How to compile 'struct module' usage?

[Ian Lepore]

On Mon, 2019-12-16 at 17:26 +0000, Kenneth M. Glassey wrote:
> Hello, I am doing some fiddling on a driver port and I am
> encountering
>  a compilation error "incomplete definition of type struct module"
> concerning lines in the port source that access members of struct
> module,
> such as module->name. Looking into the issue, it seems that struct
> module
> is not defined in the headers, at least not in sys/module.h, but I
> did see
> some definitions in *.c files elsewhere.
> 
> To check whether this was a problem specifically due to this driver,
> I
> made a simple module following one of the tutorials online and it
> compiled
> fine. I then added a line that accessed module->name and I got the
> compilation error.
> 
> So how do we build a module to allow the use of the members of struct
> module? Is the struct module definition supposed to be constructed at
> compile time, and if so, how? Or is it verboten to access members of
> that
> struct?
> 
> Thanks!
> 
> Kenneth
> 

The definition of struct module is private by design.  You need to use
the existing accessor functions such as module_getname(),
module_file(), etc (which are likely not well-documented anywhere, but
can be found in kern_module.c).

-- Ian