It does not matter to my original problem but do you get NULLFILE for a UNIX file? I seemed to recall something like '..HFS..' or something like that. Can't find any documentation.
Grrr. "The RDJFCB parameter list, the DCB, and the JFCB area specified in the exit list as well as the exit list itself must reside below 16 MB." I've got the DCB there of course but no spare room without shuffling other things. Solvable, but one more annoying complexity. I guess that's why we get the big bucks. Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of John McKown Sent: Tuesday, February 19, 2019 7:39 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Any easier way to determine if DD is dummy than GETDSAB? On Tue, Feb 19, 2019 at 9:20 AM Charles Mills <charl...@mcn.org> wrote: > I've got a requirement to determine whether a DD is allocated DUMMY. I know > how to find the TIOT, get the JFCB with SWAREQ, check for 'NULLFILE' and > loop through all of the JFCB chain. Is there any easier way? That's a lot > of > complexity for a simple question! > > Why? I'm trying to avoid an S013-64 on a BPAM file if the user does not > supply a DSN to a PROC. I'm defaulting the DSN to NULLFILE. I'd like to be > able to determine that from my program. > > The program is in IBM C but I can readily call out to assembler. The OPEN > for the BPAM DCB is in assembler, not using the C library. > RDJFCB will also return NULLFILE for a DD DUMMY. Unfortunately, it also returns that for a UNIX PATH= file. https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.2.0/com.ibm.zos.v2r2.idas300/rdjfcb.htm > > Thanks! > > Charles > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > -- I just burned 2000 calories! That's the last time I'll nap with brownies in the oven. Maranatha! <>< John McKown ---------------------------------------------------------------------- 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
