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: xattr.go
    path of file: ./repos/docker-ce/components/engine/vendor/github.com/containerd/continuity/sysx
    
    the code of the file until where you have to start completion: // +build linux darwin

/*
   Copyright The containerd Authors.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied
    
func listxattrAll(path string, listFunc listxattrFunc) ([]string, error) {
	buf := make([]byte, defaultXattrBufferSize)
	n, err := listFunc(path, buf)
	for err == unix.ERANGE {
		// Buffer too small, use zero-sized buffer to get the actual size
		n, err = listFunc(path, []byte{})
		if err != nil {
			return nil, err
		}
		buf = make([]byte, n)
		n, err = listFunc(path, buf)
	}
	if err != nil {
		return nil, err
	}

	ps := bytes.Split(bytes.TrimSuffix(buf[:n], []byte{0}), []byte{0})
	var entries []string
	for _, p := range ps {
		if len(p) > 0 {
			entries = append(entries, string(p))
		}
	}

	return entries, nil
}