When you write "Unix" do mean a particular set of Unix implementations, or do you mean that certification by The Open Group <http://www.opengroup.org/> requires it? If the later, shouldn't there be an APAR on this?
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@listserv.ua.edu> on behalf of Thomas David Rivers <riv...@dignus.com> Sent: Tuesday, March 13, 2018 11:33 AM To: IBM-MAIN@listserv.ua.edu Subject: Re: USS assembler program and envars Frank Chu wrote: > Hi, > > Does anybody know if there is a control block chain that I can walk to > find all of the envars that are define? I know there is a LE C > function that can query for a specified envar but I can't use LE C. > And there are circumstances where I do not have access to the parm > list pointer that is passed to the executing program, so I can't rely > on that guy to find the envars. I've also gone through the USS > Callable Assembler Services Guide and it doesn't look like there is a > service for this either. > > Thanks in advance. > Frank > Just FYI - in a UNIX environment the address of the incoming environment variable array is stuffed away in an external variable named "environ": extern char **environ; The Dignus C runtime (also non-LE) makes that available... basically at the start-up of an exec'd program you have to copy the incoming variables into a blob of memory and point 'environ' to the blob... (because the format from IBM doesn't match the UNIXy way of doing it.) Then, your program can merrily reference 'environ' (getenv/setenv, etc... also just reference 'environ'.) If you are a non-LE program that has been exec'd; you probably want to take the same approach and make those copies when you start execution; then provide functions that can reference the copies (e.g. your own getenv/setenv functions.) There is no "magic" to these environment variables - they are simply passed on the exec() call... that's how they pass from parent-to-child in the UNIX environmnt. No need for a defined location beyond the per-program copy (and that copy is up to the program.) - Dave R. - -- riv...@dignus.com Work: (919) 676-0847 Get your mainframe programming tools at http://secure-web.cisco.com/1yv1SBdrUxM_Et9wyycsLgdZSNj8tm0S1ueixX8COmlgQ952gVClA4cAebBGU-DHHGU6IbHUM0UOIt7zxQvGStv26OAGg76O5hrGMxgnryQLoDWUXIzQEUEN5BPUJt9oSrGawSWUV2cLvTaL24xYAT24IQPlRoZ3IJuhRikp_UHJI4dUijGAz7KV7kuM6Idh22HGogg-dvMrT9kE5Q_fvkiQPPDXsF0Ft1Rs1ipL9kt2H5CJcdjo69EvWiAqjvU4oDSW3RyVlca5pwIRVCDXDcdDhZJZLSF-F7acuBdpyQNMEViXE9V3PzE3PirU5BkR84kn0jQ1CFwdQ2wItRRhobAhCLIAV4SPz57nzIklS2tsOoJHBlQpUKKNAkjlAEpDXMDBkAZX2sXQSAOfRa5ec3PGwfkYn2k1Z_jZGfY-6kbninNGr6ArS9eCDHvPaLHSx/http%3A%2F%2Fwww.dignus.com ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
