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        status_code	=> $code,
        status_message	=> $msg,
    } );

    debug("sending $code reply for $proto->{type} (from bkg)");
    syswrite( $fd, $response );
}

sub on_success {
    my $x  = shift;
    my $e  = shift;
    my $io      = shift;
    my $proto   = shift;
    my $req     = shift;

    reply( 200, 'OK', $io, $proto, $req );
}

sub on_failure {
    my $x  = shift;
    my $e  = shift;
    my $io      = shift;
    my $proto   = shift;
    my $req     = shift;

    reply( 500, 'Error', $io, $proto, $req );
}


sub in_background {
    my $func    = shift;
    my $io      = shift;
    my $proto   = shift;
    my $req     = shift;

    my $pid = fork();

    if( !defined($pid) ){
        problem("cannot fork: $!");
        reply( 500, 'Error', $io, $proto, $req );
        return ;
    }elsif( $pid ){
        # parent
        $io->shut();
        waitpid $pid, 0;
        return;
    }else{
        # child
        my $gpid = fork();

        if( $gpid ){
            # parent
            _exit(0);
        }else{
            # orphaned child
            eval {
                $func->($io, $proto, $req, @_);
            };
            if(my $e = $@){
                chomp $e;
                verbose("child error: $e");
                _exit(1);
            }
            _exit(0);
        }
    }
}

1;