IIRC this technique was fairly common in the old COBOL days. IIRC you could call an assembler routine passing the name of an FD and the program got passed the address of the DCB. I think has not worked in some time -- well, in some number of COBOL versions.
Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Bernd Oppolzer Sent: Wednesday, July 14, 2021 1:55 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Mixing C/C++ with LE-conforming IBM HLASM IMHO this is not a good idea, because the C/C++ runtime probably did more things than simply construct a DCB and open it; IMO it allocated storage for buffers etc., too. And if you "steal" the open DCB from it, you will leave the C/C++ runtime in an undefined state, at best, even if you plan not to use the C/C++ file functions after the fopen() call; you will have a storage leak IMO. And: no, I have no idea how to get the DCB from the C/C++ FILE structure. (I am a compiler maintainer myself, and I cannot imagine someone successfully using the DCBs, which are part of my Pascal File control structures, and doing I/O using them, this way "fooling" the Pascal runtime system ... but, who knows). ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
