#!/usr/bin/perl -w
#
# Copyright (c) 2014  Sulev-Madis Silber <ketas@si.pri.ee>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#


use strict;
use warnings FATAL => 'all';

use BSD::Sysctl qw(sysctl sysctl_set);


$| = 1;


my ($mode) = @ARGV;


die unless $mode;


my $proctitle_prefix = 'sysctl';


if ($mode eq 'set')
{
	$0 = sprintf "%s %s", $proctitle_prefix, $mode;
	
	
	while (<STDIN>)
	{
		if (/^\s*((?:dev\.am335x_pwm\.[12]\.(?:period|duty[AB]))|dev\.ti_adc\.0\.ain\.[0-7]\.enable)=(\d{1,10})\s*$/)
		{
			sysctl_set $1, $2;
		}
		elsif (/^kill$/i)
		{
			exit;
		}
	}
}
elsif ($mode eq 'get')
{
	$0 = sprintf "%s %s", $proctitle_prefix, $mode;
	
	
	while (<STDIN>)
	{
		if (/^\s*(vm\.loadavg|dev\.ti_adc\.0\.ain\.[0-7]\.input|kern\.(?:boottime|version))\s*$/)
		{
			my $sysctl = $1;
			
			
			my $result = sysctl $sysctl;
			
			
			next unless defined $result;
			
			
			my $value;
			
			
			if (ref $result eq 'ARRAY')
			{
				$value = join ' ', @$result;
			}
			else
			{
				$value = $result;
			}
			
			
			$value =~ s/\n//g;
			
			
			printf "%s=%s\n",
				$sysctl,
				$value;
		}
	}
}
else
{
	die;
}