Thanks! At least too many OPEN's is better than too many DYNALLOC's *and* too many OPEN's.
> There isn't a way to update (or get) the PDS directory user data Not a huge deal to write your own BPAM library, but I agree. When I first came to z/OS C/C++ about two years ago I was surprised that there were not more z/OS-specific library routines (or z/OS-specific enhancements to the inherited-from-UNIX library routines). Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On Behalf Of Kirk Wolf Sent: Monday, April 30, 2012 11:11 AM To: IBM-MAIN@bama.ua.edu Subject: Re: Does C/LE open of DD:ddname(member) use SVC 99 or FIND? Charles, I'm nearly certain that it doesn't do a SVC99 when you are using fopen with a DDNAME But it does seem to do a OPEN/BLDL/POINT....STOW/CLOSE for each fopen() / fclose() using //DD:MYDD(MEM) IMO, there are a couple of important missing things: 1) There isn't a way to update (or get) the PDS directory user data when processing the member with fopen()/fclose(). 2) You would really like to be able to do this: fopen(//DD:MYDD(MEM1), ...) freopen(//DD:MYDD(MEM2), ....) so that the freopen() caused a STOW (if opened update) and a BLDL/POINT, and avoided the cost of a complete OPEN/CLOSE path. I don't think that it does that. So, for my money, better BPAM support would be nice. Kirk Wolf Dovetailed Technologies http://dovetail.com On Mon, Apr 30, 2012 at 11:45 AM, Charles Mills <charl...@mcn.org> wrote: > Does anyone *know* whether a C/C++ Language Environment fopen() of a > filename of the form DD:ddname(member) use an OPEN of ddname followed > by a BLDL or FIND for member (the way any reasonable programmer would) > or does it do a whole new DYNALLOC for dsname(member)? (Seems like a > dumb question, but FTP does it that way, so stranger things have > happened.) > > My *interpretation* of the allocation messages - I don't see allocate > and de-allocate messages for a SYSnnnnn that appears to be for member > - leads me to believe that C/C++ LE does it right. But I could be > reading it wrong. > Does anyone *know*? > > Thanks, > Charles > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to lists...@bama.ua.edu with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN
