This chapter describes System V message queues. Message queues allow processes to exchange data in the form of messages. Message queues are somewhat like pipes, but differ in two important respects. First, message boundaries are preserved, so that readers and writers communicate in units of messages, rather than via an undelimited byte stream. Second, each message includes an integer type field, and it is possible to select messages by type, rather than reading them in the order in which they were written.
46 System V Message Queues
46.1 Creating or Opening a Message Queue: msgget()
46.2 Exchanging Messages
46.2.1 Sending Messages: msgsnd()
46.2.2 Receiving Messages: msgrcv()
46.3 Message Queue Control Operations: msgctl()
46.4 Message Queue Associated Data Structure
46.5 Message Queue Limits
46.6 Displaying All Message Queues on the System
46.7 Client-server Programming with Message Queues
46.8 A File-server Application Using Message Queues
46.9 Disadvantages of System V Message Queues
46.10 Summary
46.11 Exercises
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