On the z/OS V2.x systems that I can access, the PDS (not PDSE) with the IBM-supplied C headers is <syshlq>.SIEAHDR.H where <syshlq> is whatever your z/OS install process set up. Many IRXxxxxx headers are already done for you by IBM.
HTH Peter From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of David Crayford Sent: Wednesday, November 15, 2023 8:12 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: External Functions in C on z/OS There isn’t an R0 issue. IRXINIT(‘FINDENVB’) will fetch the environment block. All of the REXX mapping macros have been converted to C structures and can be found in /usr/include/zos (there is a PDS/E but I can’t remember what it's called). FWIW, writing external functions in C/C++ is a bad idea unless it’s main routine. The overhead of standing up and ripping down an LE environment is huge. Metal/C is an option. It’s one of the reasons why I don’t like REXX, it’s difficult to extend with languages other than assembler which makes it useless for what I want for a glue language. -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
