Dear All,
As we can see the device driver programs or even the programs which are system specific we can see that in those programs there are certain fixed files are included like:

#include <linux/init.h>
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/errno.h>

can anybody tell me the purpose of these files? or can anybody show me the tutorial where i can show the functions of these files, which can help me in my project to move faster.

Thanks,
Nishant

you can simply look at them in /usr/include/linux. generally there's a lot of commets for every function in header files.

In any program that relies upon some extra code (that is some code which is not in the file being compiled, such as code written by those device driver gurus) the compiler needs to know about these functions. The purpose of the #include is to tell the compiler where to look for the functions.

What the #include actually refers to is the header file which is a description of what the function will look like (the name of the function, what is returned and what needs to be passed into the function - the signature). This means that the compiler can check that you are calling the function correctly.

The linker will put all of the pieces together and so it is the linker that will need to add the actual code from these external function and your functions, creating your executable program.

Dear Graemef,

Thanks for the info dude, and you are right about the #include, but i want to know about the files which are included with the #include like <linux/init.h> and <linux/module.h> etc..., and as infestator, told me that there are comments available in the header about the functions available, i have to go that way if any option is not available, but that is a long way....

Thanks,
Nishant

Dear Infestator,

You are right that comments are available in the header file itself about the functions made in the file, but that could be the long way, that i ll visit each and every file and each function, instead i want the overview of those files, cos as i think these files are common, they wont do different works in each program where they are included?

Thanks,
Nishant