Sockets in networking pdfs

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Programming With Sockets 13 2 of the network protocols because they can only be used to communicate with processes within the same UNIX system. They are rarely used today and are only briefly covered in this manual. Socket Libraries The socket interface routines are in a library that must be linked with the application. The librarieslibsocket Types of Sockets: Internet Sockets, unix sockets, X.25 sockets etc Internet sockets characterized by IP Address (4 bytes) and port number (2 bytes) Socket Description Types of Internet Sockets Stream Sockets (SOCK_STREAM) C o n ec tir d Rely on TCP to provide reliable two-way connected communication Datagram Sockets (SOCK_DGRAM) Rely on UDP • Create a socket. • Determine server address and port number. • Initiate the connection to the server (TCP). • Exchange data with the server. • Write data to the socket. • Read data from the socket. • Note, single socket supports both reading and writing. • Manipulate the data (e.g., display email, play music) • Close the socket. Operations on a Socket • Socket works very similar to a file • open() -- open a socket • read() -- read from a socket (analogous to receive data) • write() -- write to a socket (analogous to send data) • close() -- close the socket 3 Socket Programming Nikhil Shetty GSI, EECS122 Spring 2006. 2 Outline • APIs - Motivation • Sockets • Java Socket classes • Tips for programming What is an API? • API - stands for Application Programming Interface. 3 What is an API? • API - stands for Application Programming Interface. • Interface to what? - In our case, it is an interface to use the network. What is an Spring 22 TAs: Lakiotakis Manos, Plevridi Eleftheria (Computer Science Department, University of Crete)Advanced Topicson Network Socket Programming:Part 2 March 31, 2022 1 / 13 Advanced Topics on Network Socket Programming: Part 2 Computer Science Department, University of Crete Spring 22 TAs: Lakiotakis Manos, Plevridi Eleftheria March 31, 2022 A program can get a socket via a function provided by the operating system. This function then returns a socket descriptor, usually a simple integer, similar to the ones provided by most operating systems for Read- and Write- Operationsonfiles. Thissocketdescriptorthencanbeusedtowriteorreaddatafromthesocket. Network programming: sockets Antonio Lioy < lioy@polito it >Antonio Lioy < lioy@polito.it > english version created and modified by Marco D. Aime < m.aime@polito.it > Politecnico di Torino Dip. Automatica e Informatica Warning for programmers network programming is dangerously close to O.S. kernel, and therefore: It can easily hang the O.S. verify the results of every operation, without network Port -Unique Id number on your computer linked to your program Packet -Data sent from one computer to another Client 1 Server CS 640 Introduction to Computer Networks . Introduction How does one computer send information to another computer? Request Response IP Address -Unique Id on the network Port -Unique Id number on your computer linked to your program Packet -Data sent 2007 CSCE515 - Computer Network Programming SO_REUSEADDR Used by servers that are transient - allows bi