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package Sys::CpuLoad;
# ABSTRACT: retrieve system load averages
# Copyright (c) 1999-2002 Clinton Wong. All rights reserved.
# This program is free software; you can redistribute it
# and/or modify it under the same terms as Perl itself.
use v5.6;
use strict;
use warnings;
use parent qw(Exporter);
use File::Which qw(which);
use IO::File;
use IPC::Run3 qw(run3);
use XSLoader;
our @EXPORT = qw();
our @EXPORT_OK = qw(load getloadavg proc_loadavg uptime);
our $VERSION = '0.25';
XSLoader::load 'Sys::CpuLoad', $VERSION;
=head1 DESCRIPTION
This module retrieves the 1 minute, 5 minute, and 15 minute load average
of a machine.
=head1 SYNOPSIS
use Sys::CpuLoad 'load';
print '1 min, 5 min, 15 min load average: ',
join(',', load()), "\n";
=export load
This method returns the load average for 1 minute, 5 minutes and 15
minutes as an array.
On Linux, Solaris, FreeBSD, NetBSD and OpenBSD systems, it will make a
call to L</getloadavg>.
If F</proc/loadavg> is available on non-Cygwin systems, it
will call L</proc_loadavg>.
Otherwise, it will attempt to parse the output of C<uptime>.
On error, it will return an array of C<undef> values.
If you are writing code to work on multiple systems, you should use
this function. But if your code is intended for specific systems,
then you should use the appropriate function.
=export getloadavg
This is a wrapper around the system call to C<getloadavg>.
If this call is unavailable, or it is fails, it will return C<undef>.
Added in v0.22.
=export proc_loadavg
If F</proc/loadavg> is available, it will be used.
If the data cannot be parsed, it will return C<undef>.
Added in v0.22.
=head2 uptime
Parse the output of uptime.
If the L<uptime> executable cannot be found, or the output cannot be
parsed, it will return C<undef>.
Added in v0.22.
As of v0.24, you can override the executable path by setting
C<$Sys::CpuLoad::UPTIME>, e.g.
use Sys::CpuLoad 'uptime';
no warnings 'once';
$Sys::CpuLoad::UPTIME = '/usr/bin/w';
@load = uptime();
=cut
sub proc_loadavg {
if ( -r '/proc/loadavg' ) {
my $fh = IO::File->new( '/proc/loadavg', 'r' );
if ( defined $fh ) {
my $line = <$fh>;
$fh->close();
if ( $line =~ /^(\d+\.\d+)\s+(\d+\.\d+)\s+(\d+\.\d+)/ ) {
return ( $1, $2, $3 );
}
}
}
return undef;
}
our $UPTIME;
sub uptime {
local %ENV = %ENV;
$ENV{'LC_NUMERIC'} = 'POSIX'; # ensure that decimal separator is a dot
$UPTIME ||= which("uptime") or
return undef;
run3($UPTIME, \undef, \my $line);
return undef if $? || !defined($line);
if ( $line =~ /(\d+\.\d+)\s*,?\s+(\d+\.\d+)\s*,?\s+(\d+\.\d+)\s*$/m )
{
return ( $1, $2, $3 );
}
return undef;
}
sub BEGIN {
my $this = __PACKAGE__;
my $os = lc $^O;
if ( $os =~ /^(darwin|dragonfly|(free|net|open)bsd|linux|solaris|sunos)$/ ) {
no strict 'refs'; ## no critic (ProhibitNoStrict)
*{"${this}::load"} = \&getloadavg;
}
elsif ( -r '/proc/loadavg' && $os ne 'cygwin' ) {
no strict 'refs'; ## no critic (ProhibitNoStrict)
*{"${this}::load"} = \&proc_loadavg;
}
else {
no strict 'refs'; ## no critic (ProhibitNoStrict)
*{"${this}::load"} = \&uptime;
}
}
=head1 SEE ALSO
L<Sys::CpuLoadX>
=cut
1;
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