None of the tests should crash the system. If you kill processes when system calls fail with EFAULT (a valid thing to do) badcall itself may get killed. Otherwise, badcall should not get killed either.
Tests may be selected on the command line; if so, all the tests selected on the command line will be run in order. If nothing is selected on the command line, a menu is printed and tests are prompted for.
The tests for the individual syscalls are specified with the letters `a' through `y'. The numbers 1-4 may also be specified, to test all the system calls that are supposed to work as of the time assignments 1 through 4 (respectively) are complete. `*' may be used to test everything. Use `!' to quit.
At the completion of each assignment, the system should pass the tests for the syscalls associated with that (and previous) assignments. At no time should anything badcall does crash the system.