Netlink socket

f.vanalmetelevic.com

Hi,

I'm currently doing some experiments with a netlink socket to read a 1-wire iButton key. This works well when using native socket functions. However, it would be nice to have signal/slot functionality. Therefore, I would like to 'wrap' my native socket in a Qt object. Because it is a netlink socket, I think I have to use QAbstractSocket for that. First, I open a native socket and do a bind. When successful, I instantiate a QAbstractSocket :
@ s = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);

if (s == -1)
{
qDebug ("Socket problem");
return;
}

l_local.nl_family = AF_NETLINK;
l_local.nl_groups = 23;
l_local.nl_pid = getpid();

if (bind(s, (struct sockaddr *)&l_local, sizeof(struct sockaddr_nl)) == -1)
{
qDebug ("Bind problem");
::close(s);
}

QAbstractSocket *as = new QAbstractSocket(QAbstractSocket::UnknownSocketType, this);
if (!as->setSocketDescriptor(s, QAbstractSocket::ConnectedState))
{
qDebug ("Failed to assign native socket to QAbstractSocket");
}

connect (as, SIGNAL(readyRead()), this, SLOT(axisDataAvailable()));@

When I apply the key, the slot is never called. I also tested to read data from the QAbstractSocket, but with no success.
Do I miss something ? Can I do it like this or are there better approaches to do this ?

Filip

f.vanalmetelevic.com

Problem solved.
With QTcpSocket instead of QAbstractSocket, it looks like it's working fine.

yogesh

Hi Filip, it would be great if you can post a small working program shows netlink+Qt working.

f.vanalmetelevic.com

As I'm very busy on my job (you know...deadlines...), I just post a snippet of my code :

@
int m_sock;
struct sockaddr_nl l_local;
QTcpSocket m_mySocket;
/ open netlink socket */
m_sock = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);

if (m_sock == -1)
{
    qDebug ("Socket problem");
    return;
}

l_local.nl_family = AF_NETLINK;
l_local.nl_groups = 23;
l_local.nl_pid    = getpid();

if (bind(m_sock, (struct sockaddr *)&l_local, sizeof(struct sockaddr_nl)) == -1)
{
    qDebug ("Bind problem");
    close(m_sock);
    m_sock = 0;
    return;
}

m_mySocket = new QTcpSocket();
if (!m_mySocket->setSocketDescriptor(m_sock))
{
    qDebug ("Failed to assign native socket to QTcpSocket");
    close(m_sock);
    m_sock = 0;
    return;
}

connect (m_mySocket, SIGNAL(readyRead()), this, SLOT(netlinkDataAvailable()));@

Hope this will help you...
(Implemented this already some time ago, unfortunately not remembering all the details anymore right now.)

mohsen

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