System calls: exec
-2 exec-once: call exec/join once
+ -2 exec-arg: check command-line passing on exec
-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
+Score: /9
System calls: join
-2 join-simple: join must return proper value