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

struct list {
  char data[500];
  off_t next;
};

int main(int argc, char *argv[argc+1]) {
  size_t len = 100 << 20;
  int fd = open(argv[1], O_RDONLY);
  if (fd == -1) {
    perror("open");
    return EXIT_FAILURE;
  }
  void *base = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
  if (base == MAP_FAILED) {
    perror("mmap");
    return EXIT_FAILURE;
  }
  struct list *item = base;
  while (item->next) {
    printf("%s\n", item->data);
    printf("next is %p\n", item->next);
    item = base + item->next; 
  }
  printf("LAST %s\n", item->data);
}