/usr/share/phoronix-test-suite/pts-core/objects/phodevi/sensors/sys_iowait.php is in phoronix-test-suite 4.8.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
Phoronix Test Suite
URLs: http://www.phoronix.com, http://www.phoronix-test-suite.com/
Copyright (C) 2009 - 2011, Phoronix Media
Copyright (C) 2009 - 2011, Michael Larabel
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 3 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, see <http://www.gnu.org/licenses/>.
*/
class sys_iowait implements phodevi_sensor
{
public static function get_type()
{
return 'sys';
}
public static function get_sensor()
{
return 'iowait';
}
public static function get_unit()
{
return 'Percent';
}
public static function support_check()
{
$test = self::read_sensor();
return is_numeric($test) && $test != -1;
}
public static function read_sensor()
{ $iowait = -1;
if(phodevi::is_linux() && is_file('/proc/stat'))
{
$start_stat = pts_file_io::file_get_contents('/proc/stat');
sleep(1);
$end_stat = pts_file_io::file_get_contents('/proc/stat');
$start_stat = explode(' ', substr($start_stat, 0, strpos($start_stat, "\n")));
$end_stat = explode(' ', substr($end_stat, 0, strpos($end_stat, "\n")));
for($i = 2, $diff_cpu_total = 0; $i < 9; $i++)
{
$diff_cpu_total += $end_stat[$i] - $start_stat[$i];
}
$diff_iowait = $end_stat[6] - $start_stat[6];
$iowait = pts_math::set_precision(1000 * $diff_iowait / $diff_cpu_total / 10, 2);
}
return $iowait;
}
}
?>
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