#include <sys/stat.h>
#include <stdlib.h>
#include <stdio.h>
#include "memfd.h"
#include <errno.h>
#include <stdio.h>

#define errExit(msg)    do { perror(msg); exit(EXIT_FAILURE); \
} while (0)

int main(int argc, char *argv[])
{
  ssize_t i, len;
  unsigned char* paddr;
  struct stat st;
  pid_t pid = 0;
  int fd = 0;
  int ret = 0;

  if (argc != 3) {
    fprintf(stderr, "%s PID FD\n", argv[0]);
    exit(EXIT_FAILURE);
  }

  pid = atol(argv[1]);
  fd = atol(argv[2]);

  fd = basic_shm_open(fd, pid, 1);
  if (fd <= 0)
  {
    errExit("basic_shm_open");
  }


  if (fstat (fd, &st))
    errExit ("fstat");


  len = st.st_size;

  printf("length: %zu, atime: %lu.%lu\n", len, st.st_atim.tv_sec, st.st_atim.tv_nsec);

  ret =  basic_shm_mmap(fd, &paddr);
  if (ret < 0)
    errExit("basic_shm_mmap");

  printf ("start: ");
  for (i = 0; i < 32; ++i)
    printf ("%i ", paddr[i]);
  printf ("\nend: ");
  for (i = 0; i < 32; ++i)
    printf ("%i ", paddr[len-32+i]);
  printf ("\ndone\n");

  ret =  basic_shm_unmmap(fd, &paddr);
  if (ret < 0)
    errExit("basic_shm_unmmap");
    
  basic_shm_close(fd);

  pause();

  exit(EXIT_SUCCESS);
}