Assignment #4
Due Monday November 10, 1997
Use Motif interface/TCP sockets to implement the following program:
NAME
Survey : A simple survey tool
SYNOPSIS
survey [time] [host port]
DESCRIPTION
The teacher invokes the program with one argument [time] to control how long
(the number of minutes) the survey should last. In such case
the program behaves as a server and displays the following
message to the teacher's standard output:
let each student type: survey host port
where host is the IP address of the machine and port is the server port number.
In addition the program displays a motif interface similar to the teacher's
interface
of assignment #3 with the following modifications. Replace the count-down
counter
with count-up counter, indicating the number of students who have been
connected to the server. In addition, a time-left counter should be added to the interface
indicating the number of minutes remaining until no further votes are
accepted.
Note that the count-down does not start until the professor sends the survey
question.
The survey results are displayed to the professor interface as they arrive (like assignment #3).
However, only the final result of the survey is sent to all currently connected
students at the end of the survey (when the time-left reaches 0). This,
unlike assignment #3,
the students are not aware of the partial results of the survey, they can only
see the final result.
When a student types:
survey host port
the program behaves as a client and establishes a TCP connection
with the server (the teacher process).
Upon the successful establishment of the TCP connection,
the server sends to the client the number of minutes left until the end
of survey. The student interface is similar to the student's interface of
assignment #3, with only one modification: to add the time-left counter.
When the time-left counter reaches 0, the student is not allowed to vote and
the result of the survey is displayed (the result includes:
the total number of students
who have been connected to the teacher during the survey time,
the number of YES votes and the number of NO votes).
In this assignment, assume that the professor can not quit (i.e., disable the
Quit button)
until the end of the survey. However,
the students may quit at any time during they wish.
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