stty, SCO, clear EOL

[Joe Chasan]

On Fri, Jul 15, 2016 at 01:14:21PM -0400, Brian K. White via Filepro-list wrote:
> On 7/15/2016 10:43 AM, Joe Chasan via Filepro-list wrote:
> >On Fri, Jul 15, 2016 at 09:02:34AM -0500, Bob Rasmussen via Filepro-list wrote:
> >>I'm dusting off old memories here, in response to a customer, and I
> >>need some help. Customer connects from Anzio on Windows to SCO 6,
> >>runs filePro (not sure of version). Says if he connects via telnet,
> >>all is good, but if he connects via SSH, when he types ctrl-O, it
> >>doesn't clear to end of line. Emulation type is SCOANSI.
> >>
> >>The difference boils down to the stty setting "iexten". It's off in
> >>telnet (not sure what initializes this); ON in SSH (set by Anzio).
> >>In both cases, flush = ^o.
> >>
> >>Here's my analysis:
> >>
> >>* When iexten is on, UNIX gets the ctrl-O and deals with it somehow;
> >>
> >>* When iexten is off, UNIX passes the ctrl-O to filePro, which deals
> >>with it as directed by the termcap entry;
> >>
> >>* When filePro sets the tty mode (in C) to "raw", it must not be
> >>turning off the iexten switch;
> >>
> >>* This may not be an issue in Linux.
> >>
> >>Does this all make sense? Is my analysis correct?
> >
> >I have noticed it as well.  Not an issue in Linux or in OSR5 even.  Not an
> >anzio issue either as other ssh clients do the same thing.  Tried
> >digging into it on SCO side, the only mention I see of iexten is in
> >maintenance pack 3 & 4 notes, and perhaps it makes more sense to you:
> >| 308. SVR5 OSR5 ABI differences in termios ioctl c_lflag bit meaning. --
> >| When running various OpenServer 5 binaries which used termio/termios
> >| related ioctl's, certain operations were not working correctly.
> >| Among these issues were the setting of the termio/termios c_lflag
> >| TOSTOP, ECHOCTL, and IEXTEN flags, and the termios c_cc elements
> >| VSTART, VSTOP, VDSUSP, and VREPRINT. The mentioned items have been
> >| corrected, so the proper settings are done when running the
> >| OpenServer 5 binary. (ID: 534510:1)
> >
> >A hack of a fix would be to "stty flush ''" or "stty -iexten" in
> >/etc/profile, optionaly if $SSH_TTY is set, which I've done on occasion
> >when annoyed.
> 
> Excellent help. Sounds like the first thing to do is ask the
> customer if they are updated to at least mp4 and to install the
> current maintenance pack whatever that is.

To clarify, that change began in 5.07MP3 and continued in MP4 - I don't
think anything's been "fixed" since, not that they consider their initial
fix a bug anyway.  For all intents and purposes, if on SCO still, one should
be on the latest maintenance pack anyway, complete with the few patches
since (see patchck), but you are pretty much stuck with what is out there
now for that platform.  One cannot expect much from SCO/Xinuous at this point 
on an older platform such as this, even if they had the resources still.

Hence, my "hack".
 
On a related note - I hope people realize that fp-tech also considers SCO
Openserver 5.07 a "dead" platform and have no intentions of bringing any 
fp version past fp 5.7 to it.  The current 5.8 will not run on it. 

-joe