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Date:      Fri, 16 Feb 1996 03:02:40 -0800 (PST)
From:      Donald Burr <d_burr@ix.netcom.com>
To:        Nate Williams <nate@sri.MT.net>
Cc:        Terry Lambert <terry@lambert.org>, Jerry Kendall <jerry@border.com>, questions@FreeBSD.org
Subject:   Re: Telling if User PPP is up or down
Message-ID:  <Pine.BSF.3.91.960216024725.426B-200000@starfleet.gov>
In-Reply-To: <199602152251.PAA01813@rocky.sri.MT.net>
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[-- Attachment #1 --]
On Thu, 15 Feb 1996, Nate Williams wrote:

> The line may be taken, but the link may not be 'up' if there is no
> demand for it.

OK, try this one.  The syntax is "portstat <port>" (e.g. "portstat 
cuaa0")  Just "portstat" alone will use the first port in use (the first 
lockfile in /var/spool/lock)

Donald Burr [d_burr@ix.netcom.com], PO Box 91212, Santa Barbara CA 93190-1212
TEL (805)564-1871 / FAX 564-2315 / WWW http://www.geopages.com/WallStreet/2072
PGP Public Key available by request (send e-mail) or on Public Key Servers.
** Uphold your right to privacy - Use PGP. **
[-- Attachment #2 --]
#!/bin/sh
LOCK=/var/spool/lock

if [ -z "$1" ]
then
	cd ${LOCK}
	/bin/ls LCK..* > /tmp/locks$$ 2>/dev/null
	if [ ! -s /tmp/locks$$ ]
	then
		echo No ports in use.
		exit 0
	fi
	PORT=`cat /tmp/locks$$ | head -1 | sed 's/^LCK\.\.//'`
	echo Warning: using port ${PORT}
else
	PORT=${1}
	if [ ! -c /dev/${PORT} ]
	then
		echo error: no such port ${PORT}
		exit 1
	fi
fi

# if a lock file does not exist, then obviously the port is not in use.

if [ ! -f ${LOCK}/LCK..${PORT} ]
then
	PORTSTAT="not in use"
else

# If a lock file exists, but the pid does not exist, it is stale, ergo
# it is not in use.
#
# The head/awk stuff is for those bizarro programs that store more than
# the pid in the lockfile (e.g. minicom).

	PID=`cat ${LOCK}/LCK..${PORT} | head -1 | awk '{ print $1 }'`

# save a copy of the process
	ps ax | awk '{ print $1 " " $5 }' | grep "${PID}" > /tmp/portstat$$

# if file is zero-length, it don't exist
	if [ ! -s /tmp/portstat$$ ]
	then
		PORTSTAT="not in use (stale lock exists)"
	else
# pids exist, so probe them
		PROGRAM=`cat /tmp/portstat$$ | awk '{ print $2 }'`
		if echo ${PROGRAM} | grep -i ppp > /dev/null 2>&1
		then
			PORTSTAT="in use by ppp"
		else
			PORTSTAT="in use by `cat /tmp/portstat$$ | awk \
					'{ print $2 }'`"
		fi
	fi
fi

echo "Status of ${PORT}: ${PORTSTAT}"
exit 0
help

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