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System calls and libraries

System calls and libraries

This section introduces the system calls and other system services you can use to develop application programs. Each application performs a different function, but goes through the same basic steps: input, processing, and output. For the input and output steps, most applications interact with an end user at a terminal. During the processing step, sometimes an application needs access to special services provided by the operating system (for example, to interact with the file system, control processes, manage memory, and more). Some of these services are provided through system calls and some through libraries of functions.
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