Date: 08 Oct 2001 11:17:15 +0200 From: Dmitry Karasik <dmitry@karasik.eu.org> To: Bruce Evans <bde@zeta.org.au> Cc: <freebsd-current@FreeBSD.ORG> Subject: Re: /dev/cuaa broken ? Message-ID: <uzo72h4o4.fsf@karasik.eu.org> In-Reply-To: Bruce Evans's message of "Mon, 8 Oct 2001 18:06:33 %2B1000 (EST)" References: <20011008163346.C14481-100000@delplex.bde.org>
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Hi Bruce!
On 08 Oct 01 at 18:06, "Bruce" (Bruce Evans) wrote:
Thanks Bruce
Further investigation revealed the following fact, which
might be relevant. If a write of 1 byte is issued, everything
is O.K - contrary to when more than 1 byte is written, there
is a problem. It was noticed first with cu, when I typed
a command from keyboard and copy-pasted it after and received
different results.
As for now, we have fixed our code in such a fashion
that now it writes commands by 1 byte - but since the
exact problem cause is unknown, be it dtr state or
something else, it might be still a hack, that wouldn't work
in different circumstances, on a faster machine for example.
If that bug makes a particular interest to you, I can make
an account for you on that box.
Bruce> I haven't found the bug yet. It was first fixed relatively
Bruce> recently in rev.1.152 (1996/11/30) of sio.c. Until then, you had
Bruce> to have waits in your program or dtrwait large enough to avoid loss
Bruce> of data on close. But dtrwait didn't help for the ioctls that need
Bruce> to wait for output to drain.
Bruce> Bruce
--
Sincerely,
Dmitry
--- www.karasik.eu.org ---
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