You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: gdbserver.go
    path of file: ./repos/delve/pkg/proc/gdbserial
    
    the code of the file until where you have to start completion: // This file and its companion gdbserver_conn implement a target.Interface
// backed by a connection to a debugger speaking the "Gdb Remote Serial
// Protocol".
//
// The "Gdb Remote Serial Protocol" is a low level debugging protocol
// originally designed so that gdb could be used to debug programs running
// in embedded envir
    
func (p *gdbProcess) Checkpoint(where string) (int, error) {
	if p.tracedir == "" {
		return -1, proc.ErrNotRecorded
	}
	resp, err := p.conn.qRRCmd("checkpoint", where)
	if err != nil {
		return -1, err
	}

	if !strings.HasPrefix(resp, checkpointPrefix) {
		return -1, fmt.Errorf("can not parse checkpoint response %q", resp)
	}

	idstr := resp[len(checkpointPrefix):]
	space := strings.Index(idstr, " ")
	if space < 0 {
		return -1, fmt.Errorf("can not parse checkpoint response %q", resp)
	}
	idstr = idstr[:space]

	cpid, err := strconv.Atoi(idstr)
	if err != nil {
		return -1, err
	}
	return cpid, nil
}