Operating Systems

Project 3: Kernel Timers

• Design and impliment facilities that use the real, virtual, and prof interval timers to profile a process.
  • Use the signal facility to determine when the timers have been decremented to zero and count the number of seconds and milliseconds that have elapsed.
  • Use the timers to report CPU time, time spent in kernel space, and time spent in user space
  • Write a subject program to spawn three children that recursivly compute the Fibonacci sequence for a large number. Then print a time report for each child along with the parent.
• Here are the files for my fibonacci time logger:
  • Driver Program - fiblogger.c
  • Real Timer - realtimer.c
  • Virtual Timer - virttimer.c
  • Prof Timer - proftimer.c

Project 2: Linux Shell Program

• Design a Linux shell using C that will run on top of BASH (Bourn Again Shell) to do the following:
  • Print a command prompt with the user's name and current directory
  • Read commands and arugments
  • Find and execute commands, search the PATH environment variable if necessary
  • Provide for background processing using the '&' argument
  • Allow input and output redirection using the '<', '>' and '>>' arguments
  • Allow for multiple piping of processes using the '|' command
  • Allow for piping and redirection at the same time
• Utilise the following system commands:
  • fork()
  • wait()
  • pipe()
  • chdir()
  • setenv()
  • getenv()
  • execv()
  • exevp()
• Here are the files from my final working version (Huyler Shell):
  • Linux executable: hsh
  • Main shell: hsh.c
  • Redirection functions: redirect.c
  • Piping functions: pipes.c

Project 1: Observing Linux Behavior

• Write a program to report the behavior of the linux kernel:
  • CPU type and model
  • Kernel version
  • Time since last boot
  • Time spent in user mode, system mode and idle
  • The number of disk requests made
  • The number of context switches the kernel has performed
  • The amount of memory configured and available
  • etc. . .
• Learn the basics of C programming in Linux:
  • The /proc file system
  • Using argc and argv
  • sys/time.h
  • stdio.h and stdlib.h
• Here are the files from my report program (kernel sample):
  • Linux executable: ksamp
  • Main program: ksamp.c
  • Short list additional functions: short.c
  • Long list additional functions: long.c