struct itimerval *new;
const struct itimerval *new;
__setitimer (which, new, old)     enum __itimer_which which;     struct itimerval *new;     struct itimerval *old;{  if (new == NULL)    {      __set_errno (EINVAL);      return -1;    }  __set_errno (ENOSYS);  return -1;}