Yes, if you use one of those options then the ddname will not be in the TIOT. If you open a DCB/ACB for a ddname allocated with one of those options, DCBTIO will be zero.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of Charles Mills <charl...@mcn.org> Sent: Monday, July 29, 2019 4:11 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: XTIOT impact? Thanks. That second link is real relevant, but not the clearest writing ever. "If your program searches the TIOT starting with where TCBTIO points ... that search will fail if the DD name is allocated with any of the three dynamic allocation options. ... Your program might be searching for a particular DD name, ..." That's me, and my caller is somewhat of an unknown, so might for all I know start using SVC 99 and one or more of those three options. But what exactly is the above saying? That if a DD is allocated with one of the three specified options, then the DD name will not be in the TIOT pointed to by TCBTIO? Or ... ? Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Seymour J Metz Sent: Monday, July 29, 2019 3:51 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: XTIOT impact? See https://secure-web.cisco.com/1o5I9YFik-oQsFQWZNjhm8l4LzTFSAEmat_V3ruLHdkJGmGHOzLH3_qq_xWcgq7al4HaYViLwy8_GnvRxwvWv5XMjWuicTMnsCk7VVgXRsO3QzXIb-PyC-MAInMYPNgm-jYL1ZEw8RCBGtyZxC2KPT3E0GQW_AIWl7JkSOvK-VO6-M1cWeUf8LIGhmH8pjGR4NFd4XXDBT1sLfHC_dv18sky6Ds93eUUnKMNBWacYZsPe-HLnBD4gj109QIUAfLM22ybcTbJg492gQNudz4RFEeY6Tjiw--6RLPngCxc4BuYnyllNA9_PHu_-z5MjEG7YXdjMRqE1yRctl5xu3xy3VKS66vwxn3ZB7PSC4K5BSnRFDbEAYAgBWl12NRHMfz9Wq0g1qnlgrTkZgEat027Dq2Sn49u0mA2ijMqjhxE-RlheMeQ_FCUd-nDwHmqCTrj_/https%3A%2F%2Fwww.ibm.com%2Fsupport%2Fknowledgecenter%2FSSLTBW_2.4.0%2Fcom.ibm.zos.v2r4.id ad400/bam12plan.htm and https://secure-web.cisco.com/1o5I9YFik-oQsFQWZNjhm8l4LzTFSAEmat_V3ruLHdkJGmGHOzLH3_qq_xWcgq7al4HaYViLwy8_GnvRxwvWv5XMjWuicTMnsCk7VVgXRsO3QzXIb-PyC-MAInMYPNgm-jYL1ZEw8RCBGtyZxC2KPT3E0GQW_AIWl7JkSOvK-VO6-M1cWeUf8LIGhmH8pjGR4NFd4XXDBT1sLfHC_dv18sky6Ds93eUUnKMNBWacYZsPe-HLnBD4gj109QIUAfLM22ybcTbJg492gQNudz4RFEeY6Tjiw--6RLPngCxc4BuYnyllNA9_PHu_-z5MjEG7YXdjMRqE1yRctl5xu3xy3VKS66vwxn3ZB7PSC4K5BSnRFDbEAYAgBWl12NRHMfz9Wq0g1qnlgrTkZgEat027Dq2Sn49u0mA2ijMqjhxE-RlheMeQ_FCUd-nDwHmqCTrj_/https%3A%2F%2Fwww.ibm.com%2Fsupport%2Fknowledgecenter%2FSSLTBW_2.4.0%2Fcom.ibm.zos.v2r4.id ad400/bam12appl.htm. -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of Charles Mills <charl...@mcn.org> Sent: Monday, July 29, 2019 3:00 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: XTIOT impact? The recent discussion here of TIOT lookup failing prompted me to inventory my code. I hear you all on GETDSAB but I have working code written in C++ that scans the TIOT, and it would be a lot less impact to resolve any problems there rather than calling out to a new GETDSAB routine. The existing code goes PSATOLD to TCBTIO to TIOT and scans looking for particular DD names. It only cares about DD exists or does not exist and a couple of flags; it does not chain to the JFCB. (Yeah, I know about SWA's.) What *exactly* is the difference/impact of an XTIOT? It looks to me like an XTIOT is just a regular TIOT but above the line. Is that right? If my code always runs AMODE 31 and makes no assumptions about the high-order bits of any pointers, will it be adversely impacted by an XTIOT? Thanks, Charles ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
