CS 3733 Operating Systems, Fall 2008 Recitation Session 1

Wednesday, September 3
The purpose of this session is to make you familiar with the Lab environment.

• Log on to your Linux account.
• Set up the windowing environment to your liking.
• Make sure you have a cs3733 directory somewhere in your account.
• Create a Rec01 subdirectory.
• Access the USP web site: /usp
• Click on the Programs link.
• Download the (uncompressed) tar file for chapter 5.
• Untar the files into your Rec01 directory.
• Run the convertlinux script to modify the makefile.
• Compile all of the programs from Chapter 5 of USP by executing make.
• Execute the program
  
  printaccesstest .
  
  This should show the access time for the files in this directory.
• Read pages 154 and 155 of USP starting with section 5.2.1.
  You can find these pages online here.
  Find the description of st_size in struct stat.
• Copy printaccess.c into get_filesize.c.
  Modify get_filesize.c so that the name of the function is get_filesize.
  Instead of printing information, this function will return an int which is the st_size field of the structure, cast to an int.
  The function does not perform any I/O.
  If the call to stat fails, the function returns -1.
  You should be able to remove both time.h and stdio.h from the includes.
• Get a copy of the program test_get_filesize.c that is available here to test your function.
  Modify the makefile to compile test_get_filesize.c and get_filesize.c to produce the executable test_get_filesize.
  Run this as follows:
  
  test_get_filesize makefile
  and convince yourself that it is working correctly.
• Make sure the TA checks off that you completed this.