void handle_timedout_frames(Sender * sender,
LLnode ** outgoing_frames_head_ptr)
{
//TODO: Suggested steps for handling timed out datagrams
// 1) Iterate through the sliding window protocol information you maintain for each receiver
// 2) Locate frames that are timed out and add them to the outgoing frames
// 3) Update the next timeout field on the outgoing frames
int i = 0;
struct timeval *time = malloc(sizeof(struct timeval));
gettimeofday(time, NULL);
for (;i < SWS; i++) {
if (sender->sendQ[i].inuse == 1) {
long timediff = timeval_usecdiff(time, sender->sendQ[i].timeout);
if (timediff < 0) {
Frame * outgoing_frame = (Frame *) sender->sendQ[i].msg;
char * outgoing_msg = convert_frame_to_char(outgoing_frame);
//fprintf(stderr, "%d frame timing out\n", outgoing_frame->seqNum);
append_crc(outgoing_msg,MAX_FRAME_SIZE);
ll_append_node(outgoing_frames_head_ptr, outgoing_msg);
setTimeOutTime(sender->sendQ[i].timeout);
//free(outgoing_frame);
}
}
}
}
//Splits long message into smaller messages that fit into frames
void ll_split_head(LLnode ** head_ptr, int payload_size)
{
if(head_ptr == NULL || *head_ptr == NULL)
return;
//Get the message from the head of the linked list
LLnode * head = *head_ptr;
Cmd* head_cmd = (Cmd*) head->value;
char* msg = head_cmd->message;
//Do not need to split
if(strlen(msg) < payload_size)
return;
//Actual message splitting part
int i;
for(i = payload_size; i < strlen(msg); i+= payload_size)
{
Cmd* next_cmd = (Cmd*) malloc(sizeof(Cmd));
next_cmd->message = (char *) malloc((payload_size+1)*sizeof(char));
memset(next_cmd->message, 0, (payload_size+1)*sizeof(char));
strncpy(next_cmd->message, msg + i, payload_size*sizeof(char));
next_cmd->src_id = head_cmd->src_id;
next_cmd->dst_id = head_cmd->dst_id;
ll_append_node(head_ptr, next_cmd);
}
//Cut off the first message with null character
head_cmd->message[payload_size] = '\0';
}
void handle_timedout_frames(Sender * sender,
LLnode ** outgoing_frames_head_ptr)
{
//TODO: Suggested steps for handling timed out datagrams
// 1) Iterate through the sliding window protocol information you maintain for each receiver
// 2) Locate frames that are timed out and add them to the outgoing frames
// 3) Update the next timeout field on the outgoing frames
//
struct timeval now;
struct timeval tmp;
long long interval;
if (sender->fin == 2)
{
return;
}
if (sender->fin == 1)
{
}
//find the timeout and send out
int pos;
int seq;
gettimeofday(&now, NULL);
for (seq = (sender->LAR + 1); seq <= sender->LFS; seq++)
{
//seq = sender->LAR + 1;
pos = seq % sender->SWS;
tmp = sender->timestamp[pos];
interval = (now.tv_sec - tmp.tv_sec) * 1000000
+ (now.tv_usec - tmp.tv_usec);
//if (interval < 100000)
if (interval < 50000)
return;
fprintf(stderr, "sender:timeout!seq=%d\n",seq);
fprintf(stderr, "sender,%ld:%ld\n", now.tv_sec, now.tv_usec);
fprintf(stderr, "sender,%ld:%ld\n", tmp.tv_sec, tmp.tv_usec);
Frame* outgoing_frame;
outgoing_frame = (Frame*)sender->buffer[pos];
sender->timestamp[pos] = now;
//char * buf = convert_frame_to_char(outgoing_frame);
//outgoing_frame->checksum = chksum((unsigned short*) buf,
// MAX_FRAME_SIZE / 2);
//buf = convert_frame_to_char(outgoing_frame);
char* buf = add_chksum(outgoing_frame);
char* outgoing_charbuf = buf;
print_frame(outgoing_frame);
ll_append_node(outgoing_frames_head_ptr,
outgoing_charbuf);
}
}
void handle_incoming_msgs(Receiver * receiver,
LLnode ** outgoing_frames_head_ptr)
{
//TODO: Suggested steps for handling incoming frames
// 1) Dequeue the Frame from the sender->input_framelist_head
// 2) Convert the char * buffer to a Frame data type
// 3) Check whether the frame is corrupted
// 4) Check whether the frame is for this receiver
// 5) Do sliding window protocol for sender/receiver pair
int incoming_msgs_length = ll_get_length(receiver->input_framelist_head);
while (incoming_msgs_length > 0)
{
//Pop a node off the front of the link list and update the count
LLnode * ll_inmsg_node = ll_pop_node(&receiver->input_framelist_head);
incoming_msgs_length = ll_get_length(receiver->input_framelist_head);
//DUMMY CODE: Print the raw_char_buf
//NOTE: You should not blindly print messages!
// Ask yourself: Is this message really for me?
// Is this message corrupted?
// Is this an old, retransmitted message?
char * raw_char_buf = (char *) ll_inmsg_node->value;
if (chksum_all(raw_char_buf))
{
fprintf(stderr, "chksum error\n");
free(raw_char_buf);
free(ll_inmsg_node);
continue;
}
Frame * inframe = convert_char_to_frame(raw_char_buf);
if (inframe->src == receiver->send_id)
{
if (inframe->dst == receiver->recv_id)
{
Frame * outframe;
char* buf;
outframe = build_ack(receiver, inframe);
buf = add_chksum(outframe);
print_receiver(receiver);
ll_append_node(outgoing_frames_head_ptr, buf);
free(outframe);
}
}
//free(inframe);
free(raw_char_buf);
free(ll_inmsg_node);
}
}
void handle_timedout_frames(Sender * sender,
LLnode ** outgoing_frames_head_ptr)
{
//Iterate through the send queue
int i;
for(i=0; i < glb_receivers_array_length; i++)
{
send_Q ** curr_node = sender->send_q_head[i];
int lar = sender->LAR[i];
int lfs = sender->LFS[i];
while(lar != lfs)
{
lar = (lar + 1) % (MAX_SEQ_NUM + 1);
send_Q * curr = curr_node[lar%WS];
Frame * sent_frame = curr->frame;
struct timeval * tv = curr->frame_timeout;
struct timeval now;
gettimeofday(&now, NULL);
//A frame with set timeout is found
if(tv != NULL)
{
//Update timeout field for old, timed out frames
if(timeval_usecdiff(tv, &now) > 0)
{
fprintf(stderr, "TIMEDOUT DATA %s being resent\n", sent_frame->data);
char * outframe_char_buf = convert_frame_to_char(sent_frame);
ll_append_node(outgoing_frames_head_ptr, outframe_char_buf);
calculate_timeout(curr->frame_timeout);
}
}
//Update timeout field for fresh outgoing frames
if(tv == NULL && sent_frame != NULL)
{
fprintf(stderr, "FRESH DATA %s being sent\n", sent_frame->data);
curr->frame_timeout = (struct timeval *) malloc(sizeof(struct timeval));
calculate_timeout(curr->frame_timeout);
}
}
}
}
void handle_incoming_msgs(Receiver *r, LLnode **output_framelist_head) {
while( ll_get_length(r->input_framelist_head) > 0 ) {
LLnode *msgNode = ll_pop_node(&r->input_framelist_head);
char *raw_buf = (char *)msgNode->value;
Frame *inframe = convert_char_to_frame(raw_buf);
// If corrupted, drop this frame
if( !(crc32(inframe, 4+FRAME_PAYLOAD_SIZE) ^ inframe->crc) ) {
// if not the right recipient, drop this frame
if( r->recv_id == inframe->dst ) {
printf("<RECV_%d>:[%s]\n", r->recv_id, inframe->data);
char *ack_buf = (char *)malloc(MAX_FRAME_SIZE);
memcpy(ack_buf, raw_buf, MAX_FRAME_SIZE);
ack_buf[3] = ACK_FLAG;
ll_append_node(output_framelist_head, ack_buf);
}
}
free(msgNode);
free(raw_buf);
free(inframe);
}
}
void *run_stdinthread(void *threadid)
{
fd_set read_fds, master_fds;
int fd_max;
int select_res;
int sender_id;
int receiver_id;
int sscanf_res;
size_t input_buffer_size = (size_t) DEFAULT_INPUT_BUFFER_SIZE;
char *input_buffer;
char *input_message;
int input_bytes_read;
char input_command[MAX_COMMAND_LENGTH];
Sender *sender;
//Zero out fd_sets
FD_ZERO(&read_fds);
FD_ZERO(&master_fds);
//Add standard input to the fd_set
FD_SET(STDIN_FILENO, &master_fds);
fd_max = STDIN_FILENO;
while (1) {
//Copy the master set to avoid permanently altering the master set
read_fds = master_fds;
if ((select_res = select(fd_max + 1,
&read_fds,
NULL,
NULL,
NULL)) == -1) {
perror("Select failed - exiting program");
pthread_exit(NULL);
}
//User inputted a string, read in input and prepare to send
if (FD_ISSET(STDIN_FILENO, &read_fds)) {
input_buffer = (char *) malloc(input_buffer_size * sizeof(char));
//NULL set the entire input buffer
memset(input_buffer,
0,
input_buffer_size * sizeof(char));
//Read in the command line into the input buffer
input_bytes_read = getline(&input_buffer, &input_buffer_size, stdin);
//Zero out the readin buffers for the command
memset(input_command,
0,
MAX_COMMAND_LENGTH * sizeof(char));
//Zero out the memory for the message to communicate
input_message = (char *) malloc((input_bytes_read + 1) * sizeof(char));
memset(input_message,
0,
(input_bytes_read + 1) * sizeof(char));
//Scan the input for the arguments
sscanf_res = sscanf(input_buffer,
"%s %d %d %[^\n]",
input_command,
&sender_id,
&receiver_id,
input_message);
//Number of parsed objects is less than expected
if (sscanf_res < 4) {
if (strcmp(input_command, "exit") == 0) {
free(input_message);
free(input_buffer);
return 0;
} else {
fprintf(stderr, "Command is ill-formatted\n");
}
} else {
if (strcmp(input_command, "msg") == 0) {
//Check to ensure that the sender and receiver ids are in the right range
if (sender_id >= glb_senders_array_length ||
sender_id < 0) {
fprintf(stderr, "Sender id is invalid\n");
}
if (receiver_id >= glb_receivers_array_length ||
receiver_id < 0) {
fprintf(stderr, "Receiver id is invalid\n");
}
//Only add if valid
if (sender_id < glb_senders_array_length &&
receiver_id < glb_receivers_array_length &&
sender_id >= 0 &&
receiver_id >= 0) {
//Add the message to the receive buffer for the appropriate thread
Cmd *outgoing_cmd = (Cmd *) malloc(sizeof(Cmd));
char *outgoing_msg = (char *) malloc(sizeof(char) * (strlen(input_message) + 1));
//Copy out the input message into the outgoing command object
strcpy(outgoing_msg,
input_message);
outgoing_cmd->src_id = sender_id;
outgoing_cmd->dst_id = receiver_id;
outgoing_cmd->message = outgoing_msg;
//Add it to the appropriate input buffer
sender = &glb_senders_array[sender_id];
//Lock the buffer, add to the input list, and signal the thread
pthread_mutex_lock(&sender->buffer_mutex);
ll_append_node(&sender->input_cmdlist_head,
(void *) outgoing_cmd);
pthread_cond_signal(&sender->buffer_cv);
pthread_mutex_unlock(&sender->buffer_mutex);
}
} else {
fprintf(stderr, "Unknown command:%s\n", input_buffer);
}
}
//Lastly, free the input_buffer and the input_message
free(input_buffer);
free(input_message);
}
}
pthread_exit(NULL);
}
//*********************************************************************
//NOTE: We will overwrite this file, so whatever changes you put here
// WILL NOT persist
//*********************************************************************
void send_frame(char * char_buffer,
enum SendFrame_DstType dst_type)
{
int i = 0, j;
char * per_recv_char_buffer;
//Multiply out the probabilities to some degree of precision
int prob_prec = 1000;
int drop_prob = (int) prob_prec * glb_sysconfig.drop_prob;
int corrupt_prob = (int) prob_prec * glb_sysconfig.corrupt_prob;
int num_corrupt_bits = CORRUPTION_BITS;
int corrupt_indices[num_corrupt_bits];
//Pick a random number
int random_num = rand() % prob_prec;
int random_index;
//Drop the packet on the floor
if (random_num < drop_prob)
{
free(char_buffer);
return;
}
//Determine whether to corrupt bits
random_num = rand() % prob_prec;
if (random_num < corrupt_prob)
{
//Pick random indices to corrupt
for (i=0;
i < num_corrupt_bits;
i++)
{
random_index = rand() % MAX_FRAME_SIZE;
corrupt_indices[i] = random_index;
}
}
//Determine the array size of the destination objects
int array_length = 0;
if (dst_type == ReceiverDst)
{
array_length = glb_receivers_array_length;
}
else if (dst_type == SenderDst)
{
array_length = glb_senders_array_length;
}
//Go through the dst array and add the packet to their receive queues
for (i=0;
i < array_length;
i++)
{
//Allocate a per receiver char buffer for the message
per_recv_char_buffer = (char *) malloc(sizeof(char) * MAX_FRAME_SIZE);
memcpy(per_recv_char_buffer,
char_buffer,
MAX_FRAME_SIZE);
//Corrupt the bits (inefficient, should just corrupt one copy and memcpy it
if (random_num < corrupt_prob)
{
//Corrupt bits at the chosen random indices
for (j=0;
j < num_corrupt_bits;
j++)
{
random_index = corrupt_indices[j];
per_recv_char_buffer[random_index] = ~per_recv_char_buffer[random_index];
}
}
if (dst_type == ReceiverDst)
{
Receiver * dst = &glb_receivers_array[i];
pthread_mutex_lock(&dst->buffer_mutex);
ll_append_node(&dst->input_framelist_head,
(void *) per_recv_char_buffer);
pthread_cond_signal(&dst->buffer_cv);
pthread_mutex_unlock(&dst->buffer_mutex);
}
else if (dst_type == SenderDst)
{
Sender * dst = &glb_senders_array[i];
pthread_mutex_lock(&dst->buffer_mutex);
ll_append_node(&dst->input_framelist_head,
(void *) per_recv_char_buffer);
pthread_cond_signal(&dst->buffer_cv);
pthread_mutex_unlock(&dst->buffer_mutex);
}
}
free(char_buffer);
return;
}
void handle_input_cmds(Sender * sender,
LLnode ** outgoing_frames_head_ptr)
{
int input_cmd_length = ll_get_length(sender->input_cmdlist_head);
//Split the message if it's too long
ll_split_head(&sender->input_cmdlist_head, FRAME_PAYLOAD_SIZE - 1);
//Recheck the command queue length to see if stdin_thread dumped a command on us
input_cmd_length = ll_get_length(sender->input_cmdlist_head);
while (input_cmd_length > 0)
{
//Pop a node off and update the input_cmd_length
LLnode * ll_input_cmd_node = ll_pop_node(&sender->input_cmdlist_head);
input_cmd_length = ll_get_length(sender->input_cmdlist_head);
//Cast to Cmd type and free up the memory for the node
Cmd * outgoing_cmd = (Cmd *) ll_input_cmd_node->value;
free(ll_input_cmd_node);
//Convert uint16_t to string
char* src = malloc(MAC_ADDR_SIZE);
char* dst = malloc(MAC_ADDR_SIZE);
sprintf(src, "%u", outgoing_cmd->src_id);
sprintf(dst, "%u", outgoing_cmd->dst_id);
int id = atoi(dst);
if(send_q_size(sender, id) < WS)
{
Frame * outgoing_frame = (Frame *) malloc (sizeof(Frame));
//Populate the outgoing frame's fields
strncpy(outgoing_frame->receiver_addr, dst, MAC_ADDR_SIZE);
strncpy(outgoing_frame->sender_addr, src, MAC_ADDR_SIZE);
strncpy(outgoing_frame->data, outgoing_cmd->message, FRAME_PAYLOAD_SIZE);
//Assign seqnum to the outgoing frame
outgoing_frame->seqnum = sender->seqnum[id];
char* raw_char_buf = convert_frame_to_char(outgoing_frame);
//Assign crc to the outgoing frame
outgoing_frame->crc = crc8(raw_char_buf, MAX_FRAME_SIZE);
free(raw_char_buf);
//At this point, we don't need the outgoing_cmd
free(outgoing_cmd->message);
free(outgoing_cmd);
//Update LFS
sender->LFS[id] = sender->seqnum[id];
//Convert the message to the outgoing_charbuf and send it
char * outgoing_charbuf = convert_frame_to_char(outgoing_frame);
//fprintf(stderr, "MESSAGE %s SENT\n", outgoing_frame->data);
ll_append_node(outgoing_frames_head_ptr, outgoing_charbuf);
sender->send_q_head[id][sender->seqnum[id] % WS]->frame = malloc(sizeof(Frame));
//Store the sent frame in the sent queue
memcpy(sender->send_q_head[id][sender->seqnum[id] % WS]->frame, outgoing_frame, sizeof(Frame));
sender->send_q_head[id][sender->seqnum[id] % WS]->frame_timeout = NULL;
free(outgoing_frame);
sender->seqnum[id] = (sender->seqnum[id] == 255) ? 0 : sender->seqnum[id] + 1;
}
else
{
ll_append_node_at_front(&sender->input_cmdlist_head, outgoing_cmd);
input_cmd_length = ll_get_length(sender->input_cmdlist_head);
break;
}
}
}
void handle_input_cmds(Sender * sender,
LLnode ** outgoing_frames_head_ptr)
{
//TODO: Suggested steps for handling input cmd
// 1) Dequeue the Cmd from sender->input_cmdlist_head
// 2) Convert to Frame
// 3) Set up the frame according to the sliding window protocol
// 4) Compute CRC and add CRC to Frame
int input_cmd_length = ll_get_length(sender->input_cmdlist_head);
//Recheck the command queue length to see if stdin_thread dumped a command on us
input_cmd_length = ll_get_length(sender->input_cmdlist_head);
ll_split_head(&sender->input_cmdlist_head, FRAME_PAYLOAD_SIZE - 1);
while (input_cmd_length > 0 && sender->sendQSize <= SWS)
{
// fprintf(stderr, "%d %d\n", input_cmd_length, ll_get_length(sender->input_cmdlist_head));
unsigned char upper = sender->LAR + SWS - 1;
//printf("%d %d %d ", sender->LAR, upper, sender->seqNum);
if (!((sender->LAR <= upper &&
sender->seqNum >= sender->LAR &&
sender->seqNum <= upper) ||
(sender->LAR > upper &&
(sender->seqNum >= sender->LAR ||
sender->seqNum <= upper))))
break;
//Pop a node off and update the input_cmd_length
LLnode * ll_input_cmd_node = ll_pop_node(&sender->input_cmdlist_head);
input_cmd_length = ll_get_length(sender->input_cmdlist_head);
//Cast to Cmd type and free up the memory for the node
Cmd * outgoing_cmd = (Cmd *) ll_input_cmd_node->value;
free(ll_input_cmd_node);
//DUMMY CODE: Add the raw char buf to the outgoing_frames list
//NOTE: You should not blindly send this message out!
// Ask yourself: Is this message actually going to the right receiver (recall that default behavior of send is to broadcast to all receivers)?
// Does the receiver have enough space in in it's input queue to handle this message?
// Were the previous messages sent to this receiver ACTUALLY delivered to the receiver?
int msg_length = strlen(outgoing_cmd->message);
if (msg_length > MAX_FRAME_SIZE)
{
//Do something about messages that exceed the frame size
printf("<SEND_%d>: sending messages of length greater than %d is not implemented\n", sender->send_id, MAX_FRAME_SIZE);
}
else
{
//This is probably ONLY one step you want
Frame * outgoing_frame = (Frame *) malloc (sizeof(Frame));
strcpy(outgoing_frame->data, outgoing_cmd->message);
outgoing_frame->src_id = outgoing_cmd->src_id;
outgoing_frame->dst_id = outgoing_cmd->dst_id;
outgoing_frame->seqNum = sender->seqNum;
sender->seqNum++;
//if (sender->seqNum >= SWS)
// sender->seqNum = 0;
//if (sender->seqNum == 5)
// sender->seqNum++;
//At this point, we don't need the outgoing_cmd
free(outgoing_cmd->message);
free(outgoing_cmd);
//Convert the message to the outgoing_charbuf
char * outgoing_charbuf = convert_frame_to_char(outgoing_frame);
append_crc(outgoing_charbuf, MAX_FRAME_SIZE);
//fprintf(stderr, "Sending %d with data %s\n", outgoing_frame->seqNum,outgoing_frame->data);
ll_append_node(outgoing_frames_head_ptr,
outgoing_charbuf);
int i = 0;
for (; i < SWS; i++) {
if (sender->sendQ[i].inuse == 0) {
sender->sendQSize++;
struct timeval * timeout = malloc(sizeof(struct timeval));
setTimeOutTime(timeout);
sender->sendQ[i].inuse = 1;
sender->sendQ[i].timeout = timeout;
sender->sendQ[i].msg =(Frame *)malloc(MAX_FRAME_SIZE);
memcpy(sender->sendQ[i].msg,outgoing_frame,MAX_FRAME_SIZE);
break;
}
}
free(outgoing_frame);
}
}
}
void handle_input_cmds(Sender * sender,
LLnode ** outgoing_frames_head_ptr)
{
//TODO: Suggested steps for handling input cmd
// 1) Dequeue the Cmd from sender->input_cmdlist_head
// 2) Convert to Frame
// 3) Set up the frame according to the sliding window protocol
// 4) Compute CRC and add CRC to Frame
int input_cmd_length = ll_get_length(sender->input_cmdlist_head);
//Recheck the command queue length to see if stdin_thread dumped a command on us
input_cmd_length = ll_get_length(sender->input_cmdlist_head);
while (input_cmd_length > 0)
{
//Pop a node off and update the input_cmd_length
LLnode * ll_input_cmd_node = ll_pop_node(&sender->input_cmdlist_head);
input_cmd_length = ll_get_length(sender->input_cmdlist_head);
//Cast to Cmd type and free up the memory for the node
Cmd * outgoing_cmd = (Cmd *) ll_input_cmd_node->value;
free(ll_input_cmd_node);
//DUMMY CODE: Add the raw char buf to the outgoing_frames list
//NOTE: You should not blindly send this message out!
// Ask yourself: Is this message actually going to the right receiver (recall that default behavior of send is to broadcast to all receivers)?
// Does the receiver have enough space in in it's input queue to handle this message?
// Were the previous messages sent to this receiver ACTUALLY delivered to the receiver?
int msg_length = strlen(outgoing_cmd->message);
if (msg_length > 0)
{
//init id
sender->recv_id = outgoing_cmd->dst_id;
//init sender
sender->LFS = -1;
sender->LAR = -1;
sender->SWS = 8;
sender->FSS = (msg_length + TEMP_SIZE - 1) / TEMP_SIZE;
//sender->FSS = (msg_length + TEMP_SIZE) / TEMP_SIZE;
sender->fin = 0;// not fin
free(sender->message);
sender->message = malloc(msg_length + 1);
strcpy(sender->message, outgoing_cmd->message);
sender->message_length = msg_length;
//init buffer;
sender->buffer = (struct Frame**) malloc(8 * sizeof(Frame*));
sender->timestamp = malloc(8 * sizeof(struct timeval));
int i;
struct timeval init_time;
gettimeofday(&init_time, NULL);
init_time.tv_sec += 999999;
for (i = 0; i < 8; i++)
{
sender->buffer[i] = malloc(1);
sender->timestamp[i] = init_time;
}
//print_sender(sender);
}
else
{
//This is probably ONLY one step you want
Frame * outgoing_frame = (Frame *) malloc (sizeof(Frame));
strcpy(outgoing_frame->data, outgoing_cmd->message);
//At this point, we don't need the outgoing_cmd
free(outgoing_cmd->message);
free(outgoing_cmd);
//Convert the message to the outgoing_charbuf
char * outgoing_charbuf = convert_frame_to_char(outgoing_frame);
//char * outgoing_charbuf = add_chksum(outgoing_frame);
ll_append_node(outgoing_frames_head_ptr,
outgoing_charbuf);
free(outgoing_frame);
}
}
}
void handle_pending_frame(Sender * sender,
LLnode ** outgoing_frames_head_ptr)
{
Frame* frame;
char* buf;
if (sender->fin == 2)
return;
if (sender->fin == 1)
return;
while ((sender->LFS - sender->LAR) < sender->SWS)
{
//calc whether LAR has been at the out part
//if ((sender->LFS) == (sender->FSS + 1))
if ((sender->LFS) == (sender->FSS))
{
//no more packets
sender->fin = 1;
//print_sender(sender);
break;
}
frame = build_frame(sender);
buf = add_chksum(frame);
//buf = convert_frame_to_char(frame);
// add into the sender buffer;
int pos;
pos = frame->seq % sender->SWS;
free (sender->buffer[pos]);
*(sender->buffer + pos) = (struct Frame*)frame;
/* buffer lookup
Frame* see;
int i;
for (i = 0; i < sender->SWS; i++)
{
see = sender->buffer[i];
fprintf(stderr, "%s\n", see->data);
}
*/
struct timeval now;
gettimeofday(&now, NULL);
//long long t;
//long wait_time = 1000000;
/*
now.tv_usec = now.tv_usec + wait_time;
if (now.tv_usec < wait_time)
{
now.tv_sec++;
now.tv_usec = now.tv_usec - wait_time;
}
*/
//now.tv_sec++;
sender->timestamp[pos] = now;
ll_append_node(outgoing_frames_head_ptr, buf);
}
}