int write_frame(int fd, unsigned char* buffer, int length, int* i ,int remaning) {
(void) signal(SIGALRM, Timeout); //
//SENDING FRAME
if(remaning == FALSE) {
linkLayer.frameLength = MAX_SIZE;
memcpy(linkLayer.frame, buffer + (*i * MAX_SIZE), MAX_SIZE); //to be used by the timeout
sendInformationFrame(buffer + (*i * MAX_SIZE), MAX_SIZE);
}
else {
linkLayer.frameLength = length;
memcpy(linkLayer.frame, buffer + (*i * MAX_SIZE), length);
sendInformationFrame(buffer + (*i * MAX_SIZE), length);
}
//after sending frame switch sequence Number
alarm(linkLayer.timeout);
int tmp = receiveframe(NULL,NULL);
if(tmp != RR_RECEIVED) { //Bad RR being the oldest RR
*i = *i - 1;
(void) signal(SIGALRM, SIG_IGN);
if( (tmp == BAD_RR_RECEIVED) || (tmp = BAD_REJ_RECEIVED)) rej_send_received++;
else if(tmp == REJ_RECEIVED) rej_send_received++;
else return -1;
}
else if(tmp == RR_RECEIVED){
(void) signal(SIGALRM, SIG_IGN);
linkLayer.sequenceNumber = linkLayer.sequenceNumber^1;
}
linkLayer.numTransmissions = 0;
}
void Timeout() {
if(linkLayer.numTransmissions < MAXR-1){
printf("[TIMEOUT] Timeout %d -> ", linkLayer.numTransmissions);
if(!linkLayer.alarm_inf){
printf("Sending Supervision Frame\n");
if(!sendSupervisionFrame(linkLayer.fd, linkLayer.alarm_char)) exit(-1);
}
else if(linkLayer.alarm_inf) {
printf("Sending Informacion Frame\n");
if(!sendInformationFrame(linkLayer.frame, linkLayer.frameLength)) exit(-1);
}
else exit(-1);
alarm(linkLayer.timeout);
}
else if (linkLayer.numTransmissions == MAXR-1) {
printf("[TIMEOUT] Port closing, didn't get any response\n");
close(linkLayer.fd);
exit(-1);
}
linkLayer.numTransmissions++;
timeout_time++; //for external variable
}
int llwrite(int fd, unsigned char* buffer, int length) {
printf("[LLWRITE] START\n");
linkLayer.timeout = 0;
int CompleteFrames = length / MAX_SIZE;
int remainingBytes = length % MAX_SIZE;
int flag = 1;
(void) signal(SIGALRM, atende);
linkLayer.numTransmissions = 0;
linkLayer.timeout = MAXT;
int i;
for(i = 0; i < CompleteFrames; i++){
flag = 1;
while(linkLayer.numTransmissions < MAXT && flag) {
printf("[LLWRITE] Frames = %d\n", i);
if(alarm_flag){
sendInformationFrame(buffer + (i * MAX_SIZE), MAX_SIZE);
alarm(linkLayer.timeout); // activa alarme de 3s
alarm_flag=0;
}
if(receiveframe(NULL,NULL) != RR_RECEIVED) {
if(receiveframe(NULL,NULL) == REJ_RECEIVED) linkLayer.numTransmissions = 0;
else return -1;
}
else if(receiveframe(NULL,NULL) == RR_RECEIVED) flag =0;
}
}
if(remainingBytes > 0){
printf("[LLWRITE] START\n");
flag = 1;
while(linkLayer.numTransmissions < MAXT && flag) {
if(alarm_flag){
sendInformationFrame(buffer + (i * MAX_SIZE), remainingBytes);
alarm(linkLayer.timeout); // activa alarme de 3s
alarm_flag=0;
}
if(receiveframe(NULL,NULL) != RR_RECEIVED) {
if(receiveframe(NULL,NULL) == REJ_RECEIVED) linkLayer.numTransmissions = 0;
else return -1;
}
else if(receiveframe(NULL,NULL) == RR_RECEIVED) flag =0;
}
}
printf("[LLWRITE] END\n");
return 0;
}
