TDC 368: Unix and Network Programming, Winter 09

Assignment 2: Unix Signals

Due: 4:30pm February 5, 2009

Assignment Description

Write a C/C++ program (P) that forks another child (C) program, prints its own PID and the Child PID, open a file given in the command-line argument, write a line in the file (“I AM THE PARENT\n”), closes the file, sends SIGUSR1 to C, and then P waits until C sends a SIGUSR1. Once the C program starts, it waits for SIGUSR1 signal. Upon receiving this signal, C program prints its own PID and the parent (P) PID, open the same file, write one line into the file (\223I am the Child\n\224), closes the file, and then C sends SIGUSR1 to P and goes back to wait for SIGUSR1 from P. This alternate writes in the file continues till the user hit Ctr-C three times which causes both programs to terminate. The program will be executed as follows:

CoordWrite <FileName>

Submission Procedure:

Write your name and SSN in the main program and in the README file. After cleaning your directory from objects and bin files, do the following: (Your submission must contain a Makefile and a README file that describes how to run your program). Then USE the same naming convention and command line arguments as specified in the assignment description.

$ tar -cvf <HawkLogin>-<SSNLast4>-hw2.tar *

$gzip <HawkLogin>-<SSNLast4>-hw2.tar

DO NOT for get to take out any binary or object files in your submission

Then submit it in DLWEB .

Grading Policy

Late penalty is 10% per day.