51.3. Summary

POSIX IPC is the general name given to three IPC mechanisms—message queues, semaphores, and shared memory—that were devised by POSIX.1b as alternatives to the analogous System V IPC mechanisms.

The POSIX IPC interface is more consistent with the traditional UNIX file model. IPC objects are identified by names, and managed using open, close, and unlink calls that operate in a manner similar to the analogous file-related system calls.