deskflow/src/apps/deskflow-core/deskflow-core.cpp

/*
 * Deskflow -- mouse and keyboard sharing utility
 * SPDX-FileCopyrightText: (C) 2025 Chris Rizzitello <sithlord48@gmail.com>
 * SPDX-FileCopyrightText: (C) 2012 - 2016, 2025 - 2026 Symless Ltd.
 * SPDX-FileCopyrightText: (C) 2002 Chris Schoeneman
 * SPDX-License-Identifier: GPL-2.0-only WITH LicenseRef-OpenSSL-Exception
 */

#include "CoreArgParser.h"

#include "arch/Arch.h"
#include "base/EventQueue.h"
#include "base/Log.h"
#include "common/Constants.h"
#include "common/ExitCodes.h"
#include "deskflow/ClientApp.h"
#include "deskflow/ServerApp.h"
#include "deskflow/ipc/CoreIpcServer.h"

#if defined(Q_OS_WIN)
#include "arch/win32/ArchMiscWindows.h"
#endif

#include <QApplication>
#include <QFileInfo>
#include <QSharedMemory>
#include <QTextStream>
#include <QThread>

void showHelp(const CoreArgParser &parser)
{
  QTextStream(stdout) << parser.helpText();
}

App *createApp(const CoreArgParser &parser, EventQueue &events, const QString &processName)
{
  if (parser.serverMode()) {
    return new ServerApp(&events, processName);
  } else if (parser.clientMode()) {
    return new ClientApp(&events, processName);
  }
  return nullptr;
}

int main(int argc, char **argv)
{
#if defined(Q_OS_WIN)
  {
    // HACK to make sure settings gets the correct qApp path
    QCoreApplication m(argc, argv);
  }

  ArchMiscWindows::setInstanceWin32(GetModuleHandle(nullptr));
#endif

  Arch arch;
  arch.init();

  Log log;

  QStringList args;
  for (int i = 0; i < argc; i++)
    args.append(argv[i]);

  CoreArgParser parser(args);

  // Print any parser errors
  if (!parser.errorText().isEmpty()) {
    QTextStream(stdout) << parser.errorText() << "\n";
  }

  if (parser.help()) {
    showHelp(parser);
    return s_exitSuccess;
  }

  if (parser.version()) {
    QTextStream(stdout) << parser.versionText();
    return s_exitSuccess;
  }

  // Before we check any more args we need to check for a duplicate process.
  // Create a shared memory segment with a unique key
  // This is to prevent a new instance from running if one is already running
  QSharedMemory sharedMemory(kCoreBinName);

  // Attempt to attach first and detach in order to clean up stale shm chunks
  // This can happen if the previous instance was killed or crashed
  if (sharedMemory.attach())
    sharedMemory.detach();

  if (!sharedMemory.create(1) && parser.singleInstanceOnly()) {
    LOG_WARN("an instance of deskflow core is already running");
    return s_exitDuplicate;
  }

  parser.parse();

  EventQueue events;
  const auto processName = QFileInfo(argv[0]).fileName();

  App *coreApp = createApp(parser, events, processName);

  QApplication app(argc, argv);
  QApplication::setApplicationName(QStringLiteral("%1 Core").arg(kAppName));

  const auto ipcServer = new deskflow::core::ipc::CoreIpcServer(&app); // NOSONAR - Qt managed
  ipcServer->listen();

  QThread coreThread;
  QObject::connect(&coreThread, &QThread::finished, &app, &QApplication::quit);
  coreApp->run(coreThread);

  int exitCode = QApplication::exec();
  coreThread.wait();

  if (exitCode == s_exitSuccess) {
    exitCode = coreApp->getExitCode();
  }

  LOG_DEBUG("core exited, code: %d", exitCode);
  return exitCode;
}