I'm curious if anybody knows how z/OS actually processes the OPEN for a DUMMY DD statement. I know that basically output is ignored and input causes an immediate EOF. But I wondering if OPEN is smart enough that if a file is opened for OUTPUT, the address in the DCB is simply to a IEFBR14 type module, or is it more complicated that that? Does it even bother to validate the LRECL, BLKSIZE, and RECFM? If so, why? Just to be compatible? Does it bother to get I/O buffers? Why?
I guess INPUT would be more difficult, but perhaps a dynamically created I/O module which invokes the EODAD immediately or goes to an ABEND subroutine if there is no EODAD or if the EODAD is to be executed a second time. Same question about LRECL, BLKSIZE, RECFM, and I/O buffers. Just curious at the end of the year freeze. -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology The information contained in this e-mail message may be privileged and/or confidential. It is for intended addressee(s) only. If you are not the intended recipient, you are hereby notified that any disclosure, reproduction, distribution or other use of this communication is strictly prohibited and could, in certain circumstances, be a criminal offense. If you have received this e-mail in error, please notify the sender by reply and delete this message without copying or disclosing it. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
