5. Interprocess Communication
CHAPTER 3, “PROCESSES,” DISCUSSED THE CREATION OF PROCESSES and showed how one process can obtain the exit status of a child process. That’s the simplest form of communication between two processes, but it’s by no means the most powerful. The mechanisms of Chapter 3 don’t provide any way for the parent to communicate with the child except via command-line arguments and environment variables, nor any way for the child to communicate with the parent except via the child’s exit status. None of these mechanisms provides any means for communicating with the child process while it is actually running, nor do these ...
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