#!/usr/bin/perl
#
# turbo - Toggle the turbo button. Unix/Linux.
#
# Once upon a time computers were made with a physical turbo button
#  that doubled the CPU speed. These days we need to make do with a script.
#
# 22-Sep-2004	ver 1.00
#
# USAGE: turbo
#
# WARNING: Use of the turbo setting may cause CPU overheating.
#
# COPYRIGHT: Copyright (c) 2004 Brendan Gregg.
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
#  (http://www.gnu.org/copyleft/gpl.html)
#
# 22-Sep-2004	Brendan Gregg	Created this.


$turbofile = "/etc/turbo.conf";

#
#  Fetch current state
#
if (open(TURBO,"$turbofile")) {
	while (chomp($line = <TURBO>)) {
		($state) = $line =~ /^TURBO=(.*)/ if $line =~ /^TURBO=/;
	}
	close TURBO;
} else {
	$state = "off";
}

#
#  Toggle turbo button
#
if ($state eq "off") {
	$state = "on";
	$CPU = $CPU * 2;
} else {
	$state = "off";
	$CPU = $CPU * 1/2;
}

#
#  Save new state
#
open(TURBO,">$turbofile") || do {
	print STDERR "ERROR1: Only root can press the turbo button.\n";
	exit 1;
};
print TURBO "#\n# turbo.conf\n#\n# Configuration parameters for turbo.\n";
print TURBO "# Do NOT edit this file by hand -- use turbo(1m) instead.\n#\n";
print TURBO "TURBO=$state\n";
close TURBO;

print "TURBO is now $state\n";