Recording the C / C ++ daemon (Linux)

Question

I want to write a common (C / C ++) library that I will use to create daemons in a Linux environment. Instead of reinventing the wheel, I thought I would come here to find out if there are any known libraries in use.

The library can be either C or C ++ - although I would prefer C ++ (perhaps something that was part of, or based on an excellent BOOST library?).

Alternatively, in terms of library selection criteria, since daemons are rather “critical” components, it would be much better if the library you are offering is actively supported by a development team (for example, the BOOST library [again]), has an active community (or at least a mailing list resorted to in difficult situations), and not a lonely person somewhere out there ...

I saw this document , which is a good starting point, but it is slightly outdated, so I wonder if there is anything better and more well known / used there ...?

By the way, I will develop on Ubuntu (10.0.4)

Answer 1

An alternative solution is to use a process monitor, such as supervisord , which manages several services, restarts them when they fail, provides a minimalistic web page for viewing and monitoring the status of processes, managing service groups, supporting a mechanism for forwarding general-purpose change events and other positive effects. Such tools give you much more value than the demon library.

Answer 2

#include <unistd.h> 

It has

 int daemon(int nochdir, int noclose); 

Which forks, exits from the control terminal, open all {stdin, stdout, stderr} in / dev / null again and change the working directory to the root directory. (based on flags of course)

Answer 3

If your daemon uses tcp / ip sockets, you can use inet daemon (or xinetd). However, your process starts as a new incoming connection arrives. However, scalability issues may arise in the event of a large-scale deployment.