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Date: Fri, 14 Mar 2003 15:14:58 -0800
To: cygwin AT cygwin DOT com
From: Randall R Schulz <rrschulz AT cris DOT com>
Subject: Re: agetty problem - inconsistent echo
In-Reply-To: <b4tml1$t6q$1@main.gmane.org>
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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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