Computer Systems: A Programmer's Perspective (3rd Edition)
3rd Edition
ISBN: 9780134092669
Author: Bryant, Randal E. Bryant, David R. O'Hallaron, David R., Randal E.; O'Hallaron, Bryant/O'hallaron
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 12, Problem 12.27HW
Some network
FILE *fpin, *fpout;
fpin = fdopen(sockfd, "r");
fpout = fdopen(sockfd, "w”);
When the server finishes interacting with the client, close both streams as follows:
fclose(fpin);
fclose(fpout);
However, if you try this approach in a concurrent server based on threads, you will create a deadly race condition. Explain.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Using client-server socket programming, implement a multi-threaded server that returns to the client the synonym of a word as stored in a dictionary. The client should prompt the user for a word, reads the word from the screen and sends it to the server and waits for response from the server. Once the client gets the synonym of the word, it should print the word and its synonym on the screen and prompt for another word. This should continue until the user enters the characters @ to quit. Example: >>> python TCPClient.py Input a word: weak weak ==> frail Input a word: fair fair ==> just Input a word: @ Notes: 1) A file that contains some words and their synonyms is provided 2) In the server code, read the file to a global python dictionary object engDict = {} # empty dictionary object with open('dictionary.txt') as f: # open the file for line in f: tok = line.split() engDict[tok[0]] = tok[1] print(engDict) 3) Here is a Skelton of the server [some code here ] class…
A connected instance of Socket contains an InputStream and OutputStream that can be used just
like any other Java I/O or C# stream
Select one:
O True
O False
IN C language
Write a socket server/client program such that
The client sends to the server 2 integer numbers L and S and the server finds the difference
between them and send the result of the subtraction (L-S) back to the client to display it in the terminal window.
Chapter 12 Solutions
Computer Systems: A Programmer's Perspective (3rd Edition)
Ch. 12.1 - Prob. 12.1PPCh. 12.1 - Prob. 12.2PPCh. 12.2 - Practice Problem 12.3 (solution page 1036) In...Ch. 12.2 - Practice Problem 12.4 (solution page 1036) In the...Ch. 12.4 - Prob. 12.5PPCh. 12.4 - Prob. 12.6PPCh. 12.5 - Prob. 12.7PPCh. 12.5 - Prob. 12.8PPCh. 12.5 - Prob. 12.9PPCh. 12.5 - Prob. 12.10PP
Ch. 12.6 - Prob. 12.11PPCh. 12.7 - Prob. 12.12PPCh. 12.7 - Prob. 12.13PPCh. 12.7 - Prob. 12.14PPCh. 12.7 - Prob. 12.15PPCh. 12 - Prob. 12.20HWCh. 12 - Derive a solution to the second readers-writers...Ch. 12 - Prob. 12.22HWCh. 12 - Prob. 12.23HWCh. 12 - Prob. 12.24HWCh. 12 - Prob. 12.25HWCh. 12 - Prob. 12.26HWCh. 12 - Some network programming texts suggest the...Ch. 12 - Prob. 12.28HWCh. 12 - Prob. 12.29HWCh. 12 - Prob. 12.30HWCh. 12 - Implement a version of the standard I/O fgets...Ch. 12 - Prob. 12.32HWCh. 12 - Prob. 12.33HWCh. 12 - Prob. 12.34HWCh. 12 - Prob. 12.35HWCh. 12 - Prob. 12.36HWCh. 12 - Prob. 12.37HWCh. 12 - Prob. 12.38HWCh. 12 - Prob. 12.39HW
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
Write a program that reads in a weight in pounds and ounces and outputs the equivalent weight in kilograms and ...
Problem Solving with C++ (10th Edition)
Write an accessor method called getName that returns the value of a field called name, whose type is String.
Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
Determine the duty cycle of the waveform in Figure 1-61
Digital Fundamentals (11th Edition)
3.12 (Date Create a class called Date that includes three pieces Of information as data
members—a month (type ...
C++ How to Program (10th Edition)
Array bounds checking happens. a. when the program is compiled b. when the program is saved c. when the program...
Starting Out with Java: From Control Structures through Objects (6th Edition)
Describe a method that can be used to gather a piece of data such as the users age.
Web Development and Design Foundations with HTML5 (9th Edition) (What's New in Computer Science)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- Need help to implement networking in python Server.py Load data from file This option will ask the user for a fully qualified path and will load a JSON file containing the information for users and pending messages. The format of the JSON file will be defined based on your implementation and it will the same used to save the data into file (menu option #4). Functionalities the server must provide: 1) User Sign Up: adds a user identified by a phone number to the system. a) Protocol: USR|username|password|display_name b) Response: 0|OK for success. 1| for an error. c) The server should validate that the username does not exist 2) User Sign In: verify user credentials a) Protocol: LOG|username|password b) Response: i) 0|OK → the credentials are correct. ii) 1|Invalid Credentials iii) 2|Already Logged In → in case that the user is logged in from another client. c) This will help the server knowing which user is connected. d) The server should keep a list of connected clients, which should…arrow_forwardPROGRAM DESCRIPTION:In this assignment, you will write two complete C programs to support a client/server model using Linux sockets for a UDP “ping” utility, similar to the ping utility already available on our CSE machines. Servero The server program will be called with one command-line argument, the port number being used, such as ./minor4svr 8001. If the user calls the server program with too few or too many arguments, you will print out a usage statement and terminate the program.o The server will set up a UDP socket on the Internet (i.e., INET) domain and then wait in an infinite loop listening for incoming UDP packets, specifically PING messages from a client.o Packet LossUDP provides applications with an unreliable transport service. Messages may get lost in the network due to a variety of reasons. Since packet loss is rare or even non-existent in typical campus networks, the server in this lab will inject artificial loss to simulate the effects of network packet loss. The…arrow_forwardThis program can send the request to #include<stdio.h> #include<netinet/in.h> #include<sys/types.h> #include<sys/socket.h> int main() { int fd_client,fd, len; struct sockaddr_in add_server; fd_client = socket(AF_INET,SOCK_STREAM,0); if (fd_client == -1) { perror("fd_sock"); exit(1); } add_server.sin_family = AF_INET; add_server.sin_port = ntohs(4001); add_server.sin_addr.s_addr = inet_addr("193.39.0.4"); len = sizeof(add_server); fd = connect(fd_client,(struct sockaddr*)&add_server,len); if(fd == -1) perror("connect"); return 0; } a) the system having IP address 193.39.0.4 b) any system present in the network c) any system of the private network d) none of the mentionedarrow_forward
- Separate the server code and client code into two different programs, server.py and client.py. Execute the server program first and then execute the client program. You should still get the same set of print messages as in the combined threaded code in proj.py In the program provided, the server just sends a message string to the client after it connects. In this step you have to modify the server in two cases.1) Modify the server code so that when the client sends a string to the server, the server reverses the string before sending it back to the client. For example, if the client sends HELLO to the server, the client should receive OLLEH. Your client program should print the string sent by the client and the corresponding string received by the client from the server.2) Modify the server code so that when the client sends a string to the server, the server change all letters to upper case letters and sending it back to the client. For example, if the client sends hello to the…arrow_forwardTopic: Data Communication & Network Write a socket server program named "RockPaperScissorsServer", which communicates with players (clients). Server firstly receives a name for the player. Let’s assume 1 is Rock, 2 is Paper and 3 is Scissors. Next Server receives any of the 3 number from the user, generate a random number between 1 to 3 itself and then apply the Rock Paper Scissors game logic (which is paper beats rock, rock beats scissors, scissors beats paper), Then it will tell the player if the player or server has won. Write another client program to communicate with the server. Kindly make the server in such a way the any time any player can leave and another player can join. Use Java to write the code. *** Reference code: Creating a simple Server *** import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.ServerSocket; import java.net.Socket;import java.util.Scanner; public class Server1 {…arrow_forwardPLEASE USE MULTITHREADING IN THIS PROGRAM SO THAT MANY CLIENTS CONNECTED TO THE SERVER AND EACH CLIENT CAN SEND MESSAGE TO SERVER AND SERVER MESSAGE SHOWN TO ALL CLIENTS AND ONE CLIENT MESSAGE SHOWN TO ALL CLIENTS.PLEASE MAKE CHANGINGS IN THIS CODE. SERVER #include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <sys/socket.h>#include <sys/types.h>#include <netinet/in.h>#include <arpa/inet.h>#include <pthread.h>#define PORT 5500 void func(int connfd){ char buffer[1024]; int n; while(1) { bzero(buffer, 1024); read(connfd, buffer, sizeof(buffer)); printf("From client: %s\t To client : ", buffer); bzero(buffer, 1024); n = 0; while ((buffer[n++] = getchar()) != '\n'); write(connfd, buffer, sizeof(buffer)); if (strncmp("exit", buffer, 4) == 0){ printf("Server Exit...\n"); break; } }}int main(){ int sockfd, connfd, len; struct…arrow_forward
- Topic: Data Communication & Network Please provide (.java) file or or direct screenshots from your file as the code doesn't run in the other solutions that have been provided to me previously. Write a socket server program named "RockPaperScissorsServer", which communicates with players (clients). Server firstly receives a name for the player. Let’s assume 1 is Rock, 2 is Paper and 3 is Scissors. Next Server receives any of the 3 number from the user, generate a random number between 1 to 3 itself and then apply the Rock Paper Scissors game logic (which is paper beats rock, rock beats scissors, scissors beats paper), Then it will tell the player if the player or server has won. Write another client program to communicate with the server. Kindly make the server in such a way the any time any player can leave and another player can join. Use Java to write the code. *** Reference code: Create a simple Server *** import java.io.BufferedReader; import java.io.IOException; import…arrow_forwardn this assignment, you will develop a simple Web server in Python that is capableof processing only one request. Specifically, your Web server will(i) Create a connection socket when contacted by a client (browser)(ii) Receive the HTTP request from this connection(iii) Parse the request to determine the specific file being requested(iv) Get the requested file from the server’s file system(v) Create an HTTP response message consisting of the requested filepreceded by header lines(vi) Send the response over the TCP connection to the requesting browser.If a browser requests a file that is not present in your server, your server shouldreturn a “404 Not Found” error message.Your job is to code the steps above, run your server, and then test your server bysending requests from browsers running on different hosts. If you run your serveron a host that already has a Web server running on it, then you should use a differentport than port 80 for your Web server. Make sure to test your program…arrow_forwardWrite a client program and server program. The server uses a socket connection to allow a client to supply a filename and the server will send the file contents to the client or an error message if the file does not exist. The client will create a new file with the same contents. The client will supply the filename "input.txt" to the server and create as it's output "output.txt". Don't ask the user for these names or any questions at all. These files will be located in the top level folder of your project, just like in Eclipse Project 1. The Server sends whatever file the Client requests. Don't put "input.txt" in the Server code. The client must get the contents from the Server. It must not read input.txt directly. Do not accept arguments from the command line. This means that you are not permitted to get information to use from the args variable in the following code: public static void main(String[] args) { Do not use a path name when opening the files. This means the files should…arrow_forward
- Write a server and client programs that do the following based on the written pseudocode: Client Server Client create a socket that directed to port 3344, local host Server creates a server socket on port 3344 Server is capable to receive requests for more than one client at the same time.(threads) Client sends a linked list object to the server For each client , server creates a file named after containing n elements (size is given from user) generated randomly the threadID Server reads the list object and writes its content into the file created above Clients waits for the written confirmation from server , which is the number of elements found on the list object send above After writing, Server send number of elements written to the file to the client. Server closes sockets and files. Client check if number received is equal to the size of the list Client closes socketarrow_forwardPython socket programming Please do not copy and paste from previous Chegg answers Check server.py and client.py code and answer the questions below. # Client from socket import * s = socket(AF_INET, SOCK_DGRAM) host = '127.0.0.1' port = 1234 buf =1024 addr = (host,port) req = input("Enter the filename and the line number needed separated by comma: \n") #Example: req = 'book2.txt, 5' s.sendto(req.encode('ascii'), addr) print("Data requested.") data, addr = s.recvfrom(buf) print(data.decode()) s.close() # Server from socket import * host = '127.0.0.1' port = 1234 s = socket(AF_INET,SOCK_DGRAM) s.bind((host,port)) addr = (host,port) buf=1024 data,addr = s.recvfrom(buf) data = data.decode() data = data.split(',') f = open(data[0],'r') lines = f.readlines() index = int(data[1]) - 1 s.sendto(lines[index].encode('ascii'), addr) s.close() 1 - What modification(s) can you do to the code #1 and code #2 to make the server and client use the TCP Protocol? 2 - Modify…arrow_forwardThe ReadableByteChannel instance allows us to read from the Buffers in Datagram Socket using its rea method. Select one: a. True b. False A ByteBuffer receives data from the channel and the read method returns the number of String read Select one: a. True b. Falsearrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Database System ConceptsComputer ScienceISBN:9780078022159Author:Abraham Silberschatz Professor, Henry F. Korth, S. SudarshanPublisher:McGraw-Hill Education
Starting Out with Python (4th Edition)Computer ScienceISBN:9780134444321Author:Tony GaddisPublisher:PEARSON
Digital Fundamentals (11th Edition)Computer ScienceISBN:9780132737968Author:Thomas L. FloydPublisher:PEARSON
C How to Program (8th Edition)Computer ScienceISBN:9780133976892Author:Paul J. Deitel, Harvey DeitelPublisher:PEARSON
Database Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781337627900Author:Carlos Coronel, Steven MorrisPublisher:Cengage Learning
Programmable Logic ControllersComputer ScienceISBN:9780073373843Author:Frank D. PetruzellaPublisher:McGraw-Hill Education
Database System Concepts
Computer Science
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:McGraw-Hill Education
Starting Out with Python (4th Edition)
Computer Science
ISBN:9780134444321
Author:Tony Gaddis
Publisher:PEARSON
Digital Fundamentals (11th Edition)
Computer Science
ISBN:9780132737968
Author:Thomas L. Floyd
Publisher:PEARSON
C How to Program (8th Edition)
Computer Science
ISBN:9780133976892
Author:Paul J. Deitel, Harvey Deitel
Publisher:PEARSON
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781337627900
Author:Carlos Coronel, Steven Morris
Publisher:Cengage Learning
Programmable Logic Controllers
Computer Science
ISBN:9780073373843
Author:Frank D. Petruzella
Publisher:McGraw-Hill Education
Linux - Tutorial for Beginners in 13 MINUTES! [ UPDATED ]; Author: bai;https://www.youtube.com/watch?v=BMGixkvJ-6w;License: Standard YouTube License, CC-BY
What is Linux?; Author: Techquickie;https://www.youtube.com/watch?v=zA3vmx0GaO8;License: Standard YouTube License, CC-BY
Introduction to Linux and Basic Linux Commands for Beginners; Author: sakitech;https://www.youtube.com/watch?v=IVquJh3DXUA;License: Standard Youtube License