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lib/Acme/Ghost/FilePid.pm  view on Meta::CPAN

=head2 remove

    $fp->remove;

Removes the pid file from disk. Returns true on success, false on
failure.

=head2 running

    my $pid = $fp->running;
    die "Service already running: $pid" if $pid;

Checks to see if the pricess identified in the pid file is still
running. If the process is still running, the pid is returned. Otherwise
C<undef> is returned.

=head2 save

    $fp->save;

Writes the pid file to disk, inserting the pid inside the file.
On success, the object is returned. On failure, C<undef> is
returned.

=head1 HISTORY

See C<Changes> file

=head1 TO DO

See C<TODO> file

=head1 SEE ALSO

L<CTK::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::Basename qw//;
use IO::File qw//;

sub new {
    my $class = shift;
    my $args = @_ ? @_ > 1 ? {@_} : {%{$_[0]}} : {};
    my $self  = bless {%$args}, $class;
    $self->{autoremove} ||= $args->{auto} ? 1 : 0;
    $self->{autosave}   ||= $args->{auto} ? 1 : 0;;
    $self->{file}       //= File::Spec->catfile(File::Spec->tmpdir(), sprintf("%s.pid", File::Basename::basename($0)));
    $self->{pid}        ||= $$; # Current PID
    $self->{owner}      ||= 0; # Owner PID
    $self->{is_running} = -1; # Unknown (is as running)
    if ($self->{autosave}) {
        return $self->running ? $self : $self->save;
    }
    return $self->load;
}

sub file {
    my $self = shift;
    if (scalar(@_) >= 1) {
        $self->{file} = shift;
        return $self;
    }
    return $self->{file};
}
sub pid {
    my $self = shift;
    if (scalar(@_) >= 1) {
        $self->{pid} = shift;
        return $self;
    }
    return $self->{pid};
}
sub owner {
    my $self = shift;
    if (scalar(@_) >= 1) {
        $self->{owner} = shift;
        return $self;
    }
    return $self->{owner};
}
sub running {
    my $self = shift;
    my $owner  = $self->load->owner || 0; # Get PID from file
    my $r = kill(0, $owner) ? $owner : undef;
    $self->{is_running} = $r ? 1 : 0;
    return $r; # Is running?
}
sub remove {
    my $self = shift;
    my $file = $self->file;
    return $self unless -e $file;
    unlink $file;
    $self->owner(0); # Set owner PID to 0
    return $self;
}
sub save {
    my $self = shift;
    my $file = $self->file;
    my $pid  = $self->pid || $$;
       $self->owner($pid); # Set owner PID as current PID

    # Save PID to file
    my $fh = IO::File->new($file, "w");
    croak qq/Can't open file "$file": $!/ unless defined $fh;