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Message-ID: <jer6ktt490.fsf@sykes.suse.de>
Date: Thu, 20 Sep 2007 23:29:31 +0200
From: Andreas Schwab <schwab@...e.de>
To: Matthew Wilcox <matthew@....cx>
Cc: linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
linux-serial@...r.kernel.org
Subject: Re: Don't cross the (tty) streams
Matthew Wilcox <matthew@....cx> writes:
> Connect two machines with a serial cable. On the victim:
>
> willy@...lf:~$ cat </dev/ttyS1
>
> Now, let's find out which ttyS on the other machine is connected ...
>
> willy@...th:~$ echo foo >/dev/ttyS1
> -bash: echo: write error: Input/output error
>
> Oops, that's not a serial port. No output on rowlf, as expected.
> OK, carrying on ...
>
> willy@...th:~$ echo bar >/dev/ttyS0
>
> And yet on rowlf, we now see:
>
> foo
> bar
>
> Looks like there's an error path that doesn't throw away data on -EIO.
Read the thread starting here:
<http://lists.gnu.org/archive/html/bug-bash/2007-09/msg00020.html>.
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@...e.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
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