Re: How does Fiasco implement printf

Adam Lackorzynski <[email protected]> Sun, 22 Jun 2014 23:29:37 +0200

Newsgroups	gmane.comp.micro-kernel.l4.devel
Message-ID	<[email protected]>

Hi,

On Fri Jun 20, 2014 at 17:11:21 -0400, Yuxin Ren wrote:
> I think printf usually invoke system call. But in Fiasco only one system
> call is capability invocation. So what capability is invoked by printf? Or
> Fiasco implements printf in user level, so printf triggers a normal IPC?

Since capability invocation and IPC is the same it's actually both.
Each task has a 'log' capability which is used to print out text. printf
and friends also uses this interface pass on output.

Adam
-- 
Adam                 [email protected]
  Lackorzynski         http://os.inf.tu-dresden.de/~adam/