error: stdio.h: No such file or directory error during make

Question

I\'m trying to compile the following program in Ubuntu. But I keep getting the error: \"stdio.h: No such file or directory\" error.

#include 
         


        

Answer 1

The problem is you can't use printf() and stdio.h inside the kernel, and you don't use a main() function either. You need printk() and module.h

#include  /* Needed by all modules */
#include 

int init_module(void)
{
    printk(KERN_INFO "Hello world\n");

    return 0;
}

You should also have a exit()/cleanup() type function for when it unloads.

void clean_module(void)
{
    printk(KERN_INFO "Cleaning and exiting\n");
}

Then load the functions for the module:

module_init(init_module);
module_exit(clean_module);