Project translated automatically. Log in or register, to view the original - You need to write two programs that will communicate with the help of sockets.One program is a server, the second is a client application. The server is a demon, which after launch must be cut off from the terminal from which it was launched.The server program is required to run with one of two options: 1 .-p port which will lead to the fact that the server will start working in the background mode by listening to the connections of customers on the port on all available interfaces.Only one instance of our server can work simultaneously in the system, the attempt to restart it must be signaled by the right message.2nd-q which will lead to the fact that it will be checked whether the instance server works relevantly in the system, and if it is true, the instance will be closed.The client application (user program) is launched with the mandatory four parameters [ -a addres_ip, -p port, -s string, -o operation ] that show.What server we want to connect to and what the server should do for us.After connecting to the server, the client sends him a string sign chain and the operation to perform the operation.Permited operations are tolower, toupper and invert.The server responds to the customer accordingly with the request received by sending the modified sign chain back (all letters must be reduced, increased or recorded in the opposite order) After receiving the answer, the client removes the answer to the screen and ends his work. - It is necessary to take into account the possibility of the occurrence of errors and, accordingly, not to respond to them (e.g. attempt to send a response to the customer who finished the work) In the server you need to use the multiplexing mechanism.The program code must be written with comments and the work algorithm is explained. The program must be written on a clean C using standard libraries.

Update #1 from 3 September 2020

Данное задание представляет из себя два маленьких скрипта, один из которых выполняет роль простого сервера, который выполняет одну из трёх запрашиваемых функций и отправляет ответ. Второй же - клиент, который после запуска отправляет запрос на сервер, ждёт ответ, после получения - закрывается. Все исполняется на локальной машине, и при проверке задания не будет выходить за рамки локальной сети, соответственно реализация серьезных сетевых протоколов не является необходимой.

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