#!/bin/sh
# 
# check_solaris_freemem.sh - Check free physical memory for Solaris
#
# Free memory counted as
# pagesize * (system_pages.freemem - system_pages.lotsfree)
#
# $Id: check_solaris_freemem.sh 63 2010-06-22 12:09:14Z mit $
# (C) Andrey Mitroshin <mit@akamit.com>
# Released under the GNU General Public License (GPL)
#

STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3
STATE_DEPENDENT=4

usage () {
	printf "\n%s - Check free physical memory in Solaris\n" $0
	printf "$Id: check_solaris_freemem.sh 63 2010-06-22 12:09:14Z mit $"
	printf "\nUsage: %s: -w warn_threshold -c crit_threshold" $0
	printf "where warn_threshold and crit_threshold measured in megabytes\n"
}


if [ x`uname -s` != xSunOS ]; then
	printf "\n$0: must be run under SunOS\n\n" $0
	exit ${STATE_UNKNOWN}
fi

warn=
crit=

while getopts w:c: o
do
	case $o in
		w)
			warn="$OPTARG"
			;;
		c)
			crit="$OPTARG"
			;;
		?)
			usage
			exit ${STATE_UNKNOWN}
			;;
	esac
done

if [ x$warn = x -o x$crit = x ]; then
	usage
	exit ${STATE_UNKNOWN}
fi

lotsfree=`kstat -p unix:0:system_pages:lotsfree | awk '{print $NF}'`
freemem=`kstat -p unix:0:system_pages:freemem | awk '{print $NF}'`
pagesize=`pagesize`

freephys=`echo "$pagesize * ( $freemem - $lotsfree ) / 1024 / 1024" | bc`

if [ $freephys -lt $crit ]; then
	echo "CRITICAL: free $freephys MB"
	exit ${STATE_CRITICAL}
fi

if [ $freephys -lt $warn ]; then
	echo "WARNING: free $freephys MB"
	exit ${STATE_WARNING}
fi

echo "OK: free $freephys MB"
exit ${STATE_OK}