12451e6b06
o Don't call vm_willexit() more than once upon normal process exit o Correct two cases of indenting of the no-discussion-possible kind o Perform slightly stricter ptrace(2) checks: - process calling ptrace must be target process's parent - process must call wait/waitpid before using ptrace on stopped child - no ptrace on zombies o Allow user processes to use ptrace(T_STOP) to stop an active child