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

int
main(int argc, char *argv[]) {
  int c;
  
  if(!freopen(argv[1], "r", stdin)) {
    printf("can't open %s", argv[1]);
    exit(1);
  }
  for(;;) {
    sleep(3);
    while((c = fgetc(stdin)) != EOF) {
      if(fputc(c, stdout) == EOF) {
        printf("error write");
        exit(1);
      }
    }
    if(ferror(stdin)) {
      printf("error read");
      exit(1);
    }
    fflush(stdout);
  }
}