Back when VS2 was created, one of the issues dealt with were security holes. In either release 1 (SVS) or release 2 (MVS), the real storage manager began presenting "new" pages caused by GETMAIN cleared to X'00', the auxiliary storage manager di likewise for "new" slots, and the contents supervisor cleared storage before doing a "scatter load" of a module.
If the storage is not cleared by the load module, it is cleared by the environment. So not being cleared in the module might make the module a speck smaller. pup ----- Bill Fairchild <[EMAIL PROTECTED] on 07/14/2005 11:32 AM ----- In a message dated 7/14/2005 1:25:32 A.M. Central Daylight Time, [EMAIL PROTECTED] writes: IIRC, DS 0H will fill with zeros just as will DC 0H. Why is the latter preferable? DS 'any operand' will not fill the reserved space with anything. The 0H in this case functions only to align to a half word boundary. DC 'any operand' will fill with X'00' bytes any space that is skipped over in order to provide the requested alignment, then generate the requested constant. But if the 'any operand' has a multiplier of 0, then no filling code of X'00' bytes is generated. In this case the 0H functions the same as if the DC were a DS, namely you get aligned to a half word boundary. Bill Fairchild ----------------------------------------- The information contained in this communication (including any attachments hereto) is confidential and is intended solely for the personal and confidential use of the individual or entity to whom it is addressed. The information may also constitute a legally privileged confidential communication. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this communication in error and that any review, dissemination, copying, or unauthorized use of this information, or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail, and delete the original message. Thank you ---------------------------------------------------------------------- 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
