Re: [tlug] HELP cannot connect to the sound daemon

["Martin Arballo" <martinarballo@example.com>]

thank you josh,
I will study carefully all details you gave me to understand a little more 
about start up.


From: Josh Glover <jmglov@example.com>
Reply-To: tlug@example.com
To: tlug@example.com
Subject: Re: [tlug] HELP cannot connect to the sound daemon
Date: Thu, 27 Jun 2002 10:13:17 -0400

Martin Arballo wrote:
>Mauro and Matt,
>
>Now I know how can I make my sound card work, but,
>what happen if I do both things......or do they have exactly same result 
>and efficiency?  in that case, I would like to understand why?

OK, here is the answer in a nutshell:

When your system starts up, it goes through the mysterious SysV init 
scripts. (SysV == System V, the Other Unix, AT&T's official one, as opposed 
to the rebel BSD from Berkley.) I Googled for a link that explains how this 
works (thus saving me the typing), but I could not find anything, so here 
goes (correct me if I misspeak, anyone!).

Your system has a default runlevel (usually 5 on Linux systems in multiuser 
mode). It executes the scripts in the /etc/rc.d/rcX.d/ (where X is the 
numerical runlevel--run 'runlevel' with no arguments to see which runlevel 
your system is currently in, 'man runlevel' for more interesting stuff) 
directory, in alphabetical order. To facilitate the starting of scripts in 
the correct order, they are named using the convention ('K'|'S')XXservice 
(where XX is a number between 00 and 100, exclusive and service is the name 
of a service). Filenames starting with 'K' (Kill) stop a service, filenames 
starting with 'S' (Start) start a service. Therefore, on startup, the system 
executes the S* scripts, in order, from the aforementioned rc directory. 
When it is done with this, it executes /etc/rc.d/rc.local script. So, 
anything there gets executed last in your startup procedure.

Similarly, on shutdown, the system executes all the K* scripts in that rc 
directory.

Do an ls -l on /etc/rc.d/rc5.d, however, and you will see that everything is 
just a symlink (symbolic link, 'man ln') to scripts in the 
/etc/[rc.d/]init.d/ directory.

This is an oversimplified explanation. 'man 8 init' for the full details.

chkconfig is a Redhat tool to manage all those symlinks. That way, you do 
not have to create, name and delete a bunch of links to change your startup 
configuration.


--
Josh Glover <jmglov@example.com>

Associate Systems Administrator
INCOGEN, Inc.




Martin Arballo
Industrial Designer
http://www.coroflot.com/martinarballo
Address: 1-2-2-504 Midori-cho, Inage-ku,
Chiba-shi 263-0023 Japan
Tel: +81-70-5010-8161


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