March 2017
Intermediate to advanced
732 pages
15h 24m
English
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What is a device driver?
A device driver is a special code that interfaces a physical device into the system and exports it to the user-space processes using a well-defined API. In a UNIX-like OS, where everything is a file, the physical device is represented as a file. Then, the device driver implements all the system calls a process can do on a file.
Tip
The difference between a normal C function and a system call is just the fact that the latter is mainly executed into the kernel while a function executes into the user space only. For example, printf() is a function while write() is a system call. The latter (except for the prologue and epilogue part of a C function) executes into the kernel space, while the former executes into the user space ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.