Function fsetxattr 

pub fn fsetxattr<S, B>(fd: RawFd, name: S, value: B, flags: Flags) -> Result<()>
where
    S: AsRef<OsStr>,
    B: AsRef<[u8]>,

Sets the value of the extended attribute identified by name and associated with the file specified by the open file descriptor fd.

For more information, see fsetxattr(2)