Mine

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <errno.h>

#define I_4M 4194304

int main(int argc, char *argv[])
{
    char gc;
    long i;

    i=0;
    while(errno == 0){
        printf("%i bytes gemapped\n", i*I_4M);
        getchar();
        mmap((caddr_t)0, I_4M, PROT_WRITE|PROT_READ, MAP_PRIVATE|MAP_ANON, \
                                                -1, 0);
        i++;
    }
    perror("Stopped");
    printf("%i bytes gemapped. einde\n", i*I_4M);
    pause();
}