June 2017
Beginner
502 pages
11h 26m
English
Content preview from Mastering Bash
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Becoming a daemon
A life as a daemon is not an easy life and requires a lot of gruesome deaths of parent processes.
The first thing needed for a process to become a daemon is to fork as a new process so the parent can exit, and the the prompt is returned to the invoking shell. This ensures that the new process is not a process group leader, since a process group leader cannot create a new session calling setsid. So, the new child process can now be promoted to process group leader and session leader by calling setsid. So far, the new session has no controlling terminal, and so does the new child. So, we fork again to be sure that the session and group leader can exit. Now, the grandchild is not a session, so the terminal it is going to open ...
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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.