CS476/576

Assignment #3

Due Midnight, Wednesday   October 25, 2006

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Write a C/UNIX program with the following descriptions:

NAME

coread  -   Concurrent Readers.

SYNOPSIS

coread <n> <InputFile>

DESCRIPTION

The program creates n children processes and all are connected to the parent with a single pipe.

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:

Ø reads 128 characters from InputFile and terminates if there is no more data to read.

Ø use the pipe to send the PID followed by the data that have been read.

v The parent reads from the pipe and produces two files: RecievedFile and PIDCounts:

Ø The ReceivedFile should be identical to the InputFile and

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

Example:

% coread 10 InputFile

% cat PIDReport

12 3431

12 3437

12 3439

13 3433

13 3434

14 3430

14 3435

14 3436

15 3438

16 3432