Hi Stefan,

In my test server side session function, if I use a core-created capability (via alloc_irq) it works.  If I try to do similar behavior locally, the capability appears to be valid (i.e., it exists in the jdb object table) but will not martial correctly - .valid() fails at the client side (note my server process has L4_BASE_FACTORY_CAP).

Can you enlighten me? I am clearly doing something wrong.


status_t Foo::Session_component::create(Genode::Native_capability& result_cap)
{
#if WORKS
  Genode::Foc_cpu_session_client cpu(Genode::env()->cpu_session_cap());
  result_cap = cpu.alloc_irq();
#endif

#if DOES_NOT_WORK
  Cap_index * i = Genode::cap_idx_alloc()->alloc_range(1);

  l4_msgtag_t res = l4_factory_create_irq(L4_BASE_FACTORY_CAP, i->kcap());
  assert(!l4_error(res));

  Genode::Native_capability ncap(i);
  result_cap = ncap;
#endif
}


BTW, I'm currently using Native_capabilities to test.  But I also do not know how to convert from a Native_capability to a typed capability. ;-) Can you show me?

Daniel
On 02/18/2013 01:15 AM, Stefan Kalkowski wrote:
Hi Daniel,

On 02/14/2013 08:33 PM, Daniel Waddington wrote:

Hi,
Can I pass Native_capability types as [out] parameters using
"Native_capability *" type - with the cross-process mapping happening? 
Most of the examples use only use the return value to do [out]
capabilities.  i.e. GENODE_RPC(Rpc_foo,int,foo,Genode::Native_capability
*) doesn't seem to work, but there might be something else afoot.

actually it should work the way you've described it. I've tested it
right now by extending the hello example the same way, and the
capability was successfully transfered to the calling client as an argument.
By the way, why do you use Native_capability instead of Capability?
Although both should work, I would use the generic Capability class,
especially in an interface.

Best regards
Stefan


Daniel


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