llvm-project/lldb/source/Utility/KQueue.h

//===--------------------- KQueue.h -----------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef utility_KQueue_h_
#define utility_KQueue_h_

#if defined(__APPLE__)
#define LLDB_USE_KQUEUES
#endif

#ifdef LLDB_USE_KQUEUES

#include <sys/event.h>
#include <sys/time.h>
#include <sys/types.h>

#include "lldb/lldb-defines.h"

namespace lldb_private {

class KQueue {
public:
  KQueue() : m_fd(-1) {}

  ~KQueue() { Close(); }

  bool IsValid() const { return m_fd >= 0; }

  int GetFD(bool can_create);

  int Close();

  bool AddFDEvent(int fd, bool read, bool write, bool vnode);

  int WaitForEvents(
      struct kevent *events, int num_events, Error &error,
      uint32_t timeout_usec = UINT32_MAX); // UINT32_MAX means infinite timeout

protected:
  int m_fd; // The kqueue fd
};

} // namespace lldb_private

#endif // #ifdef LLDB_USE_KQUEUES

#endif // #ifndef utility_KQueue_h_