int new_fd =0;
new_fd = accept( server_fd, NULL, NULL );
while( 1 ){
// if I am doing read,write here I am able to accept multiple
// requests from one client
// I have also tried accept4() call mentioned inside man
// tried with nc command too.
}

while(1){
int new_fd =0;
new_fd = accept( server_fd, NULL, NULL );
// if I am doing read write here I am able to accept
// only one request with one client
// I thought my client does not work properly
// so I also tried with nc command
// same goes with accept4()
}

while(1){
 int new_fd =0;
 new_fd = accept( server_fd, NULL, NULL );
  if( fork() ==0 ){
    // if I am doing read, write here
    // I am able to accept one request from multiple clients
    // but one client is able to send only one request.
    // tried with accept4() and nc
     close( new_fd );
   }

int socket_fd;
socket_fd = socket( AF_INET, SOCK_STREAM, 0);

// for socaddr_in.port port I have used htons()
// for sockaddr_in.addr I have use inet_pton()
connect(socket_fd(structsockaddr*)&socaddr_in,(socklen_t)
        sizeof(sockaddr_in));

while(1){
 // here where I am using read, write, fflush(), memset() call.
}