OS &
NETWORKING

Bibliography and references:

1.  The design of the Unix Operating System 

https://archive.org/details/DesignUNIXOperatingSystem

2.   C Programming Manual, Dennis M Ritchie & Brian W Kernighan  

https://www.cs.emory.edu/~cheung/Courses/255/Syllabus/1-C-intro/Docs/C-book.pdf