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Linux 2.6

1

Hellomod.c

001

Hello World driver for Linux 2.6

#include <linux/module.h>/* All modules use header files module.h*/

#include <linux/kernel.h>/*kernel.h contains common kernel functions */

#inlcude <linux/init.h>/* init.h contains macros _init and _exit they allow free memory */

/* Header File */

Static Int_init lkp_init (void)

{

PRINTK ("<1>hello,world!     From the kernel space ... \ n "); /* Module initialization, PRINTK function

Equivalent to the printf output function in c,<1> immediate output */

return 0;

}

Static Void_exit lkp_cleanup (void)

{

PRINTK ("<1>goodbye,world! Leaving kernel space...\n ");

}

Module_init (Lkp_init); /* Entry point */

Module_exit (Lkp_cleanup); /* loadable module, the kernel calls the Lkp_cleanup function here */

Module_license ("GPL"); /* Hint no GNU Public License */

Module_init () and Cleanup_exit

Module_init () New functionality provided to the kernel to register the module

Cleanup_exit () Logout of new features provided by the module

C Language Application kernel module program

Using Functions libc Library kernel functions

Run space user space kernel space

Run permissions for normal user Super User

Entry function Main () Module_init ()

Exit Function exit () Module_exit ()

Compiling gcc-c Makefile

Connecting GCC Insmod

Run Direct Run Insmod

Debug                     Gdb kdbug kdb kgdb

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Linux kernel Linux kernel travel