How to get Memory information from QNX using c program?

Question

I have written a code which perfectly works on Ubuntu . But getting unexpected behavior on QNX .

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <unistd.h>

int main( void )
  {

    printf( "Total Memory  = %ld MB\n",
    (sysconf(_SC_PHYS_PAGES)* sysconf(_SC_PAGESIZE))/1048576);

    printf("Getting available memory...\n");
    printf( "Available     = %ld MB\n",
    (sysconf(_SC_AVPHYS_PAGES)* sysconf(_SC_PAGESIZE))/1048576);

    printf("Getting used memory...\n");
    printf( "Used Memory   = %ld MB\n",((sysconf(_SC_PHYS_PAGES) - 
    sysconf(_SC_AVPHYS_PAGES))* sysconf(_SC_PAGESIZE))/1048576);

    return EXIT_SUCCESS;
}

This perfectly works fine on Ubuntu but not on QNX . Is there any different way out to do this ?

Output :

     Total Memory = - 3906 MB

     Available    = - 3096 MB

     Used Memory  =  0 MB

Answer 1

After investing lot of time i got a way i could do it.

Using:

Showmem -S

To execute this command from c Programming Language use pipe

FILE *fp;
pf = popen(command,"r"); 

Then you can grab the data from fp.