diff --git a/10.client-server_recursive_kill_zombies_plus_err_accept/makefile b/10.client-server_recursive_kill_zombies_plus_err_accept/makefile
index 16fdd6d..a9beab6 100644
--- a/10.client-server_recursive_kill_zombies_plus_err_accept/makefile
+++ b/10.client-server_recursive_kill_zombies_plus_err_accept/makefile
@@ -1,9 +1,14 @@
+CC = gcc
+CFLAGS =
 all : server client
+
 server : daytimesrv.o ../fun-corso-reti.o
-	gcc -o server daytimesrv.o ../fun-corso-reti.o
+	$(CC)  -o server daytimesrv.o ../fun-corso-reti.o $(CFLAGS)
 client : daytimecli.o ../fun-corso-reti.o
-	gcc -o client daytimecli.o ../fun-corso-reti.o
+	$(CC)  -o client daytimecli.o ../fun-corso-reti.o $(CFLAGS)
 daytimesrv.o : daytimesrv.c ../basic.h
-	gcc -c -o daytimesrv.o daytimesrv.c
+	$(CC) -c  -o daytimesrv.o daytimesrv.c $(CFLAGS)
 fun-corso-reti.o : ../fun-corso-reti.c ../basic.h
-	gcc -c -o ../fun-corso-reti.o ../fun-corso-reti.c
+	$(CC) -c  -o ../fun-corso-reti.o ../fun-corso-reti.c $(CFLAGS)
+daytimecli.o : daytimecli.c ../basic.h
+	$(CC) -c -o daytimecli.o daytimecli.c $(CFLAGS)
diff --git a/12.3 nodes communication/makefile b/12.3 nodes communication/makefile
index 16fdd6d..a9beab6 100644
--- a/12.3 nodes communication/makefile	
+++ b/12.3 nodes communication/makefile	
@@ -1,9 +1,14 @@
+CC = gcc
+CFLAGS =
 all : server client
+
 server : daytimesrv.o ../fun-corso-reti.o
-	gcc -o server daytimesrv.o ../fun-corso-reti.o
+	$(CC)  -o server daytimesrv.o ../fun-corso-reti.o $(CFLAGS)
 client : daytimecli.o ../fun-corso-reti.o
-	gcc -o client daytimecli.o ../fun-corso-reti.o
+	$(CC)  -o client daytimecli.o ../fun-corso-reti.o $(CFLAGS)
 daytimesrv.o : daytimesrv.c ../basic.h
-	gcc -c -o daytimesrv.o daytimesrv.c
+	$(CC) -c  -o daytimesrv.o daytimesrv.c $(CFLAGS)
 fun-corso-reti.o : ../fun-corso-reti.c ../basic.h
-	gcc -c -o ../fun-corso-reti.o ../fun-corso-reti.c
+	$(CC) -c  -o ../fun-corso-reti.o ../fun-corso-reti.c $(CFLAGS)
+daytimecli.o : daytimecli.c ../basic.h
+	$(CC) -c -o daytimecli.o daytimecli.c $(CFLAGS)
diff --git a/13.mail smtp test and errors/makefile b/13.mail smtp test and errors/makefile
index 16fdd6d..a9beab6 100644
--- a/13.mail smtp test and errors/makefile	
+++ b/13.mail smtp test and errors/makefile	
@@ -1,9 +1,14 @@
+CC = gcc
+CFLAGS =
 all : server client
+
 server : daytimesrv.o ../fun-corso-reti.o
-	gcc -o server daytimesrv.o ../fun-corso-reti.o
+	$(CC)  -o server daytimesrv.o ../fun-corso-reti.o $(CFLAGS)
 client : daytimecli.o ../fun-corso-reti.o
-	gcc -o client daytimecli.o ../fun-corso-reti.o
+	$(CC)  -o client daytimecli.o ../fun-corso-reti.o $(CFLAGS)
 daytimesrv.o : daytimesrv.c ../basic.h
-	gcc -c -o daytimesrv.o daytimesrv.c
+	$(CC) -c  -o daytimesrv.o daytimesrv.c $(CFLAGS)
 fun-corso-reti.o : ../fun-corso-reti.c ../basic.h
-	gcc -c -o ../fun-corso-reti.o ../fun-corso-reti.c
+	$(CC) -c  -o ../fun-corso-reti.o ../fun-corso-reti.c $(CFLAGS)
+daytimecli.o : daytimecli.c ../basic.h
+	$(CC) -c -o daytimecli.o daytimecli.c $(CFLAGS)
diff --git a/7.client-server-daytime/daytimesrv.o b/7.client-server-daytime/daytimesrv.o
index a970700..b17ac13 100644
Binary files a/7.client-server-daytime/daytimesrv.o and b/7.client-server-daytime/daytimesrv.o differ
diff --git a/7.client-server-daytime/makefile b/7.client-server-daytime/makefile
index 16fdd6d..a9beab6 100644
--- a/7.client-server-daytime/makefile
+++ b/7.client-server-daytime/makefile
@@ -1,9 +1,14 @@
+CC = gcc
+CFLAGS =
 all : server client
+
 server : daytimesrv.o ../fun-corso-reti.o
-	gcc -o server daytimesrv.o ../fun-corso-reti.o
+	$(CC)  -o server daytimesrv.o ../fun-corso-reti.o $(CFLAGS)
 client : daytimecli.o ../fun-corso-reti.o
-	gcc -o client daytimecli.o ../fun-corso-reti.o
+	$(CC)  -o client daytimecli.o ../fun-corso-reti.o $(CFLAGS)
 daytimesrv.o : daytimesrv.c ../basic.h
-	gcc -c -o daytimesrv.o daytimesrv.c
+	$(CC) -c  -o daytimesrv.o daytimesrv.c $(CFLAGS)
 fun-corso-reti.o : ../fun-corso-reti.c ../basic.h
-	gcc -c -o ../fun-corso-reti.o ../fun-corso-reti.c
+	$(CC) -c  -o ../fun-corso-reti.o ../fun-corso-reti.c $(CFLAGS)
+daytimecli.o : daytimecli.c ../basic.h
+	$(CC) -c -o daytimecli.o daytimecli.c $(CFLAGS)
diff --git a/7.client-server-daytime/server b/7.client-server-daytime/server
index f434b73..1b7ddbe 100755
Binary files a/7.client-server-daytime/server and b/7.client-server-daytime/server differ
diff --git a/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/client b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/client
new file mode 100755
index 0000000..1480f83
Binary files /dev/null and b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/client differ
diff --git a/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/daytimecli.c b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/daytimecli.c
new file mode 100644
index 0000000..f02e382
--- /dev/null
+++ b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/daytimecli.c	
@@ -0,0 +1,49 @@
+
+
+#include	"../basic.h"
+
+int main(int argc, char **argv) {
+	int			sockfd;
+	struct sockaddr_in	servaddr;
+
+	if (argc != 3){
+		printf("usage: daytimecli <indirizzoIP> <porta> \n");
+		exit(0);
+}
+        if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 ){
+			printf("socket error\n");
+			exit(0);
+}
+	bzero(&servaddr, sizeof(servaddr));
+	servaddr.sin_family = AF_INET;
+        servaddr.sin_port = htons(atoi(argv[2])); /* server port */ 
+
+        if (inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0){
+                printf("inet_pton error for %s\n", argv[1]);
+		exit(0);
+}
+	if (connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr)) < 0){
+		printf("connect error\n");
+		exit(0);
+	}
+	
+	char server_address_redeable[INET_ADDRSTRLEN];
+	short server_port_redeable;
+
+	struct sockaddr_in	server_struct;
+	unsigned int server_struct_size = sizeof(server_struct);
+	
+
+	int ridden;
+	ridden = read (sockfd, &server_struct,server_struct_size );
+	//fprintf(stdout,"Ho letto  %d\n bytes",ridden);
+	
+	
+	inet_ntop(AF_INET, &(server_struct.sin_addr), server_address_redeable, INET_ADDRSTRLEN);// get ip
+	server_port_redeable = ntohs(server_struct.sin_port);// get  port
+		
+	fprintf (stdout,"%s%c%hu\n",server_address_redeable,':',server_port_redeable);
+	
+	
+	exit(0);
+}
diff --git a/7.client-server-print-ip-port-both/daytimecli.c b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/daytimecli.c~
similarity index 100%
rename from 7.client-server-print-ip-port-both/daytimecli.c
rename to 7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/daytimecli.c~
diff --git a/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/daytimecli.o b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/daytimecli.o
new file mode 100644
index 0000000..1b032de
Binary files /dev/null and b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/daytimecli.o differ
diff --git a/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/daytimesrv.c b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/daytimesrv.c
new file mode 100644
index 0000000..1a19fac
--- /dev/null
+++ b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/daytimesrv.c	
@@ -0,0 +1,62 @@
+
+
+#include	"../basic.h"
+#include	<time.h>
+
+int main(int argc, char **argv) {
+	int			listenfd, connfd, n;
+	struct sockaddr_in	servaddr;
+
+
+	if (argc != 2 ){
+		printf("usage: daytimesrv <porta>\n");
+		exit(0);
+}
+	if( (listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
+		printf("socket error\n");
+		exit(0);
+}
+	bzero(&servaddr, sizeof(servaddr));
+	servaddr.sin_family      = AF_INET;
+	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);   /* wildcard address */
+	servaddr.sin_port        = htons(atoi(argv[1])); /* server port */
+
+	if( (bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr))) < 0){
+		printf("bind error\n"); exit(0);
+}
+	if( listen(listenfd, 5) < 0 )
+		{ printf("listen error\n");
+		  exit(0);
+		}
+
+	char			client_address_redeable[INET_ADDRSTRLEN];
+	short			client_port_redeable;
+
+	struct sockaddr_in	client_address_struct;
+	unsigned int client_address_struct_size = sizeof(client_address_struct);
+	
+	struct sockaddr_in	server_struct_to_send;
+	unsigned int server_struct_to_send_size = sizeof(server_struct_to_send);
+	
+	
+
+	for ( ; ; ) {
+		if( (connfd = accept(listenfd, (struct sockaddr *) &client_address_struct, &client_address_struct_size)) < 0)
+		{ printf("accept error\n");
+		exit(0);
+		} 
+
+		inet_ntop(AF_INET, &(client_address_struct.sin_addr), client_address_redeable, INET_ADDRSTRLEN);// get client ip
+		client_port_redeable = ntohs(client_address_struct.sin_port);// get client port
+		
+		fprintf (stdout,"%s%c%hu\n",client_address_redeable,':',client_port_redeable);
+		
+		
+		
+		getsockname (connfd, (struct sockaddr *) &server_struct_to_send, &server_struct_to_send_size);
+		write (connfd,&server_struct_to_send, server_struct_to_send_size);
+		
+		
+		close(connfd);
+	}
+}
diff --git a/7.client-server-print-ip-port-both/daytimesrv.c b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/daytimesrv.c~
similarity index 100%
rename from 7.client-server-print-ip-port-both/daytimesrv.c
rename to 7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/daytimesrv.c~
diff --git a/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/daytimesrv.o b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/daytimesrv.o
new file mode 100644
index 0000000..d378ae7
Binary files /dev/null and b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/daytimesrv.o differ
diff --git a/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/makefile b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/makefile
new file mode 100644
index 0000000..a9beab6
--- /dev/null
+++ b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/makefile	
@@ -0,0 +1,14 @@
+CC = gcc
+CFLAGS =
+all : server client
+
+server : daytimesrv.o ../fun-corso-reti.o
+	$(CC)  -o server daytimesrv.o ../fun-corso-reti.o $(CFLAGS)
+client : daytimecli.o ../fun-corso-reti.o
+	$(CC)  -o client daytimecli.o ../fun-corso-reti.o $(CFLAGS)
+daytimesrv.o : daytimesrv.c ../basic.h
+	$(CC) -c  -o daytimesrv.o daytimesrv.c $(CFLAGS)
+fun-corso-reti.o : ../fun-corso-reti.c ../basic.h
+	$(CC) -c  -o ../fun-corso-reti.o ../fun-corso-reti.c $(CFLAGS)
+daytimecli.o : daytimecli.c ../basic.h
+	$(CC) -c -o daytimecli.o daytimecli.c $(CFLAGS)
diff --git a/7.client-server-print-ip-port-both/makefile~ b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/makefile~
similarity index 100%
rename from 7.client-server-print-ip-port-both/makefile~
rename to 7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/makefile~
diff --git a/7.client-server-print-ip-port-both/readme b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/readme
similarity index 100%
rename from 7.client-server-print-ip-port-both/readme
rename to 7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/readme
diff --git a/7.client-server-print-ip-port-both/readme~ b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/readme~
similarity index 100%
rename from 7.client-server-print-ip-port-both/readme~
rename to 7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/readme~
diff --git a/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/server b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/server
new file mode 100755
index 0000000..833ba65
Binary files /dev/null and b/7.client-server-print-ip-port-both (OK - NO ERRORS CHECKS)/server differ
diff --git a/7.client-server-print-ip-port-both/client b/7.client-server-print-ip-port-both/client
deleted file mode 100755
index 9bfcd74..0000000
Binary files a/7.client-server-print-ip-port-both/client and /dev/null differ
diff --git a/7.client-server-print-ip-port-both/daytimecli.o b/7.client-server-print-ip-port-both/daytimecli.o
deleted file mode 100644
index 5787be5..0000000
Binary files a/7.client-server-print-ip-port-both/daytimecli.o and /dev/null differ
diff --git a/7.client-server-print-ip-port-both/daytimesrv.c~ b/7.client-server-print-ip-port-both/daytimesrv.c~
deleted file mode 100644
index 5a71bf1..0000000
--- a/7.client-server-print-ip-port-both/daytimesrv.c~
+++ /dev/null
@@ -1,41 +0,0 @@
-/* stampa l'ip del client */
-
-#include	"../basic.h"
-#include	<time.h>
-
-int main(int argc, char **argv) {
-	int			listenfd, connfd, n;
-	struct sockaddr_in	servaddr;
-	char			buff[MAXLINE];
-	time_t			ticks;
-
-	if (argc != 2 ){
-		printf("usage: daytimesrv <porta>\n");
-		exit(0);
-}
-	if( (listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
-		printf("socket error\n");
-		exit(0);
-}
-	bzero(&servaddr, sizeof(servaddr));
-	servaddr.sin_family      = AF_INET;
-	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);   /* wildcard address */
-	servaddr.sin_port        = htons(atoi(argv[1])); /* server port */
-
-	if( (bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr))) < 0){
-		printf("bind error\n"); exit(0);
-}
-	if( listen(listenfd, 5) < 0 )
-		{ printf("listen error\n");
-		  exit(0);
-}
-	for ( ; ; ) {
-		if( (connfd = accept(listenfd, (struct sockaddr *) NULL, NULL)) < 0)
-		{ printf("accept error\n"); exit(0);} else {
-		}
-
-		n=read(connfd, buff, MAXLINE);
-		fprintf (stdout,%s\n,buff);
-		close(connfd);
-	}
-}
diff --git a/7.client-server-print-ip-port-both/daytimesrv.o b/7.client-server-print-ip-port-both/daytimesrv.o
deleted file mode 100644
index e160c2e..0000000
Binary files a/7.client-server-print-ip-port-both/daytimesrv.o and /dev/null differ
diff --git a/7.client-server-print-ip-port-both/server b/7.client-server-print-ip-port-both/server
deleted file mode 100755
index 65d3aab..0000000
Binary files a/7.client-server-print-ip-port-both/server and /dev/null differ
diff --git a/7.client-server-printipclient/makefile b/7.client-server-printipclient/makefile
index 16fdd6d..a9beab6 100644
--- a/7.client-server-printipclient/makefile
+++ b/7.client-server-printipclient/makefile
@@ -1,9 +1,14 @@
+CC = gcc
+CFLAGS =
 all : server client
+
 server : daytimesrv.o ../fun-corso-reti.o
-	gcc -o server daytimesrv.o ../fun-corso-reti.o
+	$(CC)  -o server daytimesrv.o ../fun-corso-reti.o $(CFLAGS)
 client : daytimecli.o ../fun-corso-reti.o
-	gcc -o client daytimecli.o ../fun-corso-reti.o
+	$(CC)  -o client daytimecli.o ../fun-corso-reti.o $(CFLAGS)
 daytimesrv.o : daytimesrv.c ../basic.h
-	gcc -c -o daytimesrv.o daytimesrv.c
+	$(CC) -c  -o daytimesrv.o daytimesrv.c $(CFLAGS)
 fun-corso-reti.o : ../fun-corso-reti.c ../basic.h
-	gcc -c -o ../fun-corso-reti.o ../fun-corso-reti.c
+	$(CC) -c  -o ../fun-corso-reti.o ../fun-corso-reti.c $(CFLAGS)
+daytimecli.o : daytimecli.c ../basic.h
+	$(CC) -c -o daytimecli.o daytimecli.c $(CFLAGS)
diff --git a/7.client-server-select/client b/7.client-server-select/client
new file mode 100755
index 0000000..1480f83
Binary files /dev/null and b/7.client-server-select/client differ
diff --git a/7.client-server-print-ip-port-both/daytimecli.c~ b/7.client-server-select/daytimecli.c
similarity index 80%
rename from 7.client-server-print-ip-port-both/daytimecli.c~
rename to 7.client-server-select/daytimecli.c
index 239a866..37ce25d 100644
--- a/7.client-server-print-ip-port-both/daytimecli.c~
+++ b/7.client-server-select/daytimecli.c
@@ -1,10 +1,13 @@
-/* Client che interroga un daytime server */
+
 
 #include	"../basic.h"
 
+typedef struct message {
+	char data[100];
+}t_message;
+
 int main(int argc, char **argv) {
-	int			sockfd, n;
-	char			recvline[MAXLINE + 1];
+	int			sockfd;
 	struct sockaddr_in	servaddr;
 
 	if (argc != 3){
@@ -27,5 +30,18 @@ int main(int argc, char **argv) {
 		printf("connect error\n");
 		exit(0);
 	}
+	
+	t_message m;
+	
+	fscanf(stdin)
+	
+
+	
+	
+	int ridden;
+	ridden = read (sockfd, &m,sizeof(m) );
+
+	
+	
 	exit(0);
 }
diff --git a/7.client-server-select/daytimecli.c~ b/7.client-server-select/daytimecli.c~
new file mode 100644
index 0000000..4d31ed5
--- /dev/null
+++ b/7.client-server-select/daytimecli.c~
@@ -0,0 +1,51 @@
+
+
+#include	"../basic.h"
+
+int main(int argc, char **argv) {
+	int			sockfd;
+	struct sockaddr_in	servaddr;
+
+	if (argc != 3){
+		printf("usage: daytimecli <indirizzoIP> <porta> \n");
+		exit(0);
+}
+        if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 ){
+			printf("socket error\n");
+			exit(0);
+}
+	bzero(&servaddr, sizeof(servaddr));
+	servaddr.sin_family = AF_INET;
+        servaddr.sin_port = htons(atoi(argv[2])); /* server port */ 
+
+        if (inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0){
+                printf("inet_pton error for %s\n", argv[1]);
+		exit(0);
+}
+	if (connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr)) < 0){
+		printf("connect error\n");
+		exit(0);
+	}
+	
+	struct sockaddr_in	r_server_local_addr;
+	unsigned int r_server_local_addr_len = sizeof(r_server_local_addr);
+	
+	char * socket_buffer = (char *) malloc (r_server_local_addr_len) ;
+	int ridden;
+	ridden = read (sockfd, socket_buffer,r_server_local_addr_len );
+	fprintf(stdout,"Ho letto  %d\n bytes",ridden);
+	
+	memcpy (&r_server_local_addr,socket_buffer, r_server_local_addr_len);
+	
+	
+	char buff[INET_ADDRSTRLEN];
+	short port;
+	
+	inet_ntop(AF_INET, &(r_server_local_addr.sin_addr), buff, INET_ADDRSTRLEN);// get ip
+	port = ntohs(r_server_local_addr.sin_port);// get  port
+		
+	fprintf (stdout,"%s%c%hu\n",buff,':',port);
+	
+	
+	exit(0);
+}
diff --git a/7.client-server-select/daytimecli.o b/7.client-server-select/daytimecli.o
new file mode 100644
index 0000000..1b032de
Binary files /dev/null and b/7.client-server-select/daytimecli.o differ
diff --git a/7.client-server-select/daytimesrv.c b/7.client-server-select/daytimesrv.c
new file mode 100644
index 0000000..3f47f3d
--- /dev/null
+++ b/7.client-server-select/daytimesrv.c
@@ -0,0 +1,145 @@
+
+
+#include	"../basic.h"
+#include	<time.h>
+
+void sigchldaction (int signal){
+
+	int status, pid;
+     
+   for (pid = waitpid(-1,&status,WNOHANG);pid > 0;pid = waitpid(-1,&status,WNOHANG)){
+   	// server: child terminated
+   }  
+
+
+}
+
+void sigpipeaction (int signal){
+    
+    //fprintf(stderr, "Sigpipe catturato\n");
+    
+}
+
+typedef struct message {
+	char data[100];
+}t_message;
+
+
+int main(int argc, char **argv) {
+	int			listenfd, connfd, n;
+	struct sockaddr_in	servaddr;
+	
+
+//////////////////////////////////////////////////////////// SIGNALS
+///////SIGCHLD
+struct sigaction sigchldstructure;
+       sigchldstructure.sa_handler = sigchldaction;
+       sigchldstructure.sa_flags = 0;
+          
+sigaction (SIGCHLD, &sigchldstructure, NULL);
+
+///////SIGPIPE
+struct sigaction sigpipestructure;
+    sigpipestructure.sa_handler = sigpipeaction;
+    sigpipestructure.sa_flags = 0;
+    
+sigaction (SIGPIPE, &sigpipestructure, NULL);
+//////////////////////////////////////////////////////////// END SIGNALS
+	
+
+
+	if (argc != 2 ){
+		printf("usage: daytimesrv <porta>\n");
+		exit(0);
+}
+	if( (listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
+		printf("socket error\n");
+		exit(0);
+}
+	bzero(&servaddr, sizeof(servaddr));
+	servaddr.sin_family      = AF_INET;
+	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);   /* wildcard address */
+	servaddr.sin_port        = htons(atoi(argv[1])); /* server port */
+
+	if( (bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr))) < 0){
+		printf("bind error\n"); exit(0);
+}
+	if( listen(listenfd, 5) < 0 )
+		{ printf("listen error\n");
+		  exit(0);
+		}
+		
+	
+	
+	fd_set  fd_set_1;
+	FD_ZERO(&fd_set_1);
+	/*
+	void FD_CLR(int fd, fd_set *set);
+       int  FD_ISSET(int fd, fd_set *set);
+       void FD_SET(int fd, fd_set *set);
+       void FD_ZERO(fd_set *set);
+       */
+	
+	struct timeval timer;
+		timer.tv_sec = 99999999;
+		timer.tv_usec = 0;
+
+
+	
+	for ( ; ; ) {
+		
+		
+		if( (connfd = accept(listenfd, (struct sockaddr *) &client_address_struct, &client_address_struct_size)) < 0)
+		{
+			if(errno == EINTR || errno==ECONNABORTED)
+				continue;
+			printf("accept error\n");
+			exit(1);
+		}
+		
+		int split = fork();
+			
+		if ( split < 0) {
+			printf("fork for iterative server failed\n");
+			exit(-1);
+		}
+		
+		if (split == 0){
+			close(listenfd);
+		
+
+			t_message m;
+			int ready_fds_to_read = 0;
+			
+			FD_set(connfd,&fd_set_1);
+			
+			for (ready_fds_to_read = select( connfd + 1, fd_set_1, NULL,NULL,&timer);
+			     ready_fds_to_read <= 0 ;
+			     ready_fds_to_read = select( connfd + 1, fd_set_1, NULL,NULL,&timer)){
+				
+				if (ready_fds_to_read == -1 && errno == EINTR ){ continue;}
+				if (ready_fds_to_read ==  0) {timer.tv_sec = 99999999;continue;}
+				// write code to inform client that server has an internal error
+				exit(0);
+				
+			}// wait for nonblocking fd in read set
+			
+			 int ridden;
+			 if( FD_ISSET(connfd, fd_set_1) ){
+				for (ridden = read (connfd,&m,sizeof(m)); ridden <= 0;ridden = read (connfd,&m,sizeof(m))){
+					if (errno == EINTR){continue;} else {exit(0);}
+				}
+				
+				fprint(stdout,%s,m.data);
+				
+				
+			 }
+			 
+			 exit(0);
+		
+		
+		}else {
+			close(connfd);
+		}
+	}
+}
diff --git a/7.client-server-select/daytimesrv.c~ b/7.client-server-select/daytimesrv.c~
new file mode 100644
index 0000000..12c17fd
--- /dev/null
+++ b/7.client-server-select/daytimesrv.c~
@@ -0,0 +1,63 @@
+
+
+#include	"../basic.h"
+#include	<time.h>
+
+int main(int argc, char **argv) {
+	int			listenfd, connfd, n;
+	struct sockaddr_in	servaddr;
+	char			buff[INET_ADDRSTRLEN];
+	short			port;
+
+	if (argc != 2 ){
+		printf("usage: daytimesrv <porta>\n");
+		exit(0);
+}
+	if( (listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
+		printf("socket error\n");
+		exit(0);
+}
+	bzero(&servaddr, sizeof(servaddr));
+	servaddr.sin_family      = AF_INET;
+	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);   /* wildcard address */
+	servaddr.sin_port        = htons(atoi(argv[1])); /* server port */
+
+	if( (bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr))) < 0){
+		printf("bind error\n"); exit(0);
+}
+	if( listen(listenfd, 5) < 0 )
+		{ printf("listen error\n");
+		  exit(0);
+		}
+
+	struct sockaddr_in	client_addr;
+	unsigned int client_addr_len = sizeof(client_addr);
+	
+	struct sockaddr_in	server_local_addr;
+	unsigned int server_local_addr_len = sizeof(server_local_addr);
+	
+	char * socket_buffer = (char *) malloc (server_local_addr_len) ;
+	
+	
+
+	for ( ; ; ) {
+		if( (connfd = accept(listenfd, (struct sockaddr *) &client_addr, &client_addr_len)) < 0)
+		{ printf("accept error\n");
+		exit(0);
+		} 
+
+		inet_ntop(AF_INET, &(client_addr.sin_addr), buff, INET_ADDRSTRLEN);// get client ip
+		port = ntohs(client_addr.sin_port);// get client port
+		
+		fprintf (stdout,"%s%c%hu\n",buff,':',port);
+		
+		
+		
+		getsockname (connfd, (struct sockaddr *) &server_local_addr, &server_local_addr_len);
+		memcpy (socket_buffer, &server_local_addr, server_local_addr_len);
+		write (connfd,socket_buffer, server_local_addr_len);
+		
+		
+		close(connfd);
+	}
+}
diff --git a/7.client-server-select/daytimesrv.o b/7.client-server-select/daytimesrv.o
new file mode 100644
index 0000000..d378ae7
Binary files /dev/null and b/7.client-server-select/daytimesrv.o differ
diff --git a/7.client-server-select/makefile b/7.client-server-select/makefile
new file mode 100644
index 0000000..a9beab6
--- /dev/null
+++ b/7.client-server-select/makefile
@@ -0,0 +1,14 @@
+CC = gcc
+CFLAGS =
+all : server client
+
+server : daytimesrv.o ../fun-corso-reti.o
+	$(CC)  -o server daytimesrv.o ../fun-corso-reti.o $(CFLAGS)
+client : daytimecli.o ../fun-corso-reti.o
+	$(CC)  -o client daytimecli.o ../fun-corso-reti.o $(CFLAGS)
+daytimesrv.o : daytimesrv.c ../basic.h
+	$(CC) -c  -o daytimesrv.o daytimesrv.c $(CFLAGS)
+fun-corso-reti.o : ../fun-corso-reti.c ../basic.h
+	$(CC) -c  -o ../fun-corso-reti.o ../fun-corso-reti.c $(CFLAGS)
+daytimecli.o : daytimecli.c ../basic.h
+	$(CC) -c -o daytimecli.o daytimecli.c $(CFLAGS)
diff --git a/7.client-server-print-ip-port-both/makefile b/7.client-server-select/makefile~
similarity index 94%
rename from 7.client-server-print-ip-port-both/makefile
rename to 7.client-server-select/makefile~
index 16fdd6d..ed76715 100644
--- a/7.client-server-print-ip-port-both/makefile
+++ b/7.client-server-select/makefile~
@@ -1,4 +1,3 @@
-all : server client
 server : daytimesrv.o ../fun-corso-reti.o
 	gcc -o server daytimesrv.o ../fun-corso-reti.o
 client : daytimecli.o ../fun-corso-reti.o
diff --git a/7.client-server-select/readme b/7.client-server-select/readme
new file mode 100644
index 0000000..6177b8c
--- /dev/null
+++ b/7.client-server-select/readme
@@ -0,0 +1,2 @@
+il server attende una connessione dal client e stampa ip e porta del client
+il client si connette al server e stampa ip e porta del server
diff --git a/7.client-server-select/readme~ b/7.client-server-select/readme~
new file mode 100644
index 0000000..e69de29
diff --git a/7.client-server-select/server b/7.client-server-select/server
new file mode 100755
index 0000000..833ba65
Binary files /dev/null and b/7.client-server-select/server differ
diff --git a/7.client-server_recursive/makefile b/7.client-server_recursive/makefile
index 16fdd6d..a9beab6 100644
--- a/7.client-server_recursive/makefile
+++ b/7.client-server_recursive/makefile
@@ -1,9 +1,14 @@
+CC = gcc
+CFLAGS =
 all : server client
+
 server : daytimesrv.o ../fun-corso-reti.o
-	gcc -o server daytimesrv.o ../fun-corso-reti.o
+	$(CC)  -o server daytimesrv.o ../fun-corso-reti.o $(CFLAGS)
 client : daytimecli.o ../fun-corso-reti.o
-	gcc -o client daytimecli.o ../fun-corso-reti.o
+	$(CC)  -o client daytimecli.o ../fun-corso-reti.o $(CFLAGS)
 daytimesrv.o : daytimesrv.c ../basic.h
-	gcc -c -o daytimesrv.o daytimesrv.c
+	$(CC) -c  -o daytimesrv.o daytimesrv.c $(CFLAGS)
 fun-corso-reti.o : ../fun-corso-reti.c ../basic.h
-	gcc -c -o ../fun-corso-reti.o ../fun-corso-reti.c
+	$(CC) -c  -o ../fun-corso-reti.o ../fun-corso-reti.c $(CFLAGS)
+daytimecli.o : daytimecli.c ../basic.h
+	$(CC) -c -o daytimecli.o daytimecli.c $(CFLAGS)
diff --git a/9.client-server-echo/makefile b/9.client-server-echo/makefile
index 3a00e69..a9beab6 100644
--- a/9.client-server-echo/makefile
+++ b/9.client-server-echo/makefile
@@ -1,6 +1,14 @@
-server : echosrv.o ../fun-corso-reti.o
-	gcc -o server echosrv.o ../fun-corso-reti.o
-echosrv.o : echosrv.c ../basic.h
-	gcc -c -o echosrv.o echosrv.c
+CC = gcc
+CFLAGS =
+all : server client
+
+server : daytimesrv.o ../fun-corso-reti.o
+	$(CC)  -o server daytimesrv.o ../fun-corso-reti.o $(CFLAGS)
+client : daytimecli.o ../fun-corso-reti.o
+	$(CC)  -o client daytimecli.o ../fun-corso-reti.o $(CFLAGS)
+daytimesrv.o : daytimesrv.c ../basic.h
+	$(CC) -c  -o daytimesrv.o daytimesrv.c $(CFLAGS)
 fun-corso-reti.o : ../fun-corso-reti.c ../basic.h
-	gcc -c -o ../fun-corso-reti.o ../fun-corso-reti.c
+	$(CC) -c  -o ../fun-corso-reti.o ../fun-corso-reti.c $(CFLAGS)
+daytimecli.o : daytimecli.c ../basic.h
+	$(CC) -c -o daytimecli.o daytimecli.c $(CFLAGS)