problem beim versenden an alle clients



  • Hallo Leute,

    ich will einen kleinen Server schreiben der Daten an alle Clients schickt über select. Nur wenn ich mit FD_ISSET teste komme ich nie in den zweig indem ich daten versenden kann. Ich hab wohl etwas übersehen, kann da jmd. mal draufkucken

    gruss der gangster wrapper

    Server

    fd_set master;    // master file descriptor list
      fd_set read_fds;  // temp file descriptor list for select()
      fd_set write_fds; // temp file descriptor list for select()
      struct sockaddr_in myaddr;      // server address
      struct sockaddr_in remoteaddr;  // client address
      int fdmax;         // maximum file descriptor number
      int listener;      // listening socket descriptor
      int newfd;         // newly accept()ed socket descriptor
      int yes=1;         // for setsockopt() SO_REUSEADDR, below
      socklen_t addrlen;
      int i;
    
      FD_ZERO(&master);     // clear the master and temp sets
      FD_ZERO(&write_fds);
      FD_ZERO(&read_fds);
    
      // get the listener
      if ((listener = socket(AF_INET, SOCK_STREAM, 0)) == -1) 
        {
          perror("socket");
          exit(1);
        }
    
      // lose the pesky "address already in use" error message
      if (setsockopt(listener, SOL_SOCKET, SO_REUSEADDR, &yes,
    		 sizeof(int)) == -1) 
        {
          perror("setsockopt");
          exit(1);
        }
      // bind
      myaddr.sin_family = AF_INET;
      myaddr.sin_addr.s_addr = INADDR_ANY;
      myaddr.sin_port = htons(PORT);
      memset(&(myaddr.sin_zero), '\0', 8);
      if (bind(listener, (struct sockaddr *)&myaddr, sizeof(myaddr)) == -1) 
        {
          perror("bind");
          exit(1);
        }
    
      // listen
      if (listen(listener, 10) == -1) 
        {
          perror("listen");
          exit(1);
        }
    
      // add the listener to the master set
      FD_SET(listener, &master);
    
      // keep track of the biggest file descriptor
      fdmax = listener; // so far, it's this one
    
      // main loop
      while(1) 
        {
          read_fds = master; // copy it
          if (select(fdmax+1, &read_fds, &write_fds, NULL, NULL) == -1) 
    	{
    	  perror("select");
    	  exit(1);
    	}
    
          // run through the existing connections looking for data to read
          for(i = 0; i <= fdmax; i++) 
    	{
    	  if (FD_ISSET(i, &read_fds)) 
    	    { // new client connection
    	      if (i == listener) 
    		{
    		  // handle new connections
    		  addrlen = sizeof(remoteaddr);
    		  if ((newfd = accept(listener, (struct sockaddr *)&remoteaddr, &addrlen)) == -1) 
    		    {
    		      perror("accept");
    		    } 
    		  else 
    		    {
    		      FD_SET(newfd, &master); // add to master set
    		      if (newfd > fdmax) 
    			{     // keep track of the maximum
    			  fdmax = newfd;
    			}
    		      cout << "selectserver: new connection from " << inet_ntoa(remoteaddr.sin_addr) 
    			   << " on socket " << newfd << endl;
    		    }
    		}
    	    }
    	  if(FD_ISSET(i, &write_fds))
    	    {// stream data to clients
    	      if(i != listener)  //except server
    		{
    		  char text[] = "hello client\n";
    		  int len;
    		  // handle data from a client
    		  if ( send(i, text, 14, 0) != -1)
    		    {
    		      cout << "error can't send on fd " << i << endl;
    		      cout << "actually send data " << len << endl;
    		    }
    		}
    	    } 
    	}
        }
    

    client

    int sockfd, numbytes;  
        char buf[MAXDATASIZE];
        struct hostent *he;
        struct sockaddr_in their_addr; // connector's address information 
    
        if (argc != 2) {
            fprintf(stderr,"usage: client hostname\n");
            exit(1);
        }
    
        if ((he=gethostbyname(argv[1])) == NULL) {  // get the host info 
            herror("gethostbyname");
            exit(1);
        }
    
        if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
            perror("socket");
            exit(1);
        }
    
        their_addr.sin_family = AF_INET;    // host byte order 
        their_addr.sin_port = htons(PORT);  // short, network byte order 
        their_addr.sin_addr = *((struct in_addr *)he->h_addr);
        memset(their_addr.sin_zero, '\0', sizeof their_addr.sin_zero);
    
        if (connect(sockfd, (struct sockaddr *)&their_addr,
                                              sizeof their_addr) == -1) {
            perror("connect");
            exit(1);
        }
    
        if ((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) == -1) {
            perror("recv");
            exit(1);
        }
    
        buf[numbytes] = '\0';
    
        printf("Received: %s",buf);
    
        close(sockfd);
    
        return 0;
    


  • habs selber geloest


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