January 2004
Intermediate to advanced
432 pages
11h 1m
English
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I/O Odds and Ends
There are a few I/O topics that don't really fit into the categories we've talked about so far, but they are worth knowing about.
Device Files and the Device Switch Table
Device files in HP-UX are represented by two numbers: a major number and a minor number. Within the kernel, these two numbers are concatenated to form a single 32-bit value known as a dev_t. The first 8 bits of the dev_t are the major number, and the remaining 24 bits are the minor number. The major number is associated with a driver through the device switch tables, which we talked about earlier. The minor number is passed as an argument to that device driver's routines.
As an example, let's say we want to do an open() system call to a tape device called ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.