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? -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/1126#issuecomment-580242921 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1