Lab 5. CS333. Autumn 2018

*  lab5.pdf describes the lab statement.

*  The directory 'test-programs' contains the test programs, 
   and the directory 'sample-outputs' contains the their sample 
   outputs.

*  Use the following commands to clean, compile, and run 
   the xv6 on qemu  
   
   make clean && make && make qemu

*  Implement all system calls in the file 'sysproc.c'. Supporting
   functions can be implemented in any other files.
