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    my $owner_uid = $fl->owner || 0;

This method returns the numeric user ID of lock file's owner or undef otherwise

=head2 pid

    my $pid = $fl->pid;

Accessor for the pid being saved to the lock file.

=head2 unlock

    $self = $self->unlock;

This method performs unlocking the lock file and removes it

=head1 HISTORY

See C<Changes> file

=head1 TO DO

See C<TODO> file

=head1 SEE ALSO

L<Lock::File>, L<File::TinyLock>, L<JIP::LockFile>, L<LockFile::Simple>,
L<Acrux::FilePid>

=head1 AUTHOR

Serż Minus (Sergey Lepenkov) L<https://www.serzik.com> E<lt>abalama@cpan.orgE<gt>

=head1 COPYRIGHT

Copyright (C) 1998-2026 D&D Corporation

=head1 LICENSE

This program is distributed under the terms of the Artistic License Version 2.0

See the C<LICENSE> file or L<https://opensource.org/license/artistic-2-0> for details

=cut

use Carp qw/croak/;
use File::Spec;
use File::stat qw//;
use File::Basename qw/basename/;
use Cwd qw/getcwd/;

use constant {
        RETRIES     => 5,
        DELAY       => 60,
    };

sub new {
    my $class = shift;
    my $args = @_ ? @_ > 1 ? {@_} : {%{$_[0]}} : {};
    my $self  = bless {%$args}, $class;
    $self->{debug}      ||= 0;
    $self->{error}      = "";
    $self->{file}       //= File::Spec->catfile(getcwd, sprintf("%s.lock", basename($0)));
    $self->{pid}        ||= $$; # Current PID by default
    $self->{own}        ||= 0; # Owner PID
    $self->{auto}       //= 0;
    $self->{retries}    //= RETRIES;
    $self->{delay}      //= DELAY;
    $self->{_is_locked} = 0;
    croak("Incorrect pid attribute") unless $self->{pid} =~ /^[0-9]{1,11}$/;
    croak("Incorrect retries attribute") unless $self->{retries} =~ /^[0-9]{1,5}$/;
    croak("Incorrect delay attribute") unless $self->{delay} =~ /^[0-9]{1,5}$/;

    # Lock file
    return $self->lock if $self->{auto};
    return $self;
}

sub file { shift->{file} }
sub pid { shift->{pid} }
sub own { # own pid
    my $self = shift;
    if (scalar(@_) >= 1) {
        $self->{own} = shift;
        return $self;
    }
    return $self->{own};
}
sub owner { # numeric user ID of file's owner
    my $self = shift;
    return unless length($self->file) && -f $self->file;
    return File::stat::stat($self->file)->uid;
}
sub error {
    my $self = shift;
    if (scalar(@_) >= 1) {
        $self->{error} = shift;
        return $self;
    }
    return $self->{error};
}
sub lock {
    my $self = shift;
    if ($self->_is_locked) {
        $self->_debug(sprintf("File %s already locked", $self->file));
        return $self;
    }

    # Signals
    $SIG{HUP} = $SIG{QUIT} = $SIG{INT} = $SIG{TERM} = sub {
        $self->_debug( "Caught SIG$_[0]" );
        exit;
    };

    # Save temp file
    my $tmp_file = sprintf("%s.%d", $self->file, $self->pid);
    if (open(my $fh, '>', $tmp_file)) {
        printf $fh "%d\n", $self->pid || $$;
        close $fh;