Esempio n. 1
0
// waitStatusToStateUpdate converts syscall.WaitStatus to a StateUpdate.
func waitStatusToStateUpdate(ws syscall.WaitStatus) *stateUpdate {
	switch {
	case ws.Exited():
		es := ws.ExitStatus()
		if es == 0 {
			return newExitedStateUpdate(ok)
		}
		return newExitedStateUpdate(newFailure(fmt.Sprint(es)))
	case ws.Signaled():
		msg := fmt.Sprintf("signaled %v", ws.Signal())
		if ws.CoreDump() {
			msg += " (core dumped)"
		}
		return newUnexitedStateUpdate(msg)
	case ws.Stopped():
		msg := fmt.Sprintf("stopped %v", ws.StopSignal())
		trap := ws.TrapCause()
		if trap != -1 {
			msg += fmt.Sprintf(" (trapped %v)", trap)
		}
		return newUnexitedStateUpdate(msg)
	case ws.Continued():
		return newUnexitedStateUpdate("continued")
	default:
		return newUnexitedStateUpdate(fmt.Sprint("unknown status", ws))
	}
}
Esempio n. 2
0
func printStatus(ws syscall.WaitStatus) string {
	switch {
	case ws.Exited():
		es := ws.ExitStatus()
		if es == 0 {
			return ""
		}
		return fmt.Sprintf("exited %v", es)
	case ws.Signaled():
		msg := fmt.Sprintf("signaled %v", ws.Signal())
		if ws.CoreDump() {
			msg += " (core dumped)"
		}
		return msg
	case ws.Stopped():
		msg := fmt.Sprintf("stopped %v", ws.StopSignal())
		trap := ws.TrapCause()
		if trap != -1 {
			msg += fmt.Sprintf(" (trapped %v)", trap)
		}
		return msg
	case ws.Continued():
		return "continued"
	default:
		return fmt.Sprintf("unknown status %v", ws)
	}
}
Esempio n. 3
0
// waitStatusToError converts syscall.WaitStatus to an Error.
func waitStatusToError(ws syscall.WaitStatus) error {
	switch {
	case ws.Exited():
		es := ws.ExitStatus()
		if es == 0 {
			return nil
		}
		return errors.New(fmt.Sprint(es))
	case ws.Signaled():
		msg := fmt.Sprintf("signaled %v", ws.Signal())
		if ws.CoreDump() {
			msg += " (core dumped)"
		}
		return errors.New(msg)
	case ws.Stopped():
		msg := fmt.Sprintf("stopped %v", ws.StopSignal())
		trap := ws.TrapCause()
		if trap != -1 {
			msg += fmt.Sprintf(" (trapped %v)", trap)
		}
		return errors.New(msg)
	/*
		case ws.Continued():
			return newUnexitedStateUpdate("continued")
	*/
	default:
		return fmt.Errorf("unknown WaitStatus", ws)
	}
}
Esempio n. 4
0
func (t *PTracer) handleStopped(pid int, status syscall.WaitStatus) {
	signal := syscall.Signal(0)
	target, err := t.thread(pid)
	if err != nil {
		log.Printf("thread failed: %v", err)
		return
	}

	if !target.attached {
		target.attached = true

		err = syscall.PtraceSetOptions(pid, ptraceOptions)
		if err != nil {
			log.Printf("SetOptions failed, pid=%d, err=%v", pid, err)
			return
		}

	} else if status.Stopped() && status.StopSignal() == syscall.SIGTRAP|ptraceTracesysgoodBit {
		// pid entered Syscall-enter-stop or syscall-exit-stop
		target.syscallStopped()

	} else if status.Stopped() && status.StopSignal() == syscall.SIGTRAP {
		// pid entered PTRACE_EVENT stop
		switch status.TrapCause() {
		case syscall.PTRACE_EVENT_CLONE:
			err := target.handleClone(pid)
			if err != nil {
				log.Printf("clone failed: %v", err)
				return
			}
		default:
			log.Printf("Unknown PTRACE_EVENT %d for pid %d", status.TrapCause(), pid)
		}
	} else if status.Exited() || status.Signaled() {
		// "tracer can safely assume pid will exit"
		t.threadExited(target)
		return
	} else if status.Stopped() {
		// tracee received a non-trace related signal
		signal = status.StopSignal()

		if signal == syscall.SIGSTOP && target.process.detaching {
			t.detachThread(target)
			return
		}
	} else {
		// unknown stop - shouldn't happen!
		log.Printf("Pid %d random stop with status %x", pid, status)
	}

	// Restart stopped caller in syscall trap mode.
	// log.Printf("Restarting pid %d with signal %d", pid, int(signal))
	err = syscall.PtraceSyscall(pid, int(signal))
	if err != nil {
		log.Printf("PtraceSyscall failed, pid=%d, err=%v", pid, err)
	}
}