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A system call is used by application or user programs to request service from the operating systems. Since the user programs does not have direct access to the kernel whereas the OS has the direct access. OS can access the hardware through system calls only.
The following files has to be modified for implementing a system [...]

Continue reading Implementing a new system call in Kernel version 2.6.32

To demonstrate, let us goto a simple “Hello World” as a module and inserted in to the kernelStep 1Open any editor like vi or gedit in a shell prompt and the type the following/* Name of the file is hello.c */#include <linux/module.h>#include <linux/kernel.h>int init_module(void){printk(KERN_INFO “Hello world.n”);return 0;}void cleanup_module(void){printk(KERN_INFO “Goodbye worldn”);}The above is a simple [...]

Continue reading How to add a new Linux Kernel Module (LKM)

How to add a new kernel to linux OS and compile it and use it, the following points discusses that.Step 1: Download a new kernel from kernel.org (recent version is 2.6.33)Step 2: you may get the file either as a .tar.bz2 file  or .tar.gz file Step 3: untar the file in the /usr/src directory (for [...]

Continue reading Recompiling Linux Kernel