Stevens's books are timeless. Yeah, they're labelled as "Unix", but they're really more about Posix to the most extent. Still very relevant today. My own copie

Stevens's books are timeless. Yeah, they're labelled as "Unix", but they're really more about Posix to the most extent. Still very relevant today. My own copies are +20 years old, but useful enough that they have the least dust on my bookshelf (and I predominantly work on Windows).