Print the current job stack

Here's an example of printing the current stack of your job stream. It will
print the names of all the programs at seclvl 30 and below, but will fail at
seclvl 40+

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <mih/micommon.h>
#include <mih/miinvcom.h>
#include <mimchobs.h>
#include <mih/matsobj.h>

#pragma linkage( _MATINVS1, builtin )
#pragma linkage( _MATINVS2, builtin )

typedef _Packed struct _MATINVS_T
{
    int            bytes_prov;    /* user provided bytes            */
    int            bytes_avail;   /* available bytes                */
    int            num_of_invs;   /* number of invocations in stack */
    int            mark_counter;  /* relative from mark             */
    /* Invocation entires sizeof(_MATINVS_ENTRY_T) * num_of_invs */
} _MATINVS_T;

typedef _Packed struct _MATINVS_ENTRY_T
{
    char           reserved1[32];
    char           assc_pgm_ptr[16];  /* Associated Program Pointer */
    short int      inv_num;       /* Invocation Number          */
    char           inv_mech;      /* Invocation Mechanism       */
    char           inv_type;      /* Invocation Type            */
    int            inv_mark;      /* Invocation Mark            */
    int            instr_id;      /* Instruction Identifier     */
    int            actgrp_mark;   /* Activation Group Mark      */
    _SUSPENDPTR    susp_ptr;      /* Suspend Pointer            */
    char           reserverd2[48];
} _MATINVS_ENTRY_T;

#define _MEM_TO_ALLOC  ( sizeof(_MATINVS_T) + ( sizeof(_MATINVS_ENTRY_T) *
show_stack_header->num_of_invs) )
#define _START_OF_ENTRIES ( sizeof(_MATINVS_T) )

void _MATINVS1(_MATINVS_T *, _SYSPTR);
void _MATINVS2(_MATINVS_T *);

int main(void)
{
  int                 counter;
  _MATINVS_T          *show_stack_header;
  char                *pos_ptr;
  _MATINVS_ENTRY_T    *stack_entry;

    show_stack_header = (_MATINVS_T *)malloc( sizeof(_MATINVS_T) );
    show_stack_header->bytes_prov = sizeof(_MATINVS_T);

    _MATINVS2(show_stack_header);

    show_stack_header = (_MATINVS_T *)realloc(show_stack_header,
_MEM_TO_ALLOC);
    show_stack_header->bytes_prov = _MEM_TO_ALLOC;

    _MATINVS2(show_stack_header);

    pos_ptr = (char *)show_stack_header;
    pos_ptr += sizeof(_MATINVS_T);

    for (counter = 0; counter < show_stack_header->num_of_invs; counter++)
    {
        stack_entry = (_MATINVS_ENTRY_T *)pos_ptr;
        printf("Program = %s\n", stack_entry->assc_pgm_ptr);
        pos_ptr += sizeof(_MATINVS_ENTRY_T);
    }

    return 0;
}


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