Function fuse_reply_err 

pub unsafe extern "C" fn fuse_reply_err(
    req: fuse_req_t,
    err: c_int,
) -> c_int

Reply with an error code or success

Possible requests: all except forget

unlink, rmdir, rename, flush, release, fsync, fsyncdir, setxattr, removexattr and setlk may send a zero code

@param req request handle @param err the positive error value, or zero for success @return zero for success, -errno for failure to send reply