// Send pending ACKs back to sender for packets already received
void send_pending_acks()
{
if (!invalidated())
{
while (!xmit_acks.empty())
{
ack_send_buf.frame_prepare(*frame_, Frame::WRITE_ACK_STANDALONE);
// encapsulate standalone ACK
generate_ack(ack_send_buf);
// transmit it
net_send(ack_send_buf, NET_SEND_ACK);
}
}
}
/* when need to send an ack pakcet, invoke the function */
void send_ack_packet(int ack_num, bt_config_t* config, bt_peer_t* toPeer) {
int len;
/* ack_num == 0 means duplicate data packet */
if (ack_num == 0)
return;
DPRINTF(DEBUG_SOCKETS, "send ack packet: %d\n", ack_num-1);
/* generate ack packet */
char* packet = generate_ack(ack_num, &len);
/* send ack packet */
send_packet(config->sock, packet, len, 0, (struct sockaddr *)&toPeer->addr,
sizeof(toPeer->addr));
free(packet);
/* reset timer */
set_connection_timeout(toPeer->down_con, CONNECTION_TIMEOUT, 0);
}
