codingfreak

We know that ls command in unix displays the list of files in a directory. It has various options to display the data in various styles and...

Checking out machine hardware information is no more a geeky thing of olden days where you need to go through the hardware specification doc...

Part 1: Buffer Overflows

SSH is the common way to connect remote machines these days. Almost all kinds of applications use SSH in background for communicating with e...

A Linux process works either in foreground or background. A process running in foreground can interact with the user in front of the termi...

Continuation after PART-2 . Notifying Events on a Chain  Notifications are generated with notifier_call_chain . This function simply inv...

Continuation after PART-1 . Check the PART-3 .  Blocking Notifier chains A blocking notifier chain runs in the process context. The cal...

Linux is a monolithic kernel. Its subsystems or modules help to keep the kernel light by being flexible enough to load and unload at runtime...

Many times we come across hopeless situations where a program when compiled and installed in GNU/Linux just fails to run. Then we have to tr...

Atlast the day has come, LINUX running on my laptop(pre-loaded with M$ VISTA). Time for celebrations. So I decided to drop a post on how t...

Using " recent " match option in iptables we can match recent connections, and perform simple throttling operation on incoming ...

Static libraries are simply a collection of ordinary object files . For more information on shared libraries checkout - Creating and using...

Check the PART1 of this article. 4. Making the library available at run-time Using LD_LIBRARY_PATH We have to create or set the enviro...

What is a Shared Library ?? A library that is loaded into physical memory only once and reused by multiple processes via virtual memory. ...

' find ' is one of the useful commands available in Unix/Linux systems. In this article I am trying to use ' find ' in a eff...

Blocking a signal means telling the operating system to hold it and deliver it later when it is unblocked. Between the time when it is gener...

The sigaction system call has the same basic effect as signal system call: to specify how a signal should be handled by the process. But s...

The simplest way to change the action for a signal is to use the signal system call. You can specify a built-in action (such as to ignore t...

TO list all the users who can access a Linux machine we have to access the /etc/passwd file, which stores information about all registered ...

Besides signals that are generated as a result of a hardware trap or interrupt, your program can explicitly send signals to itself or to ano...