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Object Classes

Table: Object classes for the Linux System V IPC component.
semaphore set
message queue
shared memory

The set of object classes for the System V IPC component is shown in Table 38. A class is defined for each System V IPC abstraction. Additionally, a class is defined for individual messages within a message queue, so that messages can be individually labeled and controlled. By default, the SID of a System V IPC object will be set to the SID of the creating process. For System V message queues, an additional SID attribute will be bound to each message. That SID is set by default to the SID of the message sending process.