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Hi Joel, You are certainly now allowed to look at any file in the XProtocol directory as they are allow under a BSD license. That said, The 6 bit protocol version is really a capability level. But doesn't quite duplicate the protocol version number since you could conceivably adhere to a particular version of the protocol but not implement all of the possible capabilities. So, please look at XProtocol.hh XLoginVersion enum and you'll see the various levels there are. Also, you will see kXR_asyncap that is also in that field but outside the LoginVersion bits which indicate that the client support asynchronous responses. As for protocol version, yes it's Major.Minor.Patch (we've never used the patch level). It's somewhat unreliable because people compile with the latest headers but actually never implement a lot of the stuff so you can't derive much from the protocol version other than maybe displaying it. Finally, you will also see that part of the login request is an "ability" field. We use that in conjunction with CapVer (this is historical so it won't seem completely coherent) to establish what we can and cannot send to the client. Andy -----Original Message----- From: Joel Sent: Tuesday, March 13, 2018 7:20 AM To: [log in to unmask] Cc: Sebastien Binet ; Sébastien Gadrat Subject: Version protocol numbering, pval and capver Hello everyone, I do have a question on the XrootD Protocol Reference and I would like to avoid looking at the reference implementation. Since it only has 6 bits, how is the protocol version in `capver`[0] supposed to be formed in comparison to the general `kXR_PROTOCOLVERSION` (e.g. `pval` in kXR_protocol Request) value, which is represented by a 32bit number. For `kXR_PROTOCOLVERSION` I so far assumed a full number, containing major, minor and patch version, so for example Version 3.1.0 gets represented as "310", since this won't work with `capver`, should one only use the major version (e.g. "3"), or even major/minor version (e.g. "31") for that case? Thanks and Best regards, Joel [0]: http://www.xrootd.org/doc/dev45/XRdv310.htm#_Toc464248819 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-L list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-L&A=1 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-L list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-L&A=1