/usr/share/perl5/Sys/Statistics/Linux/FileStats.pm is in libsys-statistics-linux-perl 0.66-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 | =head1 NAME
Sys::Statistics::Linux::FileStats - Collect linux file statistics.
=head1 SYNOPSIS
use Sys::Statistics::Linux::FileStats;
my $lxs = Sys::Statistics::Linux::FileStats->new;
my $stat = $lxs->get;
=head1 DESCRIPTION
Sys::Statistics::Linux::FileStats gathers file statistics from the virtual F</proc> filesystem (procfs).
For more information read the documentation of the front-end module L<Sys::Statistics::Linux>.
=head1 FILE STATISTICS
Generated by F</proc/sys/fs/file-nr>, F</proc/sys/fs/inode-nr> and F</proc/sys/fs/dentry-state>.
fhalloc - Number of allocated file handles.
fhfree - Number of free file handles.
fhmax - Number of maximum file handles.
inalloc - Number of allocated inodes.
infree - Number of free inodes.
inmax - Number of maximum inodes.
dentries - Dirty directory cache entries.
unused - Free diretory cache size.
agelimit - Time in seconds the dirty cache entries can be reclaimed.
wantpages - Pages that are requested by the system when memory is short.
=head1 METHODS
=head2 new()
Call C<new()> to create a new object.
my $lxs = Sys::Statistics::Linux::FileStats->new;
It's possible to set the path to the proc filesystem.
Sys::Statistics::Linux::FileStats->new(
files => {
# This is the default
path => '/proc',
file_nr => 'sys/fs/file-nr',
inode_nr => 'sys/fs/inode-nr',
dentries => 'sys/fs/dentry-state',
}
);
=head2 get()
Call C<get()> to get the statistics. C<get()> returns the statistics as a hash reference.
my $stat = $lxs->get;
=head1 EXPORTS
No exports.
=head1 SEE ALSO
B<proc(5)>
=head1 REPORTING BUGS
Please report all bugs to <jschulz.cpan(at)bloonix.de>.
=head1 AUTHOR
Jonny Schulz <jschulz.cpan(at)bloonix.de>.
=head1 COPYRIGHT
Copyright (c) 2006, 2007 by Jonny Schulz. All rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
=cut
package Sys::Statistics::Linux::FileStats;
use strict;
use warnings;
use Carp qw(croak);
our $VERSION = '0.09';
sub new {
my $class = shift;
my $opts = ref($_[0]) ? shift : {@_};
my %self = (
files => {
path => '/proc',
file_nr => 'sys/fs/file-nr',
inode_nr => 'sys/fs/inode-nr',
dentries => 'sys/fs/dentry-state',
}
);
foreach my $file (keys %{ $opts->{files} }) {
$self{files}{$file} = $opts->{files}->{$file};
}
return bless \%self, $class;
}
sub get {
my $self = shift;
my $class = ref $self;
my $file = $self->{files};
my $stats = { };
$self->{stats} = $stats;
$self->_get_file_nr;
$self->_get_inode_nr;
$self->_get_dentries;
return $stats;
}
sub _get_file_nr {
my $self = shift;
my $class = ref $self;
my $file = $self->{files};
my $stats = $self->{stats};
my $filename = $file->{path} ? "$file->{path}/$file->{file_nr}" : $file->{file_nr};
open my $fh, '<', $filename or croak "$class: unable to open $filename ($!)";
@$stats{qw(fhalloc fhfree fhmax)} = (split /\s+/, <$fh>)[0..2];
close($fh);
}
sub _get_inode_nr {
my $self = shift;
my $class = ref $self;
my $file = $self->{files};
my $stats = $self->{stats};
my $filename = $file->{path} ? "$file->{path}/$file->{inode_nr}" : $file->{inode_nr};
open my $fh, '<', $filename or croak "$class: unable to open $filename ($!)";
@$stats{qw(inalloc infree)} = (split /\s+/, <$fh>)[0..1];
$stats->{inmax} = $stats->{inalloc} + $stats->{infree};
close($fh);
}
sub _get_dentries {
my $self = shift;
my $class = ref $self;
my $file = $self->{files};
my $stats = $self->{stats};
my $filename = $file->{path} ? "$file->{path}/$file->{dentries}" : $file->{dentries};
open my $fh, '<', $filename or croak "$class: unable to open $filename ($!)";
@$stats{qw(dentries unused agelimit wantpages)} = (split /\s+/, <$fh>)[0..3];
close($fh);
}
1;
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