Tcp Socket Programming In C



TCP/IP Sockets in C: Practical Guide for Programmers, Second Edition is a quick and affordable way to gain the knowledge and skills needed to develop sophisticated and powerful web-based applications. Within the book, you will find C source code (appears to be ANSI/ISO C) for small functional clients and servers using both the TCP and UDP transports. I've checked the indentation, and whilst it may look slightly confusing the braces appear to be where they should be. By default, TCP sockets are in "blocking" mode. But, could have been better, if you had talked about Socket programming with Unix. Broadcasting, multicasting etc sample codes. Input stream of the client socket will be captured [line 57]. TCP File Transfer Socket Programming in Unix Using C Programming. Socket and ServerSocket classes are used for connection-oriented socket programming and DatagramSocket and DatagramPacket classes are used for connection-less socket programming. This utility will transfer a file between two computers using a TCP port of your choosing. Your web server should. TCP/IP Programming Terms and Concepts Joel Snyder Opus1. The examples in this tutorial will use sockets in the Internet domain using the TCP protocol. It should work on both the Unix (tested under Linux, RedHat 7. I assume that you'd want to be able to write a complete client-server program. If you have a preferred language already, the best place to start with web sockets might be to use the libraries and resources available within the domain where you are already comfortable. When I am trying to initiate a TCP socket request from Linux, there is no response from the FreeBSD system. Net frameworks. 0, and SSL 3. Sockets Programming in C Using UDP Datagrams Below you’ll find the code of a simple server-client program in C using UDP sockets for the transmission. It is important to remember that UDP does not guarantee delivery of packets and order of delivery, so checking is important. Both client-side and server-side SSL/TLS is supported, including the use and verification of digital certificates. Output of Chat Program for TCP/IP chat program for tcp-ip Program Explain. I have two. There are methods Socket. TCP Client Server sample example, that waits for any clients to connect. In this article, we will see how to create a socket and setup a listener server node that starts listening to any messages coming to it via the predefined IP and protocol. Java program to check if a number is Armstrong or not. socket programming server compute numbers sum, Search on socket programming server compute numbers sum TCP/IP program to create a passive socket for use in a TCP. One computer uses Passive mode and listens on a port for a connection from the other computer, which will use Active mode to connect to the first computer via its IP address. UDP is like TCP but doesn't have the reliability that TCP does. Assign a port number to the socket with bind() 3. Here, we'll briefly look at an example using connectionless sockets over UDP/IP. Introduction to Sockets A generic Client-Server application Programming Client-Server in C Programming Client-Server in Java. Before start learning socket programming make sure you already have certain basic knowledge to network such as understand what is IP address, TCP, UDP. Create a socket 2. A network socket is an internal endpoint for sending or receiving data within a node on a computer network. The manual refers to it as the "low level" Socket API, and the only thing it's good at, is at providing a C-like API. Today we will discuss about Sockets programming paradigm, elements of Sockets applications, and the Sockets API. UDP socket example. Socket Send and Receive [C#] This example shows how to send and receive data via TCP/IP using Socket in. Donahoo and Kenneth L. 1 Socket Programming with TCP. But under the hood, your data packet could be broken up into various sized TCP packets. This program is based on a program in the Win32 SDK, though hardly any of the original code remains. The host number is defined by 24 bits of a Class A IP address; while with a Class C network, just 8 bits are available. Hi All, I was tasked to develop a TCP/IP interface between a lab machine sysmex XN-3000 and a LIS developed using ASP. socket communication between client server. Note, we do not cover the UDP API in the course. Lemme know if i should paste complete code. Some common protocols like HTTP, FTP rely on sockets to make connections. In fact, one of built-in features of bash shell is to open TCP/UDP sockets via /dev/tcp (and /dev/udp) device file. Armstrong number is a number which is equal to the sum of digits raise to the power total number of digits in the number. 0 Datagram sockets There are two major types of network sockets, viz. It is a unique combination of well written concise text and rich carefully selected set of working examples. Update added on 03/01/2005 For a more comprehensive example covering topics such as thread synchronization, please see Part II of this article. Then, it initializes a sockaddr_in structure (it contains the address of the server itself, the connection port number and the type of communication), and binds it to the socket. Assign a port number to the socket with bind() 3. NET Socket Server. we contribute a library for actor programming in C++ as open source software to ease native. Create a socket. How to C# Socket programming C# simplifies the network programming through its namespaces like System. */ /* */ /* The message is sent after 5. Write a connection-oriented File Server (FS) program to do the following: a. Get proficient in computer network socket programming using TCP/IP streaming sockets and become a better professional programmer. A socket is a software endpoint that establishes bidirectional communication between a server program and one or more client programs. 2): A TCP MAY implement PUSH flags on SEND calls. TCP vs UDP Both use port numbers application-specific construct serving as a communication endpoint 16-bit unsigned integer, thus ranging from 0 to 65535)to provide end-to-end transport. In resolve_handler(), the iterator it, which points to an endpoint resolved from the name, is used with tcp_socket to establish a connection. I'm only going to talk about INET (i. The Linux Socket Programming book cites several programs which were too lengthy to include entirely in the text. Create a socket. TCP/IP Socket Programming in C#. A socket, s, is created with the socket system call:. Repeatedly: a. sockets Contact Info Mani Radhakrishnan Office 4224 SEL email mradhakr @ cs. will focus on TCP socket connections which are a fundamental part of socket programming since they provide a connection oriented service with both flow and congestion control. Asl it happens, PF_INET has the same value as AF_INET, but socket() really takes PF_INET, so you should use that. Participants will be designing and developing network applications using C and learn how clients and servers communicate with each other using Linux socket programming. Java socket wraps the details of the transfer protocols, providing an easy interface with the. getElementById(id)){js=d. Socket Send and Receive [C#] This example shows how to send and receive data via TCP/IP using Socket in. Simple Socket File Transfer 1. Sockets are. UNIX Network Programming, Volume 1 [an excerpt from the preface] This book is for people who want to write programs that communicate with each other using an application program interface (API) known as sockets. Receive data from client and send it back to client. TCP/IP Sockets in C: Practical Guide for Programmers, Second Edition is a quick and affordable way to gain the knowledge and skills needed to develop sophisticated and powerful web-based applications. Python’s socket interface is similar to C and Java. Create a TCP socket 2. It can create both TCP and UDP client or server. In fact, one of built-in features of bash shell is to open TCP/UDP sockets via /dev/tcp (and /dev/udp) device file. A connectionless socket is used to establish a TCP connection with the HTTP server. A socket is one endpoint of a two-way link between two programs running on a network. Most implementations of TCP/IP provide a programming toolkit that includes a C language library for socket functions. I want to create a client as well as Server. Any connection or pending connection is closed immediately, and Q3Socket goes into the HostLookup state. 0, and SSL 3. The server would accept both UDP or TCP connection from the client (the client can specify which type to use). Build an RPG IV client/server function to remotely print a listing of library objects using TCP/IP socket functions written in C. Get proficient in computer network socket programming using TCP/IP streaming sockets and become a better professional programmer. This book can be ordered at your favorite local bookstore or online. Well, here is another TCP/IP network programming but here we are using GNU C on Linux/Fedora Core platform. You must create your own socket, and cannot use any existing FTP library. transmission, no packetization and addressing required by application. Introduction. Socket programming with TCP Client must contact server • server process must first be running • server must have created socket (door) that welcomes client's contact Client contacts server by: • creating client-local TCP socket • specifying IP address, port number of server process • When client creates socket: client TCP establishes. Close the connection Client 1. CS4514 Project1. The pic is helpful, but we need to know what you are trying to send (i. In this article, we will learn the basics of socket programming in. c programs namely server. FIFO Client/Server Program in Unix Using C Programming. Basically the client connects to the server, the server sends the message "Hello World", and the client prints the received message. doesnt shows up the TCP header. The closest concept to this socket idea is TCP's urgent mode of communications. Even though the content of this article is independently developed, the example program used is influenced by the article on Socket Programming in C# by Ashish Dhar. Because web servers operate on TCP port 80, both of these sockets are TCP sockets, whereas if you were connecting to a server operating on a UDP port, both the server and client sockets would be UDP sockets. Both are similar but the implementation is somewhat different. Net frameworks. Before you start learning socket programming in c, you should basic knowledge of IP address, TCP, UDP. Stream sockets use TCP (Transmission Control Protocol), which is a reliable, stream oriented protocol, and datagram sockets use UDP (Unix Datagram Protocol), which is unreliable and message oriented. int socket_desc , client_sock , c , *new_sock; Your approach of a single thread per client is probably going to be ok while you have a reasonable number of clients, however it may have scale-ability issues if you have a large number of clients. • The Guardian Programmer's Guide describes how to program in the NonStop operating system. python-symmetric-jsonrpc is a JSON-RPC implementation for Python that is symmetric (both ends can call each other), asynchronous (calls can interleave with responses), thread-safe, and transport agnostic (can be run on top of e. Well, here is another TCP/IP network programming but here we are using GNU C on Linux/Fedora Core platform. It is assumed that the reader of this tutorial is already familiar with the RPG IV language, including the use of prototypes, subprocedures, service programs and pointers in an RPG IV environment. You should now be able to add socket communications to your applications! Rob Tougher Rob is a C++ software engineer in the NYC area. When a client requests a connection, the server then accepts the connection. The simplest possible attack is a denial of service just like a telemarketer that calls you at home incessantly. In the example, the client. In this piece of writing, Emorphis Technologies going to discuss in short about the socket programming in C. C# Example Program. Get proficient in computer network socket programming using TCP/IP streaming sockets and become a better professional programmer. I present a collection of classes in C++ that provide an easy and intuitive interface for TCP/IP [DC09] socket programming. A socket is like a file descriptor, it can be for writing or for reading (listening socket). Program Explain. ServerSocket class creates stream socket and connect with specific port ,ip. Communicate c. Hi , I've managed to get connected with the server using a TCP socket, but I didn't get any responses. This is a server side application. TCP/IP Sockets in C: Practical Guide for Programmers, Second Edition is a quick and affordable way to gain the knowledge and skills needed to develop sophisticated and powerful web-based applications. The Chilkat socket component/library provides a high-level, easy-to-use API for TCP/IP socket programming. In this piece of writing, Emorphis Technologies going to discuss in short about the socket programming in C. Net For Coders & Students Udemy Free Download Learn socket programming in C#. i know that we often use TCP/IP related classes to write communication program but i often saw people use socket for also communication program using c#. Socket Code Examples. TCP socket model C program to implement TCP client-server model server process (server. This page gives you access to all the complete and commented code listings. Socket and ServerSocket classes are used for connection-oriented socket programming and DatagramSocket and DatagramPacket classes are used for connection-less socket programming. C Language>Network Programming : TCP/IP packets sniffer source code in C 1) Network Programming : TCP/IP packets sniffer source code in C: A "Packet Sniffer" is an utility that sniffs without modifying the network's packets. In the diagram below, let's look at the sequence of socket API calls and data flow for TCP: TCP Socket Flow (Image source) The left-hand column represents the server. TCP relieves you from having to worry about packet loss, data arriving out-of-order, and many other things that invariably happen when you're communicating across a network. Python network sockets programming tutorial In this tutorial you will learn about in network programming. The Linux Socket Programming book cites several programs which were too lengthy to include entirely in the text. Socket pair. Tell the system to allow connections to be made to that port using listen() 4. But, in the last tutorial covering TCP sockets we defined TCP socket by merely writing S=socket. Line 10-11: Your first use of the sockets application programming interface calling the function “socket. NET for Coders & Students. First, the tcp_send_head is called to get the first sk_buff in the socket buffer and the tcp_cwnd_test and the tcp_snd_wnd_test are performed to check whether the congestion window and the receive window of the receiving TCP allow new packets to be transmitted. Close the connection. C# Client Socket Program When you finish coding and build the Server and Client program , First you have to start C# Server Socket Program from DOS prompt, then you will get a message "Server Started" in your DOS screen, where the server program is running. I have two. Create a TCP socket 2. With RPG IV, you can. pdf), Text File (. Socket Programming is the route of connecting two points on a network to communicate with each other. TCP (Transmission Control Protocol) classes are used to connect and send data between two sockets endpoints (IP address + port). A socket is one endpoint of a two-way link between two programs running on a network. CS4514 Project1. Repeatedly: a. One computer uses Passive mode and listens on a port for a connection from the other computer, which will use Active mode to connect to the first computer via its IP address. Prerequisites - Socket Programming in C/C++, TCP and UDP server using select, UDP Server-Client implementation in C If we are creating a connection between client and server using TCP then it has few functionality like, TCP is suited for applications that require high reliability, and transmission time is relatively less critical. Output of Chat Program for TCP/IP chat program for tcp-ip Program Explain. The network can be a local private network or the public Internet. Net For Coders & Students Udemy Free Download Learn socket programming in C#. Writing a simple TCP Server & Client Application in Python. Download SocketTest - Test My Socket for free. Concretely, it is a representation of this endpoint in networking software (protocol stack), such as an entry in a table (listing communication protocol, destination, status, etc. Windows has something almost identical, called “winsock” File descriptors. An important concept of socket programming & network communication is covered in every video lecture. Output of Chat Program for TCP/IP chat program for tcp-ip Program Explain. TCP Sockets. sockets,networking,tcp,labview,robotics. The C code worked, the Python code did not. Socket Programming using UDP in C. You will learn about the client-server model that is in use for the World Wide Web, E-mail and many other applications. Global Guideline - Interviewer and Interviewee Guide. Aside from this, the byte ordering, and socket addressing structure differences, programming RFCOMM sockets is virtually identical to programming TCP sockets. After the TCP connection is established with client, the simple message application is started. Net For Coders & Students Udemy Free Download Learn socket programming in C#. It doesn't help with receiving. Learn socket programming in C#. They are created using a set of programming request called socket API (Application Programming Interface). A blog on TCP/IP Socket Programming in C#. Net Develop a sound understanding of how networking applications communicate in C#. Greetings readers, in today's tutorial, we'll explain the essential elements of Python socket programming. Sockets are a simple and efficient way to send data between processes. Also client and server must agree on a protocol. After the socket exists, the server goes into "listening" mode and waits for a client's request. The simplest possible attack is a denial of service just like a telemarketer that calls you at home incessantly. File transfer over TCP using sockets in Linux. c : /* client. org or mail your article to [email protected] I am confused, how to read specific. Welcome to LinuxQuestions. Continue on next Module…TCP/IP and RAW socket, more program examples. c socket library - TCP/IP Sockets TCP/IP Sockets in C#: Practical Guide for Programmers (The Practical Guides) "TCP/IP sockets in C# is an excellent book for anyone interested in writing network applications using Microsoft. Sockets provide a mechanism for processes to exchange data. Repeatedly: a. To learn more, read Setting Up Socket Streams in Stream Programming Guide, Using NSStreams For A TCP Connection Without NSHost, or see the SimpleNetworkStreams and RemoteCurrency sample code projects. This program uses make_socket to set up the socket address; see Inet Example. The first version, I tested side-by-side equivalent C code. C Language>Network Programming : TCP/IP packets sniffer source code in C 1) Network Programming : TCP/IP packets sniffer source code in C: A "Packet Sniffer" is an utility that sniffs without modifying the network's packets. Writing a TCP-Based Client. Java program which performs basic arithmetic operations addition, subtraction, multiplication and division. TCP * TCP server : simple TCP server that prints received messages. C & LINUX SOCKET: README FIRST. You must create your own socket, and cannot use any existing FTP library. Endpoint is a C++ class which uses Berkeley sockets to communicate with hosts via the Internet, through IPv4 or IPv6, using TCP or UDP or raw IP, on Win32 or Unix operating systems. Since all operations are asynchronous, handlers are passed to the respective functions. Basically the client connects to the server, the server sends the message "Hello World", and the client prints the received message. The examples in this tutorial will use sockets in the Internet domain using the TCP protocol. Endpoint C++ Socket Library. It supports TCP, UDP, SCTP, HTTP, SSL, IPv6, etc. Tweet !function(d,s,id){var js,fjs=d. The manual refers to it as the "low level" Socket API, and the only thing it's good at, is at providing a C-like API. Die wesentlichen Socket Typen für das TCP/IP sind Stream Sockets und Datagram Sockets. Accept new connection b. What is Socket? We know that in Computer Networks, communication between server and client using TCP/IP protocol is connection oriented (which buffers and bandwidth are reserved for client). Basically the client sends a message to the server, the server converts the message to uppercase and returns it to the client. You are currently viewing LQ as a guest. In this communication, the client sends an XML request to the server which contains the username and password. Sockets are a simple and efficient way to send data between processes. A socket is a software endpoint that establishes bidirectional communication between a server program and one or more client programs. getElementsByTagName(s)[0],p=/^http:/. I read a few resources and the only difference I could see is, To create a TCP socket, you would do. Krzysztof Jakub Szala. Provides an example Server / Client written in MATLAB that utilises the ability to call Java inline to perform message communication using TCP/IP. Prior to RPG IV, the RPG developer could not develop a TCP/IP socket program without using C or some other language that could bind to C functions. io package is required to support i/o operations. Asl it happens, PF_INET has the same value as AF_INET, but socket() really takes PF_INET, so you should use that. Program Explain. Communicate 4. This program uses make_socket to set up the socket address; see Inet Example. Get proficient in computer network socket programming using TCP/IP streaming sockets and become a better professional programmer. Understand TCP socket programing by developing a simplified FTP client that works in the active mode. Accept connections. In this article we use TCP/IP as communication protocol. TCP (Transmission Control Protocol) classes are used to connect and send data between two sockets endpoints (IP address + port). Ports and sockets are one of the most misunderstood concepts in sockets programming. Programming with TCP/IP sockets. Mahmoud, the article presents an overview of the Java model for socket programming. Advanced TCP options that are often set with setsockopt, such as receive windows and the Nagle algorithm, don't make sense in Bluetooth, and can't be used with RFCOMM sockets. Create a TCP socket 2. The argument sockfd is a socket that has been created with socket(2), bound to a local address with bind(2), and is listening for connections after a listen(2). Well, here is another TCP/IP network programming but here we are using GNU C on Linux/Fedora Core platform. Socket Programming Using Tcp Socket Codes and Scripts Downloads Free. Create a TCP socket 2. Sockets: Basic Client-Server Programming in Java - By Rick Proctor By: Rick Proctor Abstract: A Basic Socket Processing How To. You may use Python, Java, or C++/C as the programming language. Message Queue in Unix Using C Programming. The simplest possible attack is a denial of service just like a telemarketer that calls you at home incessantly. ServerSocket class creates stream socket and connect with specific port ,ip. 3 Connecting it together with sockets Files in UNIX and TCP, both being based around streams of bytes, are an almost perfect fit. Socket and ServerSocket classes are used for connection-oriented socket programming and DatagramSocket and DatagramPacket classes are used for connection-less socket programming. The socket type defines the semantics of communication between this socket…. TCP/IP Sockets in C: Practical Guide for Programmers, Second Edition is a quick and affordable way to gain the knowledge and skills needed to develop sophisticated and powerful web-based applications. Job Interview Question, Socket Programming In C Using TCP With Code? Interview Questions And Answers Guide. What are the changes we need to do in the existing code, given by you, to do the same in Unix. If this is all you want to send, the server will get it and this example works just fine. I assume that you'd want to be able to write a complete client-server program. C# Client Socket Program When you finish coding and build the Server and Client program , First you have to start C# Server Socket Program from DOS prompt, then you will get a message "Server Started" in your DOS screen, where the server program is running. Beej's Guide to Network Programming (online and for download) This is a beginner's guide to socket programming with Internet sockets. "The Pocket Guide to TCP/IP Sockets is a quick and affordable way to gain the knowledge and skills you need to develop sophisticated and powerful networked-based programs using sockets. Communicate c. In this mode, the program will not resume execution until the socket operation has completed. TCP (stream) sockets • Also known as SOCK_STREAM • TCP is a connection-oriented byte-stream protocol • During data packet. The library is single threaded, but it is not limited to one thread; the socket classes can run by themselves in their own thread. - Take up at least 3 shellcode samples created using Msfpayload for linux/x86 - Use GDB/Ndisasm/Libemu to dissect the funcSonality of the shellcode - Present your analysis. Socket programming works on both TCP and UDP. Sockets — the Unix standard API for network I/O. The network can be a local private network or the public Internet. Socket Programming in C++ using boost. Well, here is another TCP/IP network programming but here we are using GNU C on Linux/Fedora Core platform. Because web servers operate on TCP port 80, both of these sockets are TCP sockets, whereas if you were connecting to a server operating on a UDP port, both the server and client sockets would be UDP sockets. UDP socket example. Sockets are a simple and efficient way to send data between processes. As always, it's a routing problem. Prerequisites - Socket Programming in C/C++, TCP and UDP server using select, UDP Server-Client implementation in C If we are creating a connection between client and server using TCP then it has few functionality like, TCP is suited for applications that require high reliability, and transmission time is relatively less critical. TCP Client/Server (ESE 548 Local & Wide Area Networks) January 2012 – May 2012 Successfully designed and implemented TCP Client and Server in C supporting multiple requests. Networks: TCP/IP sockets 7 sockfd: a socket descriptor returned by the socket function *servaddr: a pointer to a socket address structure addrlen: the size of the socket address structure The socket address structure must contain the IP address and the port number for the connection wanted. Sockets are language and protocol independent and available to "C", Perl, Python, Ruby and Java (and more) programmers. This book can be ordered at your favorite local bookstore or online. Sol, I will have to try it vis-a-vis C code, again, to be sure. asio: TCP Server and Client - CodeProject. io package is required to support i/o operations. 1 that the core of a network application consists of a pair of programs -- a client program and a server program. TCP/IP Sockets in C: Practical Guide for Programmers, Second Edition is a quick and affordable way to gain the knowledge and skills needed to develop sophisticated and powerful web-based applications. A simple chat program in C (TCP) TCP in C (one server and multiple clients) Socket Programming in C, TCP over a network (2 sys Socket Programming In C (TCP) CryptIt - An Android Application For Encryption An 2013 (27) August (19) July (1) June (4) February (1). Java program which performs basic arithmetic operations addition, subtraction, multiplication and division. TCP SOCKET - Windows System Programming in C/C++ ASystemProgramming Channel. Close the connection Server 1. Sockets are a very powerful way to connect computers, and to exchange any sort of information that you would like between them using a network. Blocking sockets in 16-bit application will allow it to be re-entered at a different point, and 32-bit applications will stop responding to user actions. Accept new connection b. However, the same concepts apply to Windows sockets (although there are. There are a few steps involved in using sockets: Create the socket Identify the socket On the server, wait for an incoming connection On the client, connect to the server's socket Send and receive messages Close the socket Step 1. Download SocketTest - Test My Socket for free. This tutorial strives to teach network programming using sockets to AS/400 or iSeries programmers who use the RPG IV programming language. I'm only going to talk about INET sockets, but they account for at least 99% of the sockets in use. To make a process a TCP server, you need to follow the steps given below − Create a socket with the socket() system call. Your web server should. -- LionKimbro 2005-05-09 22:56:26. Repeatedly: a. Berkeley sockets is an application programming interface (API) for Internet sockets and Unix domain sockets, used for inter-process communication (IPC). When I am trying to initiate a TCP socket request from Linux, there is no response from the FreeBSD system. It originated with the 4. Once a client connects, the server receives data from the client and echoes (sends) the data received back to the client. This is a server side application. It should be: socket(PF_INET, SOCK_STREAM, IPPROTO_TCP) It's always best to zero out the address structures before using them. It is commonly implemented as a library of linkable modules. GitHub Gist: instantly share code, notes, and snippets. Create a TCP socket 2. Also, you will learn how to create a multi-user or a multithreaded server and we are going to test each written application. They are two type of communication protocol uses for socket programming, they are TCP/IP communication and UDP/IP communication. Focusing on C and Python, it guides you through the creation of an echo server and client, which connect over TCP/IP. Since TCP Keepalives are TCP segments without data (and the SEQ number set to one less than the current SEQ number), Keepalive usage bandwidth usage can simply be neglected. Programs should be written in C or C++. Sockets Programming in C Using UDP Datagrams Below you’ll find the code of a simple server-client program in C using UDP sockets for the transmission. Well, here is another TCP/IP network programming but here we are using GNU C on Linux/Fedora Core platform. The C# Socket Programming has two sections. The client in socket programming must know two information: IP Address of Server, and; Port number. 6 Socket Programming with TCP This and the subsequent sections provide an introduction to network application development. sockets,networking,tcp,labview,robotics. Recall from Section 2. This is a very basic program that sends a string of data from the server to the client and displays it to the client. One looking at the Google website, and the other at the Yahoo website. Finally i think this program is most simple and suitable. Once a peer-to-peer connection is established, a socket descriptor is used to uniquely identify the connection. NET Socket Server. TCP sockets • TCP as a byte-stream • During data packet. TCP echo client-server in C. As such, this requires a high level of trust in applications that use this API, since raw sockets can be used to work around the same origin security policy. Socket programing is the key API for programming distributed applications on the Internet. TCP relieves you from having to worry about packet loss, data arriving out-of-order, and many other things that invariably happen when you're communicating across a network. Learn socket programming concepts in our short yet comprehensive course on C programming. It is a way of connecting two nodes on a network to communicate with each other.