Jim is the ultimate person to be saying such a thing. He is echoing what I have heard for 30 years. We looked at a product that did the dynamic steplib back in the 70's (IIRC) and asked around about the reputation and got back from IBM & Guide people the same response. We told the user that IBM did not approve of the idea and that we didn't want to take a chance.
Ed From: Gerhard Postpischil <[email protected]> To: [email protected] Sent: Fri, July 22, 2011 11:43:45 PM Subject: Re: dynamic STEPLIB On 7/22/2011 3:06 PM, Jim Mulder wrote: > The only supported mechanism in MVS for adding to the > module library search order within as address space is an ATTACH with > a TASKLIB. This is the only supported way to set TCBJLB. As I'm sure you're aware, many users have requirements that are not satisfied by "supported" methods. I've been at this since the 709, and have had no problem finding things that could be improved. For some users it's a simple trade-off between increased productivity at the expense of some testing after system changes. Many features of zOS exist as a result of user requests, SHARE resolutions, and similar sources. > Any program which modifies TCBJLB in an existing TCB is > wrong to do so. I would recommend against having any such > program installed on your system. The STEPLIB program has existed for decades without problems. While I can only speak for the version I'm using, it's reliable. In a sandbox environment it saves significant time for program development and testing, to the point where even an occasional system crash (not yet observed) would be an acceptable trade-off. Additionally, mine has an APF option, allowing the DEB to be flagged authorized, which saves yet more time developing system utilities. While there was an integrity exposure when it was first written, with modern security it's safe enough to put on a production system, not that I'd recommend that. Gerhard Postpischil Bradford, VT ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- 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
