Move problem 1-2 (join) into project 2 as the "wait" system call.
[pintos-anon] / grading / userprog / wait-bad-pid.exp
1 (wait-bad-pid) begin
2 (wait-bad-pid) end
3 wait-bad-pid: exit(0)
4 --OR--
5 (wait-bad-pid) begin
6 wait-bad-pid: exit(-1)