From owner-freebsd-hackers@FreeBSD.ORG  Sat Apr 22 11:44:22 2006
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Date: Sat, 22 Apr 2006 21:44:18 +1000
From: Peter Jeremy <peterjeremy@optushome.com.au>
To: Garrett Cooper <youshi10@u.washington.edu>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: Is showing all attributes for RS232 port possible in FreeBSD?
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On Sat, 2006-Apr-22 04:28:30 -0700, Garrett Cooper wrote:
>	I was just wondering if there was any way where I could program with 
>C, such that I could view information regarding the extra pins on a  
>DB9 serial port other than just TXD and RXD, ie the DTS, CD, CTS,...  
>etc ports.

Look in tty(4), specifically TIOCMSET, TIOCMGET, TIOCMBIS, TIOCMBIC.

-- 
Peter Jeremy