linux-kernel - Re: Strange problem with tty layer

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Message-ID: <45BA190C.5040300@microgate.com>
Date:	Fri, 26 Jan 2007 09:06:52 -0600
From:	Paul Fulghum <paulkf@...rogate.com>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Strange problem with tty layer

Lennart Sorensen wrote:
> I am not sure actually.  I just open /dev/ttyn0 and /dev/ttyn1 and write
> to one, and read from the other.  I didn't even know about the line
> diciplines actually.  How do I tell which one I am using?

ioctl(TIOCSETD/TIOCGETD) sets/returns an integer identifier
that can be compared agains the N_XXX macros. If you are
not explicitly setting this then is is probably the default N_TTY.

Also at the application level, look at tcsetattr() for setting
the termios features. Look specifically at the c_cc[VTIME] and c_cc[VMIN]
members of the termios structure. These settings control how
much data must be available before returning data to a read().
Try VTIME=0 and VMIN=1.

Since your 'missing' data is always on the tail end, maybe
VMIN is set to 64 or something.

-- 
Paul Fulghum
Microgate Systems, Ltd.
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