Re: Question about EXPORT_SYMBOL

[John Levon <moz@compsoc.man.ac.uk>]

On Mon, 19 Feb 2001, Gigi Sullivan wrote:

> Aiee :)
> 
>    Hello!
> 
> On Mon, Feb 19, 2001 at 02:51:38PM +0000, John Levon wrote:
> > You can either add MOD_INC/DEC_USE_COUNTs to your system call code (although this will still
> > leave a very tiny race window), or make the module not unloadable by using can_unload().
> 
>    I saw that can_unload is a function pointer of the module structure, but
>    how can I play with this?
> 
>    Can I set this function pointer to point to a my-own routine (implemented
>    inside the module)? How?
> 
>    BTW, which are the advantages of using can_unload?
> 
> bye bye && Thanks!
> 
>                            -- gg sullivan
> 
> 

Read the documentation in the 2.4.1ac series kernels (in the DocBook directory).

Basically your own "can_unload" routine should return 0 if the module is currently unloadable
or -EBUSY if it can't

john

-- 
"Allocation is a fatal error."
	- me, cpd_util.c. Never document at 4AM

-
Kernelnewbies: Help each other learn about the Linux kernel.
Archive:       http://mail.nl.linux.org/
IRC Channel:   irc.openprojects.net / #kernelnewbies
Web Page:      http://www.surriel.com/kernelnewbies.shtml