By default, it is difficult to get two processes to communicate with each other. As we’ve seen in a previous article, even parent and child processes don’t share the same memory space. So we need to find ways to establish inter-process communication. One of these communication mechanisms is the pipe. What is a Pipe? A pipe is a section of shared memory meant to facilitate the...
The available system calls to create or open, read, write, and delete a file in C all make use of a file descriptor. So let’s discover how the operating system handles references to open files and how to manipulate files in our programs. What is a File Descriptor? In Unix type systems, a file descriptor (fd for short) is a small positive integer used as reference to an open file in a...
In order to execute another program within ours or to execute part of our program simultaneously, it can often be very useful to create child processes. Then, all we need to do is patiently wait for them to finish their tasks, or, if we’re feeling particularly murderous, kill them prematurely! So what exactly is a process? How can we create child processes, and why wait for them or kill...
Following a meeting with 42 school’s pedagogical team, I decided to remove all articles directly related to 42 projects. The most rewarding part of every project is the whole research, testing, failing and researching again process that finally leads to a viable solution. And I wouldn’t want to deprive anyone of this journey. By digging a little deeper into this site, you will find...
We all know the Internet. It’s the network that enables data transfer on a global scale. Its magnitude is staggering: there are about 5 billion users, 200 million active websites, 300 billion emails sent daily and 40 thousand Google searches every second. We access it by different means (WiFi, optical fiber, coaxial cable…), and with various devices (computers, smartphones...
A terminal with black-on-white text or vice versa is not very interesting or attractive or informative. Thankfully, modern terminal emulators offer a variety of text styling options as well as foreground and background colors. It’s just a matter of knowing how to apply them with ANSI escape sequences or the tput command. We will explore both methods in this article. How a Terminal Formats...