changed code for Select API

src/main.c

@@ -2,7 +2,7 @@
  * iperfjd -- greatly simplified version of iperf with the same interface
  * semantics
  *
- * jdugan -- 24 Jan 2009
+ * kprabhu - 29th May 2009
  *
  */
 
@@ -43,6 +43,7 @@ enum {
 
     uS_TO_NS = 1000,
 
+	MAX_BUFFER_SIZE =10,
     DEFAULT_UDP_BUFSIZE = 1470,
     DEFAULT_TCP_BUFSIZE = 8192
 };
@@ -71,6 +72,7 @@ struct iperf_stream
     struct iperf_stream *next;
 };
 
+// Run routines for TCP and UDP- will be called by pthread_create() indirectly
 void *udp_client_thread(struct iperf_stream *sp);
 void *udp_server_thread(struct iperf_stream *sp);
 void *tcp_client_thread(struct iperf_stream *sp);
@@ -124,6 +126,30 @@ default_settings(struct iperf_settings *settings)
 struct iperf_stream *streams;  /* head of list of streams */
 int done = 0;
 
+
+
+
+/*--------------------------------------------------------
+ * Displays the current list of streams
+ -------------------------------------------------------*/
+void Display()
+{
+	struct iperf_stream * n;
+	n= streams;
+	int count=1;
+	while(n->next!=NULL)
+	{
+		printf("position-%d\tsp=%d\tsocket=%d\n",count++,(int)n,n->sock);
+		n=n->next;
+	}
+	
+}
+
+
+
+/*--------------------------------------------------------
+ * sets the parameters for the new stream created
+ -------------------------------------------------------*/
 struct iperf_stream *
 new_stream(int s, struct iperf_settings *settings)
 {
@@ -136,12 +162,14 @@ new_stream(int s, struct iperf_settings *settings)
         return(NULL);
     }
 
-
+	//initialise sp with 0
     memset(sp, 0, sizeof(struct iperf_stream));
 
+	// copy settings and passed socket into stream
     sp->settings = settings;
     sp->sock = s;
 
+	
     len = sizeof sp->local;
     if(getsockname(sp->sock, (struct sockaddr *) &sp->local, &len) < 0) {
         perror("getsockname");
@@ -149,22 +177,26 @@ new_stream(int s, struct iperf_settings *settings)
         return(NULL);
     }
 	
+	//converts the local ip into string address
     if(inet_ntop(AF_INET, (void *) &sp->local.sin_addr,
                 (void *) &sp->local_addr, 512) == NULL) {
         perror("inet_pton");
     }
 
+	//stores the socket id.
     if(getpeername(sp->sock, (struct sockaddr *) &sp->peer, &len) < 0) {
         perror("getpeername");
         free(sp);
         return(NULL);
     }
 
+	// converts the remote ip into string address
     if(inet_ntop(AF_INET, (void *) &sp->peer.sin_addr,
                 (void *) &sp->peer_addr, 512) == NULL) {
         perror("inet_pton");
     }
 	
+	// sets appropriate function pointer
     switch (settings->proto) {
         case Ptcp:
             sp->client = (void *) tcp_client_thread;
@@ -199,6 +231,11 @@ new_stream(int s, struct iperf_settings *settings)
     return(sp);
 }
 
+
+
+/*--------------------------------------------------------
+ * add a stream into stream_list linked list
+ -------------------------------------------------------*/
 void
 add_stream(struct iperf_stream *sp)
 {
@@ -214,12 +251,75 @@ add_stream(struct iperf_stream *sp)
     }
 }
 
-void
+
+/*--------------------------------------------------------
+ * delete the stream
+ -------------------------------------------------------*/
+int
 free_stream(struct iperf_stream *sp)
 {
-    free(sp);
+	printf("I am in free_stream \n");
+	
+	struct iperf_stream *prev,*start;
+	prev = streams;
+	start = streams;
+	
+	if(streams->sock==sp->sock)
+	{
+		printf("in 1 -Deleted\n\n\n");
+		streams=streams->next;
+		return 0;
+	}
+	else
+	{		
+		do
+		{
+			start= streams->next;
+			
+			if(start->sock==sp->sock)
+			{
+				printf("Deleting socket %d \t",sp->sock); 
+				prev->next = sp->next;
+				printf("Deleted\n\n\n");
+				free(sp);
+				return 0;				
+			}
+			prev=prev->next;
+		
+		}while(start->next!=NULL);
+		
+		return -1;
+	}
+	
 }
 
+
+/*--------------------------------------------------------
+ * update the stream
+ -------------------------------------------------------*/
+struct iperf_stream * 
+find_update_stream(int j, int result)
+{
+	struct iperf_stream *n;
+	n=streams;
+	//find the correct stream for update
+	do
+	{
+		if(n->sock==j)
+		{
+			n->bytes_in+= result;		//update the byte count
+			break;
+		}
+		n = n->next;
+		
+	}while(n->next!=NULL);
+	
+	return n;	
+}
+
+/*--------------------------------------------------------
+ * Display connected message
+ -------------------------------------------------------*/
 void connect_msg(struct iperf_stream *sp)
 {
     char *ipl, *ipr;
@@ -233,6 +333,10 @@ void connect_msg(struct iperf_stream *sp)
             sp->peer_addr, htons(sp->peer.sin_port));
 }
 
+
+/*--------------------------------------------------------
+ * UDP client functionality.
+ -------------------------------------------------------*/
 void *
 udp_client_thread(struct iperf_stream *sp)
 {
@@ -296,6 +400,10 @@ udp_client_thread(struct iperf_stream *sp)
     pthread_exit(NULL);
 }
 
+
+/*--------------------------------------------------------
+ * UDP Server functionality.
+ -------------------------------------------------------*/
 void *
 udp_server_thread(struct iperf_stream *sp)
 {
@@ -318,16 +426,30 @@ udp_server_thread(struct iperf_stream *sp)
     pthread_exit(NULL);
 }
 
+
+/*--------------------------------------------------------
+ * UDP Reporting routine
+ -------------------------------------------------------*/
 void
 udp_report(int final)
 {
 }
 
+
+
+/*--------------------------------------------------------
+ * UDP Reporting routine
+ -------------------------------------------------------*/
 void
 tcp_report(int final)
 {
 }
 
+
+/*--------------------------------------------------------
+ * TCP client functionality
+ * -------------------------------------------------------*/
+
 void *
 tcp_client_thread(struct iperf_stream *sp)
 {
@@ -361,6 +483,9 @@ tcp_client_thread(struct iperf_stream *sp)
     pthread_exit(NULL);
 }
 
+/*--------------------------------------------------------
+ * TCP Server functionality
+ * -------------------------------------------------------*/
 void *
 tcp_server_thread(struct iperf_stream *sp)
 {
@@ -385,6 +510,10 @@ tcp_server_thread(struct iperf_stream *sp)
     pthread_exit(NULL);
 }
 
+
+/*--------------------------------------------------------
+ * This is code for Client 
+ * -------------------------------------------------------*/
 int
 client(struct iperf_settings *settings)
 {
@@ -407,14 +536,18 @@ client(struct iperf_settings *settings)
         sp = new_stream(s, settings);
         add_stream(sp);
         connect_msg(sp);
+		// need to replace this with Select
         pthread_create(&sp->thread, NULL, sp->client, (void *) sp);
     }
 
     timer = new_timer(settings->duration, 0);
 	
+	// wait till the timer expires
     while(!timer->expired(timer))
         sleep(settings->duration);
 
+	// this is checked in UDP/TCP while loop
+	// to stop sending packets. Global member
     done = 1;
 
     /* XXX: report */
@@ -427,14 +560,25 @@ client(struct iperf_settings *settings)
     return 0;
 }
 
+/*--------------------------------------------------------
+ * This is code for Server 
+ * -------------------------------------------------------*/
 int
 server(struct iperf_settings *settings)
 {
     int s, cs, sz;
-    struct iperf_stream *sp;
+    struct iperf_stream *sp,*temp;
     struct sockaddr_in sa_peer;
     socklen_t len;
     char buf[settings->bufsize], ubuf[UNIT_LEN];
+	fd_set readset, tempset;
+	int maxfd, flags;
+	int peersock, j, result, result1, sent;	
+	struct timeval tv;
+	
+ 	char buffer[DEFAULT_TCP_BUFSIZE];
+	
+	struct sockaddr_in addr;
 
     s = netannounce(settings->proto, NULL, settings->port);
     if(s < 0)
@@ -451,41 +595,155 @@ server(struct iperf_settings *settings)
     if((x = getsock_tcp_windowsize(s, SO_RCVBUF)) < 0) 
         perror("SO_RCVBUF");
 
+	/*
     unit_snprintf(ubuf, UNIT_LEN, (double) x, 'A');
     printf("%s: %s\n",
             settings->proto == Ptcp ? "TCP window size" : "UDP buffer size", ubuf);
+	 */
     printf("-----------------------------------------------------------\n");
 
     len = sizeof sa_peer;
-    while(1) {
-        if (Ptcp == settings->proto) {
-            if( (cs = accept(s, (struct sockaddr *) &sa_peer, &len)) < 0) {
-                perror("accept");
-                return -1;
-            }
-            sp = new_stream(cs, settings);
-        } else if (Pudp == settings->proto) {
-            sz = recvfrom(s, buf, settings->bufsize, 0, (struct sockaddr *) &sa_peer, &len);
-            if(!sz)
-                break;
 	
-            if(connect(s, (struct sockaddr *) &sa_peer, len) < 0) {
+	FD_ZERO(&readset);
-                perror("connect");
+	FD_SET(s, &readset);
-                return -1;
+	maxfd = s;
-            }
 	
-            sp = new_stream(s, settings);
+	do {
-            sp->bytes_in += sz;
+		
+		memcpy(&tempset, &readset, sizeof(tempset));
+		tv.tv_sec = 15;			// timeout interval in seconds
+		tv.tv_usec = 0;
+		
+		// using select to check on multiple descriptors.
+		result = select(maxfd + 1, &tempset, NULL, NULL, &tv);
+		
+		if (result == 0) 
+		{
+			printf("select() timed out!\n");
+		}
+		else if (result < 0 && errno != EINTR)
+		{
+			printf("Error in select(): %s\n", strerror(errno));
+		}
+		else if (result > 0) 
+		{
+			
+			if (FD_ISSET(s, &tempset))
+			{
+				if(settings->proto== Ptcp)		// New TCP Connection
+				{
+					len = sizeof(addr);
+					peersock = accept(s,(struct sockaddr *) &addr, &len);
+					if (peersock < 0) 
+					{
+						printf("Error in accept(): %s\n", strerror(errno));
+					}
+					else 
+					{
+						printf("=========================\n");
+						printf("%d is the socket number\n",peersock);
+						FD_SET(peersock, &readset);
+						maxfd = (maxfd < peersock)?peersock:maxfd;
+						// creating a new stream
+						sp = new_stream(peersock, settings);
+						printf(" new stream is %d \n", (int)sp);
+						// need to manage the linked list of streams
+						add_stream(sp);					
+						connect_msg(sp);
+						
+						Display();
+					}		
+					
+				}
+				
+				else if ( settings->proto== Pudp)	//New UDP Connection
+				{
+					// getting a new UDP packet
+					sz = recvfrom(s, buf, settings->bufsize, 0, (struct sockaddr *) &sa_peer, &len);
+					if(!sz)
+						break;
+							
+					if(connect(s, (struct sockaddr *) &sa_peer, len) < 0)
+					{
+						perror("connect");
+						return -1;
+					}
+										
+					// get a new socket to connect to client
+					printf("=========================\n");				
+					sp = new_stream(s, settings);
+					sp->bytes_in += sz;	
+					printf(" new stream is %d \n", (int)sp);
+					// need to manage the linked list of streams
+					add_stream(sp);
+
+					
+					s = netannounce(settings->proto, NULL, settings->port);
+					if(s < 0) 
+						return -1;
+					
+					// same as TCP -repetation
+					printf("%d is the socket number\n",s);
+					FD_SET(s, &readset);
+					maxfd = (maxfd < s)?s:maxfd;
+					
+				}
+				
+				FD_CLR(s, &tempset);
+				
+			}
+			
+			
+			// scanning all socket descriptors for read
+			for (j=0; j<maxfd+1; j++)
+			{
+				if (FD_ISSET(j, &tempset))
+				{					
+					do
+					{	
+						if(settings->proto==Ptcp)
+							result = recv(j, buffer,DEFAULT_TCP_BUFSIZE, 0);
+					   else
+						   result = recv(j, buffer,DEFAULT_UDP_BUFSIZE, 0);
+						
+					} while (result == -1 && errno == EINTR);
+					
+														
+					if (result > 0)
+					{
+						sp=find_update_stream(j,result);
+																																		
+					}
+					else if (result == 0)
+					{
+						Display();
+												
+						//just find the stream with zero update
+						sp = find_update_stream(j,0);											
+						
+						if(settings->proto == Ptcp)
+						{
+							//printf("window: %d\n", getsock_tcp_windowsize(sp->sock, SO_RCVBUF));
+						}
+												
+									
+						unit_snprintf(ubuf, UNIT_LEN, (double) sp->bytes_in / sp->settings->duration, 'a');
+						printf("%llu bytes received %s/sec for stream %d\n\n", sp->bytes_in, ubuf,(int)sp);
+						close(j);
+						FD_CLR(j, &readset);
+						free_stream(sp);	// this needs to be a linked list delete
+						//break;
+					}
+					else 
+					{
+						printf("Error in recv(): %s\n", strerror(errno));
+					}
+				}      // end if (FD_ISSET(j, &tempset))
+			}      // end for (j=0;...)
+		}      // end else if (result > 0)
+	} while (1);
 	
-            s = netannounce(settings->proto, NULL, settings->port);
-            if(s < 0) {
-                return -1;
-            }
-        }
  
-        connect_msg(sp);
-        pthread_create(&sp->thread, NULL, sp->server, (void *) sp);
-    }
 
     return 0;
 }