connect function

Original problem: Http://topic.csdn.net/t/20060616/15/4825920.html   Call the tcpclient. Connect function to connect to other machines. I tested the program on a machine. For a machine that cannot be connected at all (physical connection fails), the

For Linux network programming, we all know that UDP is used to send data packets, not connection-oriented protocols, that is, it only sends data packets to the link layer. As for whether it can reach the destination IP address and port, there is no

  The execution process of the connect function is composed of data encapsulated or unblocked by each protocol layer step by step, data Space added when skb_buff is allocated to the struct space. Data is encapsulated in the order of MAC, IP, and

Connect Function Decomposition 1. First, the connect function obtains the remote IP address from the parameter, assigns this address to the corresponding variable of the corresponding sock struct, and sets some other variables in the sock struct,

Conclusion:UDP can call the Connect function.UDP can call the Connect function multiple times. UDP calls the Connect function:Send side: We do not need to specify or specify ports and IP addresses againReceiver: You do not have to use

After queuing the data packet priority, the link layer extracts the data packet to be sent from the header of the queue with the highest priority, and transmits it to the data sending function of the NIC Driver, generally, the name is xxx_hard_xmit (

Development test Environment: virtual machine centos,windows Network debugging assistantNon-blocking mode has 3 uses1. Three-time handshake to do other processing at the same time. Connect takes a round trip time, from a few milliseconds of LAN to a

After checking the upper-layer protocol, the link layer uploads data packets to the corresponding upper-layer protocol layer, which is the IP layer protocol.   After the data arrives at the IP layer, the IP layer needs to check and determine whether

UDP is a non-connected protocol that does not have anything like EOF in TCP. 8.11 UDP's Connect functionasynchronous errors are not backed up to a UDP socket unless the socket is connected. We can actually call connect for the UDP socket, but the

How to implement the Connect function with timeout function Principle:Looking at man connect today, I understand the cause of the mistake:EinprogressThe socket is non-blocking and the connectioncannot be completed immediately. It is possibleTo

Many books that introduce network programming will introduce the connect system call as follows: connect a specified socket on the local machine to a server socket with a specified address. The following is the definition of a connect system

Various protocols have been involved since connect. At present, the TCP/IP protocol is clarified first. First, the structure of TCP (transmit Control Protocol) is matched with the struct:   # Define header_size 64/* maximum header size */   Struct

  Our application is callingSocket ()Function, BIND ()After the function is created, it is created locally.SocketStruct,SockStruct, andSocket,SockThese two structs followINodes and file handles are combinedSocketThe operation set of the specified

When the socket function is used to create a socket, the system creates two socket/sock struct for local data management and organization, and these two data structures will not be transmitted to the network, the struct actually used to carry data

After the skb_buff data packet is transferred from the IP layer to the link layer, the link layer starts to process the data packet.   First, check whether the skb_buff data packet is not in the skb_buff linked list. If the data packet is still in

We mentioned in the previous article that asynchronous errors are not returned to a UDP socket unless the socket is connected. We can actually call connect for the UDP socket, but the result is quite different from the TCP connection: no three

What is socket 　　A socket interface is an API of a TCP/IP network. A socket interface defines many functions or routines. programmers can use it to develop applications on a TCP/IP network. To learn TCP/IP network programming on the internet, you

The "UDP protocol" and "Socket data transfer" are described in the previous article. The UDP protocol differs from the TCP protocol in that it is a non-connected, unreliable transport layer protocol. In UDP socket-based programming, data transfer is

Anyone familiar with JavaScript knows that this in JavaScript does not always point to the current object. this in a function or class is closely related to the object that calls this function and the context environment. For example, if you call an

For example, if you call an object with this in the global scope, the current object's "this" points to window. Javascript provides two methods to change the direction of this. They are call and apply, and of course there are methods implemented