unix network programming volume 1

Interaction of two hosts on the network① find the other host based on IP② data is sent to the application specified by the other party, in order to represent these applications, the concept of port is introduced.Common ports:Wed Port 80MySQL Port 3306Valid Port 0~65535③ defines a communication rule, called a protocol. International organizations define the common protocol TCP/IP protocolLocal loopback address: 127.0.0.1 (IP address If this machine doe

One. Network Card driver Architecture analysis1. Linux Network Subsystem#系统调用接口层Provides a unified way for applications to access the network subsystem.#协议无关层Provides a common way to use the Transport layer protocol.#协议栈的实现Implementing a specific network protocol#设备无关层Common interface for protocol and device-driven com

2.1 Structure of the Network DriverAll Linux network drivers follow common interfaces. The object-oriented method is used in the design.A device is an object (device structure) with its own data and methods. For each deviceWhen the method is called, the first parameter is the device object itself. In this way, you can access yourself.(Similar to this reference during object-oriented

() // connection button { Newconnect (); // request a connection } The newconnect () function is called directly. 5. run the program, run the server program at the same time, enter "localhost" after "host", enter "6666" after "port number", and click "Connect". The effect is as follows. We can see that we have correctly received the data. Because the server and client run on the same machine, I entered "host" as "localhost" here. If you run on different machines, you must enter the correct IP

TCP/IP network programming (transcription note 1) –tcptable of Contents Server Client A better client-side implementation Source: "TCP/IP network Programming"Transcription Both sides of the communication have their own input cache and output cache

From http://www.cnblogs.com/xh831213/archive/2006/02/13/329624.html Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->C # As a language that gathers the expertise of many people, it has great advantages in various aspects, especially network programming. This article will introduce some basic knowledge and methods for

Microsoft's next-generation Internet Development Tool VS. Net was launched nationwide in March. One of the emerging languages C # is accepted and applied by more and more developers.C # As a language that gathers the expertise of many people, it has great advantages in various aspects, especially network programming. This article will introduce some basic knowledge and methods for

port and establishes a data link to transmit the data.Passive Mode disadvantages:Server configuration management is slightly more complex, not conducive to security, the server needs to open a random high port so that clients can connect, so most FTP service software can manually configure the scope of the passive portAdvantages of Passive mode:There is no requirement for the client network environment, but for the service side.Passive Mode client Lo

receipt and transmission of pure streaming data, and only encapsulates HTTP clients. 2) The round-robin algorithm is used to process all events: large tasks are subdivided into small tasks and FIFO is supported. However, during actual operation, it was found that the round-robin algorithm they used was not very perfect. For example, the previous test: continuous sending of large batches of tasks to the program causes the task feedback to get stuck. 3) inter-department communication is difficul

I. Concepts 1,SocketYes connecting to the applicationProgramBridge with network drivers,SocketCreate in the application and establish a relationship with the driver through the binding operation. The network architecture is a kind of adhesive that uses different devices and network systems connected with different

TCP/IP network programming I/O Stream separation semi-closed (1) Theoretical Basis Stream: After fopen is called to open a file, file read/write operations will create a stream, and Socket network communication will also create a stream. A stream is a bridge for data sending and receiving purposes, it is actually the

Java Network programming using socket (1), programmingusing Java supports stream-based communication and packet-based communication, and the first is universal.Create ServerSocket 1.Create ServerSocket ServerSocket serverSocket = new ServerSocket (port ); 2.Listen to the connect Socket socket = serverSocket. ac

Meaning: In short, semantics means meaning. After understanding the meaning of the data, the underlying data can be used more effectively. most information sources usually have no meaning, and users or complex programming commands are required to give specific meanings. For example, a webpage contains the information to be expressed and some associated labels. Semantic Web is an intelligent network

Let's talk about this series-web crawler. Web crawlers are a very important part of the search engine system. They collect web pages and collect information from the Internet. These web pages are used for indexing to provide support for search engines, it determines whether the content of the entire engine system is rich and whether information is real-time. Therefore, its performance directly affects the search engine performance. Basic working principles of Web Crawlers: (

Install (Local Environment: Ubuntu 9.04) Install libpcap before using libpcap 1) download libpcap: http://www.tcpdump.org/release/ 2) install the Libpcap dependency package: $ Sudo apt-Get install flex $ Sudo apt-Get install bison 3) install libpcap $ Unzip $./Configure $ Make $ Sudo make install Programming Use libpcap to obtain available network interfaces, I

Programming | network | When we write web programs, we often judge the validity of a string, such as whether a string is a number, whether it is a valid email address, and so on. If you do not use regular expressions, then the judgment of the program will be very long and error prone, if the use of regular expressions, these judgments is a very easy job. This paper introduces the concept and format of regul

Network Programming for iOS development-1. Basic use of NSURLSession and iosnsurlsession Before learning how to use NSURLSession, I should first learn a good article about NSURLSession, From NSURLConnection to NSURLSession, or a Chinese translation From NSURLConnection to NSURLSession. alternatively, you can directly learn "from NSURLConnection to NSURLSession" w

Android Network Programming Series 1: JavaSecurity JSSE (SSL/TLS), javasecurityjsseAbstractTo:Java Security has been in Java for a long time and is a very important and independent forum. It contains many knowledge points, such as MD5 and DigitalSignature. Android is outside Java Seurity, extended an android. security Package, which provides the KeyChain. It cont

Network Programming in Linux-raw socket (1) Http://soft.zdnet.com.cn/software_zone/2007/1020/568223.shtml We have learned two sockets (sock_stream, sock_dragm) in the network program. In this chapter, we will learn another socket-the original socket (sock_raw ). The original socket can be used to compile functions tha