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Subject:	Re: serial ports and SL4.4
From:	WILLIAM J LUTTER <[log in to unmask]>
Reply To:	WILLIAM J LUTTER <[log in to unmask]>
Date:	Wed, 4 Nov 2009 11:33:56 -0600
Content-Type:	text/plain
Parts/Attachments:	text/plain (51 lines)

For what it is worth,
I do have the 50-udev.permissions line as suggested by the other SL response.  I had checked this yesterday before sending email to SL group although I did not report it.
ttyS*:root:uucp:0660

ON SL4.4
powering on the serial device will switch from root:uucp 0660 to root:root 0620
sudo chown root:uucp /dev/ttyS0 works to switch owner to root:uucp
sudo chmod 0660 /dev/ttyS0 will switch group  back to root
running c code switches group back to root

I'm not a system admin, all I know, is that I can follow the web comments about adding a user to group uucp and get SL5.0 to work with my serial device and associated c code in a consistent way.  The laptop with SL4.4 doesn't  play the same way.  SL4.4 was installed from CD but not updated in any way.

Bill Lutter

----- Original Message -----
From: Steven Timm <[log in to unmask]>
Date: Tuesday, November 3, 2009 10:09 pm
Subject: Re: serial ports and SL4.4
To: WILLIAM J LUTTER <[log in to unmask]>
Cc: "[log in to unmask]" <[log in to unmask]>


> I have SLF4.7 on my laptop and I don't have the problem you mention.
> In the days when I had 4.4 it was OK too.
> 
> Steve
> 
> 
> On Tue, 3 Nov 2009, WILLIAM J LUTTER wrote:
> 
> >If I install SL4.4 on a laptop and then try to use the /dev/ttyS0 
> serial port, I find I can't control the ownership and permissions of 
> the port.  It resets from 0660 root uucp to root root and owner rw 
> permissions.  So, I can't add a user to the uucp group to manage usage 
> of the serial port (this works ok on SL5.0.    If I try to just  run 
> everything via sudo, it seems my terminal settings via stty have changed.
> >
> >I know I'm not using an up-to-date SL release, nevertheless, is this 
> a "known" issue with an obvious work around - so I don't have to reinstall?
> >
> >Bill Lutter
> >
> 
> -- 
> ------------------------------------------------------------------
> Steven C. Timm, Ph.D  (630) 840-8525
> [log in to unmask]  http://home.fnal.gov/~timm/
> Fermilab Computing Division, Scientific Computing Facilities,
> Grid Facilities Department, FermiGrid Services Group, Assistant Group 
> Leader.

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