Пример #1
0
/*
 *  main()
 */
extern int main(int argc, char** argv) {

   int                handle_port = 0;
   cl_com_handle_t*   handle      = NULL; 
   cl_com_message_t*  message     = NULL;
   cl_com_endpoint_t* sender      = NULL;
   int                i           = 0;
 
 
   /* check command line argument count */
   if (argc != 2) {
      usage();
      exit(1);
   }
 
   /* get server port from command line */
   handle_port = atoi(argv[1]);
   if (handle_port <= 0) {
      fprintf(stderr,"need a port number > 0\n");
      usage();
      exit(1);
   }
 
 
   /* setup signalhandling */
   setup_signal_handler();
 
   /* setup commlib */
   cl_com_setup_commlib(CL_RW_THREAD, CL_LOG_WARNING, on_communication_log);
 
   /* setup commlib error function callback */
   cl_com_set_error_func(on_communication_error);
 
   /* create communication handle */
   handle=cl_com_create_handle(NULL, 
                               CL_CT_TCP, 
                               CL_CM_CT_MESSAGE,
                               true,
                               handle_port,
                               CL_TCP_DEFAULT,
                               "server", 1,
                               1, 0 );
 
   if (handle == NULL) {
      fprintf(stderr, "could not create communication handle\n");
      cl_com_cleanup_commlib();
      exit(1);
   }
 
   /* print out some info output */
   printf("server running:\n");
   printf("host: \"%s\"\n", handle->local->comp_host);
   cl_com_get_service_port(handle,&i);
   printf("port: %d\n",     i);
   printf("name: \"%s\"\n", handle->local->comp_name);
   printf("id:   %ld\n",    handle->local->comp_id);
     
   /* application main loop */
   while(do_shutdown != 1) {
 
      cl_commlib_trigger(handle, 1);
 
      cl_commlib_receive_message(handle,NULL, NULL, 0, false, 0, &message, &sender);
 
      if (message != NULL) {
         char response_message[1024];
         sprintf(response_message,"Welcome to demo service at host \"%s\"!", handle->local->comp_host);
         printf("received message from \"%s/%s/%ld\": %s\n", sender->comp_host, sender->comp_name, sender->comp_id, message->message);
 
         cl_commlib_send_message(handle, 
                                 sender->comp_host, 
                                 sender->comp_name, 
                                 sender->comp_id, CL_MIH_MAT_NAK,  
                                 (cl_byte_t**)&response_message, 
                                 strlen(response_message)+1, 
                                 NULL, 0, 0, 
                                 true,false);
         message->message = NULL;
         cl_com_free_message(&message);
         cl_com_free_endpoint(&sender);
         message = NULL;
      }
   }

   printf("shutting down ...\n");

   /* here the application goes down - shutdown communication lib */
   while ( cl_commlib_shutdown_handle(handle, true) == CL_RETVAL_MESSAGE_IN_BUFFER) {
      message = NULL;
      cl_commlib_receive_message(handle,NULL, NULL, 0, false, 0, &message, &sender);
 
      if (message != NULL) {
         printf("ignoring message from \"%s\"\n", sender->comp_host); 
         cl_com_free_message(&message);
         cl_com_free_endpoint(&sender);
         message = NULL;
      }
   }
 
   /* cleanup commlib */
   cl_com_cleanup_commlib();

  return 0;
}
extern int main(int argc, char** argv)
{
  struct sigaction sa;


  cl_com_handle_t* handle = NULL; 
  cl_com_message_t* message = NULL;
  cl_com_endpoint_t* sender = NULL;
#if 0
  cl_com_endpoint_t* clients[10] = { NULL, NULL, NULL, NULL, NULL,
                                     NULL, NULL, NULL, NULL, NULL };
#endif
  int i;
  unsigned long max_connections;
  
  if (argc != 4) {
      printf("please enter  debug level, port and nr. of max connections\n");
      exit(1);
  }

  /* setup signalhandling */
  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = sighandler_server;  /* one handler for all signals */
  sigemptyset(&sa.sa_mask);
  sigaction(SIGINT, &sa, NULL);
  sigaction(SIGTERM, &sa, NULL);
  sigaction(SIGHUP, &sa, NULL);
  sigaction(SIGPIPE, &sa, NULL);


  printf("commlib setup ...\n");
  cl_com_setup_commlib(CL_RW_THREAD, (cl_log_t)atoi(argv[1]), NULL);

  printf("setting up service on port %d\n", atoi(argv[2]) );
  handle=cl_com_create_handle(NULL,CL_CT_TCP,CL_CM_CT_MESSAGE , CL_TRUE, atoi(argv[2]) , CL_TCP_DEFAULT,"server", 1, 2, 0 );
  if (handle == NULL) {
     printf("could not get handle\n");
     exit(-1);
  }

  cl_com_get_service_port(handle,&i), 
  printf("server running on host \"%s\", port %d, component name is \"%s\", id is %ld\n", 
         handle->local->comp_host, 
         i, 
         handle->local->comp_name,  
         handle->local->comp_id);

  cl_com_set_max_connections(handle,atoi(argv[3]));
  cl_com_get_max_connections(handle,&max_connections);
  printf("max open connections is set to %lu\n", max_connections);

  printf("enable max connection close\n");
  cl_com_set_max_connection_close_mode(handle, CL_ON_MAX_COUNT_CLOSE_AUTOCLOSE_CLIENTS);

  while(do_shutdown != 1) {
     unsigned long mid;
     int ret_val;
     struct timeval now;
     

     CL_LOG(CL_LOG_INFO,"main()");

     gettimeofday(&now,NULL);
     cl_commlib_trigger(handle, 1);
     ret_val = cl_commlib_receive_message(handle,NULL, NULL, 0, CL_FALSE, 0, &message, &sender);
     if (message != NULL ) {
        ret_val = cl_commlib_send_message(handle, 
                                sender->comp_host, 
                                sender->comp_name, 
                                sender->comp_id, CL_MIH_MAT_NAK,  
                                &message->message, 
                                message->message_length, 
                                &mid, message->message_id,0, 
                                CL_FALSE, CL_FALSE);
        if (ret_val != CL_RETVAL_OK) {
/*
           printf("cl_commlib_send_message() returned: %s\n",cl_get_error_text(ret_val));
*/
        } 
        

/*        printf("received message from \"%s\": size of message: %ld\n", sender->comp_host, message->message_length); */

        cl_com_free_message(&message);
        cl_com_free_endpoint(&sender);
        message = NULL;
     } 
  }


  cl_com_ignore_timeouts(CL_TRUE); 
  cl_com_get_ignore_timeouts_flag();

  printf("shutting down server ...\n");
  handle = cl_com_get_handle( "server", 1 );
  if (handle == NULL) {
     printf("could not find handle\n");
     exit(1);
  } else {
     printf("found handle\n");
  }

  while ( cl_commlib_shutdown_handle(handle, CL_TRUE) == CL_RETVAL_MESSAGE_IN_BUFFER) {
     message = NULL;
     cl_commlib_receive_message(handle, NULL, NULL, 0, CL_FALSE, 0, &message, &sender);

     if (message != NULL) {
        printf("ignoring message from \"%s\": size of message: %ld\n", sender->comp_host, message->message_length); 
        cl_com_free_message(&message);
        cl_com_free_endpoint(&sender);
        message = NULL;
     } else {
        break;
     }
  }

  printf("commlib cleanup ...\n");
  cl_com_cleanup_commlib();
  
  printf("main done\n");
  return 0;
}
extern int main(int argc, char** argv)
{
    struct sigaction sa;
    static int runs = 100;


    cl_com_handle_t* handle = NULL;
    cl_com_message_t* message = NULL;
    cl_com_endpoint_t* sender = NULL;

    int bytes_received = 0;
    unsigned long total_bytes_sent = 0;
    unsigned long total_bytes_received = 0;
    unsigned long total_connections = 0;
    unsigned long total_connection_sum = 0;
#if 1
    char* welcome_text = "Welcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\nWelcome to the tcp framework module!Welcome to the tcp framework module!Welcome to the tcp framework module!\n";
#else
    char* welcome_text = "This message is from thread 1";
#endif

    struct timeval now;
    long start_time;
    long appl_start_time;
    long end_time;
    int retval = CL_RETVAL_PARAMS;
    int welcome_text_size;
    int close_connection = 0;
    unsigned long last_mid = 0;
    int i;
    cl_framework_t framework = CL_CT_TCP;
    cl_xml_connection_autoclose_t autoclose;

    /* setup signalhandling */
    memset(&sa, 0, sizeof(sa));
    sa.sa_handler = sighandler_client;  /* one handler for all signals */
    sigemptyset(&sa.sa_mask);
    sigaction(SIGINT, &sa, NULL);
    sigaction(SIGTERM, &sa, NULL);
    sigaction(SIGHUP, &sa, NULL);
    sigaction(SIGPIPE, &sa, NULL);


    if (argc < 7) {
        printf("wrong parameters, param1 = server host, param2 = port number, param3 = client id, param4=debug_level, param5=sleep time, param6=do_close, [param7=framework(TCP/SSL)]\n");
        exit(1);
    }
    prof_mt_init();
    cl_com_setup_commlib(CL_NO_THREAD, (cl_log_t)atoi(argv[4]), NULL);
    if (atoi(argv[6]) != 0) {
        close_connection = 1;
    }
    if (argv[7]) {
        framework = CL_CT_UNDEFINED;
        if (strcmp(argv[7], "TCP") == 0) {
            framework=CL_CT_TCP;
            printf("using TCP framework\n");
        }
        if (strcmp(argv[7], "SSL") == 0) {
            framework=CL_CT_SSL;
            printf("using SSL framework\n");
        }
        if (framework == CL_CT_UNDEFINED) {
            printf("unexpected framework type\n");
            exit(1);
        }
    }

    cl_com_set_alias_file("./alias_file");
    if ( framework == CL_CT_SSL) {
        cl_ssl_setup_t ssl_config;
        ssl_config.ssl_method           = CL_SSL_v23;                 /*  v23 method                                  */
        ssl_config.ssl_CA_cert_pem_file = getenv("SSL_CA_CERT_FILE"); /*  CA certificate file                         */
        ssl_config.ssl_CA_key_pem_file  = NULL;                       /*  private certificate file of CA (not used)   */
        ssl_config.ssl_cert_pem_file    = getenv("SSL_CERT_FILE");    /*  certificates file                           */
        ssl_config.ssl_key_pem_file     = getenv("SSL_KEY_FILE");     /*  key file                                    */
        ssl_config.ssl_rand_file        = getenv("SSL_RAND_FILE");    /*  rand file (if RAND_status() not ok)         */
        ssl_config.ssl_crl_file         = getenv("SSL_CRL_FILE");     /*  revocation list file                        */
        ssl_config.ssl_reconnect_file   = NULL;                       /*  file for reconnect data    (not used)       */
        ssl_config.ssl_refresh_time     = 0;                          /*  key alive time for connections (not used)   */
        ssl_config.ssl_password         = NULL;                       /*  password for encrypted keyfiles (not used)  */
        ssl_config.ssl_verify_func      = NULL;                       /*  function callback for peer user/name check  */

        if (ssl_config.ssl_CA_cert_pem_file == NULL ||
                ssl_config.ssl_cert_pem_file    == NULL ||
                ssl_config.ssl_key_pem_file     == NULL ||
                ssl_config.ssl_rand_file        == NULL) {
            printf("please set the following environment variables:\n");
            printf("SSL_CA_CERT_FILE         = CA certificate file\n");
            printf("SSL_CERT_FILE            = certificates file\n");
            printf("SSL_KEY_FILE             = key file\n");
            printf("(optional) SSL_RAND_FILE = rand file (if RAND_status() not ok)\n");
        }
        cl_com_specify_ssl_configuration(&ssl_config);
    }
    CL_LOG_STR(CL_LOG_INFO,"connection to server on host", argv[1]);
    CL_LOG_INT(CL_LOG_INFO,"using port",atoi(argv[2]));

    CL_LOG_STR(CL_LOG_INFO,"component is","client");
    CL_LOG_INT(CL_LOG_INFO,"id ist",atoi(argv[3]));
#define SELECT_TIMEOUT 1
#if 0
#define CREATE_SERVICE
#endif

#ifdef CREATE_SERVICE
    cl_com_append_known_endpoint_from_name(argv[1], "server", 1,atoi(argv[2]),CL_CM_AC_DISABLED , 1);
    handle=cl_com_create_handle(NULL,framework,CL_CM_CT_MESSAGE , CL_TRUE, 0 , CL_TCP_DEFAULT, "client", atoi(argv[3]),SELECT_TIMEOUT,0 );
    if (handle == NULL) {
        printf("could not get handle\n");
        exit(1);
    } else {
        int my_port;
        cl_com_get_service_port(handle,&my_port);
        printf("I'm reachable at port %d!\n", my_port);
    }
#else
    handle=cl_com_create_handle(NULL,framework,CL_CM_CT_MESSAGE , CL_FALSE, atoi(argv[2]) , CL_TCP_DEFAULT,"client", atoi(argv[3]),SELECT_TIMEOUT,0 );
    if (handle == NULL) {
        printf("could not get handle\n");
        exit(1);
    }
#endif

    cl_com_set_auto_close_mode(handle,CL_CM_AC_ENABLED );
    cl_com_get_auto_close_mode(handle,&autoclose);
    if (autoclose != CL_CM_AC_ENABLED ) {
        printf("could not enable autoclose\n");
        exit(1);
    }

    printf("local hostname is \"%s\"\n", handle->local->comp_host);
    printf("local component is \"%s\"\n", handle->local->comp_name);
    printf("local component id is \"%ld\"\n", handle->local->comp_id);

#ifdef CREATE_SERVICE
    cl_com_get_known_endpoint_port_from_name(argv[1], "server", 1, &i);
    printf("connecting to port \"%d\" on host \"%s\"\n", i, argv[1]);
#else
    cl_com_get_connect_port(handle, &i);
    printf("connecting to port \"%d\" on host \"%s\"\n", i, argv[1]);
#endif


    gettimeofday(&now,NULL);
    start_time =    now.tv_sec;
    appl_start_time = start_time;
    welcome_text_size = strlen(welcome_text) + 1;

    if (getenv("CL_RUNS")) {
        runs = atoi(getenv("CL_RUNS"));
    } else {
        runs = -1;  /* disable runs shutdown */
    }
    while(do_shutdown != 1) {
        unsigned long mid = 0;
        int my_sent_error = 0;

        CL_LOG(CL_LOG_INFO,"main loop");
        if (runs > 0) {
            runs--;
        }

        /* printf("sending to \"%s\" ...\n", argv[1]);  */

        /*     CL_LOG(CL_LOG_ERROR,"sending ack message ..."); */

        my_sent_error = cl_commlib_send_message(handle, argv[1], "server", 1, CL_MIH_MAT_ACK, (cl_byte_t**)&welcome_text , welcome_text_size, &mid ,0,0, CL_TRUE, CL_FALSE);
        if ( retval == CL_RETVAL_CONNECTION_NOT_FOUND ) {
            CL_LOG(CL_LOG_ERROR,"after new connection");
        }

        if (last_mid >= mid || mid == 1) {
            total_connections++;
            total_connection_sum++;
        }
        last_mid = mid;

#if 1
        if (my_sent_error != CL_RETVAL_OK) {
            printf("cl_commlib_send_message() returned %s\n", cl_get_error_text(my_sent_error));
#ifdef CREATE_SERVICE
            cl_com_get_known_endpoint_port_from_name(argv[1], "server", 1, &i);
            printf("connecting to port \"%d\" on host \"%s\"\n", i, argv[1]);
#else
            cl_com_get_connect_port(handle, &i);
            printf("connecting to port \"%d\" on host \"%s\"\n", i, argv[1]);
#endif

            /* exit(1); */
#if CL_DO_SLOW
            sleep(atoi(argv[5]));
#endif
            cl_commlib_trigger(handle,1);
            continue;
        }
#endif
#if 1
        retval = CL_RETVAL_PARAMS;
        while (retval != CL_RETVAL_OK ) {


            while ( (retval=cl_commlib_receive_message(handle,NULL, NULL, 0, CL_FALSE, 0, &message, &sender)) == CL_RETVAL_OK) {
                if (message != NULL) {
                    cl_com_free_endpoint(&sender);
                    cl_com_free_message(&message);
                } else {
                    break;
                }
            }

            if ( retval == CL_RETVAL_CONNECTION_NOT_FOUND ) {
                CL_LOG(CL_LOG_ERROR,"connection not found (1)");
                break;
            }

            retval = cl_commlib_check_for_ack(handle, argv[1], "server", 1, mid, CL_TRUE );
            if (retval != CL_RETVAL_MESSAGE_WAIT_FOR_ACK && retval != CL_RETVAL_OK) {
                printf("retval of cl_commlib_check_for_ack(%ld) is %s\n",mid,cl_get_error_text(retval));
                /* exit(1);  */
                break;
            }
            if (retval == CL_RETVAL_OK) {
                CL_LOG_INT(CL_LOG_INFO,"received ack for message mid", (int)mid);
            } else {
                cl_commlib_trigger(handle, 1);
            }

            if ( retval == CL_RETVAL_CONNECTION_NOT_FOUND ) {
                CL_LOG(CL_LOG_ERROR,"connection not found (2)");
                break;
            }



            /*        printf("retval of cl_commlib_check_for_ack(%ld) is %s\n",mid,cl_get_error_text(retval));  */
        }
        if (retval == CL_RETVAL_CONNECTION_NOT_FOUND) {
            cl_commlib_trigger(handle, 1);
            continue;
        }
#endif


        total_bytes_sent  = total_bytes_sent + welcome_text_size;
        CL_LOG_INT(CL_LOG_INFO,"bytes sent:", welcome_text_size);

        bytes_received = 0;
        while (bytes_received != welcome_text_size ) {

            cl_commlib_trigger(handle, 1);


            CL_LOG_INT(CL_LOG_INFO,"waiting for mid .... ", (int)mid);
            retval = cl_commlib_receive_message(handle,NULL, NULL, 0, CL_FALSE, mid, &message, &sender);


            CL_LOG_STR(CL_LOG_INFO,"waiting for bytes ...", cl_get_error_text(retval));
            if (retval == CL_RETVAL_CONNECTION_NOT_FOUND) {
#if CL_DO_SLOW
                /*           CL_LOG(CL_LOG_ERROR,"connection not found"); */

                if (atoi(argv[5]) > 0) {
                    printf("sleeping...\n");
                    sleep(atoi(argv[5]));
                }
#endif
                break;
            }
            if (message != NULL) {

                /*   printf("received message from \"%s\"\n", sender->comp_host); */
                CL_LOG_INT(CL_LOG_INFO,"bytes received:", (int)message->message_length);
                if (strcmp((char*)message->message, welcome_text) != 0) {
                    printf("------------------------> message transfer error\n");
                }
                total_bytes_received = total_bytes_received + message->message_length;
                bytes_received = bytes_received + (int)message->message_length;
                cl_com_free_endpoint(&sender);
                cl_com_free_message(&message);
            }

            while ( (retval = cl_commlib_receive_message(handle,NULL, NULL, 0, CL_FALSE, 0, &message, &sender)) == CL_RETVAL_OK) {
                if (message != NULL) {
                    cl_com_free_endpoint(&sender);
                    cl_com_free_message(&message);
                } else {
                    break;
                }
            }

            if (retval == CL_RETVAL_CONNECTION_NOT_FOUND) {
                CL_LOG(CL_LOG_ERROR,"connection not found (3)");
                break;

            }


#if CL_DO_SLOW
            sleep(atoi(argv[5]));
#endif
            if (do_shutdown == 1) {
                break;
            }
        }


#if CL_DO_SLOW
        sleep(atoi(argv[5]));
#endif
        gettimeofday(&now,NULL);
        end_time =    now.tv_sec;
        if (end_time - start_time >= 2 ) {
            cl_com_connection_t* con = NULL;
            cl_connection_list_elem_t* elem = NULL;
            /*        printf("Kbit/s sent: %.2f   ", ((total_bytes_sent * 8.0)/1024.0) /  (double)(end_time - start_time));
                    printf("Kbit/s read: %.2f   ", ((total_bytes_received * 8.0)/1024.0) /  (double)(end_time - start_time)); */
            printf("KBit/s     : %.2f   ", (((total_bytes_received + total_bytes_sent) * 8.0)/1024.0) /  (double)(end_time - start_time));
            printf("connections/s: %.2f ", (double) total_connections / (double)(end_time - start_time));
            printf("avg. connections/s: %.2f", (double) total_connection_sum / (double)(end_time - appl_start_time));
            cl_raw_list_lock(handle->connection_list);
            elem = cl_connection_list_get_first_elem(handle->connection_list);
            if (elem != NULL) {
                con = elem->connection;
                if (elem->connection->local) {
                    printf("[for comp host, comp name, comp id: \"%s\", \"%s\", \"%ld\"]    \n",con->local->comp_host, con->local->comp_name , con->local->comp_id);
                }
            } else {
                printf("     \n");
            }
            cl_raw_list_unlock(handle->connection_list);


            start_time =    now.tv_sec;
            total_bytes_sent = 0;
            total_bytes_received = 0;
            total_connections = 0;
            fflush(stdout);
        }
        if (close_connection != 0) {

            while (cl_commlib_shutdown_handle(handle, CL_TRUE) == CL_RETVAL_MESSAGE_IN_BUFFER) {
                printf("got message\n");
                message = NULL;
                cl_commlib_receive_message(handle,NULL, NULL, 0, CL_FALSE, 0, &message, &sender);
                if (message != NULL) {
                    cl_com_free_endpoint(&sender);
                    cl_com_free_message(&message);
                } else {
                    printf("error shutdown handle");
                    exit(-1);
                    break;
                }
            }
#ifdef CREATE_SERVICE
            handle=cl_com_create_handle(NULL,framework,CL_CM_CT_MESSAGE , CL_TRUE, 0 , CL_TCP_DEFAULT, "client", atoi(argv[3]),SELECT_TIMEOUT,0 );
            if (handle == NULL) {
                printf("could not get handle\n");
                exit(-1);
            } else {
                int my_port;
                cl_com_get_service_port(handle,&my_port);
                printf("I'm reachable at port %d!\n", my_port);
            }
#else
            handle=cl_com_create_handle(NULL,framework,CL_CM_CT_MESSAGE , CL_FALSE, atoi(argv[2]) , CL_TCP_DEFAULT, "client", atoi(argv[3]), SELECT_TIMEOUT,0 );
            if (handle == NULL) {
                printf("could not get handle\n");
                exit(-1);
            }
#endif
            cl_com_set_auto_close_mode(handle,CL_CM_AC_ENABLED );
            cl_com_get_auto_close_mode(handle,&autoclose);
            if (autoclose != CL_CM_AC_ENABLED ) {
                printf("could not enable autoclose\n");
                exit(1);
            }
        }
        if (runs == 0) {
            do_shutdown = 1;
        }
    }
    printf("do_shutdown received\n");
    fflush(stdout);
    while (cl_commlib_shutdown_handle(handle, CL_TRUE) == CL_RETVAL_MESSAGE_IN_BUFFER) {
        printf("got message\n");
        message = NULL;

        cl_commlib_receive_message(handle,NULL, NULL, 0, CL_FALSE, 0, &message, &sender);
        if (message != NULL) {
            cl_com_free_endpoint(&sender);
            cl_com_free_message(&message);
        } else {
            break;
        }
    }
    printf("cleanup commlib ...\n");
    cl_com_cleanup_commlib();

    printf("main done\n");
    fflush(stdout);
    return 0;
}