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Re: Redirect stdin & stdout to serial port
- From: Igor Peshansky <pechtcha at cs dot nyu dot edu>
- To: "D.Pageau" <dpageau at infodev dot ca>
- Cc: cygwin at cygwin dot com
- Date: Mon, 20 Mar 2006 20:02:26 -0500 (EST)
- Subject: Re: Redirect stdin & stdout to serial port
- References: <441F2482.2040502@infodev.ca>
- Reply-to: cygwin at cygwin dot com
On Mon, 20 Mar 2006, D.Pageau wrote:
> I have to redirect both stdin & stdout to com1
>
> lrz -X -vv foo.bin > /dev/ttyS0 < /dev/ttyS0
> bash: /dev/ttyS0: Permission denied
>
> This is working on *nix but not with Cygwin. Why ?
According to the strace, bash opens the port twice, using O_CREAT|O_TRUNC
when redirecting output, and Windows apparently doesn't allow opening a
serial port for writing in that mode after opening it for reading (and
vice versa).
> any work around ?
Well, bash does offer an input/output redirection with the '<>'
operator... Did you try that?
Also, duplicating the file descriptor might work (e.g., </dev/ttyS0 >&0).
> CYGWIN_NT-5.0 foo 1.5.20(0.155/4/2) 2006-03-19 16:11 i686 Cygwin
HTH,
Igor
--
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