ppid              431 usertests.c      int pid, ppid;
ppid              434 usertests.c      ppid = getpid();
ppid              449 usertests.c          kill(ppid);
ppid             1417 usertests.c      int fds[2], pid, pids[10], ppid;
ppid             1498 usertests.c        ppid = getpid();
ppid             1506 usertests.c          kill(ppid);