Anyone who writes assembly from time to time is aware of how cryptic the manpages for syscalls can be, especially when using more complicated syscalls that require certain data structs to be passed as arguments (even the internet seems to have no PoC's for some of these >:| ).
I was hoping this book would serve as a handy reference for me to turn to when the manpages weren't cutting it, but it has far surpassed that expectation. This is THE most detailed programming book that I own. I consider this my personal Bible for low-level Linux programming.
My only half-complaint about this book is that it is extremely knowledge-dense, making it time-consuming to read. I found myself re-reading pages frequently in order to fully absorb all the information the author throws at you... but thats the only half-bad thing I can say about it.
I would highly recommend this to anyone who frequently writes low-level Linux applications whether it be Assembly/C/Rust.