#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/mman.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdint.h>

struct Item {
    int value;
    uint32_t next_pointer;
};

int main(int argc, char *argv[]) {
    char *file_name = argv[1];
    int fd = open(file_name, O_RDONLY);

    struct Item item;
    struct stat st;
    fstat(fd, &st);
    char *contents = mmap(NULL,
                          st.st_size,
                          PROT_READ,
                          MAP_PRIVATE,
                          fd,
                          0);
    size_t len = st.st_size;
    uint32_t entry = 0;

    memcpy(&item, contents, sizeof(item));
    while (item.next_pointer != 0) {
        printf("%d ", item.value);
        entry = item.next_pointer;
        memcpy(&item, contents + entry, sizeof(item));
    }
    printf("%d ", item.value);

    munmap(contents, st.st_size);
finally:
    close(fd);
    return 0;
}