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From: cyg Simple <cygsimple AT gmail DOT com>
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Date: Tue, 1 Jan 2019 11:01:58 -0500
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On 1/1/2019 2:18 AM, Gary Graham wrote:
> I downloaded an updated version of the Cygwin tools and tried again....
> 
> C:\cygwin64\bin>socat -d -d pty,link=/dev/ttyV0,waitslave tcp:
> 192.168.0.11:8023
> 2019/01/01 01:14:27 socat[10780] N PTY is /dev/pty0
> 2019/01/01 01:14:27 socat[10780] N opening connection to AF=2
> 192.168.0.11:8023
> 2019/01/01 01:14:28 socat[10780] N successfully connected from local
> address AF=2 192.168.0.18:55426
> 2019/01/01 01:14:28 socat[10780] N starting data transfer loop with FDs
> [5,5] and [6,6]
> 2019/01/01 01:14:28 socat[10780] N read(5, 0x600056500, 8192): Input/output
> error (probably PTY closed)
> 2019/01/01 01:14:28 socat[10780] N socket 1 (fd 5) is at EOF
> 2019/01/01 01:14:28 socat[10780] N socket 1 (fd 5) is at EOF
> 2019/01/01 01:14:28 socat[10780] N socket 2 (fd 6) is at EOF
> 2019/01/01 01:14:28 socat[10780] N exiting with status 0
> 
> Can you tell why the PTY is closing ?

Both ends of the processes a Cygwin process?  PTY is only available to 
Cygwin.

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