[no subject]

Assuming you're using a somewhat recent distribution and 2.6 kernel,
it's udev that's the culprit here.  Udev uses a series of rules files to
control how the device nodes are created.  The default rules are in
/etc/udev/rules.d/50-udev.rules, but you should not edit this file
directly, since an update to udev would wipe out your changes.  Instead,
create a new rules file in /etc/udev/rules.d named 10-local.rules and
customize that one.

> Q1: How can I define these permissions so they receive my new settings
> on reboot, instead of the system defaults?

To fix the perms on the ttyS* device, for example, look for the rule in
50-udev.rules, copy it to 10-local.rules, and modify the permissions.

For example, the ttyS line in my 50-udev.rules looks like this:

# tty devices
KERNEL=="ttyS[0-9]*",   NAME="tts/%n", SYMLINK+="%k", GROUP="tty"

So, if I wanted ttyS* to have permissions 0666, I would add the
following line to my 10-local.rules file:

KERNEL=="ttyS[0-9]*",   NAME="tts/%n", SYMLINK+="%k", GROUP="tty",
MODE="0666"

Note that that should be one line.

> Q2: How can I add new devices to those created on reboot? I could add
> 'mknod' lines to rc.local, or similar, but is there a less "clunky" way
> to do it?

Just add a rule for them :)

Here is a good primer for udev rules:

<a  rel="nofollow" href="http://www.reactivated.net/writing_udev_rules.html";>http://www.reactivated.net/writing_udev_rules.html</a>

HTH,
Jason
-- 
Jason Day                                       jasonday at
<a  rel="nofollow" href="http://jasonday.home.att.net";>http://jasonday.home.att.net</a>                    worldnet dot att dot net
 
&quot;Of course I'm paranoid, everyone is trying to kill me.&quot;
    -- Weyoun-6, Star Trek: Deep Space 9


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