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Message-ID:	<389D9A79.91C096E2@handshake.de>
Date:	Sun, 06 Feb 2000 14:59:53 +0000
From:	Daniel Kroening <kroening AT handshake DOT de>
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To:	cygwin AT sourceware DOT cygnus DOT com
Subject:	DCD on serial ports, was: ioctl() function

Hello,

I know it´s an old mail, but I have the very same problem. I need a
function call which allows to detect if DCD on a serial port is active.
Linux offers the TIOCMGET and TIOCM_CAR extention to ioctl(). Anyone
with a solution?

> I was trying to port some unix code and it uses ioctl() for serial comms.
> sys/ioctl.h was either missing or blank - I can't remember.
> I added some #defs from linux.
> and now the code appears to read and write to/from the port.
> The code I have checks if DCD is active to see if a call is being made to a
> modem.
> But this is where things don't work. 
> 
> ioctl(portfd, TIOCMGET, &stat) returns -1
> so it never detects carrier. where can I get correct values for ioctl.h or
> should I be using a different call under NT??
> (NT4, sp3, 64MB)

Daniel Kröning

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