I highly recommend this book: https://www.amazon.com/Linux-Programming-Interface-System-Handbook/dp/1593272200 https://www.amazon.com/Linux-Programming-Interfac

I highly recommend this book: https://www.amazon.com/Linux-Programming-Interface-System-Handbook/dp/1593272200 https://www.amazon.com/Linux-Programming-Interface-System-Ha... All system call interfaces, as well as how system calls happen are thoroughly documented there. Though, I would just use libc, since all this stuff is a bit messy and have plenty of legacy stuff.