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From:	"Siegfried Heintze" <siegfried AT heintze DOT com>
To:	<cygwin AT cygwin DOT com>
Subject:	How to write telnet server like program for serial port?
Date:	Fri, 1 Oct 2004 16:41:09 -0600
MIME-Version:	1.0
In-Reply-To:	<Pine.GSO.4.61.0410011652590.3513@slinky.cs.nyu.edu>
Message-Id:	<200410011640796.SM01220@fasolt>
X-IsSubscribed:	yes

I need to write a program similar to a telnet server. A telnet server
asynchronously reads data from a socket and writes it to a
sub-process, and asynchronously reads data from the subprocess and
writes to a socket. My program needs to replace the subprocess with a
serial port.

The telnet server cannot anticipate when data will arrive from the
socket. Neither can it anticipate when data will arrive from the
subprocess. 

How can I write a similar OS vendor neutral program using Cygwin C++,
except, instead reading and writing to a process, I read and write to
serial port? Can I do this with a single thread? How do I read and
write to a serial port? Can anyone point me to some sample code for
serial port I/O? I suppose I can look at the source for telnet -- it
probably uses the select function.

  Thanks,
     Siegfried


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