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q3serversocket.cpp

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#include "q3serversocket.h"

#ifndef QT_NO_NETWORK

#include "qsocketnotifier.h"

class Q3ServerSocketPrivate {
public:
    Q3ServerSocketPrivate(): s(0), n(0) {}
    ~Q3ServerSocketPrivate() { delete n; delete s; }
    Q3SocketDevice *s;
    QSocketNotifier *n;
};


/*!
    \class Q3ServerSocket qserversocket.h
    \brief The Q3ServerSocket class provides a TCP-based server.

    \compat

    This class is a convenience class for accepting incoming TCP
    connections. You can specify the port or have Q3ServerSocket pick
    one, and listen on just one address or on all the machine's
    addresses.

    Using the API is very simple: subclass Q3ServerSocket, call the
    constructor of your choice, and implement newConnection() to
    handle new incoming connections. There is nothing more to do.

    (Note that due to lack of support in the underlying APIs,
    Q3ServerSocket cannot accept or reject connections conditionally.)

    \sa Q3Socket, Q3SocketDevice, QHostAddress, QSocketNotifier
*/


/*!
    Creates a server socket object, that will serve the given \a port
    on all the addresses of this host. If \a port is 0, Q3ServerSocket
    will pick a suitable port in a system-dependent manner. Use \a
    backlog to specify how many pending connections the server can
    have.

    The \a parent and \a name arguments are passed on to the QObject
    constructor.

    \warning On Tru64 Unix systems a value of 0 for \a backlog means
    that you don't accept any connections at all; you should specify a
    value larger than 0.
*/

00096 Q3ServerSocket::Q3ServerSocket( Q_UINT16 port, int backlog,
                        QObject *parent, const char *name )
    : QObject( parent, name )
{
    d = new Q3ServerSocketPrivate;
    init( QHostAddress(), port, backlog );
}


/*!
    Creates a server socket object, that will serve the given \a port
    only on the given \a address. Use \a backlog to specify how many
    pending connections the server can have.

    The \a parent and \a name arguments are passed on to the QObject
    constructor.

    \warning On Tru64 Unix systems a value of 0 for \a backlog means
    that you don't accept any connections at all; you should specify a
    value larger than 0.
*/

00118 Q3ServerSocket::Q3ServerSocket( const QHostAddress & address, Q_UINT16 port,
                        int backlog,
                        QObject *parent, const char *name )
    : QObject( parent, name )
{
    d = new Q3ServerSocketPrivate;
    init( address, port, backlog );
}


/*!
    Construct an empty server socket.

    This constructor, in combination with setSocket(), allows us to
    use the Q3ServerSocket class as a wrapper for other socket types
    (e.g. Unix Domain Sockets under Unix).

    The \a parent and \a name arguments are passed on to the QObject
    constructor.

    \sa setSocket()
*/

00141 Q3ServerSocket::Q3ServerSocket( QObject *parent, const char *name )
    : QObject( parent, name )
{
    d = new Q3ServerSocketPrivate;
}


/*!
    Returns true if the construction succeeded; otherwise returns false.
*/
00151 bool Q3ServerSocket::ok() const
{
    return !!d->s;
}

/*
  The common bit of the constructors.
 */
void Q3ServerSocket::init( const QHostAddress & address, Q_UINT16 port, int backlog )
{
    d->s = new Q3SocketDevice( Q3SocketDevice::Stream, address.isIPv4Address()
                        ? Q3SocketDevice::IPv4 : Q3SocketDevice::IPv6, 0 );
#if !defined(Q_OS_WIN32)
    // Under Unix, we want to be able to use the port, even if a socket on the
    // same address-port is in TIME_WAIT. Under Windows this is possible anyway
    // -- furthermore, the meaning of reusable is different: it means that you
    // can use the same address-port for multiple listening sockets.
    d->s->setAddressReusable( true );
#endif
    if ( d->s->bind( address, port )
      && d->s->listen( backlog ) )
    {
      d->n = new QSocketNotifier( d->s->socket(), QSocketNotifier::Read,
                            this, "accepting new connections" );
      connect( d->n, SIGNAL(activated(int)),
             this, SLOT(incomingConnection(int)) );
    } else {
      qWarning( "Q3ServerSocket: failed to bind or listen to the socket" );
      delete d->s;
      d->s = 0;
    }
}


/*!
    Destroys the socket.

    This causes any backlogged connections (connections that have
    reached the host, but not yet been completely set up by calling
    Q3SocketDevice::accept()) to be severed.

    Existing connections continue to exist; this only affects the
    acceptance of new connections.
*/
00195 Q3ServerSocket::~Q3ServerSocket()
{
    delete d;
}


/*!
    \fn void Q3ServerSocket::newConnection( int socket )

    This pure virtual function is responsible for setting up a new
    incoming connection. \a socket is the fd (file descriptor) for the
    newly accepted connection.
*/


void Q3ServerSocket::incomingConnection( int )
{
    int fd = d->s->accept();
    if ( fd >= 0 )
      newConnection( fd );
}


/*!
    Returns the port number on which this server socket listens. This
    is always non-zero; if you specify 0 in the constructor,
    Q3ServerSocket will pick a non-zero port itself. ok() must be true
    before calling this function.

    \sa address() Q3SocketDevice::port()
*/
00226 Q_UINT16 Q3ServerSocket::port() const
{
    if ( !d || !d->s )
      return 0;
    return d->s->port();
}


/*!
    Returns the operating system socket.
*/
00237 int Q3ServerSocket::socket() const
{
    if ( !d || !d->s )
      return -1;

    return d->s->socket();
}

/*!
    Returns the address on which this object listens, or 0.0.0.0 if
    this object listens on more than one address. ok() must be true
    before calling this function.

    \sa port() Q3SocketDevice::address()
*/
00252 QHostAddress Q3ServerSocket::address() const
{
    if ( !d || !d->s )
      return QHostAddress();

    return d->s->address();
}


/*!
    Returns a pointer to the internal socket device. The returned
    pointer is 0 if there is no connection or pending connection.

    There is normally no need to manipulate the socket device directly
    since this class does all the necessary setup for most client or
    server socket applications.
*/
00269 Q3SocketDevice *Q3ServerSocket::socketDevice()
{
    if ( !d )
      return 0;

    return d->s;
}


/*!
    Sets the socket to use \a socket. bind() and listen() should
    already have been called for \a socket.

    This allows us to use the Q3ServerSocket class as a wrapper for
    other socket types (e.g. Unix Domain Sockets).
*/
00285 void Q3ServerSocket::setSocket( int socket )
{
    delete d;
    d = new Q3ServerSocketPrivate;
    d->s = new Q3SocketDevice( socket, Q3SocketDevice::Stream );
    d->n = new QSocketNotifier( d->s->socket(), QSocketNotifier::Read,
             this, "accepting new connections" );
    connect( d->n, SIGNAL(activated(int)),
           this, SLOT(incomingConnection(int)) );
}

#endif //QT_NO_NETWORK

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