Assignment 1

CS476/576

Assignment #3

Due Midnight, Wednsday Oct 27, 2004

Write a C/UNIX program with the following descriptions:

NAME

pchain - A program that creates a chain of processes.

SYNOPSIS

pchain n

DESCRIPTION

<>The program creates n processes, process i creates process i+1, for i=1, 2, ...n-1.
<>The first process creates a unique temporary file T with name /tmp/pchainXXXXXX.
<>Each process writes its own pid in T.
<>The last process displays the content of T and then exits.
<>When a prcess detects the death of its child, it displays the content T and then exits.
<>The first process deletes T before it exits.
<>All process should access file T through its shared fd.

Program output

Upon the creation of process i, the program displays the message:

Process i is created: PID=<pid1>, ParentPID=<pid2>, ChildPID=<pid3>

where <pid1>, <pid2> and <pid3> are processes ids.

Upon the termination of process i, the program displays following:

Process i is terminated and the list of process is:
.....list all processes......