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: term.go
    path of file: ./repos/awless/vendor/github.com/chzyer/readline
    
    the code of the file until where you have to start completion: // Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build darwin dragonfly freebsd linux,!appengine netbsd openbsd solaris

// Package terminal provides support functions for dealing with terminals, as
// comm
    
func ReadPassword(fd int) ([]byte, error) {
	oldState, err := getTermios(fd)
	if err != nil {
		return nil, err
	}

	newState := oldState
	newState.Lflag &^= syscall.ECHO
	newState.Lflag |= syscall.ICANON | syscall.ISIG
	newState.Iflag |= syscall.ICRNL
	if err := setTermios(fd, newState); err != nil {
		return nil, err
	}

	defer func() {
		setTermios(fd, oldState)
	}()

	var buf [16]byte
	var ret []byte
	for {
		n, err := syscall.Read(fd, buf[:])
		if err != nil {
			return nil, err
		}
		if n == 0 {
			if len(ret) == 0 {
				return nil, io.EOF
			}
			break
		}
		if buf[n-1] == '\n' {
			n--
		}
		ret = append(ret, buf[:n]...)
		if n < len(buf) {
			break
		}
	}

	return ret, nil
}