Function fuse_reply_buf 

pub unsafe extern "C" fn fuse_reply_buf(
    req: fuse_req_t,
    buf: *const c_char,
    size: size_t,
) -> c_int

Reply with data

Possible requests: read, readdir, getxattr, listxattr

@param req request handle @param buf buffer containing data @param size the size of data in bytes @return zero for success, -errno for failure to send reply