (state() != ConnectedState) return false; if (wasPendingClose) disconnectFromHost(); return true; } /*! This function blocks until data is available for reading and the \l{QIODevice::}{readyRead()} signal has been emitted. The function will timeout after \a msecs milliseconds; the default timeout is 30000 milliseconds. The function returns true if the readyRead() signal is emitted and there is data available for reading; otherwise it returns false (if an error occurred or the operation timed out). \sa waitForBytesWritten() */ bool QAbstractSocket::waitForReadyRead(int msecs) { Q_D(QAbstractSocket); #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::waitForReadyRead(%i)", msecs); #endif // require calling connectToHost() before waitForReadyRead() if (state() == UnconnectedState) { /* If all you have is a QIODevice pointer to an abstractsocket, you cannot check this, so you cannot avoid this warning. */ // qWarning("QAbstractSocket::waitForReadyRead() is not allowed in UnconnectedState"); return false; } QTime stopWatch; stopWatch.start(); // handle a socket in connecting state if (state() == HostLookupState || state() == ConnectingState) { if (!waitForConnected(msecs)) return false; } Q_ASSERT(d->socketEngine); forever { bool readyToRead = false; bool readyToWrite = false; if (!d->socketEngine->waitForReadOrWrite(&readyToRead, &readyToWrite, true, !d->writeBuffer.isEmpty(), qt_timeout_value(msecs, stopWatch.elapsed()))) { d->socketError = d->socketEngine->error(); setErrorString(d->socketEngine->errorString()); #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::waitForReadyRead(%i) failed (%i, %s)", msecs, d->socketError, errorString().toLatin1().constData()); #endif emit error(d->socketError); if (d->socketError != SocketTimeoutError) close(); return false; } if (readyToRead) { if (d->canReadNotification()) return true; } if (readyToWrite) d->canWriteNotification(); if (state() != ConnectedState) return false; } return false; } /*! \reimp */ bool QAbstractSocket::waitForBytesWritten(int msecs) { Q_D(QAbstractSocket); #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::waitForBytesWritten(%i)", msecs); #endif // require calling connectToHost() before waitForBytesWritten() if (state() == UnconnectedState) { qWarning("QAbstractSocket::waitForBytesWritten() is not allowed in UnconnectedState"); return false; } if (d->writeBuffer.isEmpty()) return false; QTime stopWatch; stopWatch.start(); // handle a socket in connecting state if (state() == HostLookupState || state() == ConnectingState) { if (!waitForConnected(msecs)) return false; } forever { bool readyToRead = false; bool readyToWrite = false; if (!d->socketEngine->waitForReadOrWrite(&readyToRead, &readyToWrite, true, !d->writeBuffer.isEmpty(), qt_timeout_value(msecs, stopWatch.elapsed()))) { d->socketError = d->socketEngine->error(); setErrorString(d->socketEngine->errorString()); #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::waitForBytesWritten(%i) failed (%i, %s)", msecs, d->socketError, errorString().toLatin1().constData()); #endif emit error(d->socketError); if (d->socketError != SocketTimeoutError) close(); return false; } if (readyToRead) { #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::waitForBytesWritten calls canReadNotification"); #endif if(!d->canReadNotification()) return false; } if (readyToWrite) { if (d->canWriteNotification()) { #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::waitForBytesWritten returns true"); #endif return true; } } if (state() != ConnectedState) return false; } return false; } /*! Waits until the socket has disconnected, up to \a msecs milliseconds. If the connection has been disconnected, this function returns true; otherwise it returns false. In the case where it returns false, you can call error() to determine the cause of the error. The following example waits up to one second for a connection to be closed: \snippet doc/src/snippets/code/src_network_socket_qabstractsocket.cpp 1 If msecs is -1, this function will not time out. \sa disconnectFromHost(), close() */ bool QAbstractSocket::waitForDisconnected(int msecs) { Q_D(QAbstractSocket); #ifndef QT_NO_OPENSSL // Manual polymorphism; this function is not virtual, but has an overload // in QSslSocket. if (QSslSocket *socket = qobject_cast(this)) return socket->waitForDisconnected(msecs); #endif // require calling connectToHost() before waitForDisconnected() if (state() == UnconnectedState) { qWarning("QAbstractSocket::waitForDisconnected() is not allowed in UnconnectedState"); return false; } QTime stopWatch; stopWatch.start(); // handle a socket in connecting state if (state() == HostLookupState || state() == ConnectingState) { if (!waitForConnected(msecs)) return false; if (state() == UnconnectedState) return true; } forever { bool readyToRead = false; bool readyToWrite = false; if (!d->socketEngine->waitForReadOrWrite(&readyToRead, &readyToWrite, state() == ConnectedState, !d->writeBuffer.isEmpty(), qt_timeout_value(msecs, stopWatch.elapsed()))) { d->socketError = d->socketEngine->error(); setErrorString(d->socketEngine->errorString()); #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::waitForReadyRead(%i) failed (%i, %s)", msecs, d->socketError, errorString().toLatin1().constData()); #endif emit error(d->socketError); if (d->socketError != SocketTimeoutError) close(); return false; } if (readyToRead) d->canReadNotification(); if (readyToWrite) d->canWriteNotification(); if (state() == UnconnectedState) return true; } return false; } /*! Aborts the current connection and resets the socket. Unlike disconnectFromHost(), this function immediately closes the socket, discarding any pending data in the write buffer. \sa disconnectFromHost(), close() */ void QAbstractSocket::abort() { Q_D(QAbstractSocket); #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::abort()"); #endif if (d->state == UnconnectedState) return; #ifndef QT_NO_OPENSSL if (QSslSocket *socket = qobject_cast(this)) { socket->abort(); return; } #endif if (d->connectTimer) { d->connectTimer->stop(); delete d->connectTimer; d->connectTimer = 0; } d->writeBuffer.clear(); d->abortCalled = true; close(); } /*! \reimp */ bool QAbstractSocket::isSequential() const { return true; } /*! \reimp Returns true if no more data is currently available for reading; otherwise returns false. This function is most commonly used when reading data from the socket in a loop. For example: \snippet doc/src/snippets/code/src_network_socket_qabstractsocket.cpp 2 \sa bytesAvailable(), readyRead() */ bool QAbstractSocket::atEnd() const { return QIODevice::atEnd() && (!isOpen() || d_func()->readBuffer.isEmpty()); } /*! This function writes as much as possible from the internal write buffer to the underlying network socket, without blocking. If any data was written, this function returns true; otherwise false is returned. Call this function if you need QAbstractSocket to start sending buffered data immediately. The number of bytes successfully written depends on the operating system. In most cases, you do not need to call this function, because QAbstractSocket will start sending data automatically once control goes back to the event loop. In the absence of an event loop, call waitForBytesWritten() instead. \sa write(), waitForBytesWritten() */ // Note! docs copied to QSslSocket::flush() bool QAbstractSocket::flush() { Q_D(QAbstractSocket); #ifndef QT_NO_OPENSSL // Manual polymorphism; flush() isn't virtual, but QSslSocket overloads // it. if (QSslSocket *socket = qobject_cast(this)) return socket->flush(); #endif Q_CHECK_SOCKETENGINE(false); return d->flush(); } /*! \reimp */ qint64 QAbstractSocket::readData(char *data, qint64 maxSize) { Q_D(QAbstractSocket); if (d->socketEngine && !d->socketEngine->isReadNotificationEnabled() && d->socketEngine->isValid()) d->socketEngine->setReadNotificationEnabled(true); if (!d->isBuffered) { if (!d->socketEngine) return -1; // no socket engine is probably EOF qint64 readBytes = d->socketEngine->read(data, maxSize); if (readBytes < 0) { d->socketError = d->socketEngine->error(); setErrorString(d->socketEngine->errorString()); } if (!d->socketEngine->isReadNotificationEnabled()) d->socketEngine->setReadNotificationEnabled(true); #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::readData(%p \"%s\", %lli) == %lld", data, qt_prettyDebug(data, 32, readBytes).data(), maxSize, readBytes); #endif return readBytes; } if (d->readBuffer.isEmpty()) // if we're still connected, return 0 indicating there may be more data in the future // if we're not connected, return -1 indicating EOF return d->state == QAbstractSocket::ConnectedState ? qint64(0) : qint64(-1); // If readFromSocket() read data, copy it to its destination. if (maxSize == 1) { *data = d->readBuffer.getChar(); #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::readData(%p '%c (0x%.2x)', 1) == 1", data, isprint(int(uchar(*data))) ? *data : '?', *data); #endif return 1; } qint64 bytesToRead = qMin(qint64(d->readBuffer.size()), maxSize); qint64 readSoFar = 0; while (readSoFar < bytesToRead) { const char *ptr = d->readBuffer.readPointer(); int bytesToReadFromThisBlock = qMin(int(bytesToRead - readSoFar), d->readBuffer.nextDataBlockSize()); memcpy(data + readSoFar, ptr, bytesToReadFromThisBlock); readSoFar += bytesToReadFromThisBlock; d->readBuffer.free(bytesToReadFromThisBlock); } #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::readData(%p \"%s\", %lli) == %lld", data, qt_prettyDebug(data, qMin(32, readSoFar), readSoFar).data(), maxSize, readSoFar); #endif return readSoFar; } /*! \reimp */ qint64 QAbstractSocket::readLineData(char *data, qint64 maxlen) { return QIODevice::readLineData(data, maxlen); } /*! \reimp */ qint64 QAbstractSocket::writeData(const char *data, qint64 size) { Q_D(QAbstractSocket); if (d->state == QAbstractSocket::UnconnectedState) { d->socketError = QAbstractSocket::UnknownSocketError; setErrorString(tr("Socket is not connected")); return -1; } if (!d->isBuffered) { qint64 written = d->socketEngine->write(data, size); if (written < 0) { d->socketError = d->socketEngine->error(); setErrorString(d->socketEngine->errorString()); } else if (!d->writeBuffer.isEmpty()) { d->socketEngine->setWriteNotificationEnabled(true); } #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::writeData(%p \"%s\", %lli) == %lli", data, qt_prettyDebug(data, qMin((int)size, 32), size).data(), size, written); #endif if (written >= 0) emit bytesWritten(written); return written; } char *ptr = d->writeBuffer.reserve(size); if (size == 1) *ptr = *data; else memcpy(ptr, data, size); qint64 written = size; if (d->socketEngine && !d->writeBuffer.isEmpty()) d->socketEngine->setWriteNotificationEnabled(true); #if defined (QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::writeData(%p \"%s\", %lli) == %lli", data, qt_prettyDebug(data, qMin((int)size, 32), size).data(), size, written); #endif return written; } /*! \since 4.1 Sets the port on the local side of a connection to \a port. You can call this function in a subclass of QAbstractSocket to change the return value of the localPort() function after a connection has been established. This feature is commonly used by proxy connections for virtual connection settings. Note that this function does not bind the local port of the socket prior to a connection (e.g., QUdpSocket::bind()). \sa localAddress(), setLocalAddress(), setPeerPort() */ void QAbstractSocket::setLocalPort(quint16 port) { Q_D(QAbstractSocket); d->localPort = port; } /*! \since 4.1 Sets the address on the local side of a connection to \a address. You can call this function in a subclass of QAbstractSocket to change the return value of the localAddress() function after a connection has been established. This feature is commonly used by proxy connections for virtual connection settings. Note that this function does not bind the local address of the socket prior to a connection (e.g., QUdpSocket::bind()). \sa localAddress(), setLocalPort(), setPeerAddress() */ void QAbstractSocket::setLocalAddress(const QHostAddress &address) { Q_D(QAbstractSocket); d->localAddress = address; } /*! \since 4.1 Sets the port of the remote side of the connection to \a port. You can call this function in a subclass of QAbstractSocket to change the return value of the peerPort() function after a connection has been established. This feature is commonly used by proxy connections for virtual connection settings. \sa peerPort(), setPeerAddress(), setLocalPort() */ void QAbstractSocket::setPeerPort(quint16 port) { Q_D(QAbstractSocket); d->peerPort = port; } /*! \since 4.1 Sets the address of the remote side of the connection to \a address. You can call this function in a subclass of QAbstractSocket to change the return value of the peerAddress() function after a connection has been established. This feature is commonly used by proxy connections for virtual connection settings. \sa peerAddress(), setPeerPort(), setLocalAddress() */ void QAbstractSocket::setPeerAddress(const QHostAddress &address) { Q_D(QAbstractSocket); d->peerAddress = address; } /*! \since 4.1 Sets the host name of the remote peer to \a name. You can call this function in a subclass of QAbstractSocket to change the return value of the peerName() function after a connection has been established. This feature is commonly used by proxy connections for virtual connection settings. \sa peerName() */ void QAbstractSocket::setPeerName(const QString &name) { Q_D(QAbstractSocket); d->peerName = name; } /*! Closes the I/O device for the socket, disconnects the socket's connection with the host, closes the socket, and resets the name, address, port number and underlying socket descriptor. See QIODevice::close() for a description of the actions that occur when an I/O device is closed. \sa abort() */ void QAbstractSocket::close() { Q_D(QAbstractSocket); #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::close()"); #endif QIODevice::close(); if (d->state != UnconnectedState) { d->closeCalled = true; disconnectFromHost(); } d->localPort = 0; d->peerPort = 0; d->localAddress.clear(); d->peerAddress.clear(); d->peerName.clear(); d->cachedSocketDescriptor = -1; } /*! Attempts to close the socket. If there is pending data waiting to be written, QAbstractSocket will enter ClosingState and wait until all data has been written. Eventually, it will enter UnconnectedState and emit the disconnected() signal. \sa connectToHost() */ void QAbstractSocket::disconnectFromHost() { QMetaObject::invokeMethod(this, "disconnectFromHostImplementation", Qt::DirectConnection); } /*! \since 4.1 Contains the implementation of disconnectFromHost(). */ void QAbstractSocket::disconnectFromHostImplementation() { Q_D(QAbstractSocket); #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::disconnectFromHost()"); #endif if (d->state == UnconnectedState) { #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::disconnectFromHost() was called on an unconnected socket"); #endif return; } if (!d->abortCalled && (d->state == ConnectingState || d->state == HostLookupState)) { #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::disconnectFromHost() but we're still connecting"); #endif d->pendingClose = true; return; } #ifdef QT3_SUPPORT emit connectionClosed(); // compat signal #endif // Disable and delete read notification if (d->socketEngine) d->socketEngine->setReadNotificationEnabled(false); if (d->abortCalled) { #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::disconnectFromHost() aborting immediately"); #endif } else { // Perhaps emit closing() if (d->state != ClosingState) { d->state = ClosingState; #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::disconnectFromHost() emits stateChanged()(ClosingState)"); #endif emit stateChanged(d->state); } else { #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::disconnectFromHost() return from delayed close"); #endif } // Wait for pending data to be written. if (d->socketEngine && d->socketEngine->isValid() && d->writeBuffer.size() > 0) { d->socketEngine->setWriteNotificationEnabled(true); #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::disconnectFromHost() delaying disconnect"); #endif return; } else { #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::disconnectFromHost() disconnecting immediately"); #endif } } SocketState previousState = d->state; d->resetSocketLayer(); d->state = UnconnectedState; emit stateChanged(d->state); emit readChannelFinished(); // we got an EOF #ifdef QT3_SUPPORT emit delayedCloseFinished(); // compat signal #endif // only emit disconnected if we were connected before if (previousState == ConnectedState || previousState == ClosingState) emit disconnected(); d->localPort = 0; d->peerPort = 0; d->localAddress.clear(); d->peerAddress.clear(); #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::disconnectFromHost() disconnected!"); #endif if (d->closeCalled) { #if defined(QABSTRACTSOCKET_DEBUG) qDebug("QAbstractSocket::disconnectFromHost() closed!"); #endif d->readBuffer.clear(); d->writeBuffer.clear(); QIODevice::close(); } } /*! Returns the size of the internal read buffer. This limits the amount of data that the client can receive before you call read() or readAll(). A read buffer size of 0 (the default) means that the buffer has no size limit, ensuring that no data is lost. \sa setReadBufferSize(), read() */ qint64 QAbstractSocket::readBufferSize() const { return d_func()->readBufferMaxSize; } /*! Sets the size of QAbstractSocket's internal read buffer to be \a size bytes. If the buffer size is limited to a certain size, QAbstractSocket won't buffer more than this size of data. Exceptionally, a buffer size of 0 means that the read buffer is unlimited and all incoming data is buffered. This is the default. This option is useful if you only read the data at certain points in time (e.g., in a real-time streaming application) or if you want to protect your socket against receiving too much data, which may eventually cause your application to run out of memory. Only QTcpSocket uses QAbstractSocket's internal buffer; QUdpSocket does not use any buffering at all, but rather relies on the implicit buffering provided by the operating system. Because of this, calling this function on QUdpSocket has no effect. \sa readBufferSize(), read() */ void QAbstractSocket::setReadBufferSize(qint64 size) { Q_D(QAbstractSocket); #ifndef QT_NO_OPENSSL // Manual polymorphism; setReadBufferSize() isn't virtual, but QSslSocket overloads // it. if (QSslSocket *socket = qobject_cast(this)) { socket->setReadBufferSize(size); return; } #endif if (d->readBufferMaxSize == size) return; d->readBufferMaxSize = size; if (!d->readSocketNotifierCalled && d->socketEngine) { // ensure that the read notification is enabled if we've now got // room in the read buffer // but only if we're not inside canReadNotification -- that will take care on its own if (size == 0 || d->readBuffer.size() < size) d->socketEngine->setReadNotificationEnabled(true); } } /*! Returns the state of the socket. \sa error() */ QAbstractSocket::SocketState QAbstractSocket::state() const { return d_func()->state; } /*! Sets the state of the socket to \a state. \sa state() */ void QAbstractSocket::setSocketState(SocketState state) { d_func()->state = state; } /*! Returns the socket type (TCP, UDP, or other). \sa QTcpSocket, QUdpSocket */ QAbstractSocket::SocketType QAbstractSocket::socketType() const { return d_func()->socketType; } /*! Returns the type of error that last occurred. \sa state(), errorString() */ QAbstractSocket::SocketError QAbstractSocket::error() const { return d_func()->socketError; } /*! Sets the type of error that last occurred to \a socketError. \sa setSocketState(), setErrorString() */ void QAbstractSocket::setSocketError(SocketError socketError) { d_func()->socketError = socketError; } #ifndef QT_NO_NETWORKPROXY /*! \since 4.1 Sets the explicit network proxy for this socket to \a networkProxy. To disable the use of a proxy for this socket, use the QNetworkProxy::NoProxy proxy type: \snippet doc/src/snippets/code/src_network_socket_qabstractsocket.cpp 3 The default value for the proxy is QNetworkProxy::DefaultProxy, which means the socket will use the application settings: if a proxy is set with QNetworkProxy::setApplicationProxy, it will use that; otherwise, if a factory is set with QNetworkProxyFactory::setApplicationProxyFactory, it will query that factory with type QNetworkProxyQuery::TcpSocket. \sa proxy(), QNetworkProxy, QNetworkProxyFactory::queryProxy() */ void QAbstractSocket::setProxy(const QNetworkProxy &networkProxy) { Q_D(QAbstractSocket); d->proxy = networkProxy; } /*! \since 4.1 Returns the network proxy for this socket. By default QNetworkProxy::DefaultProxy is used, which means this socket will query the default proxy settings for the application. \sa setProxy(), QNetworkProxy, QNetworkProxyFactory */ QNetworkProxy QAbstractSocket::proxy() const { Q_D(const QAbstractSocket); return d->proxy; } #endif // QT_NO_NETWORKPROXY #ifdef QT3_SUPPORT /*! \enum QAbstractSocket::Error \compat Use QAbstractSocket::SocketError instead. \value ErrConnectionRefused Use QAbstractSocket::ConnectionRefusedError instead. \value ErrHostNotFound Use QAbstractSocket::HostNotFoundError instead. \value ErrSocketRead Use QAbstractSocket::UnknownSocketError instead. */ /*! \typedef QAbstractSocket::State \compat Use QAbstractSocket::SocketState instead. \table \header \o Qt 3 enum value \o Qt 4 enum value \row \o \c Idle \o \l UnconnectedState \row \o \c HostLookup \o \l HostLookupState \row \o \c Connecting \o \l ConnectingState \row \o \c Connected \o \l ConnectedState \row \o \c Closing \o \l ClosingState \row \o \c Connection \o \l ConnectedState \endtable */ /*! \fn int QAbstractSocket::socket() const Use socketDescriptor() instead. */ /*! \fn void QAbstractSocket::setSocket(int socket) Use setSocketDescriptor() instead. */ /*! \fn Q_ULONG QAbstractSocket::waitForMore(int msecs, bool *timeout = 0) const Use waitForReadyRead() instead. \oldcode bool timeout; Q_ULONG numBytes = socket->waitForMore(30000, &timeout); \newcode qint64 numBytes = 0; if (socket->waitForReadyRead(msecs)) numBytes = socket->bytesAvailable(); bool timeout = (error() == QAbstractSocket::SocketTimeoutError); \endcode \sa waitForReadyRead(), bytesAvailable(), error(), SocketTimeoutError */ /*! \fn void QAbstractSocket::connectionClosed() Use disconnected() instead. */ /*! \fn void QAbstractSocket::delayedCloseFinished() Use disconnected() instead. */ #endif // QT3_SUPPORT #ifndef QT_NO_DEBUG_STREAM Q_NETWORK_EXPORT QDebug operator<<(QDebug debug, QAbstractSocket::SocketError error) { switch (error) { case QAbstractSocket::ConnectionRefusedError: debug << "QAbstractSocket::ConnectionRefusedError"; break; case QAbstractSocket::RemoteHostClosedError: debug << "QAbstractSocket::RemoteHostClosedError"; break; case QAbstractSocket::HostNotFoundError: debug << "QAbstractSocket::HostNotFoundError"; break; case QAbstractSocket::SocketAccessError: debug << "QAbstractSocket::SocketAccessError"; break; case QAbstractSocket::SocketResourceError: debug << "QAbstractSocket::SocketResourceError"; break; case QAbstractSocket::SocketTimeoutError: debug << "QAbstractSocket::SocketTimeoutError"; break; case QAbstractSocket::DatagramTooLargeError: debug << "QAbstractSocket::DatagramTooLargeError"; break; case QAbstractSocket::NetworkError: debug << "QAbstractSocket::NetworkError"; break; case QAbstractSocket::AddressInUseError: debug << "QAbstractSocket::AddressInUseError"; break; case QAbstractSocket::SocketAddressNotAvailableError: debug << "QAbstractSocket::SocketAddressNotAvailableError"; break; case QAbstractSocket::UnsupportedSocketOperationError: debug << "QAbstractSocket::UnsupportedSocketOperationError"; break; case QAbstractSocket::UnfinishedSocketOperationError: debug << "QAbstractSocket::UnfinishedSocketOperationError"; break; case QAbstractSocket::ProxyAuthenticationRequiredError: debug << "QAbstractSocket::ProxyAuthenticationRequiredError"; break; case QAbstractSocket::UnknownSocketError: debug << "QAbstractSocket::UnknownSocketError"; break; case QAbstractSocket::ProxyConnectionRefusedError: debug << "QAbstractSocket::ProxyConnectionRefusedError"; break; case QAbstractSocket::ProxyConnectionClosedError: debug << "QAbstractSocket::ProxyConnectionClosedError"; break; case QAbstractSocket::ProxyConnectionTimeoutError: debug << "QAbstractSocket::ProxyConnectionTimeoutError"; break; case QAbstractSocket::ProxyNotFoundError: debug << "QAbstractSocket::ProxyNotFoundError"; break; case QAbstractSocket::ProxyProtocolError: debug << "QAbstractSocket::ProxyProtocolError"; break; default: debug << "QAbstractSocket::SocketError(" << int(error) << ")"; break; } return debug; } Q_NETWORK_EXPORT QDebug operator<<(QDebug debug, QAbstractSocket::SocketState state) { switch (state) { case QAbstractSocket::UnconnectedState: debug << "QAbstractSocket::UnconnectedState"; break; case QAbstractSocket::HostLookupState: debug << "QAbstractSocket::HostLookupState"; break; case QAbstractSocket::ConnectingState: debug << "QAbstractSocket::ConnectingState"; break; case QAbstractSocket::ConnectedState: debug << "QAbstractSocket::ConnectedState"; break; case QAbstractSocket::BoundState: debug << "QAbstractSocket::BoundState"; break; case QAbstractSocket::ListeningState: debug << "QAbstractSocket::ListeningState"; break; case QAbstractSocket::ClosingState: debug << "QAbstractSocket::ClosingState"; break; default: debug << "QAbstractSocket::SocketState(" << int(state) << ")"; break; } return debug; } #endif QT_END_NAMESPACE #include "moc_qabstractsocket.cpp"