Hi, Please suggest some IDE's to Linux code navigation and development if possible. Thanks in advance, Sankara Rao Majji On Sun, May 3, 2020 at 10:49 AM Majji SankaraRao < sankar.linux.development@gmail.com> wrote:

Hi Valdis,

Thanks for your reply.

With your suggestions I have used the following code to test helloworld module and successfully saw "Hello World!' msg with dmesg command.

#include<linux/module.h> #include<linux/init.h> #include<linux/kernel.h>

MODULE_LICENSE("GPL"); MODULE_AUTHOR("Sankar"); MODULE_DESCRIPTION("Hello World Module");

static int __init helloworld_init(void) { printk(KERN_INFO "Hello world!\n"); return 0; }

static void __exit helloworld_exit(void) { printk(KERN_INFO "Cleaning up module.\n"); return; }

module_init(helloworld_init); module_exit(helloworld_exit);

BR, Sankar

On Sun, May 3, 2020 at 1:37 AM Valdis Klētnieks <valdis.kletnieks@vt.edu> wrote:

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On Sat, 02 May 2020 23:46:08 +0530, Majji SankaraRao said:

...

I want to practice writing modules in Linux version 5.3.0-51-generic. So please guide me by providing related documentation/Steps.

Create two functions, one for initializing your module, and one for cleaning up at exit.

static int __init init_my_module(void) { printk(KERN_DEBUG "Hello World!\n"); }

static void __exit exit_my_module(void) { printk(KERN_DEBUG "Say goodnight, Gracie\n"); } module_init(init_my_module); module_exit(exit_my_module);

Everything else isn't how to write a module, it's about how to write whatever code is needed for the function you're trying to add, whether it's a file system, or a new netfilter target, or a device driver, or a network congestion control module, or whatever...

And that code basically doesn't care if it's a module or if it's built in to the kernel.

So the question becomes: What did you want to do inside the kernel?