No, and I'm not even sure what the question means. If what you want is the sum of the record lengths then you have to read through the entire file and add up the lengths. If you want to know how big it will look to a Unix application hen you'll need to add the number of records to account for the LF or NL characters, unless the application is reading it as binary. The one exception is that if it is a valid FBS dataset then you can calculate the size.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Farley, Peter x23353 <[email protected]> Sent: Thursday, May 14, 2020 11:55 AM To: [email protected] 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 [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
