kqueue_monitor.hpp

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/*
 * Copyright (c) 2014-2021 Enrico M. Crisostomo
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 3, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef FSW_KQUEUE_MONITOR_H
#  define FSW_KQUEUE_MONITOR_H
 
#  include "monitor.hpp"
#  include <string>
#  include <vector>
#  include <filesystem>
#  include <sys/stat.h>
#  include <sys/event.h>
 
namespace fsw
{
  struct kqueue_monitor_load;

  class kqueue_monitor : public monitor
  {
  public:
    kqueue_monitor(std::vector<std::string> paths,
                   FSW_EVENT_CALLBACK *callback,
                   void *context = nullptr);

    ~kqueue_monitor() override;
 
  protected:
    void run() final;
 
  private:
    kqueue_monitor(const kqueue_monitor& orig) = delete;
    kqueue_monitor& operator=(const kqueue_monitor& that) = delete;
 
    void initialize_kqueue();
    void terminate_kqueue();
    void scan(const std::filesystem::path& path);
    bool add_watch(const std::string& path, const struct stat& fd_stat);
    bool is_path_watched(const std::string& path) const;
    void remove_deleted();
    void rescan_pending();
    void scan_root_paths();
    int wait_for_events(const std::vector<struct kevent>& changes,
                        std::vector<struct kevent>& event_list) const;
    void process_events(const std::vector<struct kevent>& event_list,
                        int event_num);
 
    int kq = -1;
    // initial load
    std::unique_ptr<kqueue_monitor_load> load;
  };
}
 
#endif  /* FSW_KQUEUE_MONITOR_H */