informIT: The Process Model of Linux Application Development

“One of Unix’s hallmarks is its process model. It is the key to
understanding access rights, the relationships among open files,
signals, job control, and most other low-level topics in this book.
Linux adopted most of Unix’s process model and added new ideas of
its own to allow a truly lightweight threads implementation.

“What exactly is a process? In the original Unix
implementations, a process was any executing program…”

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