(PDF format, secondary production version, more than 100 pages. Basic entry-level learning materials. The file directory is as follows Chapter 1 Basic Knowledge Chapter 2 Process Introduction Chapter 3 File Operation Chapter 4 Time Concept Chapter 5 Signal Management Chapter 6 Message Management Chapter 7 Thread Operation Chapter 8 Network Programming Chapter 9 C Development Tools under Linux
Introduction to C Language Programming under Linux Operating System.pdf)