Issue with _dbus_write_socket on windows

Timothy Vismor at
Fri Nov 17 13:57:58 PST 2006

On 11/17/06, Havoc Pennington <hp at> wrote:
> Ralf Habacker wrote:
> > Havoc Pennington schrieb:
> >> I don't know exactly, since I don't know how this works on Windows.
> >> What is the "fd" you pass to the daemon's --print-addr-fd function? Is
> >> it a pipe or a socket or what is it? On UNIX autolaunch does a
> >> fork/exec, what does it do on Windows?
> btw what is the answer here? (where do you guys have the windows code
> btw, can we look at the work in progress?)
> > We are thinking to store the recently used dbus address in the registry,
> > which allows the autolaunch code to detect a running dbus-daemon  and to
> > be able to connect to it.
> Maybe Windows should only have "autolaunch" and never start the daemon
> on login; unlike unix there might be a more reliable way to implement
> autolaunch. How does the registry solution work in terms of locking,
> i.e. say two buses start up simultaneously in the same session, one
> should exit and not be used. Is there a way to lock a registry entry or
> something that allows that to work?
> For the mugshot client we did single instance COM object with
> RegisterActiveObject() - that seems like one option. I'm not sure how it
> works if the user logs in multiple times (is that even possible?) though.
> Havoc

A common way to guarantee a unique instance of a Windows application
is to use a well known mutex name. A simple example is:


   HANDLE hMutex = ::CreateMutex( NULL, FALSE, "UniqueDBusInstanceMutex" );
    if( !hMutex )
        return( FALSE );

    DWORD GotMutex = ::WaitForSingleObject( hMutex, 10 );
    switch( GotMutex )
        case WAIT_ABANDONED:
                ::ReleaseMutex( hMutex );
                ::CloseHandle( hMutex );
                return( FALSE );
        case WAIT_FAILED:
        case WAIT_TIMEOUT:
                return( FALSE );
    // Save mutex handle for use during shutdown.
    m_hMutex = hMutex;


    // Relinquish control of the application mutex.
    ::ReleaseMutex( m_hMutex );
    ::CloseHandle( m_hMutex );
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