Server / Client workflow with socket in C - c

Question

I'm starting to learn unix basics at college, i've got an exercise which says something like:"build a client/server application in C in which: the server (tcp socket) print the ip of the client and the text given, and and it shutdown when receives "exit" as string from the client.
Now I've got conceptual problems, i've written these two C program (ignoring for now the text thing...)which i start in two different linux terminal, but the client do nothing, and the server got stuck. I don't understand the whole address thing, what should i put in there (in client)?
Long story short: I cannot establish a simple connection
SERVER
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
int main (void){
struct sockaddr_in mio_indirizzo;
mio_indirizzo.sin_family= AF_INET;
mio_indirizzo.sin_port=htons(5200);
mio_indirizzo.sin_addr.s_addr = htonl(INADDR_ANY);
int fd = socket(PF_INET,SOCK_STREAM,0);
if (fd<0) perror("socket"),exit(1);
int b=bind(fd,(struct sockaddr *)&mio_indirizzo,sizeof(mio_indirizzo));
if(b<0) perror("bind"),exit(-1);
if((listen(fd,5))<0) perror("listen"),exit(-1);
while(1){
struct sockaddr indirizzo_client;
int fd2=accept(fd, &indirizzo_client,NULL);
if (fd2<0) perror("accept"),exit(-1);
printf("connection accepted\n");
close(fd2);
}
close(fd);
shutdown(fd,SHUT_RDWR);
}
CLIENT
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
int main (void){
int fd;
struct sockaddr_in mio_indirizzo;
mio_indirizzo.sin_family = AF_INET;
mio_indirizzo.sin_port = htons(5200);
inet_aton("Putted here the IP of my machine", &mio_indirizzo.sin_addr);
fd = socket(PF_INET, SOCK_STREAM, 0); // crea un socket
connect(fd, (struct sockaddr *) &mio_indirizzo, sizeof(mio_indirizzo)); // crea la connessione
close(fd); // chiude il socket
}

Answer 1

In your server, for accept():
struct sockaddr indirizzo_client;
int len = sizeof(indirizzo_client);
int fd2=accept(fd, &indirizzo_client, &len);
But actually, your program will just print "connection accepted" and quit. You may use select or threads to communicate between the client and the server.