//------------------------------------------------------------------------------
/// The basic design of the ProcessMonitor is built around two threads.
///
/// One thread (@see SignalThread) simply blocks on a call to waitpid() looking
/// for changes in the debugee state.  When a change is detected a
/// ProcessMessage is sent to the associated ProcessFreeBSD instance.  This thread
/// "drives" state changes in the debugger.
///
/// The second thread (@see OperationThread) is responsible for two things 1)
/// launching or attaching to the inferior process, and then 2) servicing
/// operations such as register reads/writes, stepping, etc.  See the comments
/// on the Operation class for more info as to why this is needed.
ProcessMonitor::ProcessMonitor(ProcessPOSIX *process,
                               Module *module,
                               const char *argv[],
                               const char *envp[],
                               const FileSpec &stdin_file_spec,
                               const FileSpec &stdout_file_spec,
                               const FileSpec &stderr_file_spec,
                               const FileSpec &working_dir,
                               const lldb_private::ProcessLaunchInfo & /* launch_info */,
                               lldb_private::Error &error)
    : m_process(static_cast<ProcessFreeBSD *>(process)),
      m_pid(LLDB_INVALID_PROCESS_ID),
      m_terminal_fd(-1),
      m_operation(0)
{
    std::unique_ptr<LaunchArgs> args(new LaunchArgs(this, module, argv, envp,
                                                    stdin_file_spec,
                                                    stdout_file_spec,
                                                    stderr_file_spec,
                                                    working_dir));
    

    sem_init(&m_operation_pending, 0, 0);
    sem_init(&m_operation_done, 0, 0);

    StartLaunchOpThread(args.get(), error);
    if (!error.Success())
        return;

WAIT_AGAIN:
    // Wait for the operation thread to initialize.
    if (sem_wait(&args->m_semaphore))
    {
        if (errno == EINTR)
            goto WAIT_AGAIN;
        else
        {
            error.SetErrorToErrno();
            return;
        }
    }

    // Check that the launch was a success.
    if (!args->m_error.Success())
    {
        StopOpThread();
        error = args->m_error;
        return;
    }

    // Finally, start monitoring the child process for change in state.
    m_monitor_thread = Host::StartMonitoringChildProcess(
        ProcessMonitor::MonitorCallback, this, GetPID(), true);
    if (!m_monitor_thread.IsJoinable())
    {
        error.SetErrorToGenericError();
        error.SetErrorString("Process launch failed.");
        return;
    }
}
예제 #2
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ProcessMonitor::ProcessMonitor(ProcessPOSIX *process,
                               lldb::pid_t pid,
                               lldb_private::Error &error)
    : m_process(static_cast<ProcessFreeBSD *>(process)),
      m_operation_thread(LLDB_INVALID_HOST_THREAD),
      m_monitor_thread(LLDB_INVALID_HOST_THREAD),
      m_pid(pid),
      m_server_mutex(Mutex::eMutexTypeRecursive),
      m_terminal_fd(-1),
      m_client_fd(-1),
      m_server_fd(-1)
{
    std::auto_ptr<AttachArgs> args;

    args.reset(new AttachArgs(this, pid));

    // Server/client descriptors.
    if (!EnableIPC())
    {
        error.SetErrorToGenericError();
        error.SetErrorString("Monitor failed to initialize.");
    }

    StartAttachOpThread(args.get(), error);
    if (!error.Success())
        return;

WAIT_AGAIN:
    // Wait for the operation thread to initialize.
    if (sem_wait(&args->m_semaphore))
    {
        if (errno == EINTR)
            goto WAIT_AGAIN;
        else
        {
            error.SetErrorToErrno();
            return;
        }
    }

    // Check that the launch was a success.
    if (!args->m_error.Success())
    {
        StopAttachOpThread();
        error = args->m_error;
        return;
    }

    // Finally, start monitoring the child process for change in state.
    m_monitor_thread = Host::StartMonitoringChildProcess(
        ProcessMonitor::MonitorCallback, this, GetPID(), true);
    if (!IS_VALID_LLDB_HOST_THREAD(m_monitor_thread))
    {
        error.SetErrorToGenericError();
        error.SetErrorString("Process attach failed.");
        return;
    }
}
예제 #3
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ProcessMonitor::ProcessMonitor(ProcessPOSIX *process,
                               lldb::pid_t pid,
                               lldb_private::Error &error)
    : m_process(static_cast<ProcessFreeBSD *>(process)),
      m_operation_thread(LLDB_INVALID_HOST_THREAD),
      m_monitor_thread(LLDB_INVALID_HOST_THREAD),
      m_pid(pid),
      m_terminal_fd(-1),
      m_operation(0)
{
    sem_init(&m_operation_pending, 0, 0);
    sem_init(&m_operation_done, 0, 0);


    std::unique_ptr<AttachArgs> args(new AttachArgs(this, pid));

    StartAttachOpThread(args.get(), error);
    if (!error.Success())
        return;

WAIT_AGAIN:
    // Wait for the operation thread to initialize.
    if (sem_wait(&args->m_semaphore))
    {
        if (errno == EINTR)
            goto WAIT_AGAIN;
        else
        {
            error.SetErrorToErrno();
            return;
        }
    }

    // Check that the attach was a success.
    if (!args->m_error.Success())
    {
        StopOpThread();
        error = args->m_error;
        return;
    }

    // Finally, start monitoring the child process for change in state.
    m_monitor_thread = Host::StartMonitoringChildProcess(
        ProcessMonitor::MonitorCallback, this, GetPID(), true);
    if (!IS_VALID_LLDB_HOST_THREAD(m_monitor_thread))
    {
        error.SetErrorToGenericError();
        error.SetErrorString("Process attach failed.");
        return;
    }
}