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

const int fdstdin = 0, fdstdout = 1;

void main()
{ int oldstate = fcntl(fdstdin, F_GETFL, 0);
  fcntl(fdstdin, F_SETFL, oldstate | O_NONBLOCK);
  while (1)
  { char line[1000];
    int n = read(fdstdin, line, 999);
    if (n>0)
      write(fdstdout, line, n);
    else
    { write(fdstdout, ".", 1);
      usleep(500000); } }
   fcntl(fdstdin, F_SETFL, oldstate);
 }