Details
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Bug
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Resolution: Done
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P3: Somewhat important
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4.7.4, 4.8.0
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None
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Windows 7 x64, Ubuntu 11.10 x64
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3a57243fbffb771c0991c99d93ac9b9fcf4fc4ee (4.8), 46e4a9d5231e2d9e35424259858713ca539b8e30 (5.0)
Description
On Windows 7 with Qt 4.8, socket options for KeepAlive and LowDelay always return value -256. It doesn't change when we enable or disable this option.
On Ubuntu 11.10 with Qt 4.7.4, these options always return 0.
Maybe I'm doing something wrong, but here's a code to test it. It creates a server and a client socket, which firstly connects with disabled options and checks their values, then it does the same with enabled options. You can copy the code below or download the files from attachment.
// connector.h
#ifndef CONNECTOR_H
#define CONNECTOR_H
#include <QObject>
#include <QHostAddress>
class QTcpServer;
class QTcpSocket;
class Connector : public QObject
{
Q_OBJECT
public:
explicit Connector(QObject *parent = 0);
public slots:
void listen (QHostAddress address, int port);
void setOptionsEnabled(bool enabled);
void connectToHost (QString host, int port);
void disconnectFromHost();
private:
QTcpSocket* clientSocket;
QTcpServer* server;
bool optionsEnabled;
private slots:
void connected();
};
#endif // CONNECTOR_H
// connector.cpp
#include <QTcpServer>
#include <QTcpSocket>
#include "connector.h"
Connector::Connector (QObject *parent) :
QObject(parent)
{
}
void Connector::setOptionsEnabled (bool enabled)
{
optionsEnabled = enabled;
}
void Connector::listen (QHostAddress address, int port)
{
server = new QTcpServer(this);
server->listen(address, port);
}
void Connector::connectToHost (QString host, int port)
{
clientSocket = new QTcpSocket(this);
clientSocket->setSocketOption(QAbstractSocket::KeepAliveOption, optionsEnabled ? 1 : 0);
clientSocket->setSocketOption(QAbstractSocket::LowDelayOption, optionsEnabled ? 1 : 0);
connect (clientSocket, SIGNAL(connected()), this, SLOT(connected()));
clientSocket->connectToHost(host, port);
clientSocket->waitForConnected(-1);
}
void Connector::disconnectFromHost()
{
clientSocket->disconnectFromHost();
if (clientSocket->state() != QAbstractSocket::UnconnectedState)
clientSocket->waitForDisconnected(-1);
delete clientSocket;
}
void Connector::connected()
{
qDebug() << "keep alive" << clientSocket->socketOption(QAbstractSocket::KeepAliveOption) << "\n"
<< "low delay" << clientSocket->socketOption(QAbstractSocket::LowDelayOption) << "\n";
}
// main.cpp
#include <QtCore/QCoreApplication>
#include <QHostAddress>
#include "connector.h"
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
Connector connector;
connector.listen(QHostAddress::Any, 8888);
qDebug() << "options set to false";
connector.setOptionsEnabled(false);
connector.connectToHost("localhost", 8888);
connector.disconnectFromHost();
qDebug() << "options set to true";
connector.setOptionsEnabled(false);
connector.connectToHost("localhost", 8888);
return a.exec();
}
// socket-options-test.pro
QT += core network
QT -= gui
TARGET = socket-options-test
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
SOURCES += main.cpp \
connector.cpp
HEADERS += \
connector.h