Thanks Lizette, I had forgotten about LISTDSI. The context here was a need for an API callable from a batch COBOL program, but that could be done too, if somewhat clumsily due to the requirement for LISTDSI to be executed in a TSO environment.
I sent my co-worker on a search at cbttape.org for something he could use. Peter -----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of Lizette Koehler Sent: Thursday, May 14, 2020 12:03 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Is there any z/OS API to get byte file size for non-VSAM, non-zFS, non-database files? Well you might consider a REXX solution. For NON-VSAM on DISK you can use the LISTDSI command then convert tracks to bytes but using 1 Track = 56664 bytes For VSAM I do a LISTC and search for H-A--RBA and HI-U-RBA that is in bytes But not sure about an API that is available. Lizette -----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of Farley, Peter x23353 Sent: Thursday, May 14, 2020 8:55 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Is there any z/OS API to get byte file size for non-VSAM, non-zFS, non-database files? This question came to me from a co-worker: Is there any API to get the byte file size of a non-VSAM, non-zFS, non-database file in z/OS? I.E., byte file size for plain sequential files? I am aware of the "old way" of reading the VTOC of a volume to get the various DSCB's that total up disk extents, but that gets complicated quickly for multi-volume files, and was never guaranteed to be accurate as to the actual byte count of data in the file except in the RECFM=FS/FBS case anyway. There is always the performance-killing option of just reading the whole file and totaling up the length of every record (or block depending on how you structure the reads), but no one would call that an API. As far as I know there is no such API in z/OS, and this is what I told my co-worker, but am I wrong? Is there an alternative of which I am not aware? TIA for your input. Peter -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
