There is an instance of a server running already and I need to be able to open two terminals, run…

There is an instance of a server running already and I need to be able to open two terminals, run the client in each and have them communicate with each other. I must use SOCKETS and THREADS, not forks to accomplish this. The first word entered in each terminal should be the user’s name. After that they send messages back and forth. Like this:

Terminal 1 Terminal 2

Joe Cindy

Hi Cindy Joe > Hi Cindy

Cindy > Hi Joe Hi Joe

My client code compiles and connects but but sending and receiving messages doesn’t work the way it needs to.

Here is my client code: Can you help me update my code so that it behaves as described above?


* filename server_ipaddress portno


* argv[0] filename

* argv[1] server_ipaddress

* argv[2] portno










void error(const char *msg)





int main(int argc, char *argv[])


//socket file descriptor, port number, num bytes

int sockfd, portno, n;

struct sockaddr_in serv_addr;

struct hostent *server;

char buffer[256];

//check to see that filename and arguments have been entered properly

if (argc < 3){

fprintf(stderr, “usage %s hostname portn”, argv[0]);



portno = atoi(argv[2]); //convert port number to integer

//create a socket and get a file descritor in sockfd

sockfd = socket(AF_INET, SOCK_STREAM, 0);

//if socket function fails, call error function

if (sockfd < 0)

error(“ERROR opening socket”);

//ip address of server

server = gethostbyname(argv[1]);

//check to see ip address is valid

if(server == NULL){

fprintf(stderr, “Error, no such host”);


//bzero (starting address, num bytes)

bzero((char *) &serv_addr, sizeof(serv_addr));

serv_addr.sin_family = AF_INET;

//bcopy (from, to, num bytes)

bcopy((char *) server -> h_addr, (char *) &serv_addr.sin_addr.s_addr, server -> h_length);

serv_addr.sin_port = htons(portno);

if(connect(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0){

error(“Connection Failed”);




bzero(buffer, 255);

fgets(buffer, 255, stdin);

//write returns num bytes written

n = write(sockfd, buffer, strlen(buffer));

if(n < 0){

error(“Error on write”);


bzero(buffer, 255);

n = read(sockfd, buffer, 255);

if(n < 0){

error(“Error on read”);


printf(“Server: %s”, buffer);

int i = strncmp(“Bye”, buffer, 3);

if(i == 0){





return 0;


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