Interaction with L4

Peter Nguyen peter.nguyen at ...29...
Sat Jan 30 03:58:13 CET 2010

Whoops, my mistake. The buffer is actually being mapped, there are some things
I'm doing wrong at me end. Apologies.


Quoting Peter Nguyen <peter.nguyen at ...29...>:

>  > Is 'sampbuffer' declared as a local variable? If yes, this would
> > explain the problem. When the program leaves the scope where
> > 'sampbuffer' is declared, the destructor of 'Io_mem_connection'
> > gets executed. By default, this destructor closes the session such
> > that the session's dataspace gets destroyed. You can solve this
> > problem in two ways. First, it is possible to tell 'sampbuffer'
> > to keep the session open after the destuctor is called:
> >
> >   sampbuffer.on_destruction(Io_mem_connection::KEEP_OPEN);
> >
> > Another solution would be declaring 'sampbuffer' als local static
> > variable. Once constructed, one object instance will exist for the
> > whole runtime of the program. Of course, you could also explicitely
> > manage the lifetime of 'sampbuffer' by using the 'new' operator but
> > in most cases (if you need one session during the whole execution
> > time), a declaring the connection object as local static variable
> > is most convenient.
> The sampbuffer variable is not declared as a local variable. I have also
> tried
> keeping the session open as you suggested, but with no success. Just for the
> record, the message I keep getting is the following:
> no RM attachment (READ pf_addr=20 pf_ip=2001248 from 08)virtual void
> Genode::Signal_session_component::submit(Genode::Signal_context_capability,
> unsigned int): invalid signal-context capability
> Peter
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