CS779/879

Assignment #3

Due Midnight, Wednesday March 28, 2012

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Implement the following program:

NAME

EMTC - Enhanced Multicast TCP Chat

SYNOPSIS

EMTC <multicast-address> <port-number> < s | t | f >

DESCRIPTION

This is an Enhanced/Exteded implementation of assignment 1

The program creates:

ü A UDP socket U:

The socket joins the multicast group G defined by the two arguments:

<multicast-address> <port-number>

e.g., 224.0.0.1 10123

ü A server TCP socket T:

The socket is binded to <port-number>

It accepts TCP clients at sockets C1, C2, ....

Any message received from any TCP client C1, C2, .... is sent as a multicast message out of U.

Any multicast message (and not a unicast) received at U is sent to all currently connected clients C1, C2, ...

ü The program implements its function based on the following options:

s : use select

t : use threads

f : use fork & shared memory.

ü You may test the my implementation at:

http://www.cs.odu.edu/~cs779/spring12/assignments/a3/wahab/

To test EMTC you may use:

http://www.cs.odu.edu/~cs779/mcastChat/mcastChat.c

http://www.cs.odu.edu/~cs779/sock/

Example:

% EMTC 224.0.0.1 10123 f (or t or s)
% mcastChat 224.0.0.1 10123

% sock 127.0.0.1 10123