Book Image

Practical C Programming

By : B. M. Harwani
Book Image

Practical C Programming

By: B. M. Harwani

Overview of this book

Used in everything from microcontrollers to operating systems, C is a popular programming language among developers because of its flexibility and versatility. This book helps you get hands-on with various tasks, covering the fundamental as well as complex C programming concepts that are essential for making real-life applications. You’ll start with recipes for arrays, strings, user-defined functions, and pre-processing directives. Once you’re familiar with the basic features, you’ll gradually move on to learning pointers, file handling, concurrency, networking, and inter-process communication (IPC). The book then illustrates how to carry out searching and arrange data using different sorting techniques, before demonstrating the implementation of data structures such as stacks and queues. Later, you’ll learn interesting programming features such as using graphics for drawing and animation, and the application of general-purpose utilities. Finally, the book will take you through advanced concepts such as low-level programming, embedded software, IoT, and security in coding, as well as techniques for improving code performance. By the end of this book, you'll have a clear understanding of C programming, and have the skills you need to develop robust apps.
Table of Contents (20 chapters)

Passing a message from one process to another using the message queue

In this recipe, we will learn how communication between two processes is established using the message queue. This recipe is divided into the following parts:

  • Writing a message into the message queue
  • Reading a message from the message queue

Before we begin with these recipes, let's quickly review the functions, structures, and terms that are used in successful interprocess communication using shared memory and message queues.

Functions used in IPC using shared memory and message queues

The most commonly used functions and terms for IPC using shared memory and message queues are ftok, shmget, shmat, shmdt, shmctl, msgget, msgrcv, and msgsnd.