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From: "BB" <canofspam AT att DOT net>
Subject: Re: agetty problem - inconsistent echo
Date: Fri, 14 Mar 2003 18:08:47 -0600
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References: <b4tml1$t6q$1 AT main DOT gmane DOT org> <5 DOT 2 DOT 0 DOT 9 DOT 2 DOT 20030314150750 DOT 02e033b0 AT pop3 DOT cris DOT com>
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Running stty -a dialed in from Hyperterminal I get the results below.  min
is set to 1. The only differences from what you sent in your reply are
echoe, echoctl, and echoke without '-'.

Does it matter what the TERM environment variable is set to?  I have
configured agetty to set it to vt100 and to nothing (defualt to cygwin).  I
get the same results.

The problem is not just with the end of line \r.  As I type characters,
every second character causes the echo of the two characters.  If the end of
line happens to be the second of a pair, the command works.

$ stty -a
speed 38400 baud; rows 24; columns 80; line = 0;
intr = ^C; quit = ^\; erase = ^H; kill = ^U; eof = ^D; eol = <undef>;
eol2 = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W;
lnext = ^V; flush = ^O; min = 1; time = 0;
-parenb -parodd cs8 -hupcl -cstopb cread -clocal -crtscts
-ignbrk brkint -ignpar -parmrk -inpck istrip -inlcr -igncr icrnl ixon -ixoff
-iuclc ixany imaxbel
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0
ff0
isig icanon iexten echo echoe -echok -echonl -noflsh -tostop echoctl echoke

"Randall R Schulz" <rrschulz AT cris DOT com> wrote in message
news:5 DOT 2 DOT 0 DOT 9 DOT 2 DOT 20030314150750 DOT 02e033b0 AT pop3 DOT cris DOT com...
> BB,
>
> Well, it's a long shot, but System V Unix-style tty drivers, including
> the Cygwin emulation on Windows, have a parameter, "min," that tells
> the minimum number of characters that must be present in the input
> buffer before it will be activated. Programs that use the readline
> library (BASH, e.g.) or that operate in a character-by-character mode
> (Vim or Emacs, e.g.) will typically have this set to 1:
>
> (running BASH)
> % stty -a
> ...
> ... min = 1; time = 0;
> -parenb -parodd cs8 -hupcl -cstopb cread -clocal -crtscts
> ...
> isig icanon iexten
echo -echoe -echok -echonl -noflsh -tostop -echoctl -echoke
>
>
> Your symptoms are consistent with "stty min 2", though I can think of
> no reason this would occur (a bug in agetty?), but you can confirm it
> by running "stty -a" and looking at what min setting it reports.
>
> Randall Schulz
>
>
>
> At 14:56 2003-03-14, BB wrote:
> >I am using agetty with both Win95 and WinXP.  On WinXP everything works
> >fine. On Win95, I have a problem.
> >
> >When the Win95 machines modem answers the call, agetty correctly prompts
for
> >the login: id.  I type it in and notice that every character I type is
> >immediately echoed back to me (I'm using hyperterminal).  This is as I
would
> >expect based on the agetty code.  Each character is read and written back
to
> >the tty.
> >
> >Once I enter the login id, agetty spawns login.exe.  From this point on,
the
> >characters I type are echoed back to me on every second character.  The
> >problem is that if I type a command with an odd number of characters such
as
> >"ls\r", nothing happens.  Once I type one more '\r' or even a space, the
> >command is executed.  The extra character I typed is also echoed back,
> >usually after the next shell prompt.
> >
> >What could be causing my input to be processed two characters at a time.
> >This does not occur on an XP machine running agetty.
> >
> >Thanks
>
>




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