[OpenIndiana-discuss] stty source code

[Roel_D]

"never" use USB-> Serial when you're testing something. There is a huge
difference between products, and the bad products behave very unpredictable.

Don't forget that the voltage of USB is 5V MAXIMUM but can be much lower
depending on the hardware, legacy serialports need a good 5V for a logical
1. 
So communication can be disrupted by voltagedrops because the logical 1's
are not transmitted at the right voltage. 




-----Original Message-----
From: Reginald Beardsley [mailto:pulaskite at yahoo.com] 
Sent: donderdag 6 september 2012 17:14
To: Discussion list for OpenIndiana
Subject: Re: [OpenIndiana-discuss] stty source code

Sorry, I missed that detail.  I just opened the connection w/ tip, went to
the window where I was setuid to uucp and did "stty olcuc </dev/cua/0" then
back to the tip window. No effect.  Everything is still lower case.

At this point, I think I need to make a non-setuid copy of tip and run tip
under truss from a shell which is setuid to uucp.  I'll have to wait until
tomorrow to try that though as other things will take up the rest of the
day.

I'm beginning to suspect that there's something in the USB serial driver
which is being more "helpful" than it should.  So another thing is to spin
up OI on a box w/ a real serial port and see how it behaves.

--- On Thu, 9/6/12, Andrew Gabriel <illumos at cucumber.demon.co.uk> wrote:

> From: Andrew Gabriel <illumos at cucumber.demon.co.uk>
> Subject: Re: [OpenIndiana-discuss] stty source code
> To: "Discussion list for OpenIndiana" 
> <openindiana-discuss at openindiana.org>
> Date: Thursday, September 6, 2012, 9:34 AM The stty changes will be 
> lost when the last stream closes and the port settings are reset, 
> which is probably the very instant that the stty command which makes 
> the changes exits in your example. So this will only work if something 
> else is holding the port open. That's why I said try it when tip is 
> running.
> 
> Alternatively, just to check you can change the parameter, use some 
> other command in another window to keep it open, such as sleep 10000 < 
> /dev/cua/0
> 
> Reginald Beardsley wrote:
> > Andrew,
> > 
> > There are no serial ports and hence no /dev/term/b on
> this system.  In fact if the USB<->RS-232 adapter is not plugged in, 
> there is no /dev/term or /dev/cua either.
> Which may explain some of the weirdness when I was setting up the port 
> as I don't think I had plugged in the Keyspan adapter when I started 
> configuring it. /dev/{term,cua}/0 don't get created until you plug in 
> the adapter and disappear when you unplug it.
> > 
> > ttymon holds /dev/term/0, so even root or uucp cannot
> open /dev/term/0.  stty just hangs until interrupted.  Everything I've 
> read suggests that it is not possible to have a port be outbound only 
> and that is must be bidirectional.  However, I've not attempted to 
> test that. I've got enough annoyance as it is.
> However, I  can see lots of opportunity for trouble w/ ttymon running 
> on a port that goes away when the USB-serial adapter is unplugged.
> > 
> > I can open /dev/cua/0 w/ stty, but do not seem to be
> able to make any changes.
> >   
> 
> -- Andrew
> 
> 
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> 

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