From: Kyle Schmitt <kyleaschmitt@...>
Date: 2009-02-18T11:20:24+09:00
Subject: Re: a little daemon daemonizes, but hangs the logout

On Tue, Feb 17, 2009 at 5:38 PM, Joel VanderWerf
<vjoel@path.berkeley.edu> wrote:
>> I needed a little daemon thisafternoon, so I wrote one in ruby using
>> fork and Process.detach.  It's working ok I suppose, except that when
>
> IIUC, Process.detach is not what you need to start a daemon. All it does  is
> start a ruby thread to reap the pid when the child exits, so you don't end
> up with zombies. If the parent process exits first, this thread is gone
> anyway.
>
> Search the list for daemonize... for a classic daemon, you need to double
> fork, Process.setsid, chdir, disconnect from stdin/out, and probably
> something else I'm forgetting.
>
> --
>      vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407


Ahh ok.  It's been so long since I've written a classic daemon in C,
that when I saw a post using Process.detach I thought, wow, ruby
really _does_ make everything so easy ;)

I'll go read, and go the classic route.  Daemonize is probably a fine
nice library, but being for work, issues sometimes arise about which
extra packages are put on a server.  Gobs of home-grown code are fine,
third party apps and libs are _sometimes_ frowned upon.  Just one of
those things.

Thanks
--Kyle