int chitcpd_tcp_state_handle_FIN_WAIT_2(serverinfo_t *si, chisocketentry_t *entry, tcp_event_type_t event) {
tcp_data_t *data = &entry->socket_state.active.tcp_data;
if (event == PACKET_ARRIVAL) {
while (!list_empty(&data->pending_packets) && circular_buffer_available(&data->recv)) {
pthread_mutex_lock(&data->lock_pending_packets);
tcp_packet_t *pack = list_fetch(&(data->pending_packets));
pthread_mutex_unlock(&data->lock_pending_packets);
tcphdr_t *head = TCP_PACKET_HEADER(pack);
if (!acceptability_test(data, pack)) {
send_ACK(si, entry, data);
chitcp_tcp_packet_free(pack);
return CHITCP_OK;
}
if (head->ack) {
if (inside_window(data, pack))
update_WND_and_UNA(data, pack);
if (TCP_PAYLOAD_LEN(pack))
use_data(si, entry, data, pack);
if (head->fin) {
always_on_fb(si, entry, data, pack);
chitcpd_update_tcp_state(si, entry, TIME_WAIT);
}
}
chitcp_tcp_packet_free(pack);
}
} else
chilog(WARNING, "In FIN_WAIT_2 state, received unexpected event (%i).", event);
return CHITCP_OK;
}
void reader(void)
{
int item;
while(1 == 1) {
down(&mutex);
rc = rc + 1;
if (rc == 1) down(&db);
up(&mutex);
item = read_data_base();
down(&mutex);
rc = rc - 1;
if (rc == 0) up(&db);
up(&mutex);
use_data(item);
}
}
int chitcpd_tcp_state_handle_ESTABLISHED(serverinfo_t *si, chisocketentry_t *entry, tcp_event_type_t event){
tcp_data_t *data = &entry->socket_state.active.tcp_data;
if (event == APPLICATION_SEND) {
send_all(si,entry,data);
} else if (event == PACKET_ARRIVAL) {
while (!list_empty(&data->pending_packets) && circular_buffer_available(&data->recv)){
pthread_mutex_lock(&data->lock_pending_packets);
tcp_packet_t *pack = list_fetch(&(data->pending_packets));
pthread_mutex_unlock(&data->lock_pending_packets);
tcphdr_t * head = TCP_PACKET_HEADER(pack);
if (!acceptability_test(data, pack)) {
send_ACK(si, entry, data);
chitcp_tcp_packet_free(pack);
return CHITCP_OK;
}
if (!head->syn && head->ack) {
if (inside_window(data, pack))
update_WND_and_UNA(data, pack);
if (TCP_PAYLOAD_LEN(pack))
use_data(si, entry, data, pack);
if (head->fin){
always_on_fb(si, entry, data, pack);
chitcpd_update_tcp_state(si, entry, CLOSE_WAIT);
}
}
chitcp_tcp_packet_free(pack);
}
} else if (event == APPLICATION_RECEIVE){
data->RCV_WND = circular_buffer_available(&data->recv);
} else if (event == APPLICATION_CLOSE){
send_all(si,entry,data);
tcp_packet_t *new_pack = (tcp_packet_t*)malloc(sizeof(tcp_packet_t));
chitcpd_tcp_packet_create(entry,new_pack,NULL,0);
tcphdr_t *FIN = TCP_PACKET_HEADER(new_pack);
FIN->seq = chitcp_htonl(data->SND_NXT);
FIN->ack_seq = chitcp_htonl(data->RCV_NXT);
FIN->fin = 1;
FIN->win = chitcp_htons(data->RCV_WND);
chilog_tcp(CRITICAL,new_pack,LOG_OUTBOUND);
chitcpd_send_tcp_packet(si,entry,new_pack);
circular_buffer_close(&data->recv);
circular_buffer_close(&data->send);
chitcpd_update_tcp_state(si,entry,FIN_WAIT_1);
chitcp_tcp_packet_free(new_pack);
}
else
chilog(WARNING, "In ESTABLISHED state, received unexpected event (%i).", event);
return CHITCP_OK;
}
