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: background.go
    path of file: ./repos/arvados/lib/crunchrun
    
    the code of the file until where you have to start completion: // Copyright (C) The Arvados Authors. All rights reserved.
//
// SPDX-License-Id
    
func kill(uuid string, signal syscall.Signal, stdout, stderr io.Writer) error {
	path := filepath.Join(lockdir, lockprefix+uuid+locksuffix)
	f, err := os.Open(path)
	if os.IsNotExist(err) {
		return nil
	} else if err != nil {
		return fmt.Errorf("open %s: %s", path, err)
	}
	defer f.Close()

	var pi procinfo
	err = json.NewDecoder(f).Decode(&pi)
	if err != nil {
		return fmt.Errorf("decode %s: %s", path, err)
	}

	if pi.UUID != uuid || pi.PID == 0 {
		return fmt.Errorf("%s: bogus procinfo: %+v", path, pi)
	}

	proc, err := os.FindProcess(pi.PID)
	if err != nil {
		// FindProcess should have succeeded, even if the
		// process does not exist.
		return fmt.Errorf("%s: find process %d: %s", uuid, pi.PID, err)
	}

	// Send the requested signal once, then send signal 0 a few
	// times.  When proc.Signal() returns an error (process no
	// longer exists), return success.  If that doesn't happen
	// within 1 second, return an error.
	err = proc.Signal(signal)
	for deadline := time.Now().Add(time.Second); err == nil && time.Now().Before(deadline); time.Sleep(time.Second / 100) {
		err = proc.Signal(syscall.Signal(0))
	}
	if err == nil {
		// Reached deadline without a proc.Signal() error.
		return fmt.Errorf("%s: pid %d: sent signal %d (%s) but process is still alive", uuid, pi.PID, signal, signal)
	}
	fmt.Fprintf(stderr, "%s: pid %d: %s\n", uuid, pi.PID, err)
	return nil
}