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.

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