Re: CVS commit: src/sys/sys

[Jason Thorpe <thorpej%shagadelic.org@localhost>]

On Dec 19, 2005, at 10:01 PM, Hubert Feyrer wrote:

> On Tue, 20 Dec 2005, YAMAMOTO Takashi wrote:
> > > This is probably a very stupid question, but... what I wonder is  
> > > how to
> > > get a "struct device foodev" that way,
> > you can't.  you don't need to do so, if you make it really opaque.
> What does "opaque" mean? I wonder where all those things come from  
> that these pointers point to... X-)
"opaque" means you can't see into it.  You don't know, or care, if  
it's an int, a pointer, a float, whatever.
> (Yes, I'm aware that this is a very newbie question... I fetched  
> myself a bloody nose again trying to dig into our kernel, and still  
> have no real idea where to start; I'm aware that this is probably  
> not the best point?)
Opaque types are hardly limited to the kernel.  pthread_t is an  
opaque type, for example.
-- thorpej