Re: Newbie C++ on HP NonStop - how to integrate Guardian Procedures?

From:
"Alf P. Steinbach" <alfps@start.no>
Newsgroups:
comp.lang.c++
Date:
Wed, 18 Mar 2009 16:15:32 +0100
Message-ID:
<gpr36o$lf6$1@news.motzarella.org>
* Greg Shaw:

Hi there! This is my first post, so hello everybody. I've been banging
my head against the wall writing my first C++ program which calls a
Guardian Procedure, on a HP NonStop (Tandem) machine. I have RTFM good
and hard with no success, tried various syntax blags, and asked around
at my place of work, and no-one can help, so I thought I'd ask you
lot. And yes, I have tried running it in debug using INSPECT, but when
trying to STEP IN to the call to the Guardian procedure, the source is
not available so I can't follow what's going on.


I'm not familiar with any of the tools or APIs you're using.

They don't matter though.

The task I set myself was the most basic one - wrap up in C++ a nice
safe Guardian procedure which can't do any damage. I chose
PROCESS_GETINFO_ . I ended up putting loads of cout statements at the
end of the program just so I can see everything - a more useful
version would be supplying So, can anyone tell me why the program
below results in this response (return code 2 is Parameter error) from
the NonStop, please?

returnCode is 2
processHandle is 8003de8
*processHandle is 0
errorDetail is 8003e08
*errorDetail is 1


No. That's to do with the internals of PROCESS_GETINFO_, and nothing to do with
C++. I.e., it's off-topic.

============================================
// process_getinfo_.cpp
//
// A first attempt to write C++ which calls a Guardian procedure.

// inclusion guard:
#ifndef MY_PROCESS_GETINFO
#define MY_PROCESS_GETINFO


You don't need include guards for a main program or other implementation file.

Include guarads are used for header files.

// Begin
#include < cextdecs(PROCESS_GETINFO_)>


Are you sure that 'cextdecs' is a macro that expands to a header file name?

Anyway I'm not sure of the syntax here.

Macros as header names is a very seldom used feature.

#include <iostream>
using std::cout;
using std::endl;

int main()
{
    short returnCode=0;
    short *processHandle = new short[10];

Here you should just use std::vector, i.e.,

   std::vector<short> processHandle( 10 );

You then need to

   #include <vector>

among the other includes.

     for (int i = 0; i<10 ; i++ )
    {
        processHandle[i] = '\0';

Presumably process handles are not characters.

Anyway this zeroing loop is unnecessary when using std::vector.

     }
    short *errorDetail = new short[1];

Here you can just use

    short errorDetail;

and that's that.

     errorDetail[0] = '\0';
    cout << "\nHello. This is designed to use C++ to call the" << endl;
    cout << "Guardian procedure PROCESS_GETINFO_ with no processhandle"
<< endl;
    cout << "argument - so designed to return the processhandle of the"
<< endl;
    cout << "caller, plus any error information. Good luck...." << endl;

  returnCode = PROCESS_GETINFO_ (processHandle // [ short *processhandle ] /*i,o 1 */
                                               ,// [ char *proc-fname ] /* o 2 */
                                               ,// [ short maxlen ] / * o 2 */
                                               ,// [ short *proc-fname-len ] /* o 3 */
                                               ,// [ short *priority ] /* i 4 */
                                               ,// [ short *mom?s-processhandle ] /*i 5 */
                                               ,// [ char *hometerm ] /* i 6 */
                                               ,// [ short maxlen ] / * i 6 */
                                               ,// [ short *hometerm-len ] /* i 7 */
                                               ,// [ long long *process-time ]/* i 8 */
                                               ,// [ short *creator- access-id ]/*i 9 */
                                               ,// [ short *process- access-id ]/*i 10 */
                                               ,// [ short *gmom?s- processhandle ]/* i11 */
                                               ,// [ short *jobid ] / * i 12 */
                                               ,// [ char *program- file ] /* i 13 */
                                               ,// [ short maxlen ] / * i 13 */
                                               ,// [ short *program- len ] /* i 14 */
                                               ,// [ char *swap- file ] /* i 15 */
                                               ,// [ short maxlen ] / * i 15 */
                                               ,// [ short *swap- len ] /* i 16 */
                                , errorDetail // [ short *error- detail ] /* i 17 */
                                               ,// [ short *proc- type ] /* i 18 */
                                               ,// [ __int32_t *oss- pid ] /* i 19*/;
                                               );


C++ does not have default arguments.

I can't think of any definition of PROCESS_GETINFO_ where the above would compile.

Cheers & hth.,

- Alf

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