On Wed, 26 Jun 2019 at 10:04, Charles Mills <charl...@mcn.org> wrote:
> I get the difference between installation exits and other exits. A SYNAD > exit is certainly an exit, but it is not in the same class with an IEFU83 > exit. > > But I fail to get the distinction relative to CSVFETCH. Installation X wants > to monitor every QSAM close, so they write some code and install it as an > IEFU8x exit. Installation Y wants to monitor every LOAD/FETCH, so they write > some code and install it as a CSVFETCH exit. What is the fundamental > difference? UNIX and Windows (and more generally C) programmers would probably call the SYNAD type of exit a "callback". You use some mechanism (function pointer, name, whatever) to make known a routine to a service you call, and the service may, either exceptionally or as a routine part of what it does for a living, call your routine at some point in processing. I'm not sure what UNIX/Windows people call the CSVFETCH or IEFU83 kind of exit. Possibly "plugin"s? Hmmm... I see that for the versions of one of our products that run on UNIX and Windows, we call them "user exits". I don't know if that is standard terminology on those platforms, or something that was borrowed from our z/OS product, which has similar exits. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
