From: Paul Fulghum <paulkf@microgate.com>
To: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Strange problem with tty layer
Date: Fri, 26 Jan 2007 09:06:52 -0600 [thread overview]
Message-ID: <45BA190C.5040300@microgate.com> (raw)
In-Reply-To: <20070126145608.GK7582@csclub.uwaterloo.ca>
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.
next prev parent reply other threads:[~2007-01-26 15:06 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-24 20:40 Strange problem with tty layer Lennart Sorensen
2007-01-24 21:20 ` Paul Fulghum
2007-01-24 21:48 ` Lennart Sorensen
2007-01-25 15:16 ` Lennart Sorensen
2007-01-26 14:20 ` Lennart Sorensen
2007-01-26 14:51 ` Paul Fulghum
2007-01-26 14:56 ` Lennart Sorensen
2007-01-26 15:06 ` Paul Fulghum [this message]
2007-01-26 16:08 ` Lennart Sorensen
2007-01-29 19:27 ` Lennart Sorensen
2007-02-17 16:09 ` Lennart Sorensen
-- strict thread matches above, loose matches on Subject: below --
2007-01-24 21:19 Kilau, Scott
2007-01-24 21:34 ` Lennart Sorensen
2007-01-25 14:31 ` Russell King
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