#!/usr/bin/perl

use Getopt::Std;

if (!getopts("w:c:")) {
	print "active_mem UNKNOWN: incorrect arguments given\n";
	exit 3;
}

if (!open(MEM, "/proc/meminfo")) {
	print "active_mem UNKNOWN: unable to open /proc/meminfo\n";
	exit 3;
}

while (<MEM>) {
	if (/^MemTotal/) {
		chomp;
		@a = split;
		$tot = $a[1];
	}

	if (/^Active/) {
		chomp;
		@a = split;
		$act = $a[1];
	}
}

$pct = int($act * 100 / $tot);

if (defined($opt_c) and $pct > $opt_c) {
	print "active_mem CRITICAL: pct=$pct |active_mem=$pct%\n";
	exit 2;
}

if (defined($opt_w) and $pct > $opt_w) {
	print "active_mem WARNING: pct=$pct |active_mem=$pct%\n";
	exit 2;
}

print "active_mem OK: pct=$pct |active_mem=$pct%\n";