From owner-freebsd-current@FreeBSD.ORG  Tue Sep 21 05:58:46 2004
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To: "Alexandre \"Sunny\" Kovalenko" <Alex.Kovalenko@verizon.net>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Mon, 20 Sep 2004 22:57:35 EDT."
             <1095735454.2535.21.camel@RabbitsDen> 
Date: Tue, 21 Sep 2004 07:58:45 +0200
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cc: freebsd-current@freebsd.org
Subject: Re: TTY cleanups have started... 
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In message <1095735454.2535.21.camel@RabbitsDen>, "Alexandre \"Sunny\" Kovalenk
o" writes:

>I do not own the breaker box so I can not tell you what modem signal
>states are, even though with 9 pin USB-to-serial dongle I would suspect
>we would be lucky if RTS and CTS actually change, most likely there are
>two data wires and software flow control, however, the right answer is:
>I don't know.

I bet you the problem is the DCD, since the most recent commit makes
ucom0 act like a real tty devices (rather than a cua device).

Can you try adding "O_NDELAY" to the open flags ?

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.