I first met the C language 20 years ago. I have been working with C language for 12 years. I have read several C programming books, but their purpose is to teach how to start programming in C. There is no book about program in C practically for a real product. Fortunately, I have learned good C programming skill when working for companies that have good C programmers and good development process. I have also seen how great C programmers develop large scale software, from the Linux kernel sources.

This document is some part of what I have learned and seen.

For students, this document takes one or two weeks. Please focus on how the C basics, such as function pointer, pointer, macro and etc, are used in the real product. If you are already a professional C programmer, you could compare the source of this document and your product. I would be happy if you find something that can be applied to your product.

Please let me know if you have any tips for practical C programming skills. Please register your tips in the ticket of this repository. I will write a document for it and add here with your name.

I am not a native English speaker. Please inform me if you find any broken English.

• First version in Korean: Feb. 12 2019
• Start translation: Feb. 23 2019
• Finish translation: Mar. 12 2019

• Error handling with goto
• Make if-else short with branch table
• Make for-loop with macro
• Implement framework and plugin
  • Object programming in C: make cstring class with C
  • Introduction
  • Implement unittest framework
  • Implement unittest for cstring
  • Make test case with macro
• Sample project: serial number generator
  • Initial version
  • Implementation the framework and plugin for the serial number generator

• pdu allocation
• atomic counter => per_cpu counter
• test_and_set_bit_lock
• function pointers -> virtual abstract layer (kernel: virtual filesystem interface)