The protocol spec does not, in many isntance, require that a server
implement the corresponding action and leaves it unspecified what the
server does when an unsupported flag is set. As I said, these flags are
defined so that should a server wish to support the feature that is the
flag that must be used. I see tat we both have dug in our heels on this
one. You say if it's defined it has to do something and I say f it's
defined but not supported it should not do anythng eveil but it need not
do anything useful either. The mistake here is exposing it in the client
API which, arguably, would seem to imply it actually does something.
I suppose we could make the server check but then we would need to do this
in many other places as we have defined flags that are not (yet)
supported. The current approach has been like this for some 20 years with
no complaints. So, why all of a sudden is this a real issue?
On Thu, 30 Jan 2020, murrayc3 wrote:
> Looking at the following XRootD protocol code I can see that there is a protocol flag for each desired type of open including read:
>
> [itctabuild02] xrdcl_tests (master) > vi /usr/include/xrootd/XProtocol/XProtocol.hh
> ...
> enum XOpenRequestOption {
> kXR_compress = 1, // also locate (return unique hosts)
> kXR_delete = 2,
> kXR_force = 4,
> kXR_new = 8,
> kXR_open_read= 16,
> kXR_open_updt= 32,
> kXR_async = 64,
> kXR_refresh = 128, // also locate
> kXR_mkpath = 256,
> kXR_prefname = 256, // only locate
> kXR_open_apnd= 512,
> kXR_retstat = 1024,
> kXR_replica = 2048,
> kXR_posc = 4096,
> kXR_nowait = 8192, // also locate
> kXR_seqio =16384,
> kXR_open_wrto=32768
> };
>
> In other words read on the wire is not represented by a 0 and from what I can tell 0 means nothing/none. Would you not be able to modify the XRootD server code to return an error to the client when there are leftover flags that its translation logic has not translated/consumed?
>
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