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

static char buf[8192];

int
main (int argc, char **argv)
{
  const char *file = argc > 1 ? argv[1] : "/proc/stat";
  while (1)
    {
      int fd = open (file, O_RDONLY);
      while (read (fd, buf, 8192) > 0);
      close (fd);
      usleep (300000);
    }
}