LinuxÉ豸ģÐÍÖ®input×ÓϵͳÏê½â(¶þ)

;           break; 
         } 
  
         if (type != EV_SYN) 
                   dev->sync = 0; 
  
         if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) 
                   dev->event(dev, type, code, value); 
  
         if (disposition & INPUT_PASS_TO_HANDLERS) 
                   input_pass_event (dev, type, code, value); 
} 
ÔÚÕâÀï,ÎÒÃǺöÂÔµô¾ßÌåʼþµÄ´¦Àí.µ½×îºó,Èç¹û¸ÃʼþÐèÒªinput deviceÀ´Íê³ÉµÄ,¾Í»á½«dispositionÉèÖóÉINPUT_PASS_TO_DEVICE.Èç¹ûÐèÒªhandlerÀ´Íê³ÉµÄ,¾Í½«dispostionÉèΪINPUT_PASS_TO_DEVICE.Èç¹ûÐèÒªÁ½Õ߶¼²ÎÓë,½«dispositionÉèÖÃΪINPUT_PASS_TO_ALL. 
ÐèÒªÊäÈëÉ豸²ÎÓëµÄ,»Øµ÷É豸µÄeventº¯Êý.Èç¹ûÐèÒªhandler²ÎÓëµÄ.µ÷ÓÃinput_pass_event().´úÂëÈçÏÂ: 
static void input_pass_event(struct input_dev *dev, 
                                 unsigned int type, unsigned int code, int value) 
{ 
         struct input_handle *handle; 
  
         rcu_read_lock(); 
  
         handle = rcu_dereference(dev->grab); 
         if (handle)