> Perhaps you could tell us why you want to know? I have a fairly complex application with a lot of variables in terms of datasets either provided by JCL or dynamically, which are used by my app and/or by another program (FTP actually) that I load dynamically. I need very specific output behavior in spite of arguably illogical conditions because I need to strictly imitate the behavior of another program (and you know how customers can be <g>). I am seeing some differences in behavior between JES2 and JES3 and I am trying to compensate for that programmatically. There seem to be some differences, for example, in how each handles the situation where the same DD SYSOUT is opened multiple times by successive programs, particularly if they use slightly different DCB attributes (F versus FA, for example).
Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of McKown, John Sent: Tuesday, February 07, 2006 12:18 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: Simplest way for app to tell if JES2 or JES3 environment? > -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of Charles Mills > Sent: Tuesday, February 07, 2006 11:46 AM > To: IBM-MAIN@BAMA.UA.EDU > Subject: Re: Simplest way for app to tell if JES2 or JES3 environment? > > > > IAZXJSAB macro, with the COMPID parameter will tell you that. > > Okay, totally dumb follow-up question. COMPID= is documented > as Specifies > the location where the system is to return the 4-character name of the > subsystem that created the JSAB. > > Question: is the "name" of JES2 or JES3 always "JES2" or > "JES3"? If a shop > renamed their startup PROC JES2TEST or JES3V1R7 would COMPID= > still return > "JES2" or "JES3"? > > Charles No, the name of JES2 is not always "JES2". I've run what was (is?) called PolyJES where I have multiple, separate JES2 subsystems running on a single MVS image, each called something different. Rember that a subsystem can be a max of 4 characters, so JES2TEST is not possible. I have run with JESA, however. If you're a pervert, you could run JES2 and call it "JES3" <grin>. Perhaps you could tell us why you want to know? For instance something like: "I know that if I'm running JES3, then I can do ... and it will work." Where "..." is something that is JES3 only such as DJC (Dependant Job Control). The field SSCTSSID will tell if this is JES2, JES3, or "other" (what other?). I think you must "chain chase" to find this control block. I haven't tried, but the book "z/OS: MVS Using the Subsystem Interface" indicates that you can use an SSI call of "15" to obtain the address of the SSCVT that corresponds to a specific subsystem. If there is an easier way, hopefully somebody will speak up. ---------------------------------------------------------------------- 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
