socket programming in linux c

Embedded Devices Linux
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1

hello
I have made a chat client in linux using socket, and i wish to destroy the connection completely. Following is the relevant portions of the code:

#include
#include
#include
#include
#include
#include
#include
#include
#include

int main()
{
int sock, connected, bytes_recieved , true = 1;
char send_data [1024] , recv_data[1024];

    struct sockaddr_in server_addr,client_addr;    
    int sin_size;
    
    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("Socket");
        exit(1);
    }

    if (setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&true,sizeof(int)) == -1) {
        perror("Setsockopt");
        exit(1);
    }
    
    server_addr.sin_family = AF_INET;         
    server_addr.sin_port = htons(2004);     
    server_addr.sin_addr.s_addr = INADDR_ANY; 
    bzero(&(server_addr.sin_zero),8); 

    if (bind(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr))
                                                                   == -1) {
        perror("Unable to bind");
        exit(1);
    }

    if (listen(sock, 5) == -1) {
        perror("Listen");
        exit(1);
    }
	
printf("

TCPServer Waiting for client on port 2004");
fflush(stdout);

    while(1)
    {  

        sin_size = sizeof(struct sockaddr_in);

        connected = accept(sock, (struct sockaddr *)&client_addr,&sin_size);

        printf("

I got a connection from (%s , %d)",
inet_ntoa(client_addr.sin_addr),ntohs(client_addr.sin_port));

        while (1)
        {
          printf("

SEND (q or Q to quit) : ");
gets(send_data);

          if (strcmp(send_data , "q") == 0 || strcmp(send_data , "Q") == 0)
          {
            send(connected, send_data,strlen(send_data), 0); 
            close(connected);
            break;
          }
           
          else
             send(connected, send_data,strlen(send_data), 0);  

          bytes_recieved = recv(connected,recv_data,1024,0);

          recv_data[bytes_recieved] = '\0';

          if (strcmp(recv_data , "q") == 0 || strcmp(recv_data , "Q") == 0)
          {
            close(connected);
            break;
          }

          else 
          printf("

RECIEVED DATA = %s " , recv_data);
fflush(stdout);
}
}

  close(sock);
  return 0;

}

but the close(sock) doesnot seem to close the destroy the connection completely, because after going to ‘label’ the code is exiting showing the error message

Unable to bind: Address already in use
That is the connection is not happening again. What can the problem be? Thanks in advance.

2

check this out:
http://pirate.shu.edu/~wachsmut/Teaching/CSAS2214/Virtual/Lectures/chat-client-server.html