Re: [LIP] kernel programming

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On Tue, 18 Nov 2003, suresh kumar wrote:

> Hi 
> I have the following queries. Kindly help me out.
> 
> 1)What is the difference among, module_init, init_module, __init,
> __init_data and their corresponding deinit function? How do we select
> what should be used?

__init tells the kernel that this memory can be freed after 
initialization. For description on module_init(), try reading Alessandro 
Rubini's "Linux Device drivers". It available online at www.xml.com

> 2)(I have used MODULE_PARAM macro to pass some arguments while insmod
> a module.  The program looks some thing like this. Kindly tell me
> where I have gone wrong. /* hello-5.c - Demonstrates command line
> argument passing to a module. */ #define __KERNEL__ #define MODULE
> #include <linux/module.h> #include <linux/kernel.h> #include
> <linux/init.h>
> 
> 
> static short int myshort = 1;
> MODULE_PARM (myshort, "h");
> static int __init hello_5_init(void)
> {
> 	printk("this is junk`");
> 	
> printk("Hello, world 5\n=============\n");
> printk("myshort is a short integer: %hd\n", myshort);
> return 0;
> }
> module_init(hello_5_init);
> module_deinit(hello_5_init);
> 
> insmod <name> <values>

What does it output? I don't want to have to cut paste, make your module 
to find out the output.

> 3)Proc is the image of the kernel which can be used to configure
> kernel at runtime. I want to do the same with the module that I write.
> kindly tell how this has to be done. It is known that it can be done
> using ioctls. For a bigger module, which has more configuration, which
> is advised, a)configuration through proc b) through CLI using ioctls.
> I mean the tradeoff in terms of flexibility, complexity, efficiency
> etc...

You seriously need to read the above book.
 
> 4)How do we set the IP address to the interface permanenly using
> ifconfig in redhat 9.0. Previous versions, I used to disable and set
> the interface and enable it.I remember it working.  Does it vary from
> distribution to distribution? I can not use setup or any thing else.

/etc/sysconfig/network-scripts/ifcfg-eth0
 
> 5) Ne one tell me good material to read for tasklets programming and
> kernel scheduling.

above book.

-- 
I'm an angel!!! Honest!
The horns are just there to hold the halo up straight.
-----------------------------------------------------
Amit Kucheria             | amitk@ NOSPAM ittc.ku.edu
Wireless Systems Engineer | 760-822-8529
Metric Systems Corp.      | Vista, CA 92083
-----------------------------------------------------



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