}
	return buildUser(&pwd), err
}

func lookupUserId(uid string) (*User, error) {
	i, e := strconv.Atoi(uid)
	if e != nil {
		return nil, e
	}
	return lookupUnixUid(i)
}

func lookupUnixUid(uid int) (*User, error) {
	var pwd _C_struct_passwd
	var found bool

	err := retryWithBuffer(userBuffer, func(buf []byte) syscall.Errno {
		var errno syscall.Errno