aiowait
resultp = aiowait(block ? NULL : &zero_wait);
error = aiowait((struct timeval *)a1, (int)a2, &rval);
error = aiowait((struct timeval *)uap[1], (int)uap[2],
static int aiowait(struct timeval *, int, long *);
extern aio_result_t *aiowait(struct timeval *);