#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
 
void main()
{
  char buf[8192];
  int rr;
 
  fcntl(STDERR_FILENO,F_SETFL,O_NONBLOCK);
  while ( (rr = read(STDIN_FILENO,buf,8192)) > 0) {
    write(STDOUT_FILENO,buf,rr);
  }
  if (rr < 0) {
    perror("read error:");
    exit(1);
  }
  exit(0);
}