#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <inttypes.h>
#include <stdint.h>

#define MEGABYTE 1024*1024

static uint64_t getTotalSystemMemory()
{
    long pages = sysconf(_SC_AVPHYS_PAGES);
    long page_size = sysconf(_SC_PAGE_SIZE);
    return pages * page_size / MEGABYTE;
}

int main(int argc, char *argv[])
{
    void *myblock = NULL;
    int count = 0;

    while (1)
    {
        myblock = (void *) malloc(MEGABYTE);
        if (!myblock) break;
        printf("Currently allocating %d MB\n", ++count);
        printf("Free memory: %" PRId64 " MB\n", getTotalSystemMemory());
        nanosleep(1000 * 1000 * 2);
    }

    return 0;
}