CS476/576

Assignment #4

Due Midnight, Wednesday  November 8, 2006

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Write a C/Sockets program with the following descriptions:

NAME

coreadServer  -   Concurrent Readers Server.

coreadClient  -   Concurrent Readers Client.

SYNOPSIS

coreadServer <OutputFile>

coreadClient <n> <InputFile> <RemoteHost> <Port>

DESCRIPTION

Ø The coreadClient program creates n children processes communicating with the parent using udp sockets.

v Each process  i, i= 1, 2,.., n do the following:

Sleeps a random amount of time T, where T <= n seconds and when it wakes up it:

· Reads 128 characters from InputFile & terminates if there is no more data to read.

· Use the udp socket to send the PID followed by the data that have been read.

v The parent reads from its udp socket and sends the received packets to the coreadServer using its tcp socket.

Ø The coreadServer program displays its port number, reads from its tcp socket and produces two files:

§ The OutputFile should be identical to the InputFile and

§ The PIDCounts contains the number of reads performed by each child process.

§

Example:

% coreadServer OutputFile

coreadServer Port#: 61634

running at host: ra.cs.odu.edu (128.82.4.116 )

acceped coreadClient connection

from: 128.82.4.116:61643 (ra.cs.odu.edu)

% coreadClient 20 InputFile ra 61634

% cat PIDReport

4 24408

5 24392

5 24398

5 24403

5 24411

6 24397

6 24401

6 24405

6 24415

6 24417

7 24396

7 24407

7 24409

7 24414

8 24393

8 24394

8 24406

8 24416

9 24399

10 24395