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From: SPW2562@RITVAXC.BITNET
Newsgroups: mod.computers.vax
Subject: Need Help with VAX/VMS C
Message-ID: <8602200928.AA12076@ucbvax.berkeley.edu>
Date: Thu, 20-Feb-86 04:29:08 EST
Article-I.D.: ucbvax.8602200928.AA12076
Posted: Thu Feb 20 04:29:08 1986
Date-Received: Thu, 20-Feb-86 23:22:44 EST
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        I've been trying to write a C program on our VAX/VMS system here at
        RIT, but have been running into some trouble.  The program is run
        from my LOGIN.COM to assign symbol names, and delete some symbols
        I don't want defined.  The assigning part works fine, but when the
        program tries deleting symols, the following occurs:

Access violation, reason mask=01, virtual address=7473B3C2, PC=00016831, PSL=03C
00000
Symbolic stack dump follows
module name     routine name                     line       rel PC    abs PC

                                                           00016831  00016831
                                                           00016502  00016502
LOGIN           main                               29      0000017A  0000077A

        Being a Unix* hack, I have no idea what this means.  (And people
        complain about Unix* error messages being cryptic.  I understand
        Unix* error messages far better than I'll ever understand this
        stuff.)  The offening line and surrounding code are here:

   ...
   lib$set_symbol("COL*OR", "WRITE SYS$OUTPUT \"\27[2J\27[H\"", tab);
   lib$set_symbol("CL*EAR", "WRITE SYS$OUTPUT \"\27[0;41;33m\27[A\"", tab);
=> lib$delete_symbol("ONE", tab);
   lib$delete_symbol("LOGOUT", tab);
   max=strlen(name)-14;
   ...

        I've run it with 'tab' as an int with value 2, and with 'tab'
        #define'd as 2, and it makes no difference.  When this function
        is called from a basic program it works fine.  Can anyone tell me
        why this is happening, and how I can correct it?
        Please respond directly to either of the below two addresses,
        as I do not subscribe to this mailing list.

*UNIX is a trademark of Bell Labs.
==============================================================================
        Steve Wall @ Rochester Institute of Technology
        Usenet: ..!rochester!ritcv!spw2562        (Fishhook)   Unix 4.2 BSD
        BITNET: SPW2562@RITVAXC                   (Snoopy)     VAX/VMS 4.2