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package Proc::ProcessTable;
use 5.006;
use strict;
use warnings;
use Carp;
use Config;
use vars qw($VERSION @ISA @EXPORT @EXPORT_OK $AUTOLOAD);
require Exporter;
require DynaLoader;
@ISA = qw(Exporter DynaLoader);
# Items to export into callers namespace by default. Note: do not export
# names by default without a very good reason. Use EXPORT_OK instead.
# Do not simply export all your public functions/methods/constants.
@EXPORT = qw(
);
$VERSION = '0.59';
sub AUTOLOAD {
# This AUTOLOAD is used to 'autoload' constants from the constant()
# XS function. If a constant is not found then control is passed
# to the AUTOLOAD in AutoLoader.
my $constname;
($constname = $AUTOLOAD) =~ s/.*:://;
my $val = constant($constname, @_ ? $_[0] : 0);
if ($! != 0) {
if ($! =~ /Invalid/) {
$AutoLoader::AUTOLOAD = $AUTOLOAD;
goto &AutoLoader::AUTOLOAD;
}
else {
croak "Your vendor has not defined Proc::ProcessTable macro $constname";
}
}
eval "sub $AUTOLOAD { $val }";
goto &$AUTOLOAD;
}
bootstrap Proc::ProcessTable $VERSION;
# Preloaded methods go here.
use Proc::ProcessTable::Process;
use File::Find;
my %TTYDEVS;
our $TTYDEVSFILE = "/tmp/TTYDEVS_" . $Config{byteorder}; # Where we store the TTYDEVS hash
sub new
{
my ($this, %args) = @_;
my $class = ref($this) || $this;
my $self = {};
bless $self, $class;
mutex_new(1);
if ( exists $args{cache_ttys} && $args{cache_ttys} == 1 )
{
$self->{cache_ttys} = 1
}
if ( exists $args{enable_ttys} && (! $args{enable_ttys}))
{
$self->{enable_ttys} = 0;
if ($self->{'cache_ttys'}) {
carp("cache_ttys specified with enable_ttys, cache_ttys a no-op");
}
}
else
{
$self->{enable_ttys} = 1;
}
my $status = $self->initialize;
mutex_new(0);
if($status)
{
return $self;
}
else
{
return undef;
}
}
sub initialize
{
my ($self) = @_;
if ($self->{enable_ttys})
{
# Get the mapping of TTYs to device nums
# reading/writing the cache if we are caching
if( $self->{cache_ttys} )
{
require Storable;
if( -r $TTYDEVSFILE )
{
$_ = Storable::retrieve($TTYDEVSFILE);
%Proc::ProcessTable::TTYDEVS = %$_;
}
else
{
$self->_get_tty_list;
require File::Temp;
require File::Basename;
my($ttydevs_fh, $ttydevs_tmpfile) = File::Temp::tempfile('ProcessTable_XXXXXXXX', DIR => File::Basename::dirname($TTYDEVSFILE));
chmod 0644, $ttydevs_tmpfile;
Storable::store_fd( \%Proc::ProcessTable::TTYDEVS, $ttydevs_fh );
close $ttydevs_fh;
if( !rename $ttydevs_tmpfile, $TTYDEVSFILE )
{
my $err = $!;
unlink $ttydevs_tmpfile;
if( !-r $TTYDEVSFILE)
{
die "Renaming $ttydevs_tmpfile to $TTYDEVSFILE failed: $err";
}
# else somebody else obviously created the file in the meantime
}
}
}
else
{
$self->_get_tty_list;
}
}
# Call the os-specific initialization
$self->_initialize_os;
return 1;
}
###############################################
# Generate a hash mapping TTY numbers to paths.
# This might be faster in Table.xs,
# but it's a lot more portable here
###############################################
sub _get_tty_list
{
my ($self) = @_;
undef %Proc::ProcessTable::TTYDEVS;
find({ wanted =>
sub{
$File::Find::prune = 1 if -d $_ && ! -x $_;
my($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
$atime,$mtime,$ctime,$blksize,$blocks) = stat($File::Find::name);
$Proc::ProcessTable::TTYDEVS{$rdev} = $File::Find::name
if(-c $File::Find::name);
}, no_chdir => 1},
"/dev"
);
}
# Apparently needed for mod_perl
sub DESTROY {}
1;
__END__
=head1 NAME
Proc::ProcessTable - Perl extension to access the unix process table
=head1 SYNOPSIS
use Proc::ProcessTable;
my $p = Proc::ProcessTable->new( 'cache_ttys' => 1 );
my @fields = $p->fields;
my $ref = $p->table;
=head1 DESCRIPTION
Perl interface to the unix process table.
=head1 METHODS
=over 4
=item new
Creates a new ProcessTable object. The constructor can take the following
flags:
enable_ttys -- causes the constructor to use the tty determination code,
which is the default behavior. Setting this to 0 disables this code,
thus preventing the module from traversing the device tree, which on some
systems, can be quite large and/or contain invalid device paths (for example,
Solaris does not clean up invalid device entries when disks are swapped). If
this is specified with cache_ttys, a warning is generated and the cache_ttys
is overridden to be false.
cache_ttys -- causes the constructor to look for and use a file that
caches a mapping of tty names to device numbers, and to create the
file if it doesn't exist. This feature requires the Storable module.
By default, the cache file name consists of a prefix F</tmp/TTYDEVS_> and a
byte order tag. The file name can be accessed (and changed) via
C<$Proc::ProcessTable::TTYDEVSFILE>.
=item fields
Returns a list of the field names supported by the module on the
current architecture.
=item table
Reads the process table and returns a reference to an array of
Proc::ProcessTable::Process objects. Attributes of a process object
are returned by accessors named for the attribute; for example, to get
the uid of a process just do:
$process->uid
The priority and pgrp methods also allow values to be set, since these
are supported directly by internal perl functions.
=back
=head1 EXAMPLES
# A cheap and sleazy version of ps
use Proc::ProcessTable;
my $FORMAT = "%-6s %-10s %-8s %-24s %s\n";
my $t = Proc::ProcessTable->new;
printf($FORMAT, "PID", "TTY", "STAT", "START", "COMMAND");
foreach my $p ( @{$t->table} ){
printf($FORMAT,
$p->pid,
$p->ttydev,
$p->state,
scalar(localtime($p->start)),
$p->cmndline);
}
# Dump all the information in the current process table
use Proc::ProcessTable;
my $t = Proc::ProcessTable->new;
foreach my $p (@{$t->table}) {
print "--------------------------------\n";
foreach my $f ($t->fields){
print $f, ": ", $p->{$f}, "\n";
}
}
=head1 CAVEATS
Please see the file README in the distribution for a list of supported
operating systems. Please see the file PORTING for information on how
to help make this work on your OS.
=head1 AUTHOR
D. Urist, durist@frii.com
=head1 SEE ALSO
L<Proc::ProcessTable::Process>, L<perl(1)>.
=cut