#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>

int main()
{
  int inf, r;
  inf = open("pp.txt", O_RDONLY);
  if (inf < 0)
  { perror("open");
    exit(1); }
  while (1)
  { char c[1024];
    r = read(inf, c, 1024);
    if (r < 0)
    { perror("read");
      exit(1); }
    if (r == 0)
      break;
    r = write(1, c, r);
    if (r < 0)
    { perror("write");
      exit(1); } }
  close(inf); }