hv_get_bytes_to_read
ret = sprintf(buf, "%u\n", hv_get_bytes_to_read(rbi));
aread = hv_get_bytes_to_read(&chn->inbound);
aread = hv_get_bytes_to_read(&chn->outbound);
return hv_get_bytes_to_read(rbi);
u32 readable = hv_get_bytes_to_read(&chan->inbound);
u32 readable = hv_get_bytes_to_read(&chan->inbound);