256 Project One

Part I

Reads data from the kernel and prints it in an informative format.

Usage

• Run make
• Execute ./proc_parse [read_rate] [print_rate]
  • read_rate specifies how frequently (in seconds) that data is read from the kernel and averaged
  • print_rate specifies how frequently (in seconds) that the averages are printed to stdout

Requirements

• In this part, you are asked to write a program to report the behavior of the Linux kernel. Your program should run in two different versions

• Version One:

  • Prints to stdout
    • Processor type
      • Parsed from /proc/cpuinfo
    • Kernel version
      • Parsed from /proc/version
    • Amount of configured memory
      • Parsed from /proc/meminfo
    • Uptime
      • Parsed from /proc/uptime

• Version Two:

  • Prints continuously based on print_rate
    • The percentage of time the processor(s) spend in user mode, system mode, and the percentage of time the processor(s) are idle
      • Parsed from /proc/stat
    • The amount and percentage of available (or free) memory
      • Parsed from /proc/meminfo
    • The rate (number of sectors per second) of disk read/write in the system
      • Parsed from /proc/diskstats/
    • The rate (number per second) of context switches in the kernel
      • Parsed from /proc/stat
    • The rate (number per second) of process creations in the system
      • Parsed from /proc/loadavg

Part 2

Implements a very primitive shell that knows how to launch new programs in the foreground and the background as well as recognizes several internal commands

Usage

• Run make
• ./shell to launch shell

Requirements

• Recognizes the following internal commands

  • exit

    • Uses system call exit()

  • jobs

    • Custom naive job database

  • cd

    • Uses system call chdir()

  • fg*

  • bg*

    * Not yet implemented

• Run programs
  • ./program [arg1][arg2]...[argN] supported