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A gentle introduction to the world of UNIX IPC. Covers fork, signals, pipes, FIFOs, file locking, POSIX message queues, semaphores, shared memory segments, memory mapped files, UNIX sockets. Not a ton of depth, but that’s okay – you can read all of it in about 15 minutes and have a good feel for the pros and cons of all the different types of IPC.

Check out Beej’s Guide to Network Programming and Beej’s Quick Guide to GDB too.