Function get_xattr 

pub async fn get_xattr<T>(
    path: impl AsRef<Path>,
    name: impl AsRef<OsStr>,
    buffer: T,
) -> BufResult<usize, T>
where
    T: IoBufMut,

Available on crate feature fs and (Android or Linux) only.

Reads an extended attribute from a path, following the final symbolic link.

This has getxattr semantics, not lgetxattr semantics. To read from an already open file without resolving its pathname again, use File::get_xattr.

The value is written from the start of buffer, using its full capacity. On success, the result is the value’s length and the buffer’s initialized length advances to at least that length. With zero capacity, only the required length is returned and the buffer remains empty. The attribute may change between a sizing query and a subsequent read.

A missing attribute returns ENODATA; insufficient nonzero capacity returns ERANGE. Other OS errors are preserved. A path or name containing a NUL byte returns io::ErrorKind::InvalidInput. Errors return the original buffer without advancing its initialized length.

The submitted operation owns the path, name, and buffer until completion, even if this future is dropped. Cancellation does not return the buffer to the caller.