Re: Problems compiling kernel modules

[Lei Yang]

Hi friends,

I've askeed questions about errors compiling kernel modules caused by 
including <stdio.h> and got some very helpful info here.

I changed those I/O stream and file operation in the code and get the 
module compiled, however, there would be warnings like

In file included from /home/lei/modules/test.c:49:
/home/lei/modules/Kcomp.h:21: warning: function declaration isn't a 
prototype
/home/lei/modules/Kcomp.h:27: warning: function declaration isn't a 
prototype
/home/lei/modules/Kcomp.h:69: warning: function declaration isn't a 
prototype

And the no prototype fuction looks like

int preset() // with no arguments
{
	p = &nodes[0][0];
	return 0;
}


So when I tried to install the module with insmod ./test.ko ,
there would be an error,

insmod: error inserting './test.ko': -1 Unknown symbol in module

Could anyone tell me what is wrong here? Is that because of the no 
prototype function declaration?

TIA
Lei

Lee Revell wrote:
> On Sat, 2004-08-21 at 16:46, Lei Yang wrote:
>
> > What about multi-file module?
> >
> > Say test.c doesn't include stdio.h, while there is some other .c file 
> > which is to be compiled and linked into test.ko, include stdio?
> >
> > Would that work?
>
>
> Are you just trying to print from a kernel module?  Use printk.
>
> The kernel does not really have its own standard input and standard
> output - the kernel manages those things for processes.
>
> Lee
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