Помогите найти ошибку в следующем коде!!!

   do{                                                                                                                                          
        fd_set rfds;    FD_ZERO (&rfds);    FD_SET (port->fd, &rfds);                                                                            
        tv.tv_sec=0;    tv.tv_usec=ITER_WAIT_TIME;                                                                                               
        int intr=0;                                                                                                                              
                                                                                                                                                 
        switch(select(port->fd+1, &rfds, NULL, NULL, &tv))                                                                                       
        {                                                                                                                                        
          case  1: bytes_readed=(size>14)?read(port->fd,buff,14):read(port->fd,buff,size);
                                                       
                   if(errno==EINTR){time_req+=ITER_WAIT_TIME; intr++;};                                                                          
                   switch(bytes_readed)                                                                                                          
                   {                                                                                                                             
                        case -1: if(errno!=EINTR){syslog(LOG_ERR,"can't read port %s : %s",port->name,strerror(errno));return -1;}; break;       
                        case  0: break;                                                                                                          
                        default: buff+=bytes_readed;  size-=bytes_readed;  break;                                                                
                   };                                                                                                                            
                   break;                                                                                                                        
          case  0: break;                                                                                                                        
          case -1: if(errno!=EINTR){syslog(LOG_ERR,"ERROR read port %s : %s",port->name,strerror(errno));return -1;}                             
                   else {time_req+=ITER_WAIT_TIME; intr++;};                                                                                     
                   break;                                                                                                                        
          default: syslog(LOG_ERR,"unexpected ERROR while read port %s : %s",port->name,strerror(errno));return -1;  break;                      
        };                                                                                                                                       
                                                                                                                                                 
        gettimeofday(&time_cur,NULL);                                                                                                            
        time_out=(time_cur.tv_sec-time_start.tv_sec)*1000000+(time_cur.tv_usec-time_star
t.tv_usec);                                              
                                                                                                                                                 
    }while((time_out<time_req) && (size>0) && !((time_out>ITER_WAIT_TIME) && (intr==0)  && (size==answer_size)));