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What is Socket Programming?

According to our Socket Programming experts at C Assignment, one way to get two data transfer systems, based on TCP / IP protocol, is socket programming. A socket is not just a “connection channel” between two programs running on different computers or on one computer.

From an editorial standpoint, a socket is not just a specially opened “file”. Once opened, data can be written and read in the common language C which reads tasks () and writes () tasks.

There are two types of “communication channels” or sockets, focusing on the connection and the offline.

In the first case, both systems must communicate with the socket and until the connection is properly established, neither of them can transfer data. This is the TCP port of the TCP / IP protocol, and ensures that all data will be transferred from one system to another correctly. Used when information to be transmitted is important, no data can be lost and it does not matter if the programs are “blocked” pending or transferring data. If one of the programs is too busy and does not connect to the system, the other will be blocked until the first one reads or writes the data.

In the second case, the programs do not need to connect. One of them can transfer data at any time, whether the other system is “listening” or not. This is what is called the UDP protocol, and it ensures that incoming data is correct, but does not guarantee that it will all come. Used when the system should not be trapped and it does not matter if the data is lost.

For example, consider a system that controls the temperature in the oven and sends that temperature to a computer in the controller to display temperature graphs. Oven control is more important than complete graphics refinement. The system can’t stick without going to the oven just because the computer displaying graphics is busy with something else.

Unix / Linux files included

C Provisioning Service Experts explain that No files are strictly required for configuring sockets. Knowing the IP address and service number, is coded and everything is resolved. However, this is not very comfortable or portable from one computer to another.

There are two files in UNIX / LINUX that support this function, although you must have root permissions to modify them. These files can be the size of a phone book, in one case we have a company name and its phone number and in another file a person’s name and extension (EmpresaGorda, tlfn 123.456.789; JoseGordo, extension 2245; …)

/ Etc / Hosts: This is a directory where we have companies and their telephone numbers. In this file, there is a list of computer names that are connected to the network and the IP address of each. Usually, to the client / etc. / holds the server name and its IP address is usually set. Then, from the system, a call is made to the gethostbyname () function, where transferring a computer name as a series of letters, returns the data structure including the IP address.

One line of possibilities for this file is the following, where we identify the IP address and computer name that we provide the Quake service.

For Windows, this file is usually found in the C: \ WINNT \ system32 \ drivers \ etc \ host.

/ etc / services: This file is the equivalent of an index where we have different departments / individuals of the company and their phone numbers included. In this file is a list of available services, indicating service name, service number and type (FTP / UDP).

Both the server and the client must be in the file to which they are going / requesting the same number and type of service. The name may be different, as everyone in his system puts the word he wants, but it is rare.

From the system, both the client and the server must call the getervbyname () function, where the transfer of the service name, returns the data structure including the service number and type.

An example of what might appear in a file / etc / services is as follows, where we see in each line a service name, number / type and optional comment after the # sign. “Luckily”, you see the service www, its number of service known to all computers on the Internet is 80.

For Windows, the yore file is in C: \ WINNT \ system32 \ driver \ etc \ services

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