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QAbstractSocket: do not fail writing on read buffer overflow

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canReadNotification() could return 'false' if either the socket has
been closed, or the read buffer has reached the maximum size. Because of
this duality, waitForBytesWritten() should not fail as a result of a
canReadNotification() call.

Change-Id: I9a15fa174a3b982a7ce404913caa38fc19f64622
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Markus Goetz (Woboq GmbH) <markus@woboq.com>
This commit is contained in:
Alex Trotsenko 2016-02-17 17:55:41 +02:00
parent d930c8b5fc
commit bec47545dc
2 changed files with 40 additions and 4 deletions
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9
src/network/socket/qabstractsocket.cpp
View File

@ -2253,8 +2253,10 @@ bool QAbstractSocket::waitForBytesWritten(int msecs)
forever {
bool readyToRead = false;
bool readyToWrite = false;
if (!d->socketEngine->waitForReadOrWrite(&readyToRead, &readyToWrite, true, !d->writeBuffer.isEmpty(),
qt_subtract_from_timeout(msecs, stopWatch.elapsed()))) {
if (!d->socketEngine->waitForReadOrWrite(&readyToRead, &readyToWrite,
!d->readBufferMaxSize || d->buffer.size() < d->readBufferMaxSize,
!d->writeBuffer.isEmpty(),
qt_subtract_from_timeout(msecs, stopWatch.elapsed()))) {
#if defined (QABSTRACTSOCKET_DEBUG)
qDebug("QAbstractSocket::waitForBytesWritten(%i) failed (%i, %s)",
msecs, d->socketEngine->error(), d->socketEngine->errorString().toLatin1().constData());
@ -2269,8 +2271,7 @@ bool QAbstractSocket::waitForBytesWritten(int msecs)
#if defined (QABSTRACTSOCKET_DEBUG)
qDebug("QAbstractSocket::waitForBytesWritten calls canReadNotification");
#endif
if(!d->canReadNotification())
return false;
d->canReadNotification();
}

35
tests/auto/network/socket/qtcpsocket/tst_qtcpsocket.cpp
View File

@ -197,6 +197,7 @@ private slots:
void clientSendDataOnDelayedDisconnect();
void serverDisconnectWithBuffered();
void socketDiscardDataInWriteMode();
void writeOnReadBufferOverflow();
void readNotificationsAfterBind();
protected slots:
@ -3067,6 +3068,40 @@ void tst_QTcpSocket::socketDiscardDataInWriteMode()
delete socket;
}
// Test waitForBytesWritten() does not fail on read buffer overflow
void tst_QTcpSocket::writeOnReadBufferOverflow()
{
QFETCH_GLOBAL(bool, setProxy);
if (setProxy)
return;
QTcpServer tcpServer;
QTcpSocket *socket = newSocket();
QVERIFY(tcpServer.listen(QHostAddress::LocalHost));
socket->setReadBufferSize(1);
socket->connectToHost(tcpServer.serverAddress(), tcpServer.serverPort());
QVERIFY(socket->waitForConnected(5000));
QCOMPARE(socket->state(), QAbstractSocket::ConnectedState);
// Accept connection on server side
QVERIFY2(tcpServer.waitForNewConnection(5000), "Network timeout");
QTcpSocket *newConnection = tcpServer.nextPendingConnection();
QVERIFY(newConnection != nullptr);
QCOMPARE(newConnection->write("1", 2), Q_INT64_C(2));
QVERIFY(newConnection->flush());
// Wait for buffer overflow
QVERIFY(socket->waitForReadyRead(5000));
QCOMPARE(socket->bytesAvailable(), Q_INT64_C(1));
// Write data and wait for successful send
QVERIFY(socket->putChar(0));
QVERIFY(socket->waitForBytesWritten(5000));
delete newConnection;
delete socket;
}
// Test that the socket does not enable the read notifications in bind()
void tst_QTcpSocket::readNotificationsAfterBind()
{