Lecture 24. Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 1
|
|
- Ginger York
- 6 years ago
- Views:
Transcription
1 Lecture 24 Log into Linux. Copy directory /home/hwang/cs375/lecture24 Final project posted. Due during finals week. Reminder: No class next Tuesday (11/24) Questions? Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 1
2 Outline Internet (IP) sockets Concurrent servers Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 2
3 IP or Internet sockets can be used to communicate between two processes on two different machines connected by a network. (Or for IPC on a single machine.) An IP socket is an address/port-number pair and uniquely identifies an endpoint. A IP socket pair consists of both the server and client sockets. Every TCP connection is uniquely associated with a socket pair. Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 3
4 Client client1 Server server Client client : :21 server (child1) (*:21, *.*) server (child2) : :21 client : : : :1500 server (child3) : : : :1501 Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 4
5 Just as for local sockets, the server will call socket( ), bind( ), listen( ), and accept( ). First call socket( ) to create the socket: sfd = socket(domain, type, protocol); The domain parameter is now PF_INET. type is usually either SOCK_DGRAM (UDP) or SOCK_STREAM (TCP). (We will use SOCK_STREAM.) The protocol should be 0. Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 5
6 bind( ) is used to assign an address (TCP port) to the socket. Address family is now AF_INET. struct sockaddr_in in_addr; // network struct sockaddr *p_addr = (struct sockaddr *)(&in_addr); in_addr.sin_family = AF_INET; in_addr.sin_port = htons(2400); in_addr.sin_addr.s_addr = htonl(inaddr_any); int len = sizeof(struct sockaddr_in); bind(sfd, p_addr, len); Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 6
7 On the server, we bind our socket to a particular IP address and port number. An IP address of INADDR_ANY will bind to all local IP addresses. We could instead bind to a single IP address on a single interface. Our server will bind to port 2400 in this example. Note the use of the htonl( ) and htons( ) routines. Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 7
8 Instead of binding to a particular port, if we specify a port number of 0 in the address we will be assigned an available port number dynamically. The getsockname( ) routine can then be used to find the port number: getsockname(sfd, p_addr, &addrlen); cout << Port #: << ntohs(in_addr.sin_port) << endl; Note the use of ntohs( ). Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 8
9 The server then uses listen( ) and accept( ) just as for UNIX sockets. result = listen(sfd, qlength); nfd = accept(sfd, p_addr, &len); The p_addr parameter is a pointer to a sockaddr structure (that is really of type sockaddr_in). This will be filled with connecting client info (IP address and port number). Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 9
10 On the client we need only socket( ) and connect( ). We use the server IP and port numbers in the address: cfd = socket(pf_inet, SOCK_STREAM, 0); struct sockaddr_in in_address; struct sockaddr *address = (struct sockaddr *)(&in_address); in_address.sun_family = AF_INET; in_address.sin_port = htons(2400); in_address.sin_addr.s_addr = inet_addr(" "); // csserver int len = sizeof(struct sockaddr_in); res = connect(cfd, address, len); Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 10
11 In this example inet_addr( ) was used to convert an IP number from dotted-quad to network byte order. Typically the IP number would be obtained via getaddrinfo( ). Since our socket file descriptor is not bound to a local endpoint, connect( ) will do this for us. This is usually what we want. You could use bind( ) to bind to a particular local port number before the call to connect( ). Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 11
12 read( ) and write( ) can be used to send data via the socket. There also are recv( ) and send( ) routines that can used and often are recommended because they provide more options via their flags parameter. Consult the man pages, if you want to use these. Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 12
13 Examples network_server.cpp is an example server. It is similar to the local_server.cpp from last lecture but is modified to use a TCP/IP socket instead of a local (UNIX) socket. It illustrates dynamic port assignment and the use of getsockname( ). network_client.cpp is a similarly modified version of local_client.cpp. It requires two command-line arguments, an IP address (in dotted-quad notation) and a port number. Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 13
14 Concurrent Server Skeleton code for a concurrent server... listenfd = socket(... ); bind( listenfd,... ); listen(listenfd,... ); while ( true ) { connfd = accept( listenfd,... ); if( (pid = fork()) == 0) { close( listenfd ); } doit(connfd); // or exec(...) close( connfd ); // if not exec'd exit(0); } close( connfd ); // parent Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 14
15 Concurrent Server It is important that the parent call close( ) for each connected socket returned by accept( ). This ensures that the parent does not run out of file descriptors, but more importantly it ensures that when the child closes the connected socket the client connection will be terminated. (This does not happen until the open reference count on the socket reaches zero.) Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 15
16 Avoiding Zombies As noted previously, the parent of an exiting process must issue a wait on the process for it to terminate completely. We do not want the main server process to have to issue these waits for the processes handling client requests. Typically, in order to avoid creating zombie processes, the doublefork technique covered earlier is used. Thursday, November 19 CS 375 UNIX System Programming - Lecture 24 16
UNIX System Programming Lecture 19: IP Sockets
UNIX System Programming Lecture 19: Outline Reference BLP: Chapter 15 man pages: socket, bind, connect, listen, accept, ip(7), ipv6(7), getaddrinfo, getnameinfo 1 Review of UNIX Sockets On the server,
More informationCS321: Computer Networks Socket Programming
CS321: Computer Networks Socket Programming Dr. Manas Khatua Assistant Professor Dept. of CSE IIT Jodhpur E-mail: manaskhatua@iitj.ac.in Socket Programming It shows how the network application programs
More informationA Socket Example. Haris Andrianakis & Angelos Stavrou George Mason University
A Socket Example & George Mason University Everything is a file descriptor Most socket system calls operate on file descriptors Server - Quick view socket() bind() listen() accept() send(), recv() close()
More informationClient Server Computing
Client Server Computing Although the Internet provides a basic communication service, the protocol software cannot initiate contact with, or accept contact from, a remote computer. Instead, two application
More informationUnix Network Programming Chapter 4. Elementary TCP Sockets 광운대학교컴퓨터과학과 정보통신연구실 석사과정안중현
Unix Network Programming Chapter 4. Elementary TCP Sockets 광운대학교컴퓨터과학과 정보통신연구실 석사과정안중현 4.1 Introduction A Time line of the typical scenario that takes place between a TCP client and server. Describes the
More informationSocket Programming. CSIS0234A Computer and Communication Networks. Socket Programming in C
1 CSIS0234A Computer and Communication Networks Socket Programming in C References Beej's Guide to Network Programming Official homepage: http://beej.us/guide/bgnet/ Local mirror http://www.cs.hku.hk/~c0234a/bgnet/
More informationLecture 2. Outline. Layering and Protocols. Network Architecture. Layering and Protocols. Layering and Protocols. Chapter 1 - Foundation
Lecture 2 Outline Wireshark Project 1 posted, due in a week Lab from a different textbook Work through the lab and answer questions at the end Chapter 1 - Foundation 1.1 Applications 1.2 Requirements 1.3
More informationThe BSD UNIX Socket Interface (CS 640 Lecture) Assignment 1. Interprocess Communication (IPC) Work Individually (no groups)
The BSD UNIX Socket Interface (CS 640 Lecture) Assignment 1 Work Individually (no groups) Due Date: in class, Monday, September 19 Robert T Olsen olsen@cswiscedu 7390CS Office Hours: 3-5T, 11-12F - exception
More informationCS321: Computer Networks Introduction to Application Layer
CS321: Computer Networks Introduction to Application Layer Dr. Manas Khatua Assistant Professor Dept. of CSE IIT Jodhpur E-mail: manaskhatua@iitj.ac.in Basic Application layer provides services to the
More informationSocket Programming 2007/03/28
Socket Programming 2007/03/28 Reference W. Richard Stevens, Unix Network Programming 2/e Volume 1,1998 James F. Kurose and Keith W. Ross, "Computer Networks: A Top-Down Approach Featuring the Internet
More informationHyo-bong Son Computer Systems Laboratory Sungkyunkwan University
Sockets Hyo-bong Son (proshb@csl.skku.edu) Computer Systems Laboratory Sungkyunkwan University http://csl.skku.edu Client-Server Model Most network application is based on the client-server model: A server
More informationChristian Tschudin (basierend auf einem Foliensatz von C. Jelger und T. Meyer) Departement Mathematik und Informatik, Universität Basel
Internettechnologien (CS262) Socket Programming in C 4. März 2015 Christian Tschudin (basierend auf einem Foliensatz von C. Jelger und T. Meyer) Departement Mathematik und Informatik, Universität Basel
More informationOral. Total. Dated Sign (2) (5) (3) (2)
R N Oral Total Dated Sign (2) (5) (3) (2) Assignment Group- A_07 Problem Definition Write a program using TCP socket for wired network for following Say Hello to Each other ( For all students) File transfer
More informationLecture 3 Overview! Last Lecture! TCP/UDP and Sockets introduction!
Lecture 3 Overview! Last Lecture! TCP/UDP and Sockets introduction! This Lecture! Elementary TCP sockets! TCP Client-Server example! Source: Stevens book(chapters 4,5), Comer s book (Chapters 20, 21)!
More informationHybrid of client-server and P2P. Pure P2P Architecture. App-layer Protocols. Communicating Processes. Transport Service Requirements
Announcements CS 5565 Network Architecture and Protocols Lecture 5 Godmar Back Problem Set 1 due Feb 17 Project 1 handed out shortly 2 Layer The Layer Let s look at some s (in keeping with top-down) architectures:
More informationTutorial on Socket Programming
Tutorial on Socket Programming Computer Networks - CSC 458 Department of Computer Science Hao Wang (Slides are mainly from Seyed Hossein Mortazavi, Monia Ghobadi, and Amin Tootoonchian, ) 1 Outline Client-server
More informationSocket Programming for TCP and UDP
CSCI4430 Data Communication and Computer Networks Socket Programming for TCP and UDP ZHANG, Mi Jan. 19, 2017 Outline Socket Programming for TCP Introduction What is TCP What is socket TCP socket programming
More informationTypes (Protocols) Associated functions Styles We will look at using sockets in C Java sockets are conceptually quite similar
Socket Programming What is a socket? Using sockets Types (Protocols) Associated functions Styles We will look at using sockets in C Java sockets are conceptually quite similar - Advanced Data Communications:
More informationCSE 124 Discussion Section Sockets Programming 10/10/17
CSE 124 Discussion Section Sockets Programming 10/10/17 Topics What s a socket? Creating a socket Connecting a socket Sending data Receiving data Resolving URLs to IPs Advanced socket options Live code
More informationNETWORK PROGRAMMING. Instructor: Junaid Tariq, Lecturer, Department of Computer Science
NETWORK PROGRAMMING CSC- 341 25 Instructor: Junaid Tariq, Lecturer, Department of Computer Science 26 9 Lecture Sockets as means for inter-process communication (IPC) application layer Client Process Socket
More informationOverview. Setup and Preparation. Exercise 0: Four-way handshake
Overview In this Lab assignment you will develop a simple client program written in Python(use a socket library) to interact with a CSE 3300 Server running on a remote machine. The server, running on the
More informationProgramming with TCP/IP. Ram Dantu
1 Programming with TCP/IP Ram Dantu 2 Client Server Computing Although the Internet provides a basic communication service, the protocol software cannot initiate contact with, or accept contact from, a
More informationUnix Network Programming
Introduction to Computer Networks Polly Huang EE NTU Unix Network Programming The socket struct and data handling System calls Based on Beej's Guide to Network Programming 1 The Unix Socket A file descriptor
More informationElementary TCP Sockets
Elementary TCP Sockets Chapter 4 UNIX Network Programming Vol. 1, Second Ed. Stevens Distributed Computer Systems 1 socket interface Application 1 Application 2 socket interface user kernel user kernel
More informationNetwork Software Implementations
Network Software Implementations Number of computers on the Internet doubling yearly since 1981, nearing 200 million Estimated that more than 600 million people use the Internet Number of bits transmitted
More informationA Client-Server Exchange
Socket programming A Client-Server Exchange A server process and one or more client processes Server manages some resource. Server provides service by manipulating resource for clients. 1. Client sends
More informationSocket Programming TCP UDP
Socket Programming TCP UDP Introduction Computer Network hosts, routers, communication channels Hosts run applications Routers forward information Packets: sequence of bytes contain control information
More informationSocket Programming. Sungkyunkwan University. Hyunseung Choo Copyright Networking Laboratory
Socket Programming Sungkyunkwan University Hyunseung Choo choo@skku.edu Copyright 2000-2019 Networking Laboratory Contents Goals Client-Server mechanism Introduction to socket Programming with socket on
More informationCS118 Discussion 1B, Week 1. Taqi Raza BUNCHE 1209B, Fridays 12:00pm to 1:50pm
CS118 Discussion 1B, Week 1 Taqi Raza BUNCHE 1209B, Fridays 12:00pm to 1:50pm 1 TA Taqi, PhD student in Computer Networking Discussion (1B): Bunche 1209, Fri 12:00 1:50 p.m. Office hours: Boelter Hall
More informationSockets. Jin-Soo Kim Computer Systems Laboratory Sungkyunkwan University
Sockets Jin-Soo Kim (jinsookim@skku.edu) Computer Systems Laboratory Sungkyunkwan University http://csl.skku.edu Internet Connections (1) Connection Clients and servers communicate by sending streams of
More informationCSC209H Lecture 9. Dan Zingaro. March 11, 2015
CSC209H Lecture 9 Dan Zingaro March 11, 2015 Socket Programming (Kerrisk Ch 56, 57, 59) Pipes and signals are only useful for processes communicating on the same machine Sockets are a general interprocess
More informationNetwork Programming in C. Networked Systems 3 Laboratory Sessions and Problem Sets
Network Programming in C Networked Systems 3 Laboratory Sessions and Problem Sets Lab Timetable, Aims, and Objectives Teaching Week Activity 14 Introduction 15 Warm-up exercise 16 17 Web client 18 19 20
More informationsocketservertcl a Tcl extension for using SCM_RIGHTS By Shannon Noe - FlightAware
socketservertcl a Tcl extension for using SCM_RIGHTS By Shannon Noe - FlightAware Presented at the 24th annual Tcl/Tk conference, Houston Texas, October 2017 Abstract: Horizontal scaling is used to distribute
More informationCS 640: Computer Networking
CS 640: Computer Networking Yu-Chi Lai Lecture 3 Network Programming Topics Client-server model Sockets interface Socket primitives Example code for echoclient and echoserver Debugging With GDB Programming
More informationTCP/IP Sockets in C: Practical Guide for Programmers. Computer Chat. Internet Protocol (IP) IP Address. Transport Protocols. Ports
TCP/IP Sockets in C: Practical Guide for Programmers Computer Chat! How do we make computers talk? Michael J. Donahoo Kenneth L. Calvert Morgan Kaufmann Publisher $14.95 Paperback! How are they interconnected?
More informationPA #2 Reviews. set_name, get_name, del_name. Questions? Will be modified after PA #4 ~
Sockets Prof. Jin-Soo Kim( jinsookim@skku.edu) TA Dong-Yun Lee(dylee@csl.skku.edu) Computer Systems Laboratory Sungkyunkwan University http://csl.skku.edu PA #2 Reviews set_name, get_name, del_name Will
More informationUNIX Sockets. COS 461 Precept 1
UNIX Sockets COS 461 Precept 1 Socket and Process Communica;on application layer User Process Socket transport layer (TCP/UDP) OS network stack network layer (IP) link layer (e.g. ethernet) Internet Internet
More informationThe Berkeley Sockets API. Networked Systems Architecture 3 Lecture 4
The Berkeley Sockets API Networked Systems Architecture 3 Lecture 4 The Berkeley Sockets API Widely used low-level C networking API First introduced in 4.3BSD Unix Now available on most platforms: Linux,
More informationCS 43: Computer Networks. 05: Socket Programming September 12-14, 2018
CS 43: Computer Networks 05: Socket Programming September 12-14, 2018 Reading Quiz Lecture 5/6 - Slide 2 Socket Programming Adapted from: Donahoo, Michael J., and Kenneth L. Calvert. TCP/IP sockets in
More informationUNIX Network Programming. Overview of Socket API Network Programming Basics
UNIX Network Programming Overview of Socket API Network Programming Basics 1 Client-Server Model Client Machine A Network Server Machine B Web browser and server FTP client and server Telnet client and
More informationSimple network applications using sockets (BSD and WinSock) Revision 1 Copyright Clifford Slocombe
Simple network applications using sockets (BSD and WinSock) Revision 1 Copyright 2002 - Clifford Slocombe sockets@slocombe.clara.net COPYRIGHT 2002 - CLIFFORD SLOCOMBE PAGE 1 OF 8 Table of Contents Introduction...3
More informationLecture 7. Followup. Review. Communication Interface. Socket Communication. Client-Server Model. Socket Programming January 28, 2005
Followup symbolic link (soft link): pathname, can be across file systems, replacement of file will be active on all symbolic links, consumes at least an inode. hard link: pointers to an inode, only in
More informationUNIX Sockets. Developed for the Azera Group By: Joseph D. Fournier B.Sc.E.E., M.Sc.E.E.
UNIX Sockets Developed for the Azera Group By: Joseph D. Fournier B.Sc.E.E., M.Sc.E.E. Socket and Process Communication application layer User Process Socket transport layer (TCP/UDP) network layer (IP)
More informationContext. Distributed Systems: Sockets Programming. Alberto Bosio, Associate Professor UM Microelectronic Departement
Distributed Systems: Sockets Programming Alberto Bosio, Associate Professor UM Microelectronic Departement bosio@lirmm.fr Context Computer Network hosts, routers, communication channels Hosts run applications
More informationReview. Preview. Closing a TCP Connection. Closing a TCP Connection. Port Numbers 11/27/2017. Packet Exchange for TCP Connection
Review Preview Algorithms and Issues in Client Software Design Client Architecture Identifying the Location of a Parsing an Address Argument Looking Up a Domain Name Looking Up a Well-Known Port by Name
More informationSOCKET PROGRAMMING. What is a socket? Using sockets Types (Protocols) Associated functions Styles
LABORATORY SOCKET PROGRAMMING What is a socket? Using sockets Types (Protocols) Associated functions Styles 2 WHAT IS A SOCKET? An interface between application and network The application creates a socket
More informationNetwork Socket Programming - 3 BUPT/QMUL
Network Socket Programming - 3 BUPT/QMUL 2018-04-02 Agenda Basic concepts in NP Introduction to IP & TCP/UDP Introduction to Sockets 2 Introduction to Sockets Reviews of some helpful points Sockets interface
More informationIntroduction to Socket Programming
UNIT II - ELEMENTARY TCP SOCKETS Introduction to Socket Programming Introduction to Sockets Socket address Structures Byte ordering functions address conversion functions Elementary TCP Sockets socket,
More informationPorts under 1024 are often considered special, and usually require special OS privileges to use.
1 2 Turns out that besides an IP address (used by the IP layer), there is another address that is used by TCP (stream sockets) and, coincidentally, by UDP (datagram sockets). It is the port number. It's
More informationCS307 Operating Systems Processes
CS307 Processes Fan Wu Department of Computer Science and Engineering Shanghai Jiao Tong University Spring 2018 Process Concept Process a program in execution An operating system executes a variety of
More informationProcesses. Process Concept. The Process. The Process (Cont.) Process Control Block (PCB) Process State
CS307 Process Concept Process a program in execution Processes An operating system executes a variety of programs: Batch system jobs Time-shared systems user programs or tasks All these activities are
More informationWinSock. What Is Sockets What Is Windows Sockets What Are Its Benefits Architecture of Windows Sockets Network Application Mechanics
WinSock What Is Sockets What Is Windows Sockets What Are Its Benefits Architecture of Windows Sockets Network Application Mechanics What Is Sockets Standard API (Application Programming Interface) for
More informationNetwork Programming Worksheet 2. Simple TCP Clients and Servers on *nix with C.
Simple TCP Clients and Servers on *nix with C. Aims. This worksheet introduces a simple client and a simple server to experiment with a daytime service. It shows how telnet can be used to test the server.
More informationDepartment of Computer Science
Department of Computer Science Notes on Interprocess Communication in Unix Jean Dollimore,Oct.1990, last revised Feb. 1996 These notes explain how you can write "distributed programs" in C or C++ running
More informationNetwork Programming in C: The Berkeley Sockets API. Networked Systems 3 Laboratory Sessions
Network Programming in C: The Berkeley Sockets API Networked Systems 3 Laboratory Sessions The Berkeley Sockets API Widely used low-level C networking API First introduced in 4.3BSD Unix Now available
More informationNetwork Socket Programming - 3 BUPT/QMUL
Network Socket Programming - 3 BUPT/QMUL 2017-3-27 Agenda Basic concepts in NP Introduction to IP & TCP/UDP Introduction to Sockets 2 Introduction to Sockets Reviews of some helpful points Sockets interface
More informationAnnouncement (1) Due date for PA3 is changed (~ next week) PA4 will also be started in the next class. Not submitted. Not scored
Announcement (1) Due date for PA3 is changed (~ next week) PA4 will also be started in the next class Not submitted Not scored 1 Concurrent Programming Prof. Jin-Soo Kim( jinsookim@skku.edu) TA Sanghoon
More informationSockets. Dong-kun Shin Embedded Software Laboratory Sungkyunkwan University Embedded Software Lab.
1 Sockets Dong-kun Shin Embedded Software Laboratory Sungkyunkwan University http://nyx.skku.ac.kr Echo Client (1) 2 #include #include #include #include
More informationCSC209: Software tools. Unix files and directories permissions utilities/commands Shell programming quoting wild cards files
CSC209 Review CSC209: Software tools Unix files and directories permissions utilities/commands Shell programming quoting wild cards files ... and systems programming C basic syntax functions arrays structs
More informationCSC209: Software tools. Unix files and directories permissions utilities/commands Shell programming quoting wild cards files. Compiler vs.
CSC209 Review CSC209: Software tools Unix files and directories permissions utilities/commands Shell programming quoting wild cards files... and systems programming C basic syntax functions arrays structs
More informationECE 650 Systems Programming & Engineering. Spring 2018
ECE 650 Systems Programming & Engineering Spring 2018 Programming with Network Sockets Tyler Bletsch Duke University Slides are adapted from Brian Rogers (Duke) Sockets We ve looked at shared memory vs.
More informationCLIENT-SIDE PROGRAMMING
CLIENT-SIDE PROGRAMMING George Porter Apr 11, 2018 ATTRIBUTION These slides are released under an Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0) Creative Commons license These slides
More informationSession NM056. Programming TCP/IP with Sockets. Geoff Bryant Process software
Session NM056 Programming TCP/IP with Sockets Geoff Bryant Process software Course Roadmap Slide 57 NM055 (11:00-12:00) Important Terms and Concepts TCP/IP and Client/Server Model Sockets and TLI Client/Server
More informationNetwork Programming November 3, 2008
15-213 Network Programming November 3, 2008 Topics Programmer s view of the Internet (review) Sockets interface Writing clients and servers class20.ppt A Client-Server Transaction Most network applications
More informationSystem Programming. Sockets
Content : by Dr. B. Boufama School of Computer Science University of Windsor Instructor: Dr. A. Habed adlane@cs.uwindsor.ca http://cs.uwindsor.ca/ adlane/60-256 Content Content 1 Introducing 2 3 Internet
More informationCS 3516: Computer Networks
Welcome to CS 3516: Prof. Yanhua Li Time: 9:00am 9:50am M, T, R, and F Location: AK219 Fall 2018 A-term 1 Some slides are originally from the course materials of the textbook Computer Networking: A Top
More informationTCP: Three-way handshake
Sockets in C 1 Sockets in C The slides by themselves will not be sufficient to learn how to write socket code. If you did not attend class, then you will want to review the relevant chapters in Kerrisk
More informationSystem Programming. Sockets: examples
Content : by Dr. B. Boufama School of Computer Science University of Windsor Instructor: Dr. A. Habed adlane@cs.uwindsor.ca http://cs.uwindsor.ca/ adlane/60-256 Content Content 1 Socket based client/server
More informationECE 435 Network Engineering Lecture 2
ECE 435 Network Engineering Lecture 2 Vince Weaver http://web.eece.maine.edu/~vweaver vincent.weaver@maine.edu 6 September 2018 Announcements Homework 1 will be posted. Will be on website, will announce
More informationComputer Network Lab, SS Fachgebiet Technische Informatik, Joachim Zumbrägel. Overview. Sockets. Sockets in C.
Computer Network Lab 2016 Fachgebiet Technische Informatik, Joachim Zumbrägel Overview Sockets Sockets in C Sockets in Delphi 1 Inter process communication There are two possibilities when two processes
More informationWhat s an API? Do we need standardization?
Network Interface z The network protocol stack is a part of the OS z Need an API to interface applications to the protocol stack. What s an API? Do we need standardization? z The socket interface is the
More informationNetwork Programming Appendix Network Programming Labs
Network Programming Appendix Network Programming Labs Tornado Training Workshop Copyright E-41L Note to Windows Teams The networking programming labs ask you to compile and run some programs on the UNIX
More informationΕργαστήριο 9 I/O Multiplexing
Εργαστήριο 9 I/O Multiplexing Στοεργαστήριοθαμελετηθούν: Server High Level View I/O Multiplexing Solutions for Concurrency nonblocking I/O Use alarm and signal handler to interrupt slow system calls. Use
More informationCS4514 (C04) HELP Session 1 Introduction to Network Programming (v1.3)
CS4514 (C04) HELP Session 1 Introduction to Network Programming (v1.3) Speaker: Frank Posluszny Outline! Project 1 Overview! Unix Network Programming Client Server Communication with netoracle! Project
More informationNetwork programming(i) Lenuta Alboaie
Network programming(i) Lenuta Alboaie adria@info.uaic.ro 2017 2018 Computer Network http://www.info.uaic.ro/~computernetworks 1 Content Client/server paradigm API for network programming BSD Socket Characteristics
More informationHow do we Communicate? Introduction to Unix Network Programming. What does Alice do? What does Bob do? Two simplest networking programs
Introduction to Unix Network Programming Reference: Stevens Unix Network Programming How do we Communicate? Send a mail from Alice to Bob Bob Alice in Champaign, Bob in Hollywood Example: US Postal Service
More informationSockets. Dong-kun Shin Embedded Software Laboratory Sungkyunkwan University Embedded Software Lab.
1 Sockets Dong-kun Shin Embedded Software Laboratory Sungkyunkwan University http://nyx.skku.ac.kr Internet Connections (1) 2 Connection Clients and servers communicate by sending streams of bytes over
More informationLab 0. Yvan Petillot. Networks - Lab 0 1
Lab 0 Yvan Petillot Networks - Lab 0 1 What You Will Do In This Lab. The purpose of this lab is to help you become familiar with the UNIX/LINUX on the lab network. This means being able to do editing,
More informationCSC209 Review. Yeah! We made it!
CSC209 Review Yeah! We made it! 1 CSC209: Software tools Unix files and directories permissions utilities/commands Shell programming quoting wild cards files 2 ... and C programming... C basic syntax functions
More informationIntroduction to Client-Server Model
Preview Introduction to Client-Server Model Motivation of Client-Server Model Terminologies and Concepts in Client-Server Model Connectionless vs. Connection-Oriented Stateless vs. Stateful Server Identify
More informationKen French HELP Session 1 CS4514
Ken French HELP Session 1 CS4514 CS4514 We expect that you have had a programming course similar to 2005 before coming into this class. Programs will be done in C or C++ We also expect that you will have
More informationSockets 15H2. Inshik Song
Sockets 15H2 Inshik Song Internet CAU www server (www.cau.ac.kr) Your web browser (Internet Explorer/Safari) Sockets 2 How do we find the server? Every computer on the Internet has an Internet address.
More informationApplication Architecture
CS 4/55231 Internet Engineering Kent State University Dept. of Science LECT-2 Application Architecture 1 2 Class Mechanics Topics to Cover Send email and get listed in class email list. Use "IN2004S" in
More informationIntroduction to Berkeley Sockets
INF1060: Introduction to Operating Systems and Data Communication Data Communication: Introduction to Berkeley Sockets Michael Welzl (adapted from lectures by Pål Halvorsen, Carsten Griwodz & Olav Lysne)
More informationSOCKETS. COMP750 Distributed Systems
SOCKETS COMP750 Distributed Systems Sockets The Socket library is a traditional Application Program Interface (API) to the transport layer. Sockets were originally implemented in Unix systems and have
More informationIntroduction to Berkeley Sockets
INF1060: Introduction to Operating Systems and Data Communication Data Communication: Introduction to Berkeley Sockets Michael Welzl (revised by Hans Petter Taugbøl Kragset 2015) (adapted from lectures
More informationInter-Process Communication. Disclaimer: some slides are adopted from the book authors slides with permission 1
Inter-Process Communication Disclaimer: some slides are adopted from the book authors slides with permission 1 Today Inter-Process Communication (IPC) What is it? What IPC mechanisms are available? 2 Inter-Process
More informationAnnouncements. CS 5565 Network Architecture and Protocols. Queuing. Demultiplexing. Demultiplexing Issues (1) Demultiplexing Issues (2)
Announcements CS 5565 Network Architecture and Protocols Problem Set 1 due Feb 18 Project 1A due Feb 19 Lecture 5 Godmar Back 2 Queuing Demultiplexing send queues Layer k+1 Layer k recv queues End systems
More informationSocket Programming. Dr. -Ing. Abdalkarim Awad. Informatik 7 Rechnernetze und Kommunikationssysteme
Socket Programming Dr. -Ing. Abdalkarim Awad Informatik 7 Rechnernetze und Kommunikationssysteme Before we start Can you find the ip address of an interface? Can you find the mac address of an interface?
More informationSocket Programming. #In the name of Allah. Computer Engineering Department Sharif University of Technology CE443- Computer Networks
#In the name of Allah Computer Engineering Department Sharif University of Technology CE443- Computer Networks Socket Programming Acknowledgments: Lecture slides are from Computer networks course thought
More informationECE 435 Network Engineering Lecture 2
ECE 435 Network Engineering Lecture 2 Vince Weaver http://web.eece.maine.edu/~vweaver vincent.weaver@maine.edu 31 August 2017 Announcements Homework 1 will be posted. Will be on website, will announce
More informationLinux Network Programming, Part 1
Linux Network Programming, Part 1 http://www.linuxjournal.com/article/2333?page=0,0 Feb 01, 1998 By Ivan Griffin and John Nelson This is the first of a series of articles about how to develop networked
More informationProject 3. Reliable Data Transfer over UDP. NTU CSIE Computer Networks 2011 Spring
Project 3 Reliable Data Transfer over UDP NTU CSIE Computer Networks 2011 Spring Project Goal In Project 3, students are asked to understand and implement reliable data transfer mechanism over UDP. UDP
More informationSockets and Parallel Computing. CS439: Principles of Computer Systems April 11, 2018
Sockets and Parallel Computing CS439: Principles of Computer Systems April 11, 2018 Last Time Introduction to Networks OSI Model (7 layers) Layer 1: hardware Layer 2: Ethernet (frames) SAN, LAN, WAN Layer
More informationNetworked Applications: Sockets. Goals of Todayʼs Lecture. End System: Computer on the ʻNet. Client-server paradigm End systems Clients and servers
Networked Applications: Sockets CS 375: Computer Networks Spring 2009 Thomas Bressoud 1 Goals of Todayʼs Lecture Client-server paradigm End systems Clients and servers Sockets and Network Programming Socket
More informationCONCURRENCY MODEL. UNIX Programming 2014 Fall by Euiseong Seo
CONCURRENCY MODEL UNIX Programming 2014 Fall by Euiseong Seo Echo Server Revisited int main (int argc, char *argv[]) {... listenfd = socket(af_inet, SOCK_STREAM, 0); bzero((char *)&saddr, sizeof(saddr));
More informationOutline. Distributed Computer Systems. Socket Basics An end-point for a IP network connection. Ports. Sockets and the OS. Transport Layer.
Outline Distributed Computer Systems Socket basics Socket details (TCP and UDP) Socket options Final notes Sockets Socket Basics An end-point for a IP network connection what the application layer plugs
More informationClient-server model The course that gives CMU its Zip! Network programming Nov 27, Using ports to identify services.
15-213 The course that gives CMU its Zip! Network programming Nov 27, 2001 Topics Client- model Sockets interface Echo and Client- model Every network application is based on the - model: Application is
More informationTCP Network Programming in C
CPSC 360 Network Programming TCP Network Programming in C Michele Weigle Department of Computer Science Clemson University mweigle@cs.clemson.edu http://www.cs.clemson.edu/~mweigle/courses/cpsc360 1 Sockets
More informationOutline. Operating Systems. Socket Basics An end-point for a IP network connection. Ports. Network Communication. Sockets and the OS
Outline Operating Systems Socket basics Socket details Socket options Final notes Project 3 Sockets Socket Basics An end-point for a IP network connection what the application layer plugs into programmer
More information