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The SYN-Flood attack is currently the most common DDoS attack on the network, It is also the most classic denial of service attack. It takes advantage of a defect in the implementation of TCP protocol. By sending a large number of attack messages with forged source addresses to the ports where the network service is located, it may cause the half-open connection queue in the target server to be full, thus preventing other legitimate users from accessing. This kind of attack was discovered as early as 1996, but it still shows great vitality. Many operating systems, even firewalls and routers, cannot effectively defend against this kind of attack, and it is very difficult to trace it because it can easily forge the source address. Its packet characteristics are usually that the source sends a large number of SYN packets and lacks the last handshake ACK reply of the three handshakes.Then you also notice the flag bit FLAG_DISALLOW_INTERCEPT, which seems to affect whether ViewGroup intercepts the event. This flag bit is set through the requestDisallowInterceptTouchEvent () method and is generally used in child views. When the flag bit is set, ViewGroup will not be able to intercept events other than ACTION_DOWN. Why do you say besides ACTION_DOWN? Because the dispatchTouchEvent initializes the state every time it receives ACTION_DOWN, the code is as follows.二十年代的美国处于经济萧条时期，失业率居高不下，工人受尽压榨，成为了大机器生产中的一颗螺丝钉。查理就是一个底层市民，他在一个机器隆隆的厂房里日以继夜地工作，以赚取微薄的收入。重复繁重的工作压得他喘不过气，他把人们的鼻子当成螺丝钉来拧，卷入流水线机器的皮带里，令人哭笑不得。1938年10月，日军攻陷武汉，长沙危在旦夕。城中茶园巷的胡家人，在孙女婿薛君山的主持下，千方百计为胡家最宠爱的一对龙凤胎湘湘和小满安排退路。薛君山先将湘湘介绍给留洋归来保卫长沙的顾清明，可惜生性泼辣的湘湘和心高气傲的顾清明一见面便势同水火，只好另选人家。订婚当日，蒋介石密令火烧长沙，由于指挥失当，长沙大火酿成巨大灾难，繁华的古城毁于一旦，很多睡梦里来不及跑的人被活活烧死，包括湘湘的未婚夫一家。就在这样一片焦土上，各地英雄儿女齐聚长沙，和湖南人民一起艰难地阻挡敌人的铁蹄。Seventeenth to apply for the qualification of a fire control technical service institution, it shall submit the following materials to the fire control institution of the provincial public security organ where the institution is located:不然，犯起病来带累表哥。Later, the battle was the same, and it was fought several times over and over again. The ammunition consumed most of the time. The front of the position was covered with enemy bodies. I remember that after resisting the fifth attack, the Vietnamese army stopped there. It did not launch any new attack for a long time. Until more than 3 pm, the Vietnamese army actually "let dogs bite"! I was so impressed by the way the dog looked, The appearance is about the same as that of the domestic dog in my hometown. But there was no hair all over her body. The two eyes are still very far apart, The key is to run very fast. There was some grass in front of the position, and craters were everywhere bombed by the subsequent shelling. The 152-meter shell was a large crater with a diameter of 5 or 6 meters. However, this kind of "dog" can easily cross one with one jump, and there is no need to slow down in continuous jumping. The speed of impact is definitely not comparable to that of human beings. "