C++ (Cpp) ProcessLaunchInfo::GetListener示例

// For local debugging, NetBSD will override the debug logic to use llgs-launch
// rather than lldb-launch, llgs-attach.  This differs from current lldb-
// launch, debugserver-attach approach on MacOSX.
lldb::ProcessSP
PlatformNetBSD::DebugProcess(ProcessLaunchInfo &launch_info, Debugger &debugger,
                             Target *target, // Can be NULL, if NULL create a new
                                             // target, else use existing one
                             Status &error) {
  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PLATFORM));
  LLDB_LOG(log, "target {0}", target);

  // If we're a remote host, use standard behavior from parent class.
  if (!IsHost())
    return PlatformPOSIX::DebugProcess(launch_info, debugger, target, error);

  //
  // For local debugging, we'll insist on having ProcessGDBRemote create the
  // process.
  //

  ProcessSP process_sp;

  // Make sure we stop at the entry point
  launch_info.GetFlags().Set(eLaunchFlagDebug);

  // We always launch the process we are going to debug in a separate process
  // group, since then we can handle ^C interrupts ourselves w/o having to
  // worry about the target getting them as well.
  launch_info.SetLaunchInSeparateProcessGroup(true);

  // Ensure we have a target.
  if (target == nullptr) {
    LLDB_LOG(log, "creating new target");
    TargetSP new_target_sp;
    error = debugger.GetTargetList().CreateTarget(
        debugger, "", "", eLoadDependentsNo, nullptr, new_target_sp);
    if (error.Fail()) {
      LLDB_LOG(log, "failed to create new target: {0}", error);
      return process_sp;
    }

    target = new_target_sp.get();
    if (!target) {
      error.SetErrorString("CreateTarget() returned nullptr");
      LLDB_LOG(log, "error: {0}", error);
      return process_sp;
    }
  }

  // Mark target as currently selected target.
  debugger.GetTargetList().SetSelectedTarget(target);

  // Now create the gdb-remote process.
  LLDB_LOG(log, "having target create process with gdb-remote plugin");
  process_sp =
      target->CreateProcess(launch_info.GetListener(), "gdb-remote", nullptr);

  if (!process_sp) {
    error.SetErrorString("CreateProcess() failed for gdb-remote process");
    LLDB_LOG(log, "error: {0}", error);
    return process_sp;
  }

  LLDB_LOG(log, "successfully created process");
  // Adjust launch for a hijacker.
  ListenerSP listener_sp;
  if (!launch_info.GetHijackListener()) {
    LLDB_LOG(log, "setting up hijacker");
    listener_sp =
        Listener::MakeListener("lldb.PlatformNetBSD.DebugProcess.hijack");
    launch_info.SetHijackListener(listener_sp);
    process_sp->HijackProcessEvents(listener_sp);
  }

  // Log file actions.
  if (log) {
    LLDB_LOG(log, "launching process with the following file actions:");
    StreamString stream;
    size_t i = 0;
    const FileAction *file_action;
    while ((file_action = launch_info.GetFileActionAtIndex(i++)) != nullptr) {
      file_action->Dump(stream);
      LLDB_LOG(log, "{0}", stream.GetData());
      stream.Clear();
    }
  }

  // Do the launch.
  error = process_sp->Launch(launch_info);
  if (error.Success()) {
    // Handle the hijacking of process events.
    if (listener_sp) {
      const StateType state = process_sp->WaitForProcessToStop(
          llvm::None, NULL, false, listener_sp);

      LLDB_LOG(log, "pid {0} state {0}", process_sp->GetID(), state);
    }

    // Hook up process PTY if we have one (which we should for local debugging
    // with llgs).
    int pty_fd = launch_info.GetPTY().ReleaseMasterFileDescriptor();
    if (pty_fd != PseudoTerminal::invalid_fd) {
      process_sp->SetSTDIOFileDescriptor(pty_fd);
      LLDB_LOG(log, "hooked up STDIO pty to process");
    } else
      LLDB_LOG(log, "not using process STDIO pty");
  } else {
    LLDB_LOG(log, "process launch failed: {0}", error);
    // FIXME figure out appropriate cleanup here.  Do we delete the target? Do
    // we delete the process?  Does our caller do that?
  }

  return process_sp;
}