Sam - Thanks and thanks.
I'm trying to write a C++ program that will allow "standard" z/OS utility linkage. It wants to look as much as possible like other programs that expect a parm 1 and a parm 2 passed via R1 -> words 0 and 1. I can do whatever I want on the C++ side but I would like the caller to be able to use "standard" linkage. The C++ program is big and involved and I really can't afford to give up the C/C++ library. I just ran an experiment and determined two things: 1. The C++ program can be loaded via "standard" assembler macros absent any CEE routines with no problems. I used LINKMVS from Rexx because it was easy to do. 2. However ... argv[0] = the C program's name; argv[1] = the first parameter passed on LINKMVS; the second parameter was nowhere to be found. This is a problem. I see writing an assembler stub to get control first, establish the LE environment, and then call the C++ main (or a "pseudo-" main), passing the two arguments somehow, probably as a list passed as argv[1]. Does anyone know an easier way? Seems like a pretty obvious need: write a C++ program that starts up with standard z/OS multiple-parameter-pointers-pointed-to-by-R1 linkage. Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of Sam Siegel Sent: Saturday, December 26, 2009 4:55 PM To: IBM-MAIN@bama.ua.edu Subject: Re: argv for z/OS C++ batch Charles, The other option you have is to look at METAL C or system C. Or a third party compiler. Regards, Sam On Sat, Dec 26, 2009 at 9:14 PM, Charles Mills <charl...@mcn.org> wrote: > Trying to figure out this subject. > > > > The C/C++ Language Reference on p. 207 says "Under z/OS batch . argv[0] > Returns the program name in uppercase argv[1 to n] Returns the arguments as > you enter them." Not the most useful documentation - I don't think "as you > enter them" is terribly clear as it pertains to z/OS batch. > > > > The C/C++ User's Guide on p. 70 says "When NOARGPARSE is in effect, > arguments on the invocation line are not parsed, argc has a value of 2, and > argv contains a pointer to the string." > > > > Question: Does anyone know if a NOARGPARSE C++ program called via LINK or > ATTACH would receive parm 2 - the second word pointed to by R1 - anywhere? > Is there a recommended way to do this? > > > > What I'd like to end up with is a C program that "did me no favors" - if > invoked from JCL EXEC, then argv[1] would point to the PARM= string if any > ("as is") and if called via LINK or ATTACH would get the vector pointed to > by the caller's R1 as argv[1, 2, 3 .]. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
