#!/usr/bin/perl -w
# -*- perl -*-

=head1 NAME

dar_vmstat - Munin plugin to monitor darwin virtual memory usage.

=head1 APPLICABLE SYSTEMS

Should work on any darwin (Mac OS X) system with the 'vm_stat' command.

=head1 CONFIGURATION

None needed

=head1 INTERPRETATION

The plugin runs the vm_stat command a shows the results.  Consult the
vm_stat man page for more information on the output.

=head1 BUGS

None right now.

=head1 MAGIC MARKERS

  #%# family=auto
  #%# capabilities=autoconf

=head1 VERSION

  v.0.0.1

=head1 AUTHOR

Copyright (C) 2010.

Original version by J.T.Sage (at) gmail (dot) com.

=head1 LICENSE

GPLv2

=cut

use Munin::Plugin;

if ( defined($ARGV[0])) {
    if ($ARGV[0] eq 'autoconf') {
	$uname = `uname`;
	if ( not ( $uname =~ /Darwin/ ) ) { print "no (not a Darwin System)\n"; }
	else {
		if ( not -x "/usr/bin/vm_stat" ) { print "no (vm_stat not found)\n"; }
		else {
			print "yes\n";
		}
	}
	exit 0;
    }

    if ( $ARGV[0] eq "config" ) {
	print "graph_title Virtual Memory Statiscs\n";
	print "graph_args --base 1000 -l 0\n";
	print "graph_vlabel bytes\n";
	print "graph_scale yes\n";
	print "graph_category system\n";
	@vmstat = `vm_stat`;
	for ( $i = 1;  $i < $#vmstat; $i++ ) {
		$line = $vmstat[$i];
		$label = $line;
		$label =~ s/"//g;
		$label =~ s/(\w+)\:.+$/$1/;
		$label =~ s/\n//g;
		$name = $label;
		$name =~ tr/A-Z/a-z/;
		$name =~ s/[^A-Za-z0-9_]/_/g;
		if ( $name eq "pages_free" || $name eq "pages_active" || $name eq "pages_inactive" || $name eq "pages_speculative" || $name eq "pages_wired_down" ) {
			$label =~ s/Pages //;
			print $name, ".label ", $label, "\n";
			print $name, ".type GAUGE\n";
			print $name, ".cdef ", $name, ",4096,*\n";
		}
	}
	exit 0;
    }
}

@vmstat = `vm_stat`;
for ( $i = 1;  $i < $#vmstat; $i++ ) {
	$line = $vmstat[$i];
	$label = $line;
	$label =~ s/"//g;
	$label =~ s/(\w+)\:.+$/$1/;
	$label =~ s/\n//g;
	$name = $label;
	$name =~ tr/A-Z/a-z/;
	$name =~ s/[^A-Za-z0-9_]/_/g;
	$data = $line;
	$data =~ s/.+?(\d+)\./$1/;
	$data =~ s/\n//g;
	#$data = int(($data / 1000) + .5);
	if ( $name eq "pages_free" || $name eq "pages_active" || $name eq "pages_inactive" || $name eq "pages_speculative" || $name eq "pages_wired_down" ) {
		print $name, ".value ", $data, "\n";
	}

}



# vim:syntax=perl