Re: Question about EXPORT_SYMBOL

[Sourav Sen <sourav@csa.iisc.ernet.in>]

Hello,
	As far as I know, by EXPORT_SYMBOL you can only make those symbols
visible to the rest of the kernel. For having your own entry points You
have to have system calls. But there is a trick there, what you can do is
you can implement some dummy system calls, then
"replace" them by your functions in your module, so that you need not
compile kernel each time you change something. The mechanism is given in
"Linux module programmer's guide" in the section "system calls". I have a
local mirror of that in:

http://www2.csa.iisc.ernet.in/~sourav/linux/linux/linux_moduleprog/lkmpg-1.1.0.html/node20.html

But I have never tried to do that. So If u do that way and suceed, plz.
lemme know.

Bye
sourav
--------------------------------------------------------------------------------

On Sat, 17 Feb 2001, Tiziano Fagni wrote:

> Hi,
> suppose I have writed a new device driver and I want to export a function 
> that must be used from a process in user space. (such open(), close(), 
> etc...). Can I use for this the macro EXPORT_SYMBOL?  If not, I must write a 
> new system call? With the macro EXPORT_SYMBOL I can only export new function 
> visible at kernel level? What is the best way to export a function for user 
> space?
> 
> Thanks to all!!
> Tiziano 
> 
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