CORRECTNESS [[total]]
---------------------

Argument passing
  -5 args-argc: argc is not set correctly
  -5 args-argv0: executable name not passed as argv[0]
  -5 args-multiple: passing multiple arguments fails
  -5 args-dblspace: using multiple spaces between arguments fails

System calls: halt, exec 
  -1 halt: halt system call fails
  -2 exit: exit system call malfunctions
Score: /3

System calls: create
  -2 create-normal: create a file in the most normal way
  -1 create-empty: pass empty string to create system call
  -1 create-null: pass null pointer to create system call
  -1 create-bad-ptr: pass invalid pointer to create system call
  -1 create-long: pass long file name to create system call
  -1 create-exists: pass name of an existing file to create system call
Score: /7

System calls: open
  -2 open-normal: open a file in the most normal way
  -2 open-missing: try to open a file that doesn't exist
  -1 open-empty: pass empty string to open system call
  -1 open-null: pass null pointer to open system call
  -1 open-twice: open the same file twice
Score: /7

System calls: close
  -2 close-normal: close an open file in the most normal way
  -2 close-twice: try to close an open file twice
  -1 close-stdin: try to close stdin
  -1 close-stdout: try to close stdout
  -1 close-bad-fd: try to close invalid file descriptor
Score: /7

System calls: read
  -2 read-normal: read from open file in most normal way
  -2 read-bad-ptr: pass invalid pointer to read system call
  -1 read-zero: try to read zero bytes
  -1 read-stdout: try to read from stdout
  -1 read-bad-fd: try to read from invalid file descriptor
Score: /7

System calls: write
  -2 write-normal: write to open file in most normal way
  -2 write-bad-ptr: pass invalid pointer to write system call
  -1 write-zero: try to write zero bytes
  -1 write-stdin: try to write to stdin
  -1 write-bad-fd: try to write to invalid file descriptor
Score: /7

System calls: exec
  -2 exec-once: call exec/join once
  -2 exec-multiple: call exec/join multiple times
  -2 exec-missing: exec of nonexistent file must return -1
  -1 exec-bad-ptr: pass invalid pointer to exec system call
Score: /7

System calls: join
  -2 join-simple: join must return proper value
  -2 join-twice: join a subprocess two times
  -2 join-killed: join must return -1 if subprocess killed by kernel
  -1 join-bad-pid: join must return if passed bad pid
Score: /7

Multiprogramming
  -

3. Multiprogramming / Page boundary checking (/50 points)
        Multiprogramming: Exec'ing two simple programs                  -30 
                          from another program doesn't work
        Open/Create fails on page boundary                              -5
        Read/Write fails on page boundary                               -5
        Can close file opened by parent                                 -5
        Running out of physical memory crashes OS                       -5
        Shell test doesn't work with normal page size                   -5 
        Shell test doesn't work with smaller page size                  -5
        Exec/Join tests 0 and 1 fail when we substitute a new 
        bitmap.cc that returns pages in a random order.                 -5 

-----------
Notes on the shell tests :

Large page size echo/matmult test
  -5 if nothing works no matter what you do
  -4 if shell works in either case but matmult doesn't work in either case

Small page size echo/matmult test
  -5 if nothing works no matter what you do
  -4 if shell works in either case but matmult doesn't work in either case
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